Sunrise Communications (SNRE) 20-F 28 Feb 25 2024 FY Annual report (foreign) Financial data

COVER

COVER	12 Months Ended
	Dec. 31, 2024 shares
Document Information [Line Items]
Document Type	20-F
Document Registration Statement	false
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Document Shell Company Report	false
Entity File Number	001-42394
Registrant Name	Sunrise Communications AG
Entity Incorporation, State or Country Code	V8
Entity Address, Address Line One	Thurgauerstrasse 101b
Entity Address, Postal Zip Code	8152
Entity Address, City or Town	Glattpark (Opfikon)
Entity Address, Country	CH
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Document Accounting Standard	International Financial Reporting Standards
Entity Shell Company	false
Amendment Flag	false
Central Index Key	0002021938
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2024
Entity Voluntary Filers	No
Business Contact
Document Information [Line Items]
Contact Personnel Name	Marcel Huber
Entity Address, Address Line One	Thurgauerstrasse 101b
Entity Address, Postal Zip Code	8152
Entity Address, City or Town	Glattpark (Opfikon)
Entity Address, Country	CH
Country Region	41
Local Phone Number	58 777 76 66
American Depositary Shares
Document Information [Line Items]
Title of 12(b) Security	American Depositary Shares each representing one Class A common share, nominal value CHF 0.1 per share (Namenaktien)
Trading Symbol	SNRE
Security Exchange Name	NASDAQ
Ordinary shares
Document Information [Line Items]
Title of 12(b) Security	Class A common shares, nominal value CHF 0.1 per share (Namenaktien)
No Trading Symbol Flag	true
Security Exchange Name	NASDAQ
Class A Common Shares
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	69,759,702
Class B Shares with Privileged Voting Rights
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	25,977,316

AUDIT INFORMATION

AUDIT INFORMATION	12 Months Ended
	Dec. 31, 2024
Auditor [Abstract]
Auditor Firm ID	3240
Auditor Name	KPMG AG
Auditor Location	Zurich, Switzerland

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME OR LOSS - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement [Line Items]
Revenue	SFr 3,018	SFr 3,035.2	SFr 3,035.2
Direct costs	(830.1)	(834.6)	(819.6)
Personnel expenses	(407)	(416.7)	(438.3)
Other operating income and capitalized labor	68.1	105.7	61.7
Other operating expenses	(696.4)	(758.8)	(750.2)
Depreciation of right-of-use assets	(129.7)	(128)	(145.4)
Depreciation and amortization	(917.9)	(992.1)	(1,028.8)
Operating income (loss)	105	10.7	(85.4)
Financial income	257.7	574.7	456.7
Financial expenses	(742.6)	(957.2)	(340.2)
Share of gains (losses) of equity method investments	1.3	(0.3)	2.2
Income (loss) before taxes	(378.6)	(372.1)	33.3
Income tax benefit (expense)	16.7	59.9	50.7
Net income (loss)	(361.9)	(312.2)	84
Attributable to:
Sunrise Communications AG shareholders	(365.8)	(316.1)	80.5
Non-controlling interest	SFr 3.9	SFr 3.9	SFr 3.5
Class A Common Shares
Earnings (loss) per share
Basic earnings (loss) per share (in SFr per share)	SFr (5.1)	SFr (4.4)	SFr 1.1
Diluted earnings (loss) per share (in SFr per share)	(5.1)	(4.4)	1.1
Class B Common Shares
Earnings (loss) per share
Basic earnings (loss) per share (in SFr per share)	(0.5)	(0.4)	0.1
Diluted earnings (loss) per share (in SFr per share)	SFr (0.5)	SFr (0.4)	SFr 0.1

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME OR LOSS - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Profit or loss [abstract]
Net income (loss)	SFr (361.9)	SFr (312.2)	SFr 84
Items that are or may be reclassified to the statement of income or loss:
Foreign currency translation adjustments	(13.3)	(95)	(54.5)
Items that will not be reclassified to the statement of income or loss:
Pension-relation adjustments	(7.7)	(23)	9.3
Other comprehensive income (loss), net of taxes	(21)	(118)	(45.2)
Attributable to:
Sunrise Communications AG shareholders	(21)	(117.8)	(46.6)
Non-controlling interest	0	(0.2)	1.4
Total comprehensive income (loss), net of taxes	(382.9)	(430.2)	38.8
Attributable to:
Sunrise Communications AG shareholders	(386.8)	(433.9)	33.9
Non-controlling interest	SFr 3.9	SFr 3.7	SFr 4.9

CONSOLIDATED STATEMENTS OF FINA

CONSOLIDATED STATEMENTS OF FINANCIAL POSITION - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	SFr 351.8	SFr 4.8
Trade receivables	353	390.9
Current financial assets	162.5	237
Tax receivables	0	2.4
Other current assets	259.9	376
Total current assets	1,127.2	1,011.1
Non-current assets:
Property, plant and equipment	2,338.5	2,295.7
Goodwill	6,012.7	6,012.7
Intangible assets	1,084.4	1,529.9
Right-of-use assets	1,262.5	1,294.2
Financial assets	5.1	293.1
Investments	48.4	55.6
Deferred tax assets	23.6	0
Other non-current assets	160.4	116.4
Total non-current assets	10,935.6	11,597.6
Total assets	12,062.8	12,608.7
Current liabilities:
Accounts payable	316	281.4
Lease liabilities	164.1	170.4
Financial liabilities	586.7	550.2
Provisions	4.7	52.8
Tax liabilities	17.9	15.9
Other current liabilities	497	582.8
Total current liabilities	1,586.4	1,653.5
Non-current liabilities:
Lease liabilities	1,055.2	1,087.3
Financial liabilities	4,747.9	5,921.9
Provisions	64	64.1
Defined benefit obligations	8.4	8.4
Deferred tax liabilities	165.8	206.7
Other non-current liabilities	48.2	89.8
Total non-current liabilities	6,089.5	7,378.2
Total liabilities	7,675.9	9,031.7
Equity
Ordinary share capital	7.2	0
Treasury shares	(0.1)	0
Reserves	4,353.7	3,554.8
Equity attributable to the shareholders	4,360.8	3,554.8
Non-controlling interests	26.1	22.2
Total equity	4,386.9	3,577
Total liabilities and equity	SFr 12,062.8	SFr 12,608.7

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - CHF (SFr) SFr in Millions	Total	Total equity attributable to shareholders	Ordinary share capital	Treasury Stock	Other Reserves	Currency translation reserve	Actuarial gains/(losses) from defined benefit plans, net of taxes	Non-controlling interests
Equity at beginning of period at Dec. 31, 2021	SFr 3,059.8	SFr 3,041.6			SFr 3,118.4	SFr (100.8)	SFr 24	SFr 18.2
Net income (loss)	84	80.5			80.5			3.5
Other comprehensive income (loss), net of taxes	(45.2)	(46.6)				(54.5)	7.9	1.4
Total comprehensive income (loss), net of taxes	38.8	33.9			80.5	(54.5)	7.9	4.9
Share-based compensation	30.3	30.3			30.3
Capital contributions (distributions)	920.6	924.4			924.4			(3.8)
Equity at end of period at Dec. 31, 2022	4,049.5	4,030.2			4,153.6	(155.3)	31.9	19.3
Net income (loss)	(312.2)	(316.1)			(316.1)			3.9
Other comprehensive income (loss), net of taxes	(118)	(117.8)				(95)	(22.8)	(0.2)
Total comprehensive income (loss), net of taxes	(430.2)	(433.9)			(316.1)	(95)	(22.8)	3.7
Share-based compensation	21.9	21.9			21.9
Capital contributions (distributions)	(64.2)	(63.4)			(63.4)			(0.8)
Equity at end of period at Dec. 31, 2023	3,577	3,554.8			3,796	(250.3)	9.1	22.2
Net income (loss)	(361.9)	(365.8)			(365.8)			3.9
Other comprehensive income (loss), net of taxes	(21)	(21)				(13.3)	(7.7)
Total comprehensive income (loss), net of taxes	(382.9)	(386.8)			(365.8)	(13.3)	(7.7)	3.9
Issuance of shares	0		7.2	(0.1)	(7.1)
Share-based compensation	15.1	15.1			15.1
Capital contributions (distributions)	1,177.7	1,177.7			1,177.7
Equity at end of period at Dec. 31, 2024	SFr 4,386.9	SFr 4,360.8	SFr 7.2	SFr (0.1)	SFr 4,615.9	SFr (263.6)	SFr 1.4	SFr 26.1

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net income (loss)	SFr (361.9)	SFr (312.2)	SFr 84
Income tax benefit (expense)	(16.7)	(59.9)	(50.7)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Share-based compensation expense	19.1	22.5	30.7
Depreciation of RoU assets	129.7	128	145.4
Depreciation of PP&E and amortization of intangibles	917.9	992.1	1,028.8
Restructuring and other operating items	49.8	86.2	149.1
Financial income	(257.7)	(574.7)	(456.7)
Financial expenses	742.6	957.2	340.2
Dividends received	3	3.1	2.8
Interest received	1.6	0.9	0.6
Tax refunds	0	4	1.1
Taxes paid	(1.1)	0	(10.4)
Changes in operating assets and liabilities and other	52.8	(45.7)	(12.2)
Net cash provided by operating activities	1,279.1	1,201.5	1,252.7
Cash flows from investing activities:
Capital expenditures	(541.1)	(468)	(417.4)
Cash paid in connection with acquisitions, net of cash acquired	0	(85.1)	0
Acquisition of equity-accounted investees	(0.6)	0	(35.8)
Net advances from (to) related parties	112.7	(204.8)	(71)
Cash received for other investing activities	0	0.1	36.2
Cash paid for other investing activities	(49.7)	(2.8)	(55)
Net cash used in investing activities	(478.7)	(760.6)	(543)
Cash flows from financing activities:
Interest paid	(420.2)	(422.5)	(329.3)
Vendor financing additions	363.4	271.2	148.2
Repayments of debt	(1,064.7)	0	(899.4)
Principal payments on vendor financing	(377)	(296.6)	(284.5)
Payment of lease liabilities	(114.4)	(107.6)	(112.4)
Payment of financing costs and debt premiums	0	0.1	(26.3)
Net cash received (paid) for interest related derivative instruments	172.7	174.5	42.2
Net cash received (paid) for principal related derivative instruments	(120.4)	(57.4)	(47.1)
Capital contribution from parent	1,106.2	0	955.8
Related-party payments	0	0	(149.2)
Issuance of share capital	0.1	0	0
Repurchase of treasury stock	(0.1)	0	0
Cash paid for other financing activities	0	(1.8)	(12)
Net cash used in financing activities	(454.4)	(440.1)	(714)
Net increase (decrease) in cash and cash equivalents:	346	0.8	(4.3)
Cash and cash equivalents at the beginning of year	4.8	2.3	5.5
Effect of exchange rate changes on cash	1	1.7	1.1
Cash and cash equivalents at the end of year	SFr 351.8	SFr 4.8	SFr 2.3

GENERAL INFORMATION

GENERAL INFORMATION	12 Months Ended
	Dec. 31, 2024
General Information [Abstract]
GENERAL INFORMATION	GENERAL INFORMATION Sunrise Communications AG is a public company incorporated, domiciled and registered in Switzerland. The registered office of Sunrise Communications AG are located at Glattpark (Opfikon), Thurgauerstrasse 101b, 8152, Switzerland. These consolidated financial statements for the years ended 31 December 2024 and 31 December 2023 are in substance a continuation of the previously reported F-4 financials of Sunrise HoldCo V B.V. The reporting period 2024 presented comprises the consolidated financial statements of Sunrise Communications AG and its subsidiaries (collectively referred to as 'Sunrise'). The comparative periods 2023 and 2022 presented reflect the carrying amounts from the consolidated financial statements of Sunrise HoldCo V B.V. Sunrise’s principal operating company, Sunrise GmbH, is a full-range telecommunications provider in Switzerland, offering mobile voice and data, landline services (retail and wholesale voice, business and integration services), video and landline Internet including Internet Protocol Television (IPTV) services to both residential and business customers as well as to other operators. Sunrise has its own national backbone landline and IP network as well as its own mobile network based on 4G and 5G technologies. In connection with the services it provides, Sunrise also resells handsets manufactured by third-party suppliers. In connection with the spin-off from Liberty Global Ltd (hereinafter 'LG'), a series of reorganization steps were completed. The transaction resulted in separation from LG and the formation of the Sunrise Communications AG, whose shares are listed at the SIX Swiss Exchange. The reorganization transactions included the following steps: Formation of Sunrise Communications AG Liberty Global Ltd. formed Sunrise Communications AG, a Swiss-incorporated entity, on 3 May 2024, as part of the spin-off preparations with a cash contribution of CHFk 100 (1,000,000 shares with a nominal value of CHF 0.10 per share). Internal restructuring On 22 October 2024, Liberty Global contributed subsidiaries and assets to Sunrise HoldCo VI B.V., and aligned its intercompany loans with external debt terms. Repayment of external debt From 28 October to 1 November 2024, Sunrise entities streamlined intercompany loan structures, extinguished redundant agreements and repaid external debts. Spin-off execution At the Extraordinary General Meeting of Liberty Global Ltd (hereinafter “LG”) on 25 October 2024, Liberty Global shareholders approved the proposed 100% spin-off of Sunrise through the distribution of Sunrise shares. Immediately before the execution of the spin-off, Sunrise HoldCo VI BV, the former parent entity, was contributed by the sole shareholder LG to Sunrise Communications AG for the issuance of 68,759,702 Sunrise Class A shares and 25,977,316 Sunrise Class B shares with a nominal value of CHF 0.10 per share, respectively CHF 0.01 per share. The transaction did not meet the definition of business combination under IFRS 3, because neither Sunrise nor LG were identified as acquirer. Sunrise's equity position was adjusted to reflect the share capital structure of Sunrise Communications AG. Other amounts in equity (such as revaluation reserves and retained earnings) include amounts from the historical consolidated financial statements of Sunrise HoldCo V B.V. As of the spin-off date, 68,759,702 Sunrise Class A common shares and 25,977,316 Sunrise Class B shares were outstanding. These shares have been distributed by LG to its shareholders in the form of American Depositary Shares (ADS) on 12 November 2024.For every five Class A or Class C LG share, Liberty Global shareholders have received one Sunrise Class A ADS, held as of the close of business on the distribution record date of 4 November 2024, and 2 Sunrise Class B ADS for every LG Class B share. The spin-off transaction did not result in any changes to the existing shareholder group. Sunrise Class A ADS began trading on Nasdaq under the ticker symbol "SNRE" on 13 November 2024, while the Sunrise Class A common shares began trading on the SIX Swiss Exchange under the ticker symbol "SUNN" on 15 November 2024. These consolidated financial statements have been approved and authorized by the Board of Directors for issuance on 26 February 2025 in accordance with a resolution of Sunrise’s Board of Directors.

BASIS OF PREPARATION AND SCOPE

BASIS OF PREPARATION AND SCOPE OF CONSOLIDATION	12 Months Ended
	Dec. 31, 2024
Basis of Preparation and Scope of Consolidation [Abstract]
BASIS OF PREPARATION AND SCOPE OF CONSOLIDATION	BASIS OF PREPARATION AND SCOPE OF CONSOLIDATION These consolidated financial statements have been prepared in accordance with IFRS Accounting Standards ('IFRS') as issued by the International Accounting Standards Board ('IASB') and are referred to hereinafter as consolidated financial statements. They present the activities, assets and liabilities of Sunrise, as included in the scope of consolidation, and contain the financial information of the legal entities of Sunrise. Sunrise forms a separate group of legal entities in all years presented. All intercompany transactions and balances within Sunrise have been eliminated. Any respective material events occurring after 31 December 2024 are disclosed in Note 29. These consolidated financial statements present the assets, liabilities, revenues, expenses and cash flows attributable to Sunrise. The consolidated financial statements have been prepared under the historical cost convention, unless otherwise indicated. The fair value of financial assets and liabilities is presented in Note 24. The consolidated financial statements have been prepared under the assumption of going concern. The presentation currency of these consolidated financial statements is the Swiss franc ('CHF'). Due to rounding, numbers presented throughout this report may not add up precisely to the totals provided. All ratios and variances are calculated using the precise underlying amount rather than the presented rounded amount. The preparation of these consolidated financial statements require management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the balance sheet date and the reported amounts of revenue and expenses during the fiscal period. These estimates are based on management’s best knowledge of current events and actions that Sunrise may undertake in the future. Please refer to Note 4 for further details. See Note 26 for additional disclosures regarding transactions with related parties.

MATERIAL ACCOUNTING POLICIES

MATERIAL ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2024
Material Accounting Policies [Abstract]
MATERIAL ACCOUNTING POLICIES	MATERIAL ACCOUNTING POLICIES These consolidated financial statements were prepared in accordance with the accounting policies described and the amendments effective as of 1 January 2024 which are described below. Sunrise has not early adopted any standard, interpretation or amendment that has been issued but is not yet effective. Several amendments apply for the first time in 2024, which did not have a material impact on the consolidated financial statements of Sunrise. Standard Name Effective from Amendments to IFRS 16 Lease liability in a sale and leaseback transaction 1 January 2024 Amendments to IAS 1 Classifying liabilities as current or non-current 1 January 2024 Amendments to IAS 1 Classifying non-current liabilities with covenants 1 January 2024 Amendments to IAS 7 Supplier finance arrangements 1 January 2024 Foreign currency translation These consolidated financial statements are presented in Swiss francs ('CHF'), which is the reporting currency of Sunrise. The functional currency is the currency applied in the primary economic environment. Transactions in currencies other than the functional currency are translated at the transaction-date exchange rates or the average rate. Foreign exchange gains and losses arising from differences between transaction date and settlement date rates are recognized as financial income or expenses in the consolidated statements of income or loss. The following table summarizes the principal exchange rates used by Sunrise (shown against CHF): December 31 2024 2023 2022 Spot rates: Euro 1.0645 1.077 1.0128 US Dollar 1.1016 1.1916 1.0847 Year ended December 31 2024 2023 2022 Average rates: Euro 1.0502 1.0295 0.9948 US Dollar 1.1362 1.1135 1.0478 Revenue from contracts with customers Revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration (net of VAT) to which the entity expects to be entitled in exchange for those goods or services. Revenue is recognized when the customer obtains control of the promised goods or services. Significant sources of revenue are explained in Note 6. Sunrise groups multi-component contracts (e.g., mobile subscription with subsidized mobile hardware) into portfolios and allocates the total transaction price to each separate performance obligation (including undelivered elements) in proportion to the stand-alone selling prices. Revenue is recognized when the customer obtains control of the separate components. In the consolidated statements of financial position, timing differences in the recognition of revenue between separate performance obligations lead to the recognition of a contract asset, i.e., a legally not yet entitled right to consideration from a contract with a customer. Incremental costs to obtain a contract with a customer, such as incremental sales commissions, are generally recognized as assets and amortized over the applicable period benefited, which generally is the contract life. If, however, the amortization period is less than one year, Sunrise expenses such costs in the period incurred. In contrast, activation fees lead to the recognition of a contract liability, i.e., the obligation to transfer goods or services to a customer for which the entity has received consideration from the customer. Contract assets and liabilities are determined at the contract level and not at the performance obligation level. Accrued income and deferred discounts are classified as part of contract assets. Revenue is recognized gross when Sunrise acts as a principal in a transaction. For content-based services and handsets sold via third party retailers, where Sunrise acts as an agent, revenue is recognized net of direct costs. Direct costs Direct costs are related to acquiring, producing or gaining access to the product, content or service that is sold to the customer. These include, but are not limited to, costs for hardware, access, copyrights, programming, roaming, interconnection, new build and built-to-suit. Property, plant and equipment Property, plant and equipment ('PP&E') are measured at cost less accumulated depreciation and write-downs for impairment. Costs comprise purchase price and costs directly attributable to the acquisition until the date on which the asset is ready for use, as well as the estimated costs of dismantling and restoring the site. The costs of self-constructed assets include directly attributable payroll costs, materials, parts purchased, and services rendered by sub-suppliers during the construction period. Costs also include estimated asset retirement costs on a discounted basis if the related obligation meets the conditions for recognition as a provision. The depreciation base is measured at cost less residual value and any write-downs. Depreciation is provided on a straight-line basis over the estimated useful life of the assets as follows: Asset category Useful lives Support equipment and buildings 3 to 33 years Distribution systems 3 to 30 years Customer premises equipment ('CPE') 4 to 5 years The depreciation expense of property, plant and equipment is included in depreciation and amortization expenses in the consolidated statements of income or loss. Property, plant and equipment that have been disposed of or scrapped are eliminated from accumulated costs and accumulated depreciation. Gains and losses arising from the sale of property, plant and equipment are measured as the difference between the sales price less selling expenses and the carrying value at the time of sale. The resulting gain or loss is recognized in the consolidated statements of income or loss in other operating income or other operating expenses, respectively. Software that is an integral part of a tangible asset (e.g., telephone exchange installations) is presented together with the related tangible assets. If indications exist that the value of an asset may be impaired, the recoverable amount of the asset is determined. If the recoverable amount of the asset, which is the higher of the fair value less costs to sell and the value in use, is less than its carrying amount, the carrying amount is reduced to the recoverable amount. Intangible assets Intangible assets comprise software, licenses and rights, brands and other intangible assets required to operate the business, and software developed or customized by Sunrise. Intangible assets are measured at cost less accumulated amortization and impairment losses and are amortized on a straight-line basis over their estimated useful lives. Broadcasting rights and spectrum licenses are generally multi-year contracts, for which an asset is recognized in the amount of the contract consideration with a corresponding liability for any unpaid portion of the total contract costs at contract inception. The rights are amortized on a straight-line basis over the contract term. Asset category Useful lives Software 3 to 5 years Licenses and rights 5 to 26 years Brands and customer relationships 6 to 10 years Other intangible assets 2 to 25 years The amortization expense of intangible assets is included in depreciation and amortization expenses in the consolidated statements of income or loss. Development projects, including costs of computer software purchased or developed for internal use, are recognized as intangible assets if the costs can be calculated reliably and if they are expected to generate future economic benefits. Costs of development projects include wages and external charges. Development projects that do not meet the criteria for recognition in the consolidated statements of financial position are expensed as incurred. Non-derivative financial instruments Cash and cash equivalents, current trade and other receivables, current related-party receivables and payables, certain other current assets, accounts payable and certain accrued liabilities represent financial instruments that are initially recognized at fair value and subsequently carried at amortized cost. Due to their relatively short maturities, the carrying values of these financial instruments approximate their respective fair values. Loans and other receivables are financial assets with fixed or determinable payments that are not quoted in an active market. Such loans and other receivables are recognized initially at fair value plus any directly attributable transaction costs. Subsequent to initial recognition, loans and receivables are measured at amortized cost using the effective interest method, less any impairment losses. Leases Sunrise leases mainly consist of rental of distribution systems, support equipment, buildings and land. Sunrise recognizes a right-of-use ('RoU') asset and a lease liability at the lease commencement date. The RoU asset is initially measured at cost, which comprises the initial amount of the lease liability adjusted for any lease payments made at or before the commencement date, plus any initial direct costs incurred. Furthermore, the RoU asset is adjusted for an estimate of costs to dismantle and remove the underlying asset or to restore the underlying asset or the site on which it is located. The RoU assets are subsequently depreciated using the straight-line method from the commencement date to the earlier of the useful life of the RoU asset or the end of the lease term. The useful lives per asset class are as follows: Asset category Useful lives Support equipment, buildings and land 3 to 33 years Distribution systems 3 to 30 years In addition, RoU assets are periodically reduced by impairment losses, if any, and adjusted for certain remeasurements of the lease liability. The RoU assets and the lease liabilities are presented separately in the consolidated financial statements. Lease liabilities are initially measured at the present value of the future lease payments, discounted using the interest rate implicitly specified in the lease or Sunrise’s incremental borrowing rate as the discount rate. Sunrise applies the short-term lease recognition exemption to leases of less than 12 months. Lease payments associated with these leases are recognized as an expense on a straight-line basis over the lease term. Inventories Inventories are measured at the lower of cost and net realizable value. The costs of merchandise include purchase price and delivery costs. The costs of work in progress comprise direct costs of merchandise, direct labor, other direct costs and related production overheads. Related costs for items sold are presented within direct costs in the consolidated statements of income or loss. Trade receivables and other receivables Receivables are measured at amortized cost net of an allowance for uncollectible amounts. The allowance for trade receivables and contract assets is always measured at an amount equal to lifetime expected credit loss ('ECL'). When determining whether the credit risk of a financial asset has increased significantly, Sunrise considers both quantitative and qualitative information and analysis based on its historical experience, internal credit assessment and forward-looking information. Allowances for anticipated uncollectible amounts are based on individual assessments of major receivables and historically experienced losses on uniform groups of other receivables. This allowance is equal to the difference between the carrying amount and the present value of the amounts expected to be recovered. Significant financial difficulties of the debtor, the probability that the debtor will enter bankruptcy or financial reorganization, and default or delinquency in payments are considered indicators that the receivable is impaired. The loss is recognized in the consolidated statements of income or loss within other operating expenses. When a trade receivable is uncollectible, it is written off against the allowance account. Subsequent recoveries of amounts previously written off are credited against other operating expenses in the consolidated statements of income or loss. Cash and cash equivalents Cash and cash equivalents comprise cash at banks and in hand and deposits held at call with banks with a maturity of less than three months at inception. Bank overdrafts are included in current liabilities. Provisions An asset retirement obligation ('ARO') is recognized when Sunrise has a legal or constructive obligation to remove the asset and restore the site where the asset was used at the end of the lease term (e.g., in connection with the future dismantling of mobile stations and restoration of property owned by third parties). Sunrise has estimated and capitalized the net present value of the obligations and increased the carrying amount of the asset by the respective amount. The estimated cash flows are discounted using a risk-adjusted interest rate, which is derived from Swiss government bonds along with a company-specific risk spread based on issued corporate bonds, and recognized as a provision. Subsequently, the unwinding of the discount is expensed in financial expenses. The capitalized amount is amortized over the expected lease period, including the potential extension option if it is expected to be exercised. Provisions are measured at management’s best estimate of the amount at which the liability is expected to be settled. If the timing of the settlement has a significant impact on the measurement of the liability, such liability is discounted. Pensions Sunrise’s pension plans comprise defined benefit plans established under Swiss pension legislation. Obligations are determined by independent qualified actuaries using the projected unit credit method assuming that each year of service gives rise to an additional unit of benefit entitlement and each unit is measured separately to build up the final obligations. Sunrise recognizes a gain or loss on curtailment when a commitment is made to significantly reduce the number of employees, generally as a result of a restructuring or disposal/discontinuation of part of the business or the outsourcing of business activities. Gains or losses on curtailment or, settlement of pension benefits are recognized in the consolidated statements of income or loss when the curtailment or settlement occurs. Differences between projected and realized changes in pension assets and pension obligations are referred to as actuarial gains and losses and are recognized in the consolidated statements of other comprehensive income when such gains and losses occur. In the case of changes in benefits relating to employees’ previous service periods, a change in the estimated present value of the pension obligations will be immediately recognized. The present value of the pension obligation is measured using a discount rate based on the interest rate on high-quality corporate bonds where the currency and terms of the corporate bonds are consistent with the currency and estimated terms of the defined benefit obligation. Amendments to IFRS Accounting Standards and Interpretations, whose application is not yet mandatory The following IFRS Accounting Standards and Interpretations published up to the end of 2024 are mandatory from the 2025 financial year onwards. Standard Name Effective from Amendments to IAS 21 Lack of exchangeability 1 January 2025 Amendments to IFRS 9 and IFRS 7 Classification and Measurement of Financial Instruments 1 January 2026 Amendments to IFRS 1, 7, 9, 10 and IAS 7 Annual Improvements to IFRS Accounting Standards 1 January 2026 Amendments to IFRS 9 Contracts Referencing Nature-dependent Electricity 1 January 2026 IFRS 18 Presentation and disclosure in financial statements 1 January 2027 IFRS 19 Subsidiaries without Public Accountability: Disclosures 1 January 2027 Sunrise will review its financial reporting for the impact of those new and amended standards which take effect on or after 1 January 2025 and which Sunrise did not choose to adopt earlier than required. At present, Sunrise anticipates no material impact on the consolidated financial statements, except for IFRS 18 issued by the IASB on 9 April 2024 . IFRS 18 will replace IAS 1, although many existing principles in IAS 1 are retained. The key concepts introduced in IFRS 18 relate to the structure of the statement of profit or loss, required disclosures in the financial statements for certain profit or loss performance measures that are reported outside an entity’s financial statements (that is, management-defined performance measures); and enhanced principles on aggregation and disaggregation which apply to both the primary financial statements and notes. IFRS 18 will not impact the recognition or measurement of items in the financial statements, but may change what an entity reports as its "operating profit or loss". Sunrise is currently evaluating the potential impact of IFRS 18 on its consolidated financial statements.

USE OF JUDGMENTS AND ESTIMATES

USE OF JUDGMENTS AND ESTIMATES	12 Months Ended
	Dec. 31, 2024
Use of Judgements and Estimates [Abstract]
USE OF JUDGMENTS AND ESTIMATES	USE OF JUDGMENTS AND ESTIMATES The following specific estimates and judgments are considered important when portraying Sunrise’s financial position: • Useful life of intangible assets and property, plant and equipment, as shown in Note 3, is assigned based on periodic studies of the actual useful life and intended use of those assets. Such studies are completed or updated whenever new events occur with the potential to impact the way the useful life of the asset is determined, such as events or circumstances that indicate that the carrying value of the asset may not be recoverable and should therefore be tested for impairment. Any change in the estimated useful life of these assets is recognized in the financial statements as soon as any such change is determined. For details, see Note 14 and Note 15. • Goodwill and intangible assets comprise a significant portion of the Sunrise’s total assets. The impairment test for intangible assets is a complex process that requires significant management judgment in determining various assumptions, such as cash flow projections, discount rate and terminal growth rates. The sensitivity of the estimated measurement to these assumptions, consolidated or individually, can be significant. Furthermore, the use of different estimates or assumptions when determining the fair value of such assets may result in different values and could result in impairment charges. For details, see Note 15 and Note 16. • Right-of-use assets and lease liabilities amount to a significant portion of the Sunrise’s consolidated statements of financial position (see Note 13). The valuation is based on several judgments, starting with the assessment of whether a contract contains a lease. Other material judgments made by Sunrise include assumptions concerning the lease terms and the probability that an extension option will be exercised. • Net periodic pension cost for defined benefit plans is estimated based on certain actuarial assumptions, the most significant of which relate to discount rate and future salary increases. As shown in Note 10, the assumed discount rate reflects changes in market conditions. Sunrise believes these assumptions illustrate current market conditions. • Estimates of deferred taxes and significant items giving rise to deferred assets and liabilities are shown in Note 19. These reflect the assessment of future taxes to be paid on items in the financial statements, giving consideration to both the timing and probability of these estimates. In addition, such estimates reflect expectations about the amount of future taxable income and, where applicable, tax planning strategies. Actual income taxes and income for the period may vary from these estimates as a result of changes in expectations about future taxable income, future changes in income tax law or the final review of tax returns by tax authorities. • Provisions for asset retirement obligations are made for costs incurred in connection with the future dismantling of mobile stations and restoration of property owned by third parties. These provisions are primarily based on estimates of future costs for dismantling and restoration, long-term inflation and discount rate expectations, as well as the timing of the dismantling. See Note 17.

SEGMENT REPORTING

SEGMENT REPORTING	12 Months Ended
	Dec. 31, 2024
Operating Segments [Abstract]
SEGMENT REPORTING	SEGMENT REPORTING For management purposes, Sunrise is organized into business units which reflect the different customer groups to which Sunrise provides its telecommunications products and services and has the following three operating segments, which are its reportable segments: • Residential customers • Business customers & Wholesale • Infrastructure & Support functions The Board of Directors assumes the role of the Chief Operating Decision Maker ('CODM') and monitors the operating results of the segments Residential customers, Business customers & Wholesale and Infrastructure & Support functions separately for the purpose of making decisions about resource allocation and performance assessment. Each of these segments engages in its particular business activity which is described below: • Residential customers : provides fixed-line and mobile services to residential end customers as well as sales of handsets. Sunrise focuses on selling its products in the Swiss telecommunications market by marketing bundled offers in fixed/Internet, mobile and IPTV. • Business customers & Wholesale : provides a full range of products and services, from fixed-line and mobile communications to Internet and data services as well as integration services to different business areas: small office and home office, small and medium-size managed enterprises and large corporate clients. The wholesale product portfolio covers voice, data, Internet and infrastructure services such as carrier and roaming services, which are marketed to business customers. • Infrastructure & Support functions : activities comprise support units such as network, IT and operations (customer care) as well as staff functions like finance, human resources and strategy. Performance is measured based on Adjusted EBITDAaL as included in the internal financial reports reviewed by the CODM. This is considered an adequate measure of the operating performance of the segments reported to the CODM for the purposes of resource allocation and performance assessment. Assets and liabilities are not allocated to operating segments in the management reports reviewed by the CODM, as the review focuses on adjusted EBITDAaL. Sunrise’s finance income, finance expenses and income tax expenses are reviewed on a total level, and therefore not allocated to operating segments. As Sunrise mainly operates in Switzerland, no geographical information is further presented. Segment information Year ended December 31, 2024 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Total revenue 2,173.1 830.3 14.6 3,018.0 Direct costs (515.2) (299.5) (15.4) (830.1) Indirect costs 1 (401.5) (115.8) (449.1) (966.4) Lease expense 2 (52.0) (13.5) (133.9) (199.4) Adj. EBITDA after lease expense (EBITDAaL) 1,204.4 401.5 (583.8) 1,022.1 Depreciation and amortization of property, plant and equipment and intangible assets (917.9) Share-based compensation, restructuring & other (69.0) Finance income/(expense) 3 (413.8) Income tax benefit 16.7 Net income (loss) (361.9) 1 Excludes expenses for share-based compensation, restructuring and other. 2 Contains depreciation and interest expenses for leases arrangements under IFRS 16. Excludes expenses for short-term leases, which are reported in line "indirect cost". 3 Excludes interest expenses for leases, which are included in line "lease expense". Year ended December 31, 2023 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Total revenue 2,247.1 776.6 11.5 3,035.2 Direct costs (537.6) (271.0) (26.0) (834.6) Indirect costs 1 (417.5) (115.4) (428.2) (961.1) Lease expense 2 (51.0) (11.2) (133.7) (195.9) Adj. EBITDA after lease expense (EBITDAaL) 1,241.0 379.0 (576.4) 1,043.6 Depreciation and amortization of property, plant and equipment and intangible assets (992.1) Share-based compensation, restructuring & other (108.6) Finance income/(expense) 3 (315.0) Income tax benefit 59.9 Net income (loss) (312.2) Year ended December 31, 2022 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Total revenue 2,275.5 752.3 7.4 3,035.2 Direct costs (538.4) (267.7) (13.5) (819.6) Indirect costs 4 (417.8) (111.7) (417.6) (947.1) Lease expense 5 (39.9) (10.4) (160.4) (210.7) Adj. EBITDA after lease expense (EBITDAaL) 1,279.4 362.5 (584.1) 1,057.8 Depreciation and amortization of property, plant and equipment and intangible assets (1,028.8) Share-based compensation, restructuring & other (179.7) Finance income/(expense) 6 184.0 Income tax benefit 50.7 Net income (loss) 84.0 4 Excludes expenses for share-based compensation, restructuring and other. 5 Contains depreciation and interest expenses for leases arrangements under IFRS 16. Excludes expenses for short-term leases, which are reported in line "indirect cost". 6 Excludes interest expenses for leases, which are included in line "lease expense".

REVENUE FROM CONTRACTS WITH CUS

REVENUE FROM CONTRACTS WITH CUSTOMERS	12 Months Ended
	Dec. 31, 2024
Revenue From Contracts With Customers [Abstract]
REVENUE FROM CONTRACTS WITH CUSTOMERS	REVENUE FROM CONTRACTS WITH CUSTOMERS Revenue by major category and reportable segment is set forth below: Year ended December 31, 2024 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Fixed 1,001.8 483.0 — 1,484.8 Subscription 987.8 293.4 — 1,281.2 Non-subscription and hardware 14.0 189.6 — 203.6 Mobile 1,041.1 343.9 — 1,385.0 Subscription 833.5 266.2 — 1,099.7 Non-subscription and hardware 207.6 77.7 — 285.3 Other 130.2 3.4 14.6 148.2 Total 2,173.1 830.3 14.6 3,018.0 Year ended December 31, 2023 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Fixed 1,061.7 437.4 — 1,499.1 Subscription 1,043.1 273.4 — 1,316.5 Non-subscription and hardware 18.6 164.0 — 182.6 Mobile 1,052.3 336.2 — 1,388.5 Subscription 852.9 254.7 — 1,107.6 Non-subscription and hardware 199.4 81.5 — 280.9 Other 133.2 2.9 11.5 147.6 Total 2,247.2 776.5 11.5 3,035.2 Year ended December 31, 2022 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Fixed 1,088.3 430.6 0.7 1,519.6 Subscription 1,079.6 270.0 0.7 1,350.3 Non-subscription and hardware 8.7 160.6 — 169.3 Mobile 1,053.5 320.8 — 1,374.3 Subscription 854.8 240.6 — 1,095.4 Non-subscription and hardware 198.7 80.2 — 278.9 Other 133.7 0.9 6.7 141.3 Total 2,275.5 752.3 7.4 3,035.2 Subscription revenue Sunrise recognizes service revenue from mobile and fixed services over the contractual period. Installation or activation fees related to the services provided are deferred as contract liabilities and recognized over the contractual period. Revenue from the sale of prepaid services is deferred and recognized at the time of use. Discounts that can be allocated to service revenues are evenly distributed over the minimum contract binding period. Mobile subscriptions have no contract term beyond a 60 days notice period, whereas residential services require a minimum contract duration of 12 months. For contracts combined with a promotion, the typical minimum contract term is 24 months. For B2B service contracts, the contract term is typically between one Non-subscription and hardware Non-subscription revenues include mainly revenue from hardware sales, which are recognized at point-in-time upon delivery. Revenue from carrier and roaming services offered to medium and large enterprises and fixed-line and mobile services on a wholesale basis to other operators are recognized over the contractual period. Other Contract assets Contract assets primarily relate to Sunrise’s rights to consideration for hardware sold within a bundle arrangement but not yet billed. The following table provides information about contract assets and contract liabilities from contracts with customers. December 31 2024 2023 2022 CHF in millions Contract assets 27.8 31.7 22.5 The following table includes revenue from contracts with an original duration of more than one year which is expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the reporting date. Year ended December 31 2025 2026 2027 CHF in millions Telecommunications services (mobile and fixed) 56.9 15.0 7.1 Sunrise makes use of the practical expedients in IFRS 15, according to which unsatisfied performance obligations under contracts with an expected original term of no more than one year and revenues recognized in accordance with the billed amounts are exempt from the disclosure requirement. Contract liabilities Contract liabilities primarily relate to deferred revenue including broadband cable services and subscription fees, as well as activation fees for which revenue is recognized over the term of the service contract. December 31 2024 2023 2022 CHF in millions Contract liabilities to residential customers 46.0 43.1 55.3 Contract liabilities to business customers 28.0 36.3 19.2 Contract liabilities to other telecommunications services 0.8 0.4 0.5 Total 74.8 79.8 75.0 Thereof current portion of contract liabilities 71.3 66.7 69.9 Thereof non-current portion of contract liabilities 3.5 13.1 5.1 Contract costs According to IFRS 15, commission fees directly attributable to a contract are capitalized and recognized as expenses over the estimated contract duration. This means that capitalized commission fees are amortized when the related revenues are recognized. The capitalized costs are amortized in other operating expenses or personnel expenses, depending on whether the costs are paid to external retailers or own employees. 2024 2023 CHF in millions Balance as of January 1 69.3 62.5 Additional capitalised contract cost 88.1 71.6 Amortized contract cost (77.0) (64.8) Balance as of December 31 80.4 69.3

OTHER OPERATING INCOME AND EXPE

OTHER OPERATING INCOME AND EXPENSES	12 Months Ended
	Dec. 31, 2024
Analysis of income and expense [abstract]
OTHER OPERATING INCOME AND EXPENSES	OTHER OPERATING INCOME AND EXPENSES Year ended December 31 2024 2023 2022 CHF in millions Marketing & Commissions (188.8) (195.2) (195.9) Network related costs (170.6) (167.4) (207.6) Professional Services (105.7) (130.2) (130.1) Facility & Energy (66.5) (55.1) (51.0) IT expenses (57.6) (49.4) (50.9) Administration (34.7) (39.4) (43.0) Call centre services (34.7) (39.2) (39.6) Allowance for receivables (35.3) (16.9) (27.6) Other (2.5) (66.1) (4.4) Total other operating expenses (696.4) (758.8) (750.2) Capitalized labor as non-current assets 63.0 68.3 60.1 Other income 5.1 37.4 1.5 Total other operating income and capitalized labor 68.1 105.7 61.7 Other operating expenses In 2024, expenditures for professional services experienced a reduction amounting to CHF 24.5 million in comparison to the preceding year. This decline was primarily attributable to a CHF 14.4 million decrease in intercompany-related as well as a CHF 13.0 million reduction in contracting services. Conversely, facility and energy expenses increased by CHF 11.4 million relative to the prior year, predominantly driven by elevated electricity costs. Furthermore, the allowance for receivables saw an increase of CHF 18.4 million compared to the previous year, largely influenced by one-time items. In 2023, the category "Other" included a CHF 29.1 million ice-hockey distribution-rights penalty issued by the Competition Commission as well as CHF 28.5 million expenses related to restructuring. The categories disclosed for other operating expenses do not include expenses that were included in other financial statement line items (such as personnel expenses or depreciation). Other operating income and capitalized labor In 2023, Sunrise recognized CHF 17.2 million income related to disputed overcharges by Swisscom, and CHF 20.0 million abandoned lease income related to the former Wallisellen office building.

PERSONNEL EXPENSES

PERSONNEL EXPENSES	12 Months Ended
	Dec. 31, 2024
Personnel Expenses [Abstract]
PERSONNEL EXPENSES	PERSONNEL EXPENSES Year ended December 31 2024 2023 2022 CHF in millions Wages, salaries and social security charges 363.9 384.2 380.8 Pension expenses 24.0 10.0 26.8 Share-based compensation 19.1 22.5 30.7 Total 407.0 416.7 438.3

KEY MANAGEMENT PERSONNEL COMPEN

KEY MANAGEMENT PERSONNEL COMPENSATION	12 Months Ended
	Dec. 31, 2024
Key Managment Personnel Compensation [Abstract]
KEY MANAGEMENT PERSONNEL COMPENSATION	KEY MANAGEMENT PERSONNEL COMPENSATION Key management personnel comprise the members of the Executive Leadership Team and the members of the Board of Directors. Their compensation is as follows: Remuneration of the Executive Leadership Team and Board of Directors Year ended December 31 2024 2023 2022 CHF in millions Wages, salaries and social security charges 8.4 6.2 8.0 Pension costs 0.8 0.8 1.2 Share-based compensation 6.6 6.9 9.1 Termination benefits 0.7 2.5 0.7 Total 16.5 16.4 19.0

EMPLOYEE BENEFIT OBLIGAITONS

EMPLOYEE BENEFIT OBLIGAITONS	12 Months Ended
	Dec. 31, 2024
Employee Benefit Obligations [Abstract]
EMPLOYEE BENEFIT OBLIGAITONS	EMPLOYEE BENEFIT OBLIGATIONS Sunrise provides retirement benefits to its employees as required by Swiss law by means of a pension fund that is a separate legal entity. The Sunrise Pension Fund is a separate, semi-autonomous foundation governed by the Occupational Pensions and Foundations Office of the Canton of Zurich. Disability and death risks are reinsured by Zurich Insurance. The fixed assets of the Sunrise Pension Fund are managed by Credit Suisse Asset Management in Zurich in accordance with organizational guidelines and investment regulations. The Board of Trustees consists of an equal number of employer and employee representatives and is responsible for managing the Foundation in accordance with Swiss law. Per the Occupational Pensions Act, a temporary funding shortfall is permitted. The Board of Trustees must take appropriate measures to resolve the shortfall within a reasonable timeframe. If those measures do not lead to the desired results, the Pension Fund may temporarily charge remedial contributions to employers, insured persons, and pensioners. The employer contribution must at least equal the aggregate contributions levied from the insured persons. The pension fund operates a pension plan for all staff, which qualifies as a defined benefit plan under IAS 19. Future pension benefits are based primarily on years of credited service and on contributions made by the employee and employer over the service period, which vary according to age as a percentage of insured salary. The rate of annual interest credited to employee accounts on the balance representing the minimum amount required under pension law is defined by the Swiss government. In addition, the conversion factor used to convert the accumulated capital upon retirement into an annual pension is also defined by the Swiss government. In the case of over-funding, it may be possible to a limited extent to reduce the level of contributions from both employer and employee. Distribution of excess funds from the pension fund to Sunrise is not possible. These defined benefit plans expose Sunrise to actuarial risks, such as currency risk, interest rate risk and market (investment) risk. A curtailment gain of CHF 13.5 million has been recorded in 2023 (2022: CHF nil), due to a restructuring event in the respective year. In 2024, no curtailment gain has been recorded. Pension (income) costs resulting from defined benefit plans December 31 2024 2023 2022 CHF in millions Current service costs excluding interest costs 19.5 16.9 20.7 Net interest costs on defined benefit obligation and service costs 0.4 0.3 0.1 Past service income (2.1) (13.5) (0.3) Administration costs 1.7 0.6 0.9 Termination benefits 0.2 0.2 0.2 Total 19.7 4.5 21.6 Assets and obligations December 31 2024 2023 CHF in millions Fair value of plan assets 851.4 793.7 Defined benefit obligation (859.8) (802.1) Total (8.4) (8.4) Movement in other comprehensive income December 31 2024 2023 2022 CHF in millions Actuarial (gain) / loss due to demographic assumptions — (0.1) (0.6) financial assumptions 15.5 81.0 (163.9) experience adjustments 39.9 5.6 11.8 Actuarial (gain) / loss during period 55.4 86.5 (152.6) Return on defined benefit plan assets (greater)/less than net interest recognised (48.4) (18.8) 108.4 Impact of changes in asset ceiling — (37.3) 33.2 Remeasurement effects recognized in OCI 7.0 30.4 (11.0) Movement in defined benefit obligations 2024 2023 CHF in millions Balance as of January 1 802.1 748.8 Included in the consolidated statements of income or loss Current service costs 19.5 16.9 Past service income (2.1) (13.5) Interest costs on defined benefit obligation 10.5 16.4 Administration costs and termination benefits 1.9 0.8 Settlements — (6.2) Included in consolidated statements of other comprehensive income Actuarial (gain) / loss arising from: Demographic assumptions — (0.1) Financial assumptions 15.5 81.0 Experience adjustment 39.9 5.6 Other Employee contributions 20.1 20.4 Benefits paid / transferred (47.5) (68.0) Total defined benefit obligations as of December 31 859.9 802.1 Movement in fair value of plan assets 2024 2023 CHF in millions Balance as of January 1 793.7 784.3 Included in the consolidated statements of income or loss Interest income 10.1 16.8 Settlements — (6.2) Included in consolidated statements of other comprehensive income Return on plan assets excluding interest income 48.4 18.8 Other Employer contributions 26.6 27.5 Employee contributions 20.1 20.5 Benefits paid (47.5) (68.0) Total fair value of plan assets as of December 31 851.4 793.7 Asset allocation of plan assets December 31 2024 2023 CHF in millions Quoted Unquoted CHF in millions Quoted Unquoted Cash and cash equivalents 12.1 — % 1.4 % 8.8 — % 1.1 % Equity securities 301.6 35.4 % — % 267.2 33.7 % — % Debt securities 305.8 35.9 % — % 299.5 37.7 % — % Real estate 168.5 1.5 % 18.3 % 159.4 2.8 % 17.2 % Other 63.4 — % 7.4 % 58.8 — % 7.4 % Total 851.4 72.8 % 27.2 % 793.7 74.3 % 25.7 % Plan assets do not include any property used by Sunrise companies. Furthermore, the defined benefit plans do not hold any shares of Sunrise or its subsidiaries. Periodically, an asset-liability matching study is performed by the pension fund’s asset manager, in which the consequences of the strategic investment policies are analysed (the latest study was conducted in 2022). The strategic investment policy of the pension fund can be summarized as follows: a strategic asset mix comprising 21% to 47% equity securities, 20% to 56% bonds, 12% to 38% real estate, 0% to 4% cash in banks and 0% to 7% other investments. Principal actuarial assumptions December 31 2024 2023 Discount rate 0.95 % 1.35 % Interest crediting rate 1.25 % 2.30 % Future salary increases 1.60 % 1.70 % Mortality rates BVG/LPP 2020 BVG/LPP 2020 As of 31 December 2024, the weighted average duration of the defined benefit obligation was 12.6 years (2023: 11.9 years). For 2025 , Sunrise's projected contributions to its pension funds total CHF 22.5 million. Reasonably possible changes at the reporting date to one of the relevant actuarial assumptions, holding other assumptions constant, would have affected the defined benefit obligation by the amounts shown below. As of the census date, 30 September 2024, 2,799 (30 September 2023: 2,882) active participants and 411 (30 September 2023: 409) participants receiving benefits were enrolled in the pension scheme. Sensitivity analysis 2024 Increase to Decrease to CHF in millions Discount rate (0.5% movement) 809.9 916.2 Future salary increases (1.0% movement) 871.7 849.9 Although the analysis does not take account of the full distribution of cash flows expected under the plan, it does provide an approximation of the sensitivity of the assumptions shown.

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangements [Abstract]
SHARE-BASED COMPENSATION	SHARE-BASED COMPENSATION In connection with the spin-off, the Liberty Global Compensation Committee adjusted the outstanding equity awards granted under the Liberty Global Long-Term Incentive Plan 2024 (Performance Incentive Plan) and converted the majority of the awards into Sunrise equity instruments, thereby ensuring alignment with the strategic priorities of Sunrise and its shareholders. For awards granted before 2024, no conversion to Sunrise equity instruments was made. For the latter awards, Sunrise needs to compensate LG. The amount for 2024 is disclosed in the table below the line "Other". Furthermore, Sunrise delivers Sunrise RSU to holders of LG RSU awards to compensate them for the diluting effect of the spin-off (see note 21). In addition, the members of the Executive Committe e and certain other employees have received an Initial Award in the form of equity-based instruments to align their interests with those of the shareholders and to support long-term value creation. Upon vesting of the awards, the respective shares are either created out of the conditional share capital or distributed from treasury shares. The Long-Term Incentive Plan ('LTIP') contains Restricted Share Units ('RSUs'), Performance Share Units ('PSUs') and Share Appreciation Rights ('SARs'). The awards related to this plan were granted on either 25 March 2024 or 2 August 2024. The Initial Award contains RSUs, PSUs, and Shares. The awards related to this plan were granted on either 6 December 2024 or 30 December 2024. In the financial year 2023, no such awards were granted. The following share-based compensation costs have been recognized in this financial year: December 31, 2024 CHF in millions Non-performance based incentive awards 4.9 Performance-based incentive awards 1.2 Shares 0.8 SHIP 1 2.3 Other 9.9 Total share-based payments costs 19.1 1 Certain employees can elect for (a portion of) their annual bonus to be paid out in shares. As a consequence, this expense is a part of total share-based compensation. 2 Sunrise has the intent to settle these awards in shares. General award information The award types granted are RSUs, PSUs, SARs and Shares. RSUs grant the right to receive shares on specified future vesting dates, subject to continued employment with Sunrise. The RSUs vest in equal yearly instalments over the course of the total vesting period. PSUs grant the right to receive shares on specified future vesting dates, subject to both a service condition and a performance condition. The vesting of the award depends on the service condition, while the number of shares being awarded per PSU depends on the achievement of the performance condition. For the PSUs of the LTIP 2024, the performance condition depends on the Relative Total Shareholder Return (rTSR) and the Cumulative Absolute Adjusted Free Cash Flow (FCF). The performance condition entitles the holder to between 0 and 1.85 shares per PSU. For the Initial Award PSUs, the performance criterion is the Implied Total Shareholder Return (TSR) based on achieved Internal Rate of Return (IRR) Performance %. The performance condition entitles the holder to between 0 and 1.5 shares per PSU. The PSUs vest in one instalment after the total vesting period. SARs give the participant the right to receive the value 2 of any increase in the share price over the base price of the grant date less withholding tax on the day the SAR is exercised. The SARs can be exercised at any time after vesting, until the expiration date. The SARs expire at the close of business on the tenth anniversary of the applicable grant date and vest in equal yearly instalments over the course of the total vesting period. Shares are awards in the form of shares that are transferred to the participant at grant date. Should a member of the Executive Committee terminate his/her employment prior to 31 December 2025 , Sunrise retains the right to reclaim all shares granted under this agreement, giving rise to an implied service condition. The categories in the table above are composed of the following awards: Grant date FV at grant date Non-performance based incentive awards LTI 2024 RSU 25/3/2024 34.07 LTI 2024 SAR 25/3/2024 9.66 LTI 2024 RSU 2/8/2024 36.59 LTI 2024 SAR 2/8/2024 10.45 Initial Award RSU 6/12/2024 41.55 Initial Award RSU 30/12/2024 39.32 Performance-based incentive awards LTI 2024 PSU 25/3/2024 50.01 LTI 2024 PSU 2/8/2024 44.65 Initial Award PSU 6/12/2024 42.09 Initial Award PSU 30/12/2024 42.09 Shares 6/12/2024 41.55 Fair value The LTIP 2024 was converted into a plan with underlying Sunrise shares using an adjustment factor. This was applied with the aim of ensuring that the fair value ('FV') of this plan as a whole did not significantly change. For the PSUs, the performance condition was modified to reflect the performance of Sunrise rather than Liberty Global. The modifications were made with the aim of leaving the total FV unchanged. The FV of the RSUs and Shares of the Initial Award is equal to the closing price of Sunrise Communications AG on the SIX Swiss Exchange on the respective grant date. The FV of the PSUs was based on a Monte Carlo model with one million simulations. An assumed share price volatility of 24.70% was utilized, alongside an entry price of CHF 40.61 and a risk-free rate of 1.01%. Number of units PSUs RSUs SARs Shares Total 2024 Balance January 1 - - - - - Granted 421,608 408,262 471,729 99,186 1,400,785 Settled - - - (99,186) (99,186) Forfeited - (8,863) (10,485) - (19,348) Balance December 31 421,608 399,399 461,244 0 1,282,251 Number of SARs units Weighted average strike price (CHF) Balance January 1 - - Granted 471,729 33.88 Forfeited (10,485) 33.57 Outstanding December 31 461,244 33.88

OTHER OPERATING ASSETS AND LIAB

OTHER OPERATING ASSETS AND LIABILITIES	12 Months Ended
	Dec. 31, 2024
Disclosure Of Other Operating Assets And Liabilities [Abstract]
OTHER OPERATING ASSETS AND LIABILITIES	OTHER OPERATING ASSETS AND LIABILITIES The details of Sunrise's other current and non-current assets as well as other current and non-current liabilities are set forth below: December 31 2024 2023 CHF in millions Other assets - current: Third party receivables 63.4 120.0 Prepayments 60.8 128.7 Contract assets 14.6 17.3 Contract costs 61.1 53.6 Inventories 58.5 50.1 Other 1.5 6.3 Total 259.9 376.0 Other assets - non-current: Trade receivables 34.3 44.0 Prepayments 82.1 31.7 Contract assets 13.2 14.4 Contract costs 19.2 15.8 Other 11.6 10.5 Total 160.4 116.4 Other liabilities - current: Accrued other liabilities 261.0 335.0 Accrued capital expenditures 63.5 66.9 Accrued payroll and employee benefits 68.3 83.0 Deferred revenue 71.3 66.7 Other 32.9 31.2 Total 497.0 582.8 Other liabilities - non-current: Other 48.2 89.8 Total 48.2 89.8 Write-downs of inventories to the net realizable v alue totalled CHF 0.7 million in 2024 (2023: CHF 8.9 million). The value of inventories recognized as an expense in direct costs and other operating expenses totalled CHF 226.1 million ( 2023: CHF 217.8 million). No inventories were expected to be sold after more than one year.
OTHER OPERATING ASSETS AND LIABILITIES	OTHER OPERATING ASSETS AND LIABILITIES The details of Sunrise's other current and non-current assets as well as other current and non-current liabilities are set forth below: December 31 2024 2023 CHF in millions Other assets - current: Third party receivables 63.4 120.0 Prepayments 60.8 128.7 Contract assets 14.6 17.3 Contract costs 61.1 53.6 Inventories 58.5 50.1 Other 1.5 6.3 Total 259.9 376.0 Other assets - non-current: Trade receivables 34.3 44.0 Prepayments 82.1 31.7 Contract assets 13.2 14.4 Contract costs 19.2 15.8 Other 11.6 10.5 Total 160.4 116.4 Other liabilities - current: Accrued other liabilities 261.0 335.0 Accrued capital expenditures 63.5 66.9 Accrued payroll and employee benefits 68.3 83.0 Deferred revenue 71.3 66.7 Other 32.9 31.2 Total 497.0 582.8 Other liabilities - non-current: Other 48.2 89.8 Total 48.2 89.8 Write-downs of inventories to the net realizable v alue totalled CHF 0.7 million in 2024 (2023: CHF 8.9 million). The value of inventories recognized as an expense in direct costs and other operating expenses totalled CHF 226.1 million ( 2023: CHF 217.8 million). No inventories were expected to be sold after more than one year.
OTHER OPERATING ASSETS AND LIABILITIES	OTHER OPERATING ASSETS AND LIABILITIES The details of Sunrise's other current and non-current assets as well as other current and non-current liabilities are set forth below: December 31 2024 2023 CHF in millions Other assets - current: Third party receivables 63.4 120.0 Prepayments 60.8 128.7 Contract assets 14.6 17.3 Contract costs 61.1 53.6 Inventories 58.5 50.1 Other 1.5 6.3 Total 259.9 376.0 Other assets - non-current: Trade receivables 34.3 44.0 Prepayments 82.1 31.7 Contract assets 13.2 14.4 Contract costs 19.2 15.8 Other 11.6 10.5 Total 160.4 116.4 Other liabilities - current: Accrued other liabilities 261.0 335.0 Accrued capital expenditures 63.5 66.9 Accrued payroll and employee benefits 68.3 83.0 Deferred revenue 71.3 66.7 Other 32.9 31.2 Total 497.0 582.8 Other liabilities - non-current: Other 48.2 89.8 Total 48.2 89.8 Write-downs of inventories to the net realizable v alue totalled CHF 0.7 million in 2024 (2023: CHF 8.9 million). The value of inventories recognized as an expense in direct costs and other operating expenses totalled CHF 226.1 million ( 2023: CHF 217.8 million). No inventories were expected to be sold after more than one year.
OTHER OPERATING ASSETS AND LIABILITIES	OTHER OPERATING ASSETS AND LIABILITIES The details of Sunrise's other current and non-current assets as well as other current and non-current liabilities are set forth below: December 31 2024 2023 CHF in millions Other assets - current: Third party receivables 63.4 120.0 Prepayments 60.8 128.7 Contract assets 14.6 17.3 Contract costs 61.1 53.6 Inventories 58.5 50.1 Other 1.5 6.3 Total 259.9 376.0 Other assets - non-current: Trade receivables 34.3 44.0 Prepayments 82.1 31.7 Contract assets 13.2 14.4 Contract costs 19.2 15.8 Other 11.6 10.5 Total 160.4 116.4 Other liabilities - current: Accrued other liabilities 261.0 335.0 Accrued capital expenditures 63.5 66.9 Accrued payroll and employee benefits 68.3 83.0 Deferred revenue 71.3 66.7 Other 32.9 31.2 Total 497.0 582.8 Other liabilities - non-current: Other 48.2 89.8 Total 48.2 89.8 Write-downs of inventories to the net realizable v alue totalled CHF 0.7 million in 2024 (2023: CHF 8.9 million). The value of inventories recognized as an expense in direct costs and other operating expenses totalled CHF 226.1 million ( 2023: CHF 217.8 million). No inventories were expected to be sold after more than one year.

LEASING

LEASING	12 Months Ended
	Dec. 31, 2024
Disclosure Of Leases [Abstract]
LEASING	LEASING Sunrise leased assets include telecommunications installations like mobile sites and transmission equipment such as leased lines, shops and offices as well as vehicles. Information about leases for which Sunrise is a lessee is presented below. Right-of-use assets December 31 2024 2023 CHF in millions Distribution systems 1,091.4 1,166.2 Support equipment, buildings and land 171.1 128.0 Total RoU assets 1,262.5 1,294.2 At 31 December 2024 the weighted average discount rate was 5.5% (2023: 5.0%). During 2024, Sunrise recorded additions in RoU assets associated with leases of CHF 126.30 million (2023: CHF 56.20 million), respectively. Lease expenses Year ended December 31 2024 2023 2022 CHF in millions Depreciation and amortization Distribution systems 101.4 99.3 96.3 Support equipment, buildings and land 28.3 28.7 49.1 Total depreciation and amortization 129.7 128.0 145.4 Interest expense 69.8 67.9 65.3 Short-term lease expense 9 2.4 3.2 3.2 Total lease expense 201.9 199.1 213.9 9 Included in operating income before depreciation and amortization. Lease liabilities Maturities of our lease liabilities are presented below: Year ended December 31 2024 2023 CHF in millions Within 1 year 164.1 170.4 Between 1 and 2 years 152.0 153.9 Between 2 and 3 years 148.8 145.5 Between 3 and 4 years 141.3 141.9 Between 4 and 5 years 135.2 135.0 After 5 years 925.7 1,002.2 Total payments 1,667.1 1,748.9 Less: present value discount (447.8) (491.2) Present value of lease payments 1,219.3 1,257.7 Current portion 164.1 170.4 Non-current portion 1,055.2 1,087.3 Cash flows from leases Year ended December 31 2024 2023 CHF in millions Principal payments 114.4 107.6 Interest payments 61.0 58.4 Payments for short-term leases 2.4 3.2 Total payments 177.8 169.2

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	12 Months Ended
	Dec. 31, 2024
Disclosure Of Property, Plant, And Equipment1 [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT Distribution systems Customer premises equipment Support equipment and buildings Assets under construction Total CHF in millions Cost: January 1, 2023 3,060.6 432.3 1,423.3 247.7 5,163.9 Additions 280.5 93.2 3.5 — 377.2 Additions from business combinations 70.7 — 3.0 — 73.7 Retirements and disposals (34.9) (93.3) (2.1) — (130.3) Reclassifications (65.9) (59.2) 25.2 99.9 — December 31, 2023 3,311.0 373.0 1,452.9 347.5 5,484.5 Additions 257.3 100.3 50.4 — 408.0 Retirements and disposals (213.1) (101.0) (25.3) — (339.4) Reclassifications (233.9) (9.6) (6.1) 173.2 (76.4) Other — — — (1.0) (1.0) December 31, 2024 3,121.3 362.7 1,471.9 519.7 5,475.7 Distribution systems Customer premises equipment Support equipment and buildings Assets under construction Total CHF in millions Accumulated depreciation and impairment: January 1, 2023 (2,326.1) (249.0) (291.7) — (2,866.8) Depreciation (290.8) (69.1) (92.6) — (452.5) Retirements and disposals 34.9 93.3 2.4 — 130.6 Reclassifications (47.3) 60.1 (12.8) — — December 31, 2023 (2,629.3) (164.7) (394.7) — (3,188.7) Depreciation (287.1) (67.9) (13.0) — (368.0) Retirements and disposals 213.1 100.7 25.2 — 339.0 Reclassifications — — 65.5 — 65.5 Other 9.8 2.0 3.2 — 15.0 December 31, 2024 (2,693.5) (129.9) (313.8) — (3,137.2) Distribution systems Customer premises equipment Support equipment and buildings Assets under construction Total CHF in millions Property and equipment, net: Net carrying amount at December 31, 2023 681.7 208.3 1,058.2 347.5 2,295.7 Net carrying amount at December 31, 2024 427.8 232.8 1,158.1 519.7 2,338.5 In 2024, software assets with a net carrying amount of CHF10.9m have been reclassified from PP&E to Intangible assets. The capitalization process recognizes all additions to PP&E as "Additions" to Assets under depreciation (Distribution systems, Customer premises equipment, and Support equipment and buildings), which are then reclassified simultaneously into Assets under construction within "Reclassifications", as long as construction or implementation of the underlying projects is ongoing. Once the project has been completed, the final asset is reclassified from Assets under construction to Assets under depreciation within Reclassifications. Due to that process the table above shows negative reclassifications for Assets under depreciation categories.

INTANGIBLE ASSETS

INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2024
Intangible Assets [Abstract]
INTANGIBLE ASSETS	INTANGIBLE ASSETS Changes in the carrying amounts of the intangible assets are as follows: Brands and customers relationships Licenses and rights Software Other intangible assets Total CHF in millions Cost: January 1, 2023 1,972.0 652.1 523.3 18.3 3,165.7 Additions from business combinations 8.4 — — — 8.4 Additions 0.3 — 160.2 — 160.5 Retirements and disposals (27.4) — (48.3) — (75.7) Other 2.5 — — (1.1) 1.4 December 31, 2023 1,955.8 652.1 635.2 17.2 3,260.3 Additions — 2.0 99.9 — 101.9 Retirements and disposals — (153.5) (32.6) (8.0) (194.1) Reclassifications — — 76.4 — 76.4 Other 1.9 — — 3.6 5.5 December 31, 2024 1,957.7 500.6 778.9 12.8 3,250.0 Brands and customers relationships Licenses and rights Software Other intangible assets Total CHF in millions Accumulated amortization: January 1, 2023 (732.3) (252.7) (280.0) (1.6) (1,266.6) Amortization (322.0) (66.8) (143.6) (7.2) (539.6) Retirements and disposals 27.4 — 48.3 — 75.7 Other — — — 0.1 0.1 December 31, 2023 (1,026.9) (319.5) (375.3) (8.7) (1,730.4) Amortization (321.7) (69.0) (155.0) (4.2) (549.9) Retirements and disposals — 153.5 32.6 8.0 194.1 Reclassifications — — (65.5) — (65.5) Other — — (13.9) — (13.9) December 31, 2024 (1,348.6) (235.0) (577.1) (4.9) (2,165.6) Brands and customers relationships Licenses and rights Software Other intangible assets Total CHF in millions Intangible assets subject to amortization, net: Net carrying amount at 31 December 2023 928.9 332.6 259.9 8.5 1,529.9 Net carrying amount at 31 December 2024 609.1 265.6 201.8 7.9 1,084.4 Brands and customer relationships As of 31 December 2024, the most significant intangible assets are the customer base of former Sunrise Communications Group AG with a carrying amount of CHF 575.7 million as well as the Sunrise brand with a carrying amount of CHF 20.5 million. Both assets originated from the acquisition by f ormer UPC GmbH in 2020 (renamed to Sunrise GmbH in 2022). The remaining useful life is 2 years and 6 years, respectively . Licenses and rights As of 31 December 2024, licenses and rights consist primarily of two spectrum licenses. The frequency usage rights acquired in January 2013 are mostly used for 4G. The carrying amount is CHF 120.6 million with a remaining useful life of 4 years. The frequency usage rights acquired in July 2019 are used for 5G. The carrying amount is CHF 56.8 million with a remaining useful life of 10 years. In 2022, Sunrise signed a contract with Swiss Ice Hockey Federation and acquired broadcasting rights for the National League. These broadcasting rights have a carrying amount of CHF 80.0 million with a remaining useful life of 3 years. Software Software mainly includes licenses and developments for Customer Relationship Management ('CRM') and accounting applications with varying remaining useful lives of less than 5 years. In 2024, software assets with a net carrying amount of CHF 10.9m have been reclassified from PP&E to Intangible assets.

GOODWILL

GOODWILL	12 Months Ended
	Dec. 31, 2024
Goodwill [Abstract]
GOODWILL	GOODWILL Goodwill allocation For business combinations, goodwill is allocated as of the transaction date to Sunrise's cash-generating units ('CGUs'). Sunrise's CGUs with allocated goodwill consist of Residential, Business and Wholesale. Residential Business Wholesale Total CHF in millions Cost: January 1, 2023 4,580.7 1,098.3 327.3 6,006.3 Additions from business combinations 6.4 — — 6.4 December 31, 2023 4,587.1 1,098.3 327.3 6,012.7 Additions from business combinations — — — — December 31, 2024 4,587.1 1,098.3 327.3 6,012.7 Residential Business Wholesale Total CHF in millions Goodwill, net: Net carrying amount at 31 December 2023 4,587.1 1,098.3 327.3 6,012.7 Net carrying amount at 31 December 2024 4,587.1 1,098.3 327.3 6,012.7 Impairment tests for goodwill Goodwill is subject to an annual impairment test conducted as of 30 September of each year. In 2024, there were no other recorded intangible assets with indefinite useful lives (2023: CHF 0). The recoverable amount of all CGUs has been determined based on its value-in-use using a discounted cash flow (DCF) method. The key assumptions used are listed below: Key assumptions used in value in use calculations 2024 2023 Long-term growth rate — % 0.6 % WACC (pre-tax) 5.3 % 7.0 % The calculation basis for the DCF model is Sunrise's business plan as approved by the Executive Committee. The detailed planning horizon of the business plan covers five years. The free cash flows beyond the five-year planning period were extrapolated using a long-term growth rate. The discount rate is the weighted average cost of capital ('WACC') before tax of Sunrise. Budgeted gross margin and growth rates are based on past performance and management's expectations of market development. Revenue, as a further key assumption, is estimated using detailed revenue models including market dynamics, expectations for pricing and customer churn rates, amongst others. As of the impairment test date, the recoverable amount for all CGUs was higher than the carrying amount. Sensitivity analysis Management performed the following sensitivity analyses, in isolation: • increased the pre-tax discount rate by 100 basis points (bps), keeping stable other key assumptions • decreased revenue by 500 bps, keeping stable other key assumptions • decreased EBITDA margin by 500 bps, keeping stable other key assumptions The results of the sensitivity analysis demonstrated that the above changes in the key assumptions would not cause the carrying value of CGUs to exceed the recoverable amount for any of the three CGUs.

PROVISIONS

PROVISIONS	12 Months Ended
	Dec. 31, 2024
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]
PROVISIONS	PROVISIONS Asset retirement obligations Restructuring obligations Other provisions Total CHF in millions Provisions as of January 1, 2023 61.4 10.4 — 71.8 Provisions made during the period 2.0 28.5 29.9 60.4 Change in present value 2.5 — — 2.5 Provisions used during the period (1.8) (16.0) — (17.8) Provisions as of December 31, 2023 64.1 22.9 29.9 116.9 Thereof current — 22.9 29.9 52.8 Thereof non-current 64.1 — — 64.1 Provisions as of January 1, 2024 64.1 22.9 29.9 116.9 Provisions made during the period 2.1 1.9 — 4.0 Change in present value 2.4 — — 2.4 Provisions used during the period (4.6) (20.1) (29.9) (54.6) Provisions as of December 31, 2024 64.0 4.7 — 68.7 Thereof current — 4.7 — 4.7 Thereof non-current 64.0 — — 64.0 Provisions for asset retirement obligations relate to the future dismantling of mobile stations and restoration of property owned by third parties. Those leases generally contain provisions that require Sunrise to remove the asset and restore the sites to their original condition at the end of the lease term. The uncertainties relate primarily to the timing of the related cash outflows. The majority of these obligations are not expected to result in cash outflows within a year. Restructuring obligations primarily include the full cost of planned business restructuring programs. These programs are expected to be completed within the next 12 months. Other provisions are related to litigation, and legal claims. Refer to Note 18 for further details on legal contingencies for Sunrise.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2024
Disclosure of commitments and contingencies [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES The total contractual and purchase commitments as of 31 December 2024, amounted to CHF 886.7 million (31 December 2023: CHF 939.3 million) for future investments in property, plant and equipment, right-of-use assets and intangible assets. On 8 December 2017, Sunrise GmbH, formerly known as UPC Schweiz GmbH, entered into a mobile virtual network operator ('MVNO') agreement with Swisscom (Schweiz) AG ('Swisscom'), as subsequently amended (the 'Swisscom MVNO'), for the provision of mobile network services to certain of Sunrise GmbH’s end customers. In January 2023, Swisscom filed a formal lawsuit against Sunrise GmbH, asserting that it is in breach of the Swisscom MVNO and claiming approximately CHF 90 million in damages. In April 2024, Sunrise agreed with Swisscom to resolve the matter, the terms of which are not material to us and, as a result, the lawsuit against Sunrise GmbH has been withdrawn. In addition, Sunrise has significant commitments under (i) derivative instruments and (ii) defined benefit plans and similar agreements, pursuant to which we expect to make payments in future periods. For information regarding derivative instruments, including the net cash paid or received in connection with these instruments, see Note 24. For information regarding Sunrise's defined benefit plan, see Note 10. Sunrise also has commitments pursuant to agreements with, and obligations imposed by, authorities, which may include obligations in certain markets to move aerial cable to underground ducts or to upgrade, rebuild or extend portions of Sunrise's broadband communication systems. Such amounts are not fixed or determinable. On 5 March 2012, Sunrise GmbH was party to a dispute with Swisscom related to rates for interconnection, unbundled local loop ('ULL'), collocation, rebilling, leased lines and access to duct. On 25 August 2023, Swisscom made a non-prejudicial down payment for the unopposed portion in the amount of CHF 18.8 million (including VAT) of the total recovery. For this part, where the cash payment was received, the gain contingency was concluded as realized and undisputed, respectively. In Q3 2023, a gain contingency in the amount of CHF 17.2 million was recorded in other income. In November 2023, Sunrise recorded a provision of CHF 29.1 million due to an ice-hockey broadcasting rights penalty issued by the Competition Commission. During the 12-month period ended 31 December 2024 Sunrise settled CHF 29.3 million related to this penalty. Sunrise is party to certain pending lawsuits and cases with public authorities and complaint boards. Based on a legal assessment of the possible outcome of each of these lawsuits and cases, management is of the opinion that these will have no significant adverse effect on Sunrise’s statement of financial position. Under the terms of the financing documents, certain entities of Sunrise are guarantors. For the financial years ending 31 December 2024 and 31 December 2023, the maximum guarantee totals the value of shares and intercompany receivables.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2024
Income Taxes [Abstract]
INCOME TAXES	INCOME TAXES Income tax expense Year ended December 31 2024 2023 2022 CHF in millions Current income tax expense (20.6) (17.3) (6.5) Current income tax benefit (expense) of prior periods (19.2) 1.0 0.2 Deferred income tax benefit 56.5 76.2 57.0 Total income tax benefit 16.7 59.9 50.7 Current and deferred income taxes are recognized by each consolidated entity of Sunrise, regardless of who has the legal liability for settlement or recovery of the tax. Current tax liabilities For the period 2023 the current tax liabilities presented in the consolidated financial statements related to the Dutch Sunrise financing companies. The current tax expense generated up until spin-off in 2024 (including the 2023 current tax liability for the Dutch Sunrise financing company) has been presented as being settled with the tax authorities. The settlement is presented with no cash impact on the consolidated statements of financial position and as such is deemed to have been funded by a capital contribution from Liberty Global B.V. via equity as per spin-off date. Analysis of income taxes Sunrise's tax rate reconciliation is based on the domestic tax rate of the main operating company domiciled in Switzerland, with a reconciling item in respect of the tax rates applied by Sunrise companies in other jurisdictions. This tax rate is used because Sunrise’s operational activities are mainly carried out in Switzerland and therefore provides the most meaningful information for the user of the consolidated financial statements. The use of Sunrise’s weighted average tax rate based on the aggregation of the separate reconciliations of each individual jurisdiction/entity would result in a highly biased and therefore less meaningful expected tax rate due to the volatile results of the Dutch companies. Year ended December 31 2024 2023 2022 CHF in millions Income (loss) before income taxes (378.5) (372.1) 33.3 Domestic income tax rate 18.3 % 18.4 % 18.4 % Expected income tax income/(expense) 69.4 68.4 (6.1) Effect of income taxed at differing tax rates 5.0 (3.7) (39.8) Non-deductible items (18.4) (9.9) (1.0) Non-taxable income — 0.1 0.9 Effect of changes in recognition of deferred tax assets (0.6) 3.2 92.3 Adjustments to deferred tax balances arising from tax rate changes — 0.5 3.3 Adjustments recognized for current and deferred tax of prior periods (40.3) 1.0 0.3 Other effects 1.6 0.3 0.8 Total income tax benefit 16.7 59.9 50.7 In the current period, Sunrise has reached a settlement with the tax authorities regarding the ongoing tax audit. As a result, Sunrise has recognized current and deferred taxes for prior year taxes in the current period for the financial years 2020 - 2023, resulting in a reconciling item in the tax rate reconciliation. The non-tax-deductible expenses include the current year effect of the settlement. Deferred tax assets and liabilities Deferred tax assets and liabilities by origin of the temporary difference: December 31, 2024 Assets Liabilities CHF in millions Intangible assets — 135.2 Property, plant and equipment — 34.2 Unrealized foreign exchange results 26.5 — Derivatives — 4.8 Receivables — 3.9 Right-of-use assets 20.4 — Deferred revenue 0.1 20.1 Employee benefit obligations 1.4 — Provisions 8.9 0.3 Lease liabilities — 1.0 Other 0.1 0.4 Tax net operating loss carry forward 0.4 — Total 57.8 199.9 Netting of deferred tax assets and liabilities 34.2 (34.1) Reflected in the consolidated statements of financial position as follows: Deferred tax assets 23.6 — Deferred tax liabilities — 165.8 December 31, 2023 Assets Liabilities CHF in millions Intangible assets — 195.7 Property, plant and equipment — 43.5 Unrealized foreign exchange results — 206.9 Derivatives — 0.1 Receivables 0.1 — Right-of-use assets 19.3 — Deferred revenue 0.1 12.7 Employee benefit obligations 1.4 — Provisions 3.3 3.7 Lease liabilities — 0.3 Other — 0.4 Tax net operating loss carry forward 232.4 — Total 256.6 463.3 Netting of deferred tax assets and liabilities 256.6 (256.6) Reflected in the consolidated statements of financial position as follows: Deferred tax liabilities — 206.7 Net change in deferred tax assets and liabilities 2024 2023 2022 CHF in millions Opening balance at the beginning of the period January 1 206.7 294.7 351.0 Changes recognized in the consolidated statements of income or loss (56.6) (76.2) (57.0) Changes recognized in the consolidated statements of comprehensive income or loss (1.2) (5.4) 1.8 Changes recognized in the consolidated statements of changes in equity (7.9) (8.9) (1.1) Change in scope of consolidation / goodwill adjustment — 3.7 Foreign currency effects 1.2 (1.2) Closing balance at the end of the period December 31 142.2 206.7 294.7 The change in the deferred tax position is mainly recognized in the consolidated statements of income or loss. The changes via the consolidated statements of comprehensive income or loss mainly relate to deferred taxes in connection with IAS 19. The changes directly recorded in equity are based on capital contributions with different accounting recognition under IFRS and tax base, see Note 20. Temporary differences associated with investments Deferred tax liabilities are recognized in respect of investments in subsidiaries, branches and associates, and interest in joint arrangements, except to the extent that Sunrise can control the timing of the reversal of the associated taxable temporary difference, and it is probable that such will not reverse in the foreseeable future. Due to the existing double taxation agreement between Switzerland and the Netherlands, any distributions have no direct tax consequences. Furthermore, dividend income is exempt from direct income taxes in the Netherlands. Therefore, as of 31 December 2024, and 31 December 2023, this exception was not considered to apply to any taxable differences. Unrecognized deferred tax assets on tax loss carryforwards As of 31 December 2024 and 31 December 2023 Sunrise has the following unused tax loss carryforwards for which no deferred tax assets are recognized: December 31 2024 2023 CHF in millions Due to expire within 1 year — — Due to expire within 2 to 7 years 16.5 — Due to expire in more than 7 years — — Amount not due to expire — 109.4 Total 16.5 109.4 CHF 109.4 million remained with LG as per spin-off (as mentioned above). Unrecognized deferred tax assets on deductible temporary differences In the current period there are no deductible temporary differences for which no deferred tax asset has been recognized (2023: CHF 967.4 million). Other disclosures OECD Pillar Two Model Rules (Global minimum tax) Sunrise falls under the scope of application of the OECD minimum tax. The global minimum tax regulations provide for payment of an additional tax to account for the difference between the effective Global Anti Base Erosion ('GloBE') tax rate per country and the minimum rate of 15%. Switzerland adopted new legislation introducing the global minimum tax in December 2023 that entered into force on 1 January 2024. Sunrise does not expect the minimum tax to have any impact on its activities in Switzerland, as the effective tax rate is more than 15%. The same applies to the other countries in which Sunrise operates. Sunrise is keeping an eye on developments in the minimum tax regulations and is assessing their impact on Sunrise on an ongoing basis. Sunrise applies the exception to recognizing and disclosing information about deferred income tax assets and liabilities in connection with income taxes related to minimum tax, as provided in the amendments to IAS 12 published in May 2023.

EQUITY

EQUITY	12 Months Ended
	Dec. 31, 2024
Equity [abstract]
EQUITY	EQUITY Ordinary share capital Authorized ordinary share capital consists of 69,759,702 authorized Class A shares with a par value of CHF 0.10, of which 68,858,888 are issued and outstanding as at 31 December 2024 (2023: 194), and 25,977,316 authorized Class B shares with a par value of CHF 0.01. Treasury shares After the spin-off, Sunrise acquired 1,000,000 class A common shares for CHF 100,000 from Liberty Global Ltd., with 99,186 of these shares being used to fulfill share-based compensation obligations. Other reserves This caption includes capital contributions from / distributions to related parties, share-based compensation related charges and distributions as well as Sunrise's accumulated losses. During 2022, Sunrise received net capital contributions from Liberty Global Europe Holding BV of CHF 955.8 million. The capital contributions were used to (a) partially repay outstanding principal and interest on the UPCB Finance VII Euro Notes, the UPC Holding 3.875% Senior Notes, the UPC Holding 5.5% Senior Notes, and Facilities AX and AY of the Sunrise Holding Bank Facility and (b) settle associated derivative instruments. The residual amount is mainly related to distributions recognized in connection with the exercise or vesting of stock-based compensation incentive awards. The capital charges in 2023 include distributions of CHF 50.9 million from a change in a service agreement related to technology and innovation services and a capital contribution of CHF 6.1 million related to the Dutch Sunrise Finco's current tax liability (see Note 19). The residual amount is mainly related to distributions recognized in connection with the exercise or vesting of stock-based compensation incentive awards. The capital charges in 2024 are mainly related to the reorganization transactions due to the spin-off execution. Sunrise received capital contributions from Liberty Global Europe Holding BV of CHF 1,106.2 million. The capital contributions were used for partial repayment of Sunrise's external debt. Further contributions from LG of 25.1 million related to the Dutch Sunrise Finco's current tax liability (see Note 19). The residual amount is mainly related to distributions recognized in connection with the exercise or vesting of stock-based compensation incentive awards. Currency translation reserve The currency translation reserve is used to record cumulative translation differences on the net assets of foreign operations. The cumulative translation differences will be recycled to the consolidated statements of comprehensive income or loss upon disposal of the foreign operations. Actuarial gains or losses from defined benefit plans Actuarial gains or losses from defined benefit plans include the pension reserve.

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2024
Earnings per share [abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE The earnings per share calculation uses the weighted average number of shares in issue during the year. For the weighted average number of shares outstanding in periods prior to spin-off, the share amount distributed at spin-off net of treasury shares was used. The equity awards granted but not yet vested do not impact the diluted earnings per share, as the effect is anti-dilutive for 2024 due to Sunrise's net loss for the financial year. For the years 2023 and 2022 the number of outstanding shares for both the undiluted and diluted EPS are also identical, as Sunrise did not have any outstanding grants in those years. Year ended December 31, 2024 Class A Class B Allocation of net income (loss) attributable to Sunrise share classes (in CHF million) (352.7) (13.1) Weighted average number of shares outstanding 69,619,207 25,977,316 Adjusted weighted average of shares outstanding 69,619,207 25,977,316 Basic and diluted earnings (loss) per share (in CHF) (5.1) (0.5) Year ended December 31, 2023 Class A Class B Allocation of net income (loss) attributable to Sunrise share classes (in CHF million) (304.8) (11.3) Weighted average number of shares outstanding 69,759,702 25,977,316 Adjusted weighted average of shares outstanding 69,759,702 25,977,316 Basic and diluted earnings (loss) per share (in CHF) (4.4) (0.4) Year ended December 31, 2022 Class A Class B Allocation of net income (loss) attributable to Sunrise share classes (in CHF million) 77.6 2.9 Weighted average number of shares outstanding 69,759,702 25,977,316 Adjusted weighted average of shares outstanding 69,759,702 25,977,316 Basic and diluted earnings (loss) per share (in CHF) 1.1 0.1 The number of shares outstanding is shown in absolute units below, rather than time-weighted units. 2024 Class A Class B Shares distributed as of spin date 69,759,702 25,977,316 Less treasury shares (1,000,000) - Shares distributed from treasury shares 99,186 - Shares Outstanding as of December 31 68,858,888 25,977,316 The table below shows all potential ordinary shares, including those equity awards which are excluded from the calculation of the diluted earnings per share due to their anti-dilutive impact. The PSU plans shown below would not be included due to the performance condition not yet being achieved, however they are displayed below to give a holistic overview of potential dilution in the future. The table below shows absolute units, rather than the 2024 time-weighted units. 2024 PSU plans 421,608 RSU plans 399,399 SAR plans 461,244 Legacy LG RSU plans 1,402,510 Potential ordinary shares of Class A 2,684,761 For LG RSU awards granted before the spin-off, holders of Legacy LG RSU plans will receive Sunrise RSUs at the same ratio per RSU as the distribution of Sunrise Class A common shares to Liberty Global Class A common shareholders during the spin-off. These are referred to as "True-Up Sunrise RSUs" in the F-4 filing.

FINANCIAL INCOME AND EXPENSES

FINANCIAL INCOME AND EXPENSES	12 Months Ended
	Dec. 31, 2024
Financial Income And Expenses [Abstract]
FINANCIAL INCOME AND EXPENSES	FINANCIAL INCOME AND EXPENSES December 31 2024 2023 2022 CHF in millions Finance expenses: Interest expense (432.9) (431.1) (338.5) Losses on debt modification and extinguishment (4.0) (0.1) — Realized and unrealized losses on derivative instruments — (524.5) — Foreign currency transaction losses (295.2) — — Gains (losses) due to changes in fair values of certain investments and debt, net (6.1) — — Other expense, net (4.4) (1.5) (1.7) Total (742.6) (957.2) (340.2) Finance income: Interest income 8.1 3.0 1.5 Realized and unrealized gains on derivative instruments 249.6 — 348.4 Foreign currency transaction gains — 568.6 2.8 Gains (losses) due to changes in fair values of certain investments and debt, net — 3.1 104.0 Total 257.7 574.7 456.7

BORROWINGS

BORROWINGS	12 Months Ended
	Dec. 31, 2024
Borrowings1 [Abstract]
BORROWINGS	BORROWINGS The CHF equivalents of the components of third-party debt are as follows: December 31, 2024 Principal amount Weighted average interest rate (%) 10 Unused borrowing capacity December 31 December 31 2024 2023 CHF in millions Sunrise holding bank facility 6.64% 662.0 2,239.0 3,043.3 Sunrise holding SPE notes 4.58% 1,468.8 1,397.1 Sunrise holding senior note 4.80% 629.3 693.3 Vendor financing 3.08% 350.0 310.1 Total third-party debt before deferred financing costs, discounts, premiums and accrued interest 5.48% 662.0 4,687.1 5,443.8 10 Represents the weighted average interest rate in effect at 31 December 2024 for all borrowings outstanding pursuant to each debt instrument, including any applicable margin. The interest rates presented represent stated rates and do not include the impact of derivative instruments, deferred financing costs, original issue premiums or discounts and commitment fees, all of which affect our overall cost of borrowing. Including the effects of derivative instruments, original issue premiums or discounts and commitment fees, but excluding the impact of deferred financing costs, the weighted average interest rate on our aggregate third-party variable- and fixed-rate indebtedness was 3.0% at 31 December 2024. The weighted average interest rate calculation includes principal amounts outstanding associated with all of our secured and unsecured borrowings. For information regarding our derivative instruments, see note 24. The following table provides a reconciliation of total third-party debt before deferred financing costs, discounts, premiums and accrued interest to total debt including interest and related party debt: December 31 2024 2023 CHF in millions Total third-party debt before deferred financing costs, discounts, premiums and accrued interest: 4,687.1 5,443.8 Deferred financing costs, discounts and premiums, net (10.3) (18.1) Total carrying amount of third-party debt 4,676.8 5,425.7 Accrued interest on third-party debt 57.4 60.4 Related party debt (note 26) — 51.2 Total debt including interest and related party debt 4,734.2 5,537.3 Current portion of debt 407.4 370.5 Non-current portion of debt 4326.8 5166.8 Sunrise holding bank facility The Sunrise holding bank facility is the senior secured credit facility of certain consolidated entities of Sunrise. The details of Sunrise's borrowings under the Sunrise holding bank facility are summarized in the following tables: Year ended December 31, 2024 Sunrise Holding Bank facilities Maturity Interest rate Facility amount (in borrowing currency) Outstanding principal amount Unused borrowing capacity Carrying value in millions CHF millions AT April 30, 2028 Term SOFR +2.4% US$700.0 635.4 — 633.8 AU April 30, 2029 EURIBOR +2.5% € 400 375.8 — 374.7 AX January 31, 2029 Term SOFR +3.0% US$1,044.7 948.3 — 944.0 AY January 31, 2029 EURIBOR +3.0% € 297.6 279.6 — 278.8 Revolving Facility A May 31, 2026 EURIBOR +2.5% € 10 — 9.4 — Revolving Facility B September 30, 2029 EURIBOR +2.5% € 720 — 652.6 — Total 2,239.0 662.0 2,231.2 Year ended December 31, 2023 Sunrise Holding Bank Facilities Maturity Interest rate Facility amount (in borrowing currency) Outstanding principal amount Unused borrowing capacity Carrying value in millions CHF millions AT April 30, 2028 Term SOFR +2.25% US$700.0 587.4 — 585.6 AU April 30, 2029 EURIBOR +2.5% € 400.0 371.4 — 370.1 AX January 31, 2029 Term SOFR +3.0% US$1,717.0 1,441.0 — 1,432.8 AY January 31, 2029 EURIBOR +3.0% € 693.0 643.5 — 641.0 Revolving Facility A May 31, 2026 EURIBOR +2.5% € 88.0 — 60.4 — Revolving Facility B September 30, 2029 EURIBOR +2.5% € 660.0 — 612.8 — Total 3,043.3 673.2 3,029.5 The Sunrise Holding Revolving Facility provides for maximum borrowing capacity of CHF 685.8 million, including CHF 56.4 million under the related ancillary facility. With the exception of CHF 23.8 million of borrowings under the ancillary facility (which are blocked as financial guarantees), the Sunrise Holding Revolving Facility was undrawn at 31 December 2024. During 2023, the Sunrise holding bank facility was amended to replace LIBOR with the Term Secured Overnight Financing Rate ('Term SOFR') as the reference rate for US dollar-denominated loans. The facilities are subject to a floor of 0.0% of their respective reference rate. Besides, facility AY's rates are subject to adjustment based on the achievement or otherwise of certain Environmental, Social and Governance ('ESG') metrics. Unused borrowing capacity represents the maximum availability under the Sunrise holding bank facility at 31 December 2024 without regard to covenant compliance calculations or other conditions. In April 2024, Revolving Facility B was amended to include an ESG-linked margin ratchet. The interest rate on Revolving Facility B is now subject to adjustment based on the achievement or otherwise of certain ESG metrics. Subject to certain customary and agreed exceptions, the Sunrise holding bank facility contains certain restrictions which, among other things, restrict the ability of the borrower to (i) incur or guarantee certain financial indebtedness, (ii) make certain disposals and acquisitions, (iii) create certain security interests over their assets and (iv) make certain restricted payments to Sunrise through dividends, loans or other distributions. Financing transactions On 31 October 2024, Sunrise entered into a series of debt and repayment transactions, related to the spin-off (see Note 1). The transactions included the partial repayment of Term Loans AX and AY at par value. Additionally, selected Senior Secured Notes (SSNs), including USD 5.5%, EUR 3.875%, and USD 4.875% notes, were repurchased at either a discount or a premium, depending on market conditions, and subsequently cancelled. Accrued and unpaid interest on all instruments was settled as of the repayment date. Sunrise holding SPE notes From time to time, Sunrise creates special purpose financing entities ('Sunrise Holding SPEs'), some of which are owned by third parties (Third-Party SPEs). These Sunrise Holding SPEs are created for the primary purpose of facilitating the offering of senior secured notes, which Sunrise collectively refers to as "Sunrise holding SPE notes". The Sunrise Holding SPEs use the proceeds from the issuance of the relevant Sunrise holding SPE notes to fund term loan facilities under the Sunrise holding bank facility made available to the relevant borrowing entity ('Funded Facilities'). Sunrise consolidates the Sunrise Holding SPEs and eliminates the amounts outstanding under the Funded Facilities in its consolidated financial statements. The details of the Sunrise holding SPE notes are summarized in the following tables: Year ended December 31, 2024 Outstanding principal amount Sunrise holding SPE notes Maturity Interest rate Original issue amount Borrowing currency CHF equivalent Carrying value CHF in millions 2031 Sunrise holding senior secured notes July 15, 2031 4.88% US$1,250.0 US$1,230.0 1,116.6 1,115.9 UPCB finance VII euro notes June 15, 2029 3.63% € 600.0 € 374.9 352.2 351.3 Total 1,468.8 1,467.2 Year ended December 31, 2023 Outstanding principal amount Sunrise holding SPE notes Maturity Interest rate Original issue amount Borrowing currency CHF equivalent Carrying value CHF in millions 2031 Sunrise holding senior secured notes July 15, 2031 4.88% US$1,250.0 US$1,250.0 1,049.0 1,048.0 UPCB finance VII euro notes June 15, 2029 3.63% € 600.0 € 374.9 348.1 346.8 Total senior secured notes 1,397.1 1,394.8 The Sunrise holding SPE notes are non-callable prior to their respective call date (as specified under the applicable indenture). If, however, at any time prior to the applicable call date, all or a portion of the loans under the related Funded Facility are voluntarily prepaid (an 'SPE Early Redemption Event'), then the Sunrise Holding SPE will be required to redeem an aggregate principal amount of its respective Sunrise holding SPE notes equal to the aggregate principal amount of the loans prepaid under the relevant Funded Facility. In general, the redemption price payable will equal 100% of the principal amount of the applicable Sunrise holding SPE notes to be redeemed and a "make-whole" premium, which is the present value of all remaining scheduled interest payments to the applicable call date using the discount rate as of the redemption date plus a premium (as specified in the applicable indenture). Upon the occurrence of an SPE Early Redemption Event on or after the applicable call date, the Sunrise Holding SPE will redeem an aggregate principal amount of its respective Sunrise holding SPE notes equal to the principal amount prepaid under the related Funded Facility at a redemption price (expressed as a percentage of the principal amount) plus accrued and unpaid interest and additional amounts (as specified in the applicable indenture), if any, to the applicable redemption date. Sunrise holding senior notes Sunrise has issued certain senior notes that rank equally with all of the existing senior debt of such issuer and are senior to all existing subordinated debt of such issuer and which are secured by a pledge over the shares of Sunrise HoldCo IV. In addition, the indentures governing Sunrise's senior notes contain customary incurrence-based covenants such as compliance with certain consolidated net leverage ratios, as well as restrictions with regard to the ability to sell certain assets. Also,in the case of a change of control, Sunrise must repurchase the relevant notes at a redemption price of 101%. Covenants are tested on a quarterly basis. The details of the Sunrise holding senior notes are summarized in the following tables: Year ended December 31, 2024 Outstanding principal amount Sunrise Notes Maturity Interest rate Original issue amount Borrowing currency CHF equivalent Carrying value CHF in millions 3.875% senior notes June 15, 2029 3.88% € 635.00 € 287.9 270.4 269.9 5.50% senior notes January 14, 2028 5.50% US$550.0 US$395.3 358.9 358.1 Total 629.3 628.0 Year ended December 31, 2023 Outstanding principal amount Sunrise holding senior notes Maturity Interest rate Original issue amount Borrowing currency CHF equivalent Carrying value CHF in millions 3.875% senior notes June 15, 2029 3.875% € 635.0 € 337.9 313.7 312.8 5.50% senior notes January 14, 2028 5.500% US$550.0 US$452.3 379.6 378.5 Total 693.3 691.3 Vendor financing

FINANCIAL INSTRUMENTS & RISK

FINANCIAL INSTRUMENTS & RISK	12 Months Ended
	Dec. 31, 2024
Financial Instruments [Abstract]
FINANCIAL INSTRUMENTS & RISK	FINANCIAL INSTRUMENTS & RISK Financial risk management Sunrise operates a centralized risk management system that distinguishes between strategic and operating risks. Sunrise's overall risk management programme focuses on the unpredictability of financial market risks and seeks to minimize potential adverse effects on Sunrise's financial condition or performance. All identified risks are quantified (according to their realization probability and impact) and noted on a risk schedule. Sunrise is exposed to a variety of financial risks, namely market risk, credit risk and liquidity risk. Financial risk management is governed by policies approved by key management personnel. These policies provide guidelines for overall risk management as well as specific areas such as interest rate risk. Foreign currency exposures Substantially all of Sunrise's debt is in currencies other than the Swiss franc (see Note 22 for additional information). Therefore, Sunrise's policy is to provide for an economic hedge against foreign currency exchange rate movements by using derivative instruments to synthetically convert unmatched debt into the applicable underlying currency. The following table shows the impact of a possible change in the Euro and the US dollar against the Swiss franc, all other variables held constant before the impact of economic hedging against foreign currency exchange rate movements. The impact on Sunrise's profit before tax is mainly driven by foreign exchange gains/losses of Euro- and US dollar- denominated cash and cash equivalents, trade and other receivables as well as trade, borrowing and other payables. As of 31 December 2024 and 31 December 2023, Sunrise has no other material exposure to foreign currencies. Foreign currency sensitivity December 31 Effect on profit before tax Changes in % 2024 2023 CHF in millions EUR/CHF 10 177.4 279.1 USD/CHF 10 380.4 477.8 Interest rate risk Sunrise is exposed to changes in interest rates primarily as a result of its borrowing activities, which include fixed-rate and variable-rate borrowings by its subsidiaries. Sunrise's interest rate risk mainly arises from borrowings primarily under the Sunrise Holding Bank Facility, which are indexed to EURIBOR, Secured Overnight Financing Rate ('SOFR'), Term Secured Overnight Financing Rate ('Term SOFR'), Swiss Average Rate Overnight ('SARON') or other base rates. In general, Sunrise enters into derivative instruments to protect against increases in the interest rates on variable-rate debt. An instantaneous increase/decrease in the relevant base rate of 10 basis points would have increased/decreased the aggregate fair value of Sunrise's interest rate derivatives by approximately CHF 13.0 million (2023: CHF 20.5 million). Such a movement would be predominantly offset by gains or losses on interest expense. Capital management and liquidity risk Sunrise's objectives in managing capital are to secure its ongoing financial needs, to continue as a going concern, to meet its financial targets, to provide returns to its shareholder and to maintain a cost efficient and risk-optimized capital structure. Sunrise's managed capital structure consists of equity (as disclosed in Note 20), c urrent and non-current borrowings (see Note 23) les s cash and cash equivalents. In order to maintain this capital structure, Sunrise manages its liquidity to ensure its ability to service its borrowings. Liquidity risk arises when there is difficulty in Sunrise meeting its financial obligations. In addition to cash and cash equivalents, the primary sources of liquidity are cash provided by operations and access to the available borrowing capacity of various debt facilities. Sunrise uses budgeting and cash flow forecasting tools to ensure that there are sufficient resources to meet its liquidity requirements on a timely basis. Further, Sunrise also maintains a liquidity reserve to provide for unanticipated cash outflows. Cash flow forecasting is performed by the Sunrise treasury function. Rolling forecasts of Sunrise's liquidity requirements are established on a regular basis to ensure sufficient cash is available to meet operational needs and to honour Sunrise's obligations under its financing arrangements, including the maintenance of borrowing limits and covenant compliance . The table below summarizes the maturity profile of Sunrise's financial liabilities based on contractual undiscounted cash outflows (inflows). All interest payments and repayments of financial liabilities are based on contractual agreements. Interest payments are determined using zero-coupon rates. For floating rate instruments, the calculation is computed using the base rate and applicable margin prevailing as of 31 December 2024. December 31, 2024 <1 year Between 1 and 2 years Between 2 and 5 years Over 5 years Total CHF in millions Trade payables and other payables 741.7 14.7 15.0 15.0 786.4 Borrowings – notional — — 3,220.6 1,116.5 4,337.1 Borrowings – interest 246.1 484.2 360.8 54.4 1,145.5 Lease liabilities (undiscounted) 164.1 152.0 425.3 925.7 1,667.1 Derivatives 175.7 127.7 9.2 — 312.6 Undrawn borrowing facilities As part of the senior facilities agreement Sunrise benefits from a multi-currency revolving credit facility with a total commitment equal to CHF 685.8 million (2023: CHF 694.6 million). Of this amount CHF 56.4 million ( 2023 : CHF 21.4 million) is available as an ancillary facility. With the exception of CHF 23.8 million (2023: CHF 21.4 million) of borrowings under the ancillary facility (which are blocked as financial guarantees) , the UPC Revolving Facility was undrawn at each financial year end. Credit risk Credit risk arising from supplying telecommunications services is managed by assessing the credit quality of the customer, considering its financial position, past experience, payment history and other factors. Sunrise periodically assesses the financial reliability of its customers and their credit limits. Sunrise is exposed to the risk that the counterparties to their derivative instruments and cash holdings will default on their obligations. In this regard, credit risk associated with derivative instruments is spread across a relatively broad counterparty base of banks and financial institutions. Collateral is generally not posted by either party under the derivative instruments. Concentrations of credit risk with respect to trade receivables and contract assets are limited due to the nature of Sunrise's business with very low customer concentration. At 31 December 2024, Sunrise’s exposure to counterparty credit risk included (i) derivative assets with an aggregate fair value o f CHF 0.19 million, (ii) trade receivables of CHF 387.3 million and (iii) cash and cash equivalents and restricted cash of CHF 352.4 million. Allowance for expected credit losses The development of the allowance for expected credit losses of trade receivables for the indicated periods is set forth below: 2024 2023 CHF in millions Allowance at January 1 (30.6) (22.2) Provisions for impairment of trade receivables (30.8) (15.6) Write-off of receivables 29.5 7.2 Allowance at December 31 (31.9) (30.6) The detailed aging of Sunrise's trade receivables and the related allowance for expected credit losses is set forth below: December 31, 2024 Current 1-30 days (overdue) 31-60 days 61-90 days 91-120 days 121-365 days Over 365 days Total Trade receivables gross 153.8 100.9 15.7 12.7 6.2 38.2 — 327.5 Trade receivable gross - Aging % 47.0 % 30.8 % 4.8 % 3.9 % 1.9 % 11.7 % — % 100.0 % Trade receivables - affiliates 0.2 Allowance for doubtful accounts (1.0) (0.9) (2.4) (1.8) (1.7) (24.1) — (31.9) Allowance for doubtful accounts - Aging % 3.1 % 2.8 % 7.6 % 5.6 % 5.3 % 75.6 % — % 100.0 % Trade receivables - Provision % 0.6 % 0.9 % 15.4 % 14.2 % 27.3 % 63.1 % — % 9.7 % Unbilled revenue 57.2 Current trade receivables, net 353.0 Non-current trade receivables gross 34.3 — 34.3 Non-current trade receivables gross - Aging % 100.0 % — % — % — % — % — % — % 100.0 % Non-current trade receivables, net 34.3 December 31, 2023 Current 1-30 days (overdue) 31-60 days 61-90 days 91-120 days 121-365 days Over 365 days Total Trade receivables gross 227.2 42.2 22.4 10.1 9.7 66.4 — 378.0 Trade receivable gross - Aging % 60.1 % 11.2 % 5.9 % 2.7 % 2.6 % 17.6 % — % 100.0 % Trade receivables - affiliates (0.1) Allowance for doubtful accounts (0.8) (0.6) (2.1) (1.4) (1.1) (24.6) — (30.6) Allowance for doubtful accounts - Aging % 2.5 % 1.8 % 6.9 % 4.4 % 3.5 % 80.8 % — % 100.0 % Trade receivables - Provision % 0.3 % 1.3 % 9.4 % 13.4 % 11.0 % 37.2 % — % 8.1 % Unbilled revenue 43.6 Current trade receivables, net 390.9 Non-current trade receivables gross 44.0 — — — — — — 44.0 Non-current trade receivables gross - Aging % 100.0 % — % — % — % — % — % — % — % — % — % — % — % 100.0 % Non-current trade receivables, net 44.0 Trade receivables are non-interest bearing and are generally collected within one year. When a trade receivable is determined to be uncollectible, it is written off against the allowance account. The allowance for expected credit losses of trade receivables is included within other operating items in the consolidated statements of income or loss. Fair value estimation The fair value of Sunrise's debt instruments are generally determined using the average of applicable bid and ask prices. The fair value of financial instruments that are not traded in an active market is determined by using valuation techniques. These valuation techniques maximize the use of observable market data where available and rely as little as possible on entity-specific estimates. If all significant inputs required to calculate the fair value of an instrument are observable, the instrument is included in Level 2. For assets and liabilities that are recognized in the financial statements at fair value on a recurring basis, Sunrise determines whether transfers have occurred between levels in the hierarchy by re-assessing categorization (based on the lowest level input that is significant to the fair value measurement as a whole) at the end of each reporting period. There were no transfers between the different hierarchy levels in 2024 and 2023. The fair values of financial assets and financial liabilities are summarized in the following table. Not included therein are certain financial assets and liabilities whose carrying amount corresponds to a reasonable estimation of their fair value, measured at amortized cost. These include cash and cash equivalents, trade receivables, accrued liabilities, lease liabilities and trade payables, as well as other receivables and liabilities whose carrying amount corresponds to a reasonable estimation of their fair value. December 31, 2024 December 31, 2023 Fair value level Carrying amount Fair value Carrying amount Fair value Current assets carried at FVTPL Derivative financial instruments II 162.5 162.5 237.0 237.0 Non-current assets carried at FVTPL Derivative financial instruments II 5.1 5.1 90.6 90.6 Non-current assets carried at amortized cost Related party long-term receivables II — — 202.5 202.5 Total financial assets 167.6 167.6 530.1 530.1 Current liabilities carried at FVTPL Derivative financial instruments II 179.3 179.3 179.7 179.7 Current liabilities carried at amortized cost Vendor financing II 350.0 350.0 310.1 310.1 Accrued interest II 57.4 57.4 60.4 60.4 Non-current liabilities carried at FVTPL Derivative financial instruments II 421.1 421.1 755.1 755.1 Non-current liabilities carried at amortized cost Third-party debt I 4,326.8 4,085.8 5,115.6 4,944.4 Related party long-term payables II — — 51.2 51.2 Total financial liabilities 5,334.6 5,093.6 6,472.1 6,300.9 Reconciliation of movements in liabilities to cash flows from financing activities Debt and accrued interest Derivative (assets)/liabilities Lease liabilities Total CHF in millions Balance as of January 1, 2024 5,537.3 607.3 1,257.6 7,402.2 Cash flows from financing activities: Interest paid (359.2) — (61.0) (420.2) Vendor financing additions 363.4 — — 363.4 Repayments of debt and lease liabilities (1,064.7) — (114.4) (1,179.1) Principal payments on operating-related vendor financing (327.9) — — (327.9) Principal payments on capital-related vendor financing (49.1) — — (49.1) Net cash received related to derivative instruments — 52.3 — 52.3 Total cash flows from financing activities (1,437.5) 52.3 (175.4) (1,560.6) Losses on debt extinguishment 3.9 — — 3.9 Realized and unrealized (gains) losses on derivative instruments, net — (249.6) — (249.6) Interest accruals 358.2 — 69.8 428.0 Assets acquired under leases — — 126.3 126.3 Assets acquired under capital-related vendor financing arrangements, including VAT 52.1 — — 52.1 Effect of changes in foreign exchange rates 271.8 15.6 — 287.4 Other related party charges (51.8) — — (51.8) Other changes 0.2 7.3 (59.0) (51.5) Balance as of December 31, 2024 4,734.2 432.9 1,219.3 6,386.4 Debt and accrued interest Derivative (assets)/liabilities Lease liabilities Total CHF in millions Balance as of January 1, 2023 5,942.1 (15.5) 1,347.9 7,274.5 Cash flows from financing activities: Interest paid (364.1) — (58.4) (422.5) Vendor financing additions 271.2 — — 271.2 Repayments of debt and lease liabilities — — (107.6) (107.6) Principal payments on operating-related vendor financing (171.8) — — (171.8) Principal payments on capital-related vendor financing (124.8) — — (124.8) Payment of financing costs and debt premiums 0.1 — — 0.1 Net cash received related to derivative instruments — 117.1 — 117.1 Total cash flows from financing activities (389.4) 117.1 (166.0) (438.3) Realized and unrealized (gains) losses on derivative instruments, net — 524.4 — 524.4 Interest accruals 358.7 — 67.9 426.6 Assets acquired under leases — — 56.2 56.2 Assets acquired under capital-related vendor financing arrangements, including VAT 77.6 — — 77.6 Effect of changes in foreign exchange rates (453.4) (13.3) — (466.7) Other related party charges 1.7 — — 1.7 Other changes 0.1 (5.4) (48.4) (53.7) Balance as of December 31, 2023 5,537.3 607.3 1,257.6 7,402.2 Debt and accrued interest Derivative (assets)/liabilities Lease liabilities Total CHF in millions Balance as of January 1, 2022 6,882.3 304.0 1,120.1 8,306.4 Cash flows from financing activities: Interest paid (267.6) — (61.6) (329.2) Vendor financing additions 148.2 — — 148.2 Repayments of debt and lease liabilities (899.4) — (112.4) (1,011.8) Principal payments on operating-related vendor financing (198.2) — — (198.2) Principal payments on capital-related vendor financing (86.3) — — (86.3) Payment of financing costs and debt premiums (26.3) — — (26.3) Net cash received related to derivative instruments — (4.9) — (4.9) Related-party payments (149.2) — — (149.2) Total cash flows from financing activities (1,478.8) (4.9) (174.0) (1,657.7) Losses on debt extinguishment (2.8) — — (2.8) Realized and unrealized (gains) losses on derivative instruments, net — (348.4) — (348.4) Interest accruals 272.8 — 65.3 338.1 Assets acquired under leases — — 343.9 343.9 Assets acquired under capital-related vendor financing arrangements, including VAT 117.5 — — 117.5 Effect of changes in foreign exchange rates (47.8) (1.2) — (49.0) Other related party charges 205.7 — — 205.7 Other changes (6.8) 35.0 (7.4) 20.8 Balance as of December 31, 2022 5,942.1 (15.5) 1,347.9 7,274.5

INVESTMENTS

INVESTMENTS	12 Months Ended
	Dec. 31, 2024
Investments Accounted For Using Equity Method1 [Abstract]
INVESTMENTS	INVESTMENTS The details of investments accounted for using the equity method are set forth below: December 31 2024 2023 CHF in millions Balance at 1 January 52.5 55.9 Additions 0.6 0.0 Share of net results 1.3 (0.3) Dividends (3.0) (3.1) Other (3.0) — Balance at 31 December 48.4 52.5

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	12 Months Ended
	Dec. 31, 2024
Related Party [Abstract]
RELATED PARTY TRANSACTIONS	RELATED-PARTY TRANSACTIONS The following table provides details of related-party transactions: December 31 2024 2023 2022 CHF in millions Credits (charges) included in: Revenue 3.1 4.6 2.9 Direct costs (3.8) (2.3) (5.6) Personnel expenses (15.9) (18.6) (23.0) Other operating expenses (116.9) (118.1) (183.3) Included in operating income (loss) (133.5) — (134.4) (209.0) Finance expense (1.5) (1.7) — Finance income 3.0 2.1 1.1 Included in net income (loss) (132.0) (134.0) (207.9) Property and equipment transfers in, net 11.3 23.7 4.9 Prior to the spin-off, the Sunrise's business was a segment of Liberty Global such that transactions with Liberty Global were considered related-party transactions. Sunrise will remain a strategic partnership and entered into a separation and distribution agreement as well as various other agreements governing relationships with Liberty Global going forward, including technology and IT services, financial services, shared services, and a variety of transitional management services to drive operational efficiency and value maximization. Information included in this Note with respect to Liberty Global is strictly limited to related-party transactions with Liberty Global prior to the spin-off on 8 November 2024. Sunrise charges fees and allocates costs and expenses to certain other LG subsidiaries and vice versa, as further described below. Although we believe that the related-party charges and allocations described below are reasonable, no assurance can be given that the related-party costs and expenses reflected in our consolidated statements of operations are reflective of the costs that we would incur on a standalone basis. Revenue Amounts primarily relate to interconnect services provided to certain subsidiaries of LG, for which the amount of the charges or allocations are based upon commercially negotiated rates. Direct costs Personnel expenses Amounts are allocated to Sunrise by other LG subsidiaries and represent share-based compensation expenses associated with the LG share-based incentive awards held by certain employees of Sunrise, which are allocated based on Sunrise’s share of costs without any additional mark-ups. Other operating expenses Amounts primarily include charges from other LG subsidiaries for network and software-related services, maintenance, hosting and other items, which are allocated to Sunrise’s share of costs with or without any additional mark-ups depending on the services provided. Additionally, Sunrise receives services from LG’s corporate departments under the terms of a general service agreement. These services are allocated from LG to Sunrise based on Sunrise’s share of costs with an additional mark-up. Interest expense Interest income Amounts primarily include interest accrued on a related-party loan with a subsidiary of LG. Interest income is accrued and included in long-term interest receivable during the year, and then added to the receivable balance at the beginning of the following year. Property and equipment additions, net The following table provides details of Sunrise's related-party balances: December 31 2024 2023 CHF in millions Current receivables (a) 1.8 6.1 Long-term note receivables — 202.5 1.8 208.6 Accounts payable 0.3 14.5 Accrued other liabilities 20.4 38.8 Non-current related party loan — 51.2 Other non-current liabilities 0.1 1.8 20.8 106.3 (a) These receivables are non-interest bearing, may be cash or loan settled and are included within trade receivables, net and other current assets. The settlement of the long-term note receivables and the non-current related-party loan, together with other spin-off related transactions and cash-flows led to a net cash flow in the amount of CHF 112.7 million as disclosed in the consolidated statements of cash flows.

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS	12 Months Ended
	Dec. 31, 2024
Acquisitions [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS On 13 January 2023, Sunrise acquired all outstanding shares of the telco business of the Elektra Baselland Telecom ('EBLT') cooperative. Fair value recognized on acquisition (CHF in millions) Assets: Cash and cash equivalents 5.2 Accounts receivable 3.6 Other receivables 0.6 Inventories 0.1 Accrued income 0.3 Property, plant and equipment 73.7 Intangible assets 8.1 91.6 Liabilities: Accounts payable (2.6) Other current liabilities (0.9) Accrued liabilities (0.7) Deferred tax liabilities (3.5) (7.7) Total identifiable net assets at fair value 83.9 Goodwill arising on acquisition 6.4 Total consideration transferred 90.3 Cash acquired with the subsidiary (5.2) Net cash paid for acquisition 85.1 Since the date of acquisition, EBLT has been fully integrated and therefore contributed to the continuing operations of Sunrise.

SUBSIDIAIRIES AND ASSOCIATES

SUBSIDIAIRIES AND ASSOCIATES	12 Months Ended
	Dec. 31, 2024
Interests in Other Entities [Abstract]
SUBSIDIARIES AND ASSOCIATES	SUBSIDIARIES AND ASSOCIATES The following table lists the principal legal entities which are included in the consolidated financial statements: Company name Operating purpose Registered office Currency December 31, 2024 capital and voting rights share in % December 31, 2023 capital and voting rights share in % CH Media TV AG 3 Media Switzerland CHF 20.00 20.00 ello communications S.A. Telecommunications Switzerland CHF 60.00 60.00 ITV Betriebsgesellschaft GmbH 3 Telecommunications Switzerland CHF 50.00 50.00 Naxoo S.A 3 Telecommunications Switzerland CHF 48.90 48.90 REGIONALE GEMEINSCHAFTS-ANTENNEN-ANLAGE SPIEZ AG REGAS 3 Telecommunications Switzerland CHF 30.00 30.00 Sitel S.A. Telecommunications Switzerland CHF 66.70 66.70 Sunrise Financing Partnership Holding United States CHF 100.00 100.00 Sunrise FinCo I B.V. Holding Netherlands CHF 100.00 100.00 Sunrise FinCo II B.V. Holding Netherlands CHF 100.00 100.00 Sunrise GmbH Telecommunications Switzerland CHF 100.00 100.00 Sunrise HoldCo I B.V. Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo II B.V. Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo III B.V. Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo IV B.V. 1 Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo V B.V. Holding Netherlands CHF 100.00 — Sunrise HoldCo VI B.V. 2 Holding Netherlands CHF 100.00 — Sunrise Portugal S.A. Telecommunications Portugal CHF 100.00 100.00 Swiss Open Fiber AG Telecommunications Switzerland CHF 100.00 100.00 Swiss-Ski Store GmbH 3 Other Switzerland CHF 50.00 — TELDAS GmbH 3 Telecommunications Switzerland CHF 23.00 23.00 Télédistal S.A. Telecommunications Switzerland CHF 38.90 38.90 Télévaux S.A. Telecommunications Switzerland CHF 80.00 80.00 UPCB Finance VII Limited 4 Holding Cayman Islands CHF — — 1) In 2023, Sunrise HoldCo IV B.V. was directly held by Sunrise HoldCo V B.V. (former Liberty Global Europe Financing B.V.).All other entities were indirect subsidiaries of Sunrise HoldCo V B.V. (former Liberty Global Europe Financing B.V). 2) In 2024, following the spin-off, Sunrise HoldCo VI B.V. is directly held. All other entities are indirect subsidiaries of Sunrise Communications AG. 3) Investment is accounted for using the equity method. 4) As of 31 December 2024, no shares are held, but the entity is controlled by Sunrise.

EVENTS AFTER THE BALANCE SHEET

EVENTS AFTER THE BALANCE SHEET DATE	12 Months Ended
	Dec. 31, 2024
Events After Reporting Period [Abstract]
EVENTS AFTER THE BALANCE SHEET DATE	EVENTS AFTER THE BALANCE SHEET DATE On 4 February 2025 Sunrise has announced the issuance of a new USD 1,300 million term loan facility under the terms of the Additional Facility AAA Accession Agreement to Sunrise Financing Partnership, issued at 99.75% of par. The facility AAA will bear interest at a rate of 2.50% (the Original Margin) per annum and be due on 31 January 2032. The full proceeds of the issuance will be used to refinance the existing USD Term Loan B due 2029 (Bank Facility AX) and partially refinance existing EUR Term Loan B (Bank Facility AY) due 2029. The Original Margin depends on meeting the conditions and targets in Sunrise’s Sustainability Report and ESG Certificate. These must be shared with the Facility Agent from the financial year ending 31 December 2026 to 31 December 2031. Please refer to Exhibit 4.8 Additional Facility AAA Accession Agreement for detailed information on the terms.

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Sunrise is subject to risks from cyber-attacks that have the potential to cause significant interruptions to the operation of its business. The frequency of these attempted intrusions has increased in recent years and the sources, motivations and techniques of attack continue to evolve and change rapidly. Sunrise has developed a cybersecurity program that is designed to scan for, monitor and identify risks to company confidential or non-public information, protect such information, detect threats and events and maintain an appropriate response and recovery capability to help ensure resilience against cyber-attacks and other information security incidents. Sunrise has adopted a variety of measures to monitor and address cyber-related risks and continue to implement and explore additional cybersecurity measures.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Sunrise has developed a cybersecurity program that is designed to scan for, monitor and identify risks to company confidential or non-public information, protect such information, detect threats and events and maintain an appropriate response and recovery capability to help ensure resilience against cyber-attacks and other information security incidents. Sunrise has adopted a variety of measures to monitor and address cyber-related risks and continue to implement and explore additional cybersecurity measures. Sunrise's strategy for managing cyber-related risks is risk-based and, where appropriate, integrated within our comprehensive enterprise risk management processes.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Sunrise's CISO provides periodic updates to the Audit Committee on the state of Sunrise's cybersecurity posture, new threats or threat actors that the company is monitoring or developing defenses against and any potential areas of improvement. Sunrise's CEO, CTO, CISO and CAO also have to provide ad hoc updates to the Audit Committee and full board of directors, as appropriate, in the case of a material cybersecurity incident, providing them a full briefing of the type and scope of the incident as well as the company’s current and planned mitigation efforts. All the memebrs of the Audit Committee have significant direct or indirect cybersecurity experience. Cybersecurity and the effectiveness of our cybersecurity strategy are regular topics of discussion at meetings of our Audit Committee and board of directors.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	Sunrise's Audit Committee is responsible for oversight of our cybersecurity measures, incident response management and risks related to cybersecurity and technology as well as the steps taken by management to mitigate such risks.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	Sunrise's CISO provides periodic updates to the Audit Committee on the state of Sunrise's cybersecurity posture, new threats or threat actors that the company is monitoring or developing defenses against and any potential areas of improvement. Sunrise's CEO, CTO, CISO and CAO also have to provide ad hoc updates to the Audit Committee and full board of directors, as appropriate, in the case of a material cybersecurity incident, providing them a full briefing of the type and scope of the incident as well as the company’s current and planned mitigation efforts.
Cybersecurity Risk Role of Management [Text Block]	Sunrise's Chief Information Security Officer (“CISO”), who reports directly to Sunrise's Chief Technology Officer (“CTO”), leads a dedicated cybersecurity team and is responsible for the design, implementation and execution of our cyber-risk management strategy. Additionally, the Compliance, Regulatory & Governance team who is reporting to the General Counsel and Chief Corporate Affairs Officer (“CAO”) and works closely with the CISO on information security matters oversees and manages the ISO 27001:2022 certified Sunrise Information Security Management System (“ISMS”) as well as the ISO 22301 certified Sunrise Business Continuity Management System (“BCMS”). Both of these management systems include a comprehensive and specific risk management and policy framework. The risks from the respective management systems feed directly into the corporate risk management and are regularly reported to the Audit Committee. Sunrise's CISO and cybersecurity teams actively monitor Sunrise's systems, regularly review and adapt its policies, compliance, regulations and best practices, perform penetration testing, conduct incident response exercises and internal ethical phishing campaigns and provide periodic training and communication across the organization to strengthen security focused behavior and foster a culture of digital safety. Sunrise's cybersecurity team also routinely participates in industry-wide programs to further information sharing, intelligence gathering and unity of effort in responding to potential or actual attacks. The Sunrise ISO certified BCMS operates and is externally audited on a yearly cycle and includes comprehensive business continuity plans for all critical systems and activities to develop an effective recovery strategy that seeks to decrease incident response times, limit financial impacts and maintain customer confidence during any business interruption. As part of the ISO certified ISMS, Sunrise also administers a third-party risk governance program that identifies potential risks introduced through third-party relationships, such as vendors, software and hardware manufacturers or professional service providers. Sunrise seeks to obtain certain contractual security guarantees and assurances with these third-party relationships to help ensure the security and safety of its information. The cybersecurity teams works closely with a broad range of departments, including legal, regulatory, corporate communications, audit services, information technology and operational technology functions critical to Sunrise's operations, as well as engaging external vendors to help ensure the company’s cybersecurity program operates effectively. Sunrise's current CISO, Antti Partanen, has significant experience leading cybersecurity efforts at large enterprises, having worked immediately prior to joining Sunrise at Vodafone Global Cyber Security where he was instrumental in shaping the Cyber Security function at Vodafone Germany, the biggest Vodafone OpCo, where he held the roles of Head of Cyber Prevent and Deputy Chief Information Security Officer during a period of eight years. The Sunrise CISO also holds a Masters degree in Communications Engineering, Telecommunications Systems and Network Security from Helsinki University of Technology (Aalto University). Furthermore, he is a ISACA-Certified Information Security Manager. Sunrise's CISO has been with the company or its subsidiaries for over two years. Cybersecurity incidents detected by Sunrise's cybersecurity team are evaluated internally based on their severity Management of cyber incidents is aligned with the Sunrise Corporate Crisis Management 5 , with major incidents being escalated to, and managed by, the Corporate Crisis Management, and according to the thresholds defined in the Corporate Crisis Management, escalated to the highest levels of management, including the company’s Chief Technology Officer (“CTO”), its CAO, and, ultimately, its CEO. These members of the Executive Committee are provided with details of the type and severity of the attack, the company’s planned response to the incident and are briefed on what information was accessed and the impact such incident has had or is expected to have on the company’s operations, as well as any financial or regulatory implications resulting from the incident. Sunrise's Audit Committee is responsible for oversight of our cybersecurity measures, incident response management and risks related to cybersecurity and technology as well as the steps taken by management to mitigate such risks. Sunrise's CISO provides periodic updates to the Audit Committee on the state of Sunrise's cybersecurity posture, new threats or threat actors that the company is monitoring or developing defenses against and any potential areas of improvement. Sunrise's CEO, CTO, CISO and CAO also have to provide ad hoc updates to the Audit Committee and full board of directors, as appropriate, in the case of a material cybersecurity incident, providing them a full briefing of the type and scope of the incident as well as the company’s current and planned mitigation efforts. All the memebrs of the Audit Committee have significant direct or indirect cybersecurity experience. Cybersecurity and the effectiveness of our cybersecurity strategy are regular topics of discussion at meetings of our Audit Committee and board of directors.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Sunrise's Chief Information Security Officer (“CISO”), who reports directly to Sunrise's Chief Technology Officer (“CTO”), leads a dedicated cybersecurity team and is responsible for the design, implementation and execution of our cyber-risk management strategy. Additionally, the Compliance, Regulatory & Governance team who is reporting to the General Counsel and Chief Corporate Affairs Officer (“CAO”) and works closely with the CISO on information security matters oversees and manages the ISO 27001:2022 certified Sunrise Information Security Management System (“ISMS”) as well as the ISO 22301 certified Sunrise Business Continuity Management System (“BCMS”)
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Sunrise's current CISO, Antti Partanen, has significant experience leading cybersecurity efforts at large enterprises, having worked immediately prior to joining Sunrise at Vodafone Global Cyber Security where he was instrumental in shaping the Cyber Security function at Vodafone Germany, the biggest Vodafone OpCo, where he held the roles of Head of Cyber Prevent and Deputy Chief Information Security Officer during a period of eight years. The Sunrise CISO also holds a Masters degree in Communications Engineering, Telecommunications Systems and Network Security from Helsinki University of Technology (Aalto University). Furthermore, he is a ISACA-Certified Information Security Manager. Sunrise's CISO has been with the company or its subsidiaries for over two years.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	Cybersecurity incidents detected by Sunrise's cybersecurity team are evaluated internally based on their severity Management of cyber incidents is aligned with the Sunrise Corporate Crisis Management 5
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

MATERIAL ACCOUNTING POLICIES (P

MATERIAL ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2024
Material Accounting Policies [Abstract]
Foreign currency translation	Foreign currency translation
Revenue from contracts with customers	Revenue from contracts with customers Revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects the consideration (net of VAT) to which the entity expects to be entitled in exchange for those goods or services. Revenue is recognized when the customer obtains control of the promised goods or services. Significant sources of revenue are explained in Note 6. Sunrise groups multi-component contracts (e.g., mobile subscription with subsidized mobile hardware) into portfolios and allocates the total transaction price to each separate performance obligation (including undelivered elements) in proportion to the stand-alone selling prices. Revenue is recognized when the customer obtains control of the separate components. In the consolidated statements of financial position, timing differences in the recognition of revenue between separate performance obligations lead to the recognition of a contract asset, i.e., a legally not yet entitled right to consideration from a contract with a customer. Incremental costs to obtain a contract with a customer, such as incremental sales commissions, are generally recognized as assets and amortized over the applicable period benefited, which generally is the contract life. If, however, the amortization period is less than one year, Sunrise expenses such costs in the period incurred. In contrast, activation fees lead to the recognition of a contract liability, i.e., the obligation to transfer goods or services to a customer for which the entity has received consideration from the customer. Contract assets and liabilities are determined at the contract level and not at the performance obligation level. Accrued income and deferred discounts are classified as part of contract assets. Revenue is recognized gross when Sunrise acts as a principal in a transaction. For content-based services and handsets sold via third party retailers, where Sunrise acts as an agent, revenue is recognized net of direct costs.
Direct Costs	Direct costs Direct costs are related to acquiring, producing or gaining access to the product, content or service that is sold to the customer. These include, but are not limited to, costs for hardware, access, copyrights, programming, roaming, interconnection, new build and built-to-suit.
Property, plant and equipment	Property, plant and equipment Property, plant and equipment ('PP&E') are measured at cost less accumulated depreciation and write-downs for impairment. Costs comprise purchase price and costs directly attributable to the acquisition until the date on which the asset is ready for use, as well as the estimated costs of dismantling and restoring the site. The costs of self-constructed assets include directly attributable payroll costs, materials, parts purchased, and services rendered by sub-suppliers during the construction period. Costs also include estimated asset retirement costs on a discounted basis if the related obligation meets the conditions for recognition as a provision. The depreciation base is measured at cost less residual value and any write-downs. Depreciation is provided on a straight-line basis over the estimated useful life of the assets as follows: Asset category Useful lives Support equipment and buildings 3 to 33 years Distribution systems 3 to 30 years Customer premises equipment ('CPE') 4 to 5 years The depreciation expense of property, plant and equipment is included in depreciation and amortization expenses in the consolidated statements of income or loss. Property, plant and equipment that have been disposed of or scrapped are eliminated from accumulated costs and accumulated depreciation. Gains and losses arising from the sale of property, plant and equipment are measured as the difference between the sales price less selling expenses and the carrying value at the time of sale. The resulting gain or loss is recognized in the consolidated statements of income or loss in other operating income or other operating expenses, respectively. Software that is an integral part of a tangible asset (e.g., telephone exchange installations) is presented together with the related tangible assets. If indications exist that the value of an asset may be impaired, the recoverable amount of the asset is determined. If the recoverable amount of the asset, which is the higher of the fair value less costs to sell and the value in use, is less than its carrying amount, the carrying amount is reduced to the recoverable amount.
Intangible assets	Intangible assets Intangible assets comprise software, licenses and rights, brands and other intangible assets required to operate the business, and software developed or customized by Sunrise. Intangible assets are measured at cost less accumulated amortization and impairment losses and are amortized on a straight-line basis over their estimated useful lives. Broadcasting rights and spectrum licenses are generally multi-year contracts, for which an asset is recognized in the amount of the contract consideration with a corresponding liability for any unpaid portion of the total contract costs at contract inception. The rights are amortized on a straight-line basis over the contract term. Asset category Useful lives Software 3 to 5 years Licenses and rights 5 to 26 years Brands and customer relationships 6 to 10 years Other intangible assets 2 to 25 years The amortization expense of intangible assets is included in depreciation and amortization expenses in the consolidated statements of income or loss. Development projects, including costs of computer software purchased or developed for internal use, are recognized as intangible assets if the costs can be calculated reliably and if they are expected to generate future economic benefits. Costs of development projects include wages and external charges. Development projects that do not meet the criteria for recognition in the consolidated statements of financial position are expensed as incurred.
Non-derivative financial instruments	Non-derivative financial instruments Cash and cash equivalents, current trade and other receivables, current related-party receivables and payables, certain other current assets, accounts payable and certain accrued liabilities represent financial instruments that are initially recognized at fair value and subsequently carried at amortized cost. Due to their relatively short maturities, the carrying values of these financial instruments approximate their respective fair values. Loans and other receivables are financial assets with fixed or determinable payments that are not quoted in an active market. Such loans and other receivables are recognized initially at fair value plus any directly attributable transaction costs. Subsequent to initial recognition, loans and receivables are measured at amortized cost using the effective interest method, less any impairment losses.
Leases	Leases Sunrise leases mainly consist of rental of distribution systems, support equipment, buildings and land. Sunrise recognizes a right-of-use ('RoU') asset and a lease liability at the lease commencement date. The RoU asset is initially measured at cost, which comprises the initial amount of the lease liability adjusted for any lease payments made at or before the commencement date, plus any initial direct costs incurred. Furthermore, the RoU asset is adjusted for an estimate of costs to dismantle and remove the underlying asset or to restore the underlying asset or the site on which it is located. The RoU assets are subsequently depreciated using the straight-line method from the commencement date to the earlier of the useful life of the RoU asset or the end of the lease term. The useful lives per asset class are as follows: Asset category Useful lives Support equipment, buildings and land 3 to 33 years Distribution systems 3 to 30 years In addition, RoU assets are periodically reduced by impairment losses, if any, and adjusted for certain remeasurements of the lease liability. The RoU assets and the lease liabilities are presented separately in the consolidated financial statements. Lease liabilities are initially measured at the present value of the future lease payments, discounted using the interest rate implicitly specified in the lease or Sunrise’s incremental borrowing rate as the discount rate. Sunrise applies the short-term lease recognition exemption to leases of less than 12 months. Lease payments associated with these leases are recognized as an expense on a straight-line basis over the lease term.
Inventories	Inventories Inventories are measured at the lower of cost and net realizable value. The costs of merchandise include purchase price and delivery costs. The costs of work in progress comprise direct costs of merchandise, direct labor, other direct costs and related production overheads. Related costs for items sold are presented within direct costs in the consolidated statements of income or loss.
Trade receivables and other receivables	Trade receivables and other receivables Receivables are measured at amortized cost net of an allowance for uncollectible amounts. The allowance for trade receivables and contract assets is always measured at an amount equal to lifetime expected credit loss ('ECL'). When determining whether the credit risk of a financial asset has increased significantly, Sunrise considers both quantitative and qualitative information and analysis based on its historical experience, internal credit assessment and forward-looking information. Allowances for anticipated uncollectible amounts are based on individual assessments of major receivables and historically experienced losses on uniform groups of other receivables. This allowance is equal to the difference between the carrying amount and the present value of the amounts expected to be recovered. Significant financial difficulties of the debtor, the probability that the debtor will enter bankruptcy or financial reorganization, and default or delinquency in payments are considered indicators that the receivable is impaired. The loss is recognized in the consolidated statements of income or loss within other operating expenses. When a trade receivable is uncollectible, it is written off against the allowance account. Subsequent recoveries of amounts previously written off are credited against other operating expenses in the consolidated statements of income or loss.
Cash and cash equivalents	Cash and cash equivalents
Provisions	Provisions An asset retirement obligation ('ARO') is recognized when Sunrise has a legal or constructive obligation to remove the asset and restore the site where the asset was used at the end of the lease term (e.g., in connection with the future dismantling of mobile stations and restoration of property owned by third parties). Sunrise has estimated and capitalized the net present value of the obligations and increased the carrying amount of the asset by the respective amount. The estimated cash flows are discounted using a risk-adjusted interest rate, which is derived from Swiss government bonds along with a company-specific risk spread based on issued corporate bonds, and recognized as a provision. Subsequently, the unwinding of the discount is expensed in financial expenses. The capitalized amount is amortized over the expected lease period, including the potential extension option if it is expected to be exercised. Provisions are measured at management’s best estimate of the amount at which the liability is expected to be settled. If the timing of the settlement has a significant impact on the measurement of the liability, such liability is discounted.
Pensions	Pensions Sunrise’s pension plans comprise defined benefit plans established under Swiss pension legislation. Obligations are determined by independent qualified actuaries using the projected unit credit method assuming that each year of service gives rise to an additional unit of benefit entitlement and each unit is measured separately to build up the final obligations. Sunrise recognizes a gain or loss on curtailment when a commitment is made to significantly reduce the number of employees, generally as a result of a restructuring or disposal/discontinuation of part of the business or the outsourcing of business activities. Gains or losses on curtailment or, settlement of pension benefits are recognized in the consolidated statements of income or loss when the curtailment or settlement occurs. Differences between projected and realized changes in pension assets and pension obligations are referred to as actuarial gains and losses and are recognized in the consolidated statements of other comprehensive income when such gains and losses occur. In the case of changes in benefits relating to employees’ previous service periods, a change in the estimated present value of the pension obligations will be immediately recognized. The present value of the pension obligation is measured using a discount rate based on the interest rate on high-quality corporate bonds where the currency and terms of the corporate bonds are consistent with the currency and estimated terms of the defined benefit obligation.
Amendments to IFRS Accounting Standards and Interpretations, whose application is not yet mandatory	Amendments to IFRS Accounting Standards and Interpretations, whose application is not yet mandatory The following IFRS Accounting Standards and Interpretations published up to the end of 2024 are mandatory from the 2025 financial year onwards. Standard Name Effective from Amendments to IAS 21 Lack of exchangeability 1 January 2025 Amendments to IFRS 9 and IFRS 7 Classification and Measurement of Financial Instruments 1 January 2026 Amendments to IFRS 1, 7, 9, 10 and IAS 7 Annual Improvements to IFRS Accounting Standards 1 January 2026 Amendments to IFRS 9 Contracts Referencing Nature-dependent Electricity 1 January 2026 IFRS 18 Presentation and disclosure in financial statements 1 January 2027 IFRS 19 Subsidiaries without Public Accountability: Disclosures 1 January 2027 Sunrise will review its financial reporting for the impact of those new and amended standards which take effect on or after 1 January 2025 and which Sunrise did not choose to adopt earlier than required. At present, Sunrise anticipates no material impact on the consolidated financial statements, except for IFRS 18 issued by the IASB on 9 April 2024 . IFRS 18 will replace IAS 1, although many existing principles in IAS 1 are retained. The key concepts introduced in IFRS 18 relate to the structure of the statement of profit or loss, required disclosures in the financial statements for certain profit or loss performance measures that are reported outside an entity’s financial statements (that is, management-defined performance measures); and enhanced principles on aggregation and disaggregation which apply to both the primary financial statements and notes. IFRS 18 will not impact the recognition or measurement of items in the financial statements, but may change what an entity reports as its "operating profit or loss". Sunrise is currently evaluating the potential impact of IFRS 18 on its consolidated financial statements.

MATERIAL ACCOUNTING POLICIES (T

MATERIAL ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2024
Material Accounting Policies [Abstract]
New amendments which did not have a material impact on the consolidated financial statements	Several amendments apply for the first time in 2024, which did not have a material impact on the consolidated financial statements of Sunrise. Standard Name Effective from Amendments to IFRS 16 Lease liability in a sale and leaseback transaction 1 January 2024 Amendments to IAS 1 Classifying liabilities as current or non-current 1 January 2024 Amendments to IAS 1 Classifying non-current liabilities with covenants 1 January 2024 Amendments to IAS 7 Supplier finance arrangements 1 January 2024
Disclosure of foreign exchange rates	The following table summarizes the principal exchange rates used by Sunrise (shown against CHF): December 31 2024 2023 2022 Spot rates: Euro 1.0645 1.077 1.0128 US Dollar 1.1016 1.1916 1.0847 Year ended December 31 2024 2023 2022 Average rates: Euro 1.0502 1.0295 0.9948 US Dollar 1.1362 1.1135 1.0478
Disclosure of detailed information about property, plant and equipment	The depreciation base is measured at cost less residual value and any write-downs. Depreciation is provided on a straight-line basis over the estimated useful life of the assets as follows: Asset category Useful lives Support equipment and buildings 3 to 33 years Distribution systems 3 to 30 years Customer premises equipment ('CPE') 4 to 5 years Asset category Useful lives Support equipment, buildings and land 3 to 33 years Distribution systems 3 to 30 years Distribution systems Customer premises equipment Support equipment and buildings Assets under construction Total CHF in millions Cost: January 1, 2023 3,060.6 432.3 1,423.3 247.7 5,163.9 Additions 280.5 93.2 3.5 — 377.2 Additions from business combinations 70.7 — 3.0 — 73.7 Retirements and disposals (34.9) (93.3) (2.1) — (130.3) Reclassifications (65.9) (59.2) 25.2 99.9 — December 31, 2023 3,311.0 373.0 1,452.9 347.5 5,484.5 Additions 257.3 100.3 50.4 — 408.0 Retirements and disposals (213.1) (101.0) (25.3) — (339.4) Reclassifications (233.9) (9.6) (6.1) 173.2 (76.4) Other — — — (1.0) (1.0) December 31, 2024 3,121.3 362.7 1,471.9 519.7 5,475.7 Distribution systems Customer premises equipment Support equipment and buildings Assets under construction Total CHF in millions Accumulated depreciation and impairment: January 1, 2023 (2,326.1) (249.0) (291.7) — (2,866.8) Depreciation (290.8) (69.1) (92.6) — (452.5) Retirements and disposals 34.9 93.3 2.4 — 130.6 Reclassifications (47.3) 60.1 (12.8) — — December 31, 2023 (2,629.3) (164.7) (394.7) — (3,188.7) Depreciation (287.1) (67.9) (13.0) — (368.0) Retirements and disposals 213.1 100.7 25.2 — 339.0 Reclassifications — — 65.5 — 65.5 Other 9.8 2.0 3.2 — 15.0 December 31, 2024 (2,693.5) (129.9) (313.8) — (3,137.2) Distribution systems Customer premises equipment Support equipment and buildings Assets under construction Total CHF in millions Property and equipment, net: Net carrying amount at December 31, 2023 681.7 208.3 1,058.2 347.5 2,295.7 Net carrying amount at December 31, 2024 427.8 232.8 1,158.1 519.7 2,338.5
Disclosure of detailed information about intangible assets	The rights are amortized on a straight-line basis over the contract term. Asset category Useful lives Software 3 to 5 years Licenses and rights 5 to 26 years Brands and customer relationships 6 to 10 years Other intangible assets 2 to 25 years Changes in the carrying amounts of the intangible assets are as follows: Brands and customers relationships Licenses and rights Software Other intangible assets Total CHF in millions Cost: January 1, 2023 1,972.0 652.1 523.3 18.3 3,165.7 Additions from business combinations 8.4 — — — 8.4 Additions 0.3 — 160.2 — 160.5 Retirements and disposals (27.4) — (48.3) — (75.7) Other 2.5 — — (1.1) 1.4 December 31, 2023 1,955.8 652.1 635.2 17.2 3,260.3 Additions — 2.0 99.9 — 101.9 Retirements and disposals — (153.5) (32.6) (8.0) (194.1) Reclassifications — — 76.4 — 76.4 Other 1.9 — — 3.6 5.5 December 31, 2024 1,957.7 500.6 778.9 12.8 3,250.0 Brands and customers relationships Licenses and rights Software Other intangible assets Total CHF in millions Accumulated amortization: January 1, 2023 (732.3) (252.7) (280.0) (1.6) (1,266.6) Amortization (322.0) (66.8) (143.6) (7.2) (539.6) Retirements and disposals 27.4 — 48.3 — 75.7 Other — — — 0.1 0.1 December 31, 2023 (1,026.9) (319.5) (375.3) (8.7) (1,730.4) Amortization (321.7) (69.0) (155.0) (4.2) (549.9) Retirements and disposals — 153.5 32.6 8.0 194.1 Reclassifications — — (65.5) — (65.5) Other — — (13.9) — (13.9) December 31, 2024 (1,348.6) (235.0) (577.1) (4.9) (2,165.6) Brands and customers relationships Licenses and rights Software Other intangible assets Total CHF in millions Intangible assets subject to amortization, net: Net carrying amount at 31 December 2023 928.9 332.6 259.9 8.5 1,529.9 Net carrying amount at 31 December 2024 609.1 265.6 201.8 7.9 1,084.4

SEGMENT REPORTING (Tables)

SEGMENT REPORTING (Tables)	12 Months Ended
	Dec. 31, 2024
Operating Segments [Abstract]
Disclosure of operating segments	Segment information Year ended December 31, 2024 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Total revenue 2,173.1 830.3 14.6 3,018.0 Direct costs (515.2) (299.5) (15.4) (830.1) Indirect costs 1 (401.5) (115.8) (449.1) (966.4) Lease expense 2 (52.0) (13.5) (133.9) (199.4) Adj. EBITDA after lease expense (EBITDAaL) 1,204.4 401.5 (583.8) 1,022.1 Depreciation and amortization of property, plant and equipment and intangible assets (917.9) Share-based compensation, restructuring & other (69.0) Finance income/(expense) 3 (413.8) Income tax benefit 16.7 Net income (loss) (361.9) 1 Excludes expenses for share-based compensation, restructuring and other. 2 Contains depreciation and interest expenses for leases arrangements under IFRS 16. Excludes expenses for short-term leases, which are reported in line "indirect cost". 3 Excludes interest expenses for leases, which are included in line "lease expense". Year ended December 31, 2023 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Total revenue 2,247.1 776.6 11.5 3,035.2 Direct costs (537.6) (271.0) (26.0) (834.6) Indirect costs 1 (417.5) (115.4) (428.2) (961.1) Lease expense 2 (51.0) (11.2) (133.7) (195.9) Adj. EBITDA after lease expense (EBITDAaL) 1,241.0 379.0 (576.4) 1,043.6 Depreciation and amortization of property, plant and equipment and intangible assets (992.1) Share-based compensation, restructuring & other (108.6) Finance income/(expense) 3 (315.0) Income tax benefit 59.9 Net income (loss) (312.2) Year ended December 31, 2022 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Total revenue 2,275.5 752.3 7.4 3,035.2 Direct costs (538.4) (267.7) (13.5) (819.6) Indirect costs 4 (417.8) (111.7) (417.6) (947.1) Lease expense 5 (39.9) (10.4) (160.4) (210.7) Adj. EBITDA after lease expense (EBITDAaL) 1,279.4 362.5 (584.1) 1,057.8 Depreciation and amortization of property, plant and equipment and intangible assets (1,028.8) Share-based compensation, restructuring & other (179.7) Finance income/(expense) 6 184.0 Income tax benefit 50.7 Net income (loss) 84.0 4 Excludes expenses for share-based compensation, restructuring and other. 5 Contains depreciation and interest expenses for leases arrangements under IFRS 16. Excludes expenses for short-term leases, which are reported in line "indirect cost". 6 Excludes interest expenses for leases, which are included in line "lease expense".

REVENUE FROM CONTRACTS WITH C_2

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)	12 Months Ended
	Dec. 31, 2024
Revenue From Contracts With Customers [Abstract]
Disclosure of disaggregation of revenue from contracts with customers	Revenue by major category and reportable segment is set forth below: Year ended December 31, 2024 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Fixed 1,001.8 483.0 — 1,484.8 Subscription 987.8 293.4 — 1,281.2 Non-subscription and hardware 14.0 189.6 — 203.6 Mobile 1,041.1 343.9 — 1,385.0 Subscription 833.5 266.2 — 1,099.7 Non-subscription and hardware 207.6 77.7 — 285.3 Other 130.2 3.4 14.6 148.2 Total 2,173.1 830.3 14.6 3,018.0 Year ended December 31, 2023 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Fixed 1,061.7 437.4 — 1,499.1 Subscription 1,043.1 273.4 — 1,316.5 Non-subscription and hardware 18.6 164.0 — 182.6 Mobile 1,052.3 336.2 — 1,388.5 Subscription 852.9 254.7 — 1,107.6 Non-subscription and hardware 199.4 81.5 — 280.9 Other 133.2 2.9 11.5 147.6 Total 2,247.2 776.5 11.5 3,035.2 Year ended December 31, 2022 Residential customers Business customers & Wholesale Infrastructure & Support functions Total CHF in millions Fixed 1,088.3 430.6 0.7 1,519.6 Subscription 1,079.6 270.0 0.7 1,350.3 Non-subscription and hardware 8.7 160.6 — 169.3 Mobile 1,053.5 320.8 — 1,374.3 Subscription 854.8 240.6 — 1,095.4 Non-subscription and hardware 198.7 80.2 — 278.9 Other 133.7 0.9 6.7 141.3 Total 2,275.5 752.3 7.4 3,035.2
Disclosure of contract costs	The following table provides information about contract assets and contract liabilities from contracts with customers. December 31 2024 2023 2022 CHF in millions Contract assets 27.8 31.7 22.5 The following table includes revenue from contracts with an original duration of more than one year which is expected to be recognized in the future related to performance obligations that are unsatisfied (or partially unsatisfied) at the reporting date. Year ended December 31 2025 2026 2027 CHF in millions Telecommunications services (mobile and fixed) 56.9 15.0 7.1
Disclosure of contract liabilities	December 31 2024 2023 2022 CHF in millions Contract liabilities to residential customers 46.0 43.1 55.3 Contract liabilities to business customers 28.0 36.3 19.2 Contract liabilities to other telecommunications services 0.8 0.4 0.5 Total 74.8 79.8 75.0 Thereof current portion of contract liabilities 71.3 66.7 69.9 Thereof non-current portion of contract liabilities 3.5 13.1 5.1
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers	2024 2023 CHF in millions Balance as of January 1 69.3 62.5 Additional capitalised contract cost 88.1 71.6 Amortized contract cost (77.0) (64.8) Balance as of December 31 80.4 69.3

OTHER OPERATING INCOME AND EX_2

OTHER OPERATING INCOME AND EXPENSES (Tables)	12 Months Ended
	Dec. 31, 2024
Analysis of income and expense [abstract]
Other Operating Income (Expense)	Year ended December 31 2024 2023 2022 CHF in millions Marketing & Commissions (188.8) (195.2) (195.9) Network related costs (170.6) (167.4) (207.6) Professional Services (105.7) (130.2) (130.1) Facility & Energy (66.5) (55.1) (51.0) IT expenses (57.6) (49.4) (50.9) Administration (34.7) (39.4) (43.0) Call centre services (34.7) (39.2) (39.6) Allowance for receivables (35.3) (16.9) (27.6) Other (2.5) (66.1) (4.4) Total other operating expenses (696.4) (758.8) (750.2) Capitalized labor as non-current assets 63.0 68.3 60.1 Other income 5.1 37.4 1.5 Total other operating income and capitalized labor 68.1 105.7 61.7

PERSONNEL EXPENSES (Tables)

PERSONNEL EXPENSES (Tables)	12 Months Ended
	Dec. 31, 2024
Personnel Expenses [Abstract]
Disclosure of personnel expenses	Year ended December 31 2024 2023 2022 CHF in millions Wages, salaries and social security charges 363.9 384.2 380.8 Pension expenses 24.0 10.0 26.8 Share-based compensation 19.1 22.5 30.7 Total 407.0 416.7 438.3

KEY MANAGEMENT PERSONNEL COMP_2

KEY MANAGEMENT PERSONNEL COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2024
Key Managment Personnel Compensation [Abstract]
Disclosure of transactions between related parties	Their compensation is as follows: Remuneration of the Executive Leadership Team and Board of Directors Year ended December 31 2024 2023 2022 CHF in millions Wages, salaries and social security charges 8.4 6.2 8.0 Pension costs 0.8 0.8 1.2 Share-based compensation 6.6 6.9 9.1 Termination benefits 0.7 2.5 0.7 Total 16.5 16.4 19.0 The following table provides details of related-party transactions: December 31 2024 2023 2022 CHF in millions Credits (charges) included in: Revenue 3.1 4.6 2.9 Direct costs (3.8) (2.3) (5.6) Personnel expenses (15.9) (18.6) (23.0) Other operating expenses (116.9) (118.1) (183.3) Included in operating income (loss) (133.5) — (134.4) (209.0) Finance expense (1.5) (1.7) — Finance income 3.0 2.1 1.1 Included in net income (loss) (132.0) (134.0) (207.9) Property and equipment transfers in, net 11.3 23.7 4.9 The following table provides details of Sunrise's related-party balances: December 31 2024 2023 CHF in millions Current receivables (a) 1.8 6.1 Long-term note receivables — 202.5 1.8 208.6 Accounts payable 0.3 14.5 Accrued other liabilities 20.4 38.8 Non-current related party loan — 51.2 Other non-current liabilities 0.1 1.8 20.8 106.3 (a) These receivables are non-interest bearing, may be cash or loan settled and are included within trade receivables, net and other current assets.

EMPLOYEE BENEFIT OBLIGAITONS (T

EMPLOYEE BENEFIT OBLIGAITONS (Tables)	12 Months Ended
	Dec. 31, 2024
Employee Benefit Obligations [Abstract]
Post-employment Benefit Expense In Profit Or Loss, Defined Benefit Plans	Pension (income) costs resulting from defined benefit plans December 31 2024 2023 2022 CHF in millions Current service costs excluding interest costs 19.5 16.9 20.7 Net interest costs on defined benefit obligation and service costs 0.4 0.3 0.1 Past service income (2.1) (13.5) (0.3) Administration costs 1.7 0.6 0.9 Termination benefits 0.2 0.2 0.2 Total 19.7 4.5 21.6
Disclosure of Employee Benefit Obligation Disclosure	Assets and obligations December 31 2024 2023 CHF in millions Fair value of plan assets 851.4 793.7 Defined benefit obligation (859.8) (802.1) Total (8.4) (8.4) Movement in other comprehensive income December 31 2024 2023 2022 CHF in millions Actuarial (gain) / loss due to demographic assumptions — (0.1) (0.6) financial assumptions 15.5 81.0 (163.9) experience adjustments 39.9 5.6 11.8 Actuarial (gain) / loss during period 55.4 86.5 (152.6) Return on defined benefit plan assets (greater)/less than net interest recognised (48.4) (18.8) 108.4 Impact of changes in asset ceiling — (37.3) 33.2 Remeasurement effects recognized in OCI 7.0 30.4 (11.0) Movement in defined benefit obligations 2024 2023 CHF in millions Balance as of January 1 802.1 748.8 Included in the consolidated statements of income or loss Current service costs 19.5 16.9 Past service income (2.1) (13.5) Interest costs on defined benefit obligation 10.5 16.4 Administration costs and termination benefits 1.9 0.8 Settlements — (6.2) Included in consolidated statements of other comprehensive income Actuarial (gain) / loss arising from: Demographic assumptions — (0.1) Financial assumptions 15.5 81.0 Experience adjustment 39.9 5.6 Other Employee contributions 20.1 20.4 Benefits paid / transferred (47.5) (68.0) Total defined benefit obligations as of December 31 859.9 802.1 Movement in fair value of plan assets 2024 2023 CHF in millions Balance as of January 1 793.7 784.3 Included in the consolidated statements of income or loss Interest income 10.1 16.8 Settlements — (6.2) Included in consolidated statements of other comprehensive income Return on plan assets excluding interest income 48.4 18.8 Other Employer contributions 26.6 27.5 Employee contributions 20.1 20.5 Benefits paid (47.5) (68.0) Total fair value of plan assets as of December 31 851.4 793.7
Disclosure of fair value of plan assets	Asset allocation of plan assets December 31 2024 2023 CHF in millions Quoted Unquoted CHF in millions Quoted Unquoted Cash and cash equivalents 12.1 — % 1.4 % 8.8 — % 1.1 % Equity securities 301.6 35.4 % — % 267.2 33.7 % — % Debt securities 305.8 35.9 % — % 299.5 37.7 % — % Real estate 168.5 1.5 % 18.3 % 159.4 2.8 % 17.2 % Other 63.4 — % 7.4 % 58.8 — % 7.4 % Total 851.4 72.8 % 27.2 % 793.7 74.3 % 25.7 %
Disclosure of Sensitivity Analysis and Actuarial Assumptions	Principal actuarial assumptions December 31 2024 2023 Discount rate 0.95 % 1.35 % Interest crediting rate 1.25 % 2.30 % Future salary increases 1.60 % 1.70 % Mortality rates BVG/LPP 2020 BVG/LPP 2020 Sensitivity analysis 2024 Increase to Decrease to CHF in millions Discount rate (0.5% movement) 809.9 916.2 Future salary increases (1.0% movement) 871.7 849.9

SHARE-BASED COMPENSATION (Table

SHARE-BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangements [Abstract]
Summary of Share-Based Compensation Costs	The following share-based compensation costs have been recognized in this financial year: December 31, 2024 CHF in millions Non-performance based incentive awards 4.9 Performance-based incentive awards 1.2 Shares 0.8 SHIP 1 2.3 Other 9.9 Total share-based payments costs 19.1 1 Certain employees can elect for (a portion of) their annual bonus to be paid out in shares. As a consequence, this expense is a part of total share-based compensation. 2 Sunrise has the intent to settle these awards in shares.
Summary of Fair Value at Grant Date	Grant date FV at grant date Non-performance based incentive awards LTI 2024 RSU 25/3/2024 34.07 LTI 2024 SAR 25/3/2024 9.66 LTI 2024 RSU 2/8/2024 36.59 LTI 2024 SAR 2/8/2024 10.45 Initial Award RSU 6/12/2024 41.55 Initial Award RSU 30/12/2024 39.32 Performance-based incentive awards LTI 2024 PSU 25/3/2024 50.01 LTI 2024 PSU 2/8/2024 44.65 Initial Award PSU 6/12/2024 42.09 Initial Award PSU 30/12/2024 42.09 Shares 6/12/2024 41.55
Disclosure of other equity options	Number of units PSUs RSUs SARs Shares Total 2024 Balance January 1 - - - - - Granted 421,608 408,262 471,729 99,186 1,400,785 Settled - - - (99,186) (99,186) Forfeited - (8,863) (10,485) - (19,348) Balance December 31 421,608 399,399 461,244 0 1,282,251 Number of SARs units Weighted average strike price (CHF) Balance January 1 - - Granted 471,729 33.88 Forfeited (10,485) 33.57 Outstanding December 31 461,244 33.88

OTHER OPERATING ASSETS AND LI_2

OTHER OPERATING ASSETS AND LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2024
Disclosure Of Other Operating Assets And Liabilities [Abstract]
Summary of Other Current and Non-Current Assets and Liabilities	The details of Sunrise's other current and non-current assets as well as other current and non-current liabilities are set forth below: December 31 2024 2023 CHF in millions Other assets - current: Third party receivables 63.4 120.0 Prepayments 60.8 128.7 Contract assets 14.6 17.3 Contract costs 61.1 53.6 Inventories 58.5 50.1 Other 1.5 6.3 Total 259.9 376.0 Other assets - non-current: Trade receivables 34.3 44.0 Prepayments 82.1 31.7 Contract assets 13.2 14.4 Contract costs 19.2 15.8 Other 11.6 10.5 Total 160.4 116.4 Other liabilities - current: Accrued other liabilities 261.0 335.0 Accrued capital expenditures 63.5 66.9 Accrued payroll and employee benefits 68.3 83.0 Deferred revenue 71.3 66.7 Other 32.9 31.2 Total 497.0 582.8 Other liabilities - non-current: Other 48.2 89.8 Total 48.2 89.8

LEASING (Tables)

LEASING (Tables)	12 Months Ended
	Dec. 31, 2024
Disclosure Of Leases [Abstract]
Summary of Right-of-Use Assets	Right-of-use assets December 31 2024 2023 CHF in millions Distribution systems 1,091.4 1,166.2 Support equipment, buildings and land 171.1 128.0 Total RoU assets 1,262.5 1,294.2
Summary of Lease Expense	Lease expenses Year ended December 31 2024 2023 2022 CHF in millions Depreciation and amortization Distribution systems 101.4 99.3 96.3 Support equipment, buildings and land 28.3 28.7 49.1 Total depreciation and amortization 129.7 128.0 145.4 Interest expense 69.8 67.9 65.3 Short-term lease expense 9 2.4 3.2 3.2 Total lease expense 201.9 199.1 213.9 9 Included in operating income before depreciation and amortization. Cash flows from leases Year ended December 31 2024 2023 CHF in millions Principal payments 114.4 107.6 Interest payments 61.0 58.4 Payments for short-term leases 2.4 3.2 Total payments 177.8 169.2
Summary of Maturities of Lease Liabilities	Maturities of our lease liabilities are presented below: Year ended December 31 2024 2023 CHF in millions Within 1 year 164.1 170.4 Between 1 and 2 years 152.0 153.9 Between 2 and 3 years 148.8 145.5 Between 3 and 4 years 141.3 141.9 Between 4 and 5 years 135.2 135.0 After 5 years 925.7 1,002.2 Total payments 1,667.1 1,748.9 Less: present value discount (447.8) (491.2) Present value of lease payments 1,219.3 1,257.7 Current portion 164.1 170.4 Non-current portion 1,055.2 1,087.3

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2024
Disclosure Of Property, Plant, And Equipment1 [Abstract]
Summary of Property, Plant, and Equipment	The depreciation base is measured at cost less residual value and any write-downs. Depreciation is provided on a straight-line basis over the estimated useful life of the assets as follows: Asset category Useful lives Support equipment and buildings 3 to 33 years Distribution systems 3 to 30 years Customer premises equipment ('CPE') 4 to 5 years Asset category Useful lives Support equipment, buildings and land 3 to 33 years Distribution systems 3 to 30 years Distribution systems Customer premises equipment Support equipment and buildings Assets under construction Total CHF in millions Cost: January 1, 2023 3,060.6 432.3 1,423.3 247.7 5,163.9 Additions 280.5 93.2 3.5 — 377.2 Additions from business combinations 70.7 — 3.0 — 73.7 Retirements and disposals (34.9) (93.3) (2.1) — (130.3) Reclassifications (65.9) (59.2) 25.2 99.9 — December 31, 2023 3,311.0 373.0 1,452.9 347.5 5,484.5 Additions 257.3 100.3 50.4 — 408.0 Retirements and disposals (213.1) (101.0) (25.3) — (339.4) Reclassifications (233.9) (9.6) (6.1) 173.2 (76.4) Other — — — (1.0) (1.0) December 31, 2024 3,121.3 362.7 1,471.9 519.7 5,475.7 Distribution systems Customer premises equipment Support equipment and buildings Assets under construction Total CHF in millions Accumulated depreciation and impairment: January 1, 2023 (2,326.1) (249.0) (291.7) — (2,866.8) Depreciation (290.8) (69.1) (92.6) — (452.5) Retirements and disposals 34.9 93.3 2.4 — 130.6 Reclassifications (47.3) 60.1 (12.8) — — December 31, 2023 (2,629.3) (164.7) (394.7) — (3,188.7) Depreciation (287.1) (67.9) (13.0) — (368.0) Retirements and disposals 213.1 100.7 25.2 — 339.0 Reclassifications — — 65.5 — 65.5 Other 9.8 2.0 3.2 — 15.0 December 31, 2024 (2,693.5) (129.9) (313.8) — (3,137.2) Distribution systems Customer premises equipment Support equipment and buildings Assets under construction Total CHF in millions Property and equipment, net: Net carrying amount at December 31, 2023 681.7 208.3 1,058.2 347.5 2,295.7 Net carrying amount at December 31, 2024 427.8 232.8 1,158.1 519.7 2,338.5

INTANGIBLE ASSETS (Tables)

INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2024
Intangible Assets [Abstract]
Disclosure of detailed information about intangible assets	The rights are amortized on a straight-line basis over the contract term. Asset category Useful lives Software 3 to 5 years Licenses and rights 5 to 26 years Brands and customer relationships 6 to 10 years Other intangible assets 2 to 25 years Changes in the carrying amounts of the intangible assets are as follows: Brands and customers relationships Licenses and rights Software Other intangible assets Total CHF in millions Cost: January 1, 2023 1,972.0 652.1 523.3 18.3 3,165.7 Additions from business combinations 8.4 — — — 8.4 Additions 0.3 — 160.2 — 160.5 Retirements and disposals (27.4) — (48.3) — (75.7) Other 2.5 — — (1.1) 1.4 December 31, 2023 1,955.8 652.1 635.2 17.2 3,260.3 Additions — 2.0 99.9 — 101.9 Retirements and disposals — (153.5) (32.6) (8.0) (194.1) Reclassifications — — 76.4 — 76.4 Other 1.9 — — 3.6 5.5 December 31, 2024 1,957.7 500.6 778.9 12.8 3,250.0 Brands and customers relationships Licenses and rights Software Other intangible assets Total CHF in millions Accumulated amortization: January 1, 2023 (732.3) (252.7) (280.0) (1.6) (1,266.6) Amortization (322.0) (66.8) (143.6) (7.2) (539.6) Retirements and disposals 27.4 — 48.3 — 75.7 Other — — — 0.1 0.1 December 31, 2023 (1,026.9) (319.5) (375.3) (8.7) (1,730.4) Amortization (321.7) (69.0) (155.0) (4.2) (549.9) Retirements and disposals — 153.5 32.6 8.0 194.1 Reclassifications — — (65.5) — (65.5) Other — — (13.9) — (13.9) December 31, 2024 (1,348.6) (235.0) (577.1) (4.9) (2,165.6) Brands and customers relationships Licenses and rights Software Other intangible assets Total CHF in millions Intangible assets subject to amortization, net: Net carrying amount at 31 December 2023 928.9 332.6 259.9 8.5 1,529.9 Net carrying amount at 31 December 2024 609.1 265.6 201.8 7.9 1,084.4

GOODWILL (Tables)

GOODWILL (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill [Abstract]
Disclosure of reconciliation of changes in goodwill	Residential Business Wholesale Total CHF in millions Cost: January 1, 2023 4,580.7 1,098.3 327.3 6,006.3 Additions from business combinations 6.4 — — 6.4 December 31, 2023 4,587.1 1,098.3 327.3 6,012.7 Additions from business combinations — — — — December 31, 2024 4,587.1 1,098.3 327.3 6,012.7 Residential Business Wholesale Total CHF in millions Goodwill, net: Net carrying amount at 31 December 2023 4,587.1 1,098.3 327.3 6,012.7 Net carrying amount at 31 December 2024 4,587.1 1,098.3 327.3 6,012.7
Key Assumptions Used in Goodwill Impairment Calculations	The recoverable amount of all CGUs has been determined based on its value-in-use using a discounted cash flow (DCF) method. The key assumptions used are listed below: Key assumptions used in value in use calculations 2024 2023 Long-term growth rate — % 0.6 % WACC (pre-tax) 5.3 % 7.0 %

PROVISIONS (Tables)

PROVISIONS (Tables)	12 Months Ended
	Dec. 31, 2024
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]
Disclosure of other provisions	Asset retirement obligations Restructuring obligations Other provisions Total CHF in millions Provisions as of January 1, 2023 61.4 10.4 — 71.8 Provisions made during the period 2.0 28.5 29.9 60.4 Change in present value 2.5 — — 2.5 Provisions used during the period (1.8) (16.0) — (17.8) Provisions as of December 31, 2023 64.1 22.9 29.9 116.9 Thereof current — 22.9 29.9 52.8 Thereof non-current 64.1 — — 64.1 Provisions as of January 1, 2024 64.1 22.9 29.9 116.9 Provisions made during the period 2.1 1.9 — 4.0 Change in present value 2.4 — — 2.4 Provisions used during the period (4.6) (20.1) (29.9) (54.6) Provisions as of December 31, 2024 64.0 4.7 — 68.7 Thereof current — 4.7 — 4.7 Thereof non-current 64.0 — — 64.0

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2024
Income Taxes [Abstract]
Disclosure Of Income Tax Expense	Year ended December 31 2024 2023 2022 CHF in millions Current income tax expense (20.6) (17.3) (6.5) Current income tax benefit (expense) of prior periods (19.2) 1.0 0.2 Deferred income tax benefit 56.5 76.2 57.0 Total income tax benefit 16.7 59.9 50.7
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates And Average Effective Tax Rate	Year ended December 31 2024 2023 2022 CHF in millions Income (loss) before income taxes (378.5) (372.1) 33.3 Domestic income tax rate 18.3 % 18.4 % 18.4 % Expected income tax income/(expense) 69.4 68.4 (6.1) Effect of income taxed at differing tax rates 5.0 (3.7) (39.8) Non-deductible items (18.4) (9.9) (1.0) Non-taxable income — 0.1 0.9 Effect of changes in recognition of deferred tax assets (0.6) 3.2 92.3 Adjustments to deferred tax balances arising from tax rate changes — 0.5 3.3 Adjustments recognized for current and deferred tax of prior periods (40.3) 1.0 0.3 Other effects 1.6 0.3 0.8 Total income tax benefit 16.7 59.9 50.7
Disclosure Of Deferred Tax Assets And Deferred Tax Liabilities	Deferred tax assets and liabilities by origin of the temporary difference: December 31, 2024 Assets Liabilities CHF in millions Intangible assets — 135.2 Property, plant and equipment — 34.2 Unrealized foreign exchange results 26.5 — Derivatives — 4.8 Receivables — 3.9 Right-of-use assets 20.4 — Deferred revenue 0.1 20.1 Employee benefit obligations 1.4 — Provisions 8.9 0.3 Lease liabilities — 1.0 Other 0.1 0.4 Tax net operating loss carry forward 0.4 — Total 57.8 199.9 Netting of deferred tax assets and liabilities 34.2 (34.1) Reflected in the consolidated statements of financial position as follows: Deferred tax assets 23.6 — Deferred tax liabilities — 165.8 December 31, 2023 Assets Liabilities CHF in millions Intangible assets — 195.7 Property, plant and equipment — 43.5 Unrealized foreign exchange results — 206.9 Derivatives — 0.1 Receivables 0.1 — Right-of-use assets 19.3 — Deferred revenue 0.1 12.7 Employee benefit obligations 1.4 — Provisions 3.3 3.7 Lease liabilities — 0.3 Other — 0.4 Tax net operating loss carry forward 232.4 — Total 256.6 463.3 Netting of deferred tax assets and liabilities 256.6 (256.6) Reflected in the consolidated statements of financial position as follows: Deferred tax liabilities — 206.7 Net change in deferred tax assets and liabilities 2024 2023 2022 CHF in millions Opening balance at the beginning of the period January 1 206.7 294.7 351.0 Changes recognized in the consolidated statements of income or loss (56.6) (76.2) (57.0) Changes recognized in the consolidated statements of comprehensive income or loss (1.2) (5.4) 1.8 Changes recognized in the consolidated statements of changes in equity (7.9) (8.9) (1.1) Change in scope of consolidation / goodwill adjustment — 3.7 Foreign currency effects 1.2 (1.2) Closing balance at the end of the period December 31 142.2 206.7 294.7
Disclosure Of Unused tax losses For Which No Deferred Tax Asset Recognised	As of 31 December 2024 and 31 December 2023 Sunrise has the following unused tax loss carryforwards for which no deferred tax assets are recognized: December 31 2024 2023 CHF in millions Due to expire within 1 year — — Due to expire within 2 to 7 years 16.5 — Due to expire in more than 7 years — — Amount not due to expire — 109.4 Total 16.5 109.4

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings per share [abstract]
Earnings per share	Year ended December 31, 2024 Class A Class B Allocation of net income (loss) attributable to Sunrise share classes (in CHF million) (352.7) (13.1) Weighted average number of shares outstanding 69,619,207 25,977,316 Adjusted weighted average of shares outstanding 69,619,207 25,977,316 Basic and diluted earnings (loss) per share (in CHF) (5.1) (0.5) Year ended December 31, 2023 Class A Class B Allocation of net income (loss) attributable to Sunrise share classes (in CHF million) (304.8) (11.3) Weighted average number of shares outstanding 69,759,702 25,977,316 Adjusted weighted average of shares outstanding 69,759,702 25,977,316 Basic and diluted earnings (loss) per share (in CHF) (4.4) (0.4) Year ended December 31, 2022 Class A Class B Allocation of net income (loss) attributable to Sunrise share classes (in CHF million) 77.6 2.9 Weighted average number of shares outstanding 69,759,702 25,977,316 Adjusted weighted average of shares outstanding 69,759,702 25,977,316 Basic and diluted earnings (loss) per share (in CHF) 1.1 0.1 The number of shares outstanding is shown in absolute units below, rather than time-weighted units. 2024 Class A Class B Shares distributed as of spin date 69,759,702 25,977,316 Less treasury shares (1,000,000) - Shares distributed from treasury shares 99,186 - Shares Outstanding as of December 31 68,858,888 25,977,316
Disclosure of instruments with potential future dilutive effect not included in calculation of diluted earnings per share	The table below shows all potential ordinary shares, including those equity awards which are excluded from the calculation of the diluted earnings per share due to their anti-dilutive impact. The PSU plans shown below would not be included due to the performance condition not yet being achieved, however they are displayed below to give a holistic overview of potential dilution in the future. The table below shows absolute units, rather than the 2024 time-weighted units. 2024 PSU plans 421,608 RSU plans 399,399 SAR plans 461,244 Legacy LG RSU plans 1,402,510 Potential ordinary shares of Class A 2,684,761

FINANCIAL INCOME AND EXPENSES (

FINANCIAL INCOME AND EXPENSES (Tables)	12 Months Ended
	Dec. 31, 2024
Financial Income And Expenses [Abstract]
Disclosure Of Finance Cost and Finance Income	December 31 2024 2023 2022 CHF in millions Finance expenses: Interest expense (432.9) (431.1) (338.5) Losses on debt modification and extinguishment (4.0) (0.1) — Realized and unrealized losses on derivative instruments — (524.5) — Foreign currency transaction losses (295.2) — — Gains (losses) due to changes in fair values of certain investments and debt, net (6.1) — — Other expense, net (4.4) (1.5) (1.7) Total (742.6) (957.2) (340.2) Finance income: Interest income 8.1 3.0 1.5 Realized and unrealized gains on derivative instruments 249.6 — 348.4 Foreign currency transaction gains — 568.6 2.8 Gains (losses) due to changes in fair values of certain investments and debt, net — 3.1 104.0 Total 257.7 574.7 456.7

BORROWINGS (Tables)

BORROWINGS (Tables)	12 Months Ended
	Dec. 31, 2024
Borrowings1 [Abstract]
Schedules of Debt and Debt Facilities	The CHF equivalents of the components of third-party debt are as follows: December 31, 2024 Principal amount Weighted average interest rate (%) 10 Unused borrowing capacity December 31 December 31 2024 2023 CHF in millions Sunrise holding bank facility 6.64% 662.0 2,239.0 3,043.3 Sunrise holding SPE notes 4.58% 1,468.8 1,397.1 Sunrise holding senior note 4.80% 629.3 693.3 Vendor financing 3.08% 350.0 310.1 Total third-party debt before deferred financing costs, discounts, premiums and accrued interest 5.48% 662.0 4,687.1 5,443.8 10 Represents the weighted average interest rate in effect at 31 December 2024 for all borrowings outstanding pursuant to each debt instrument, including any applicable margin. The interest rates presented represent stated rates and do not include the impact of derivative instruments, deferred financing costs, original issue premiums or discounts and commitment fees, all of which affect our overall cost of borrowing. Including the effects of derivative instruments, original issue premiums or discounts and commitment fees, but excluding the impact of deferred financing costs, the weighted average interest rate on our aggregate third-party variable- and fixed-rate indebtedness was 3.0% at 31 December 2024. The weighted average interest rate calculation includes principal amounts outstanding associated with all of our secured and unsecured borrowings. For information regarding our derivative instruments, see note 24. The following table provides a reconciliation of total third-party debt before deferred financing costs, discounts, premiums and accrued interest to total debt including interest and related party debt: December 31 2024 2023 CHF in millions Total third-party debt before deferred financing costs, discounts, premiums and accrued interest: 4,687.1 5,443.8 Deferred financing costs, discounts and premiums, net (10.3) (18.1) Total carrying amount of third-party debt 4,676.8 5,425.7 Accrued interest on third-party debt 57.4 60.4 Related party debt (note 26) — 51.2 Total debt including interest and related party debt 4,734.2 5,537.3 Current portion of debt 407.4 370.5 Non-current portion of debt 4326.8 5166.8 The Sunrise holding bank facility is the senior secured credit facility of certain consolidated entities of Sunrise. The details of Sunrise's borrowings under the Sunrise holding bank facility are summarized in the following tables: Year ended December 31, 2024 Sunrise Holding Bank facilities Maturity Interest rate Facility amount (in borrowing currency) Outstanding principal amount Unused borrowing capacity Carrying value in millions CHF millions AT April 30, 2028 Term SOFR +2.4% US$700.0 635.4 — 633.8 AU April 30, 2029 EURIBOR +2.5% € 400 375.8 — 374.7 AX January 31, 2029 Term SOFR +3.0% US$1,044.7 948.3 — 944.0 AY January 31, 2029 EURIBOR +3.0% € 297.6 279.6 — 278.8 Revolving Facility A May 31, 2026 EURIBOR +2.5% € 10 — 9.4 — Revolving Facility B September 30, 2029 EURIBOR +2.5% € 720 — 652.6 — Total 2,239.0 662.0 2,231.2 Year ended December 31, 2023 Sunrise Holding Bank Facilities Maturity Interest rate Facility amount (in borrowing currency) Outstanding principal amount Unused borrowing capacity Carrying value in millions CHF millions AT April 30, 2028 Term SOFR +2.25% US$700.0 587.4 — 585.6 AU April 30, 2029 EURIBOR +2.5% € 400.0 371.4 — 370.1 AX January 31, 2029 Term SOFR +3.0% US$1,717.0 1,441.0 — 1,432.8 AY January 31, 2029 EURIBOR +3.0% € 693.0 643.5 — 641.0 Revolving Facility A May 31, 2026 EURIBOR +2.5% € 88.0 — 60.4 — Revolving Facility B September 30, 2029 EURIBOR +2.5% € 660.0 — 612.8 — Total 3,043.3 673.2 3,029.5 The details of the Sunrise holding SPE notes are summarized in the following tables: Year ended December 31, 2024 Outstanding principal amount Sunrise holding SPE notes Maturity Interest rate Original issue amount Borrowing currency CHF equivalent Carrying value CHF in millions 2031 Sunrise holding senior secured notes July 15, 2031 4.88% US$1,250.0 US$1,230.0 1,116.6 1,115.9 UPCB finance VII euro notes June 15, 2029 3.63% € 600.0 € 374.9 352.2 351.3 Total 1,468.8 1,467.2 Year ended December 31, 2023 Outstanding principal amount Sunrise holding SPE notes Maturity Interest rate Original issue amount Borrowing currency CHF equivalent Carrying value CHF in millions 2031 Sunrise holding senior secured notes July 15, 2031 4.88% US$1,250.0 US$1,250.0 1,049.0 1,048.0 UPCB finance VII euro notes June 15, 2029 3.63% € 600.0 € 374.9 348.1 346.8 Total senior secured notes 1,397.1 1,394.8 The details of the Sunrise holding senior notes are summarized in the following tables: Year ended December 31, 2024 Outstanding principal amount Sunrise Notes Maturity Interest rate Original issue amount Borrowing currency CHF equivalent Carrying value CHF in millions 3.875% senior notes June 15, 2029 3.88% € 635.00 € 287.9 270.4 269.9 5.50% senior notes January 14, 2028 5.50% US$550.0 US$395.3 358.9 358.1 Total 629.3 628.0 Year ended December 31, 2023 Outstanding principal amount Sunrise holding senior notes Maturity Interest rate Original issue amount Borrowing currency CHF equivalent Carrying value CHF in millions 3.875% senior notes June 15, 2029 3.875% € 635.0 € 337.9 313.7 312.8 5.50% senior notes January 14, 2028 5.500% US$550.0 US$452.3 379.6 378.5 Total 693.3 691.3

FINANCIAL INSTRUMENTS & RISK (T

FINANCIAL INSTRUMENTS & RISK (Tables)	12 Months Ended
	Dec. 31, 2024
Financial Instruments [Abstract]
Sensitivity analysis for types of market risk	Foreign currency sensitivity December 31 Effect on profit before tax Changes in % 2024 2023 CHF in millions EUR/CHF 10 177.4 279.1 USD/CHF 10 380.4 477.8
Disclosure of maturity analysis for non-derivative financial liabilities	The table below summarizes the maturity profile of Sunrise's financial liabilities based on contractual undiscounted cash outflows (inflows). All interest payments and repayments of financial liabilities are based on contractual agreements. Interest payments are determined using zero-coupon rates. For floating rate instruments, the calculation is computed using the base rate and applicable margin prevailing as of 31 December 2024. December 31, 2024 <1 year Between 1 and 2 years Between 2 and 5 years Over 5 years Total CHF in millions Trade payables and other payables 741.7 14.7 15.0 15.0 786.4 Borrowings – notional — — 3,220.6 1,116.5 4,337.1 Borrowings – interest 246.1 484.2 360.8 54.4 1,145.5 Lease liabilities (undiscounted) 164.1 152.0 425.3 925.7 1,667.1 Derivatives 175.7 127.7 9.2 — 312.6
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments	The development of the allowance for expected credit losses of trade receivables for the indicated periods is set forth below: 2024 2023 CHF in millions Allowance at January 1 (30.6) (22.2) Provisions for impairment of trade receivables (30.8) (15.6) Write-off of receivables 29.5 7.2 Allowance at December 31 (31.9) (30.6)
Disclosure of financial assets	The detailed aging of Sunrise's trade receivables and the related allowance for expected credit losses is set forth below: December 31, 2024 Current 1-30 days (overdue) 31-60 days 61-90 days 91-120 days 121-365 days Over 365 days Total Trade receivables gross 153.8 100.9 15.7 12.7 6.2 38.2 — 327.5 Trade receivable gross - Aging % 47.0 % 30.8 % 4.8 % 3.9 % 1.9 % 11.7 % — % 100.0 % Trade receivables - affiliates 0.2 Allowance for doubtful accounts (1.0) (0.9) (2.4) (1.8) (1.7) (24.1) — (31.9) Allowance for doubtful accounts - Aging % 3.1 % 2.8 % 7.6 % 5.6 % 5.3 % 75.6 % — % 100.0 % Trade receivables - Provision % 0.6 % 0.9 % 15.4 % 14.2 % 27.3 % 63.1 % — % 9.7 % Unbilled revenue 57.2 Current trade receivables, net 353.0 Non-current trade receivables gross 34.3 — 34.3 Non-current trade receivables gross - Aging % 100.0 % — % — % — % — % — % — % 100.0 % Non-current trade receivables, net 34.3 December 31, 2023 Current 1-30 days (overdue) 31-60 days 61-90 days 91-120 days 121-365 days Over 365 days Total Trade receivables gross 227.2 42.2 22.4 10.1 9.7 66.4 — 378.0 Trade receivable gross - Aging % 60.1 % 11.2 % 5.9 % 2.7 % 2.6 % 17.6 % — % 100.0 % Trade receivables - affiliates (0.1) Allowance for doubtful accounts (0.8) (0.6) (2.1) (1.4) (1.1) (24.6) — (30.6) Allowance for doubtful accounts - Aging % 2.5 % 1.8 % 6.9 % 4.4 % 3.5 % 80.8 % — % 100.0 % Trade receivables - Provision % 0.3 % 1.3 % 9.4 % 13.4 % 11.0 % 37.2 % — % 8.1 % Unbilled revenue 43.6 Current trade receivables, net 390.9 Non-current trade receivables gross 44.0 — — — — — — 44.0 Non-current trade receivables gross - Aging % 100.0 % — % — % — % — % — % — % — % — % — % — % — % 100.0 % Non-current trade receivables, net 44.0 December 31, 2024 December 31, 2023 Fair value level Carrying amount Fair value Carrying amount Fair value Current assets carried at FVTPL Derivative financial instruments II 162.5 162.5 237.0 237.0 Non-current assets carried at FVTPL Derivative financial instruments II 5.1 5.1 90.6 90.6 Non-current assets carried at amortized cost Related party long-term receivables II — — 202.5 202.5 Total financial assets 167.6 167.6 530.1 530.1 Current liabilities carried at FVTPL Derivative financial instruments II 179.3 179.3 179.7 179.7 Current liabilities carried at amortized cost Vendor financing II 350.0 350.0 310.1 310.1 Accrued interest II 57.4 57.4 60.4 60.4 Non-current liabilities carried at FVTPL Derivative financial instruments II 421.1 421.1 755.1 755.1 Non-current liabilities carried at amortized cost Third-party debt I 4,326.8 4,085.8 5,115.6 4,944.4 Related party long-term payables II — — 51.2 51.2 Total financial liabilities 5,334.6 5,093.6 6,472.1 6,300.9
Disclosure of financial liabilities	These include cash and cash equivalents, trade receivables, accrued liabilities, lease liabilities and trade payables, as well as other receivables and liabilities whose carrying amount corresponds to a reasonable estimation of their fair value. December 31, 2024 December 31, 2023 Fair value level Carrying amount Fair value Carrying amount Fair value Current assets carried at FVTPL Derivative financial instruments II 162.5 162.5 237.0 237.0 Non-current assets carried at FVTPL Derivative financial instruments II 5.1 5.1 90.6 90.6 Non-current assets carried at amortized cost Related party long-term receivables II — — 202.5 202.5 Total financial assets 167.6 167.6 530.1 530.1 Current liabilities carried at FVTPL Derivative financial instruments II 179.3 179.3 179.7 179.7 Current liabilities carried at amortized cost Vendor financing II 350.0 350.0 310.1 310.1 Accrued interest II 57.4 57.4 60.4 60.4 Non-current liabilities carried at FVTPL Derivative financial instruments II 421.1 421.1 755.1 755.1 Non-current liabilities carried at amortized cost Third-party debt I 4,326.8 4,085.8 5,115.6 4,944.4 Related party long-term payables II — — 51.2 51.2 Total financial liabilities 5,334.6 5,093.6 6,472.1 6,300.9
Disclosure of reconciliation of liabilities arising from financing activities	Reconciliation of movements in liabilities to cash flows from financing activities Debt and accrued interest Derivative (assets)/liabilities Lease liabilities Total CHF in millions Balance as of January 1, 2024 5,537.3 607.3 1,257.6 7,402.2 Cash flows from financing activities: Interest paid (359.2) — (61.0) (420.2) Vendor financing additions 363.4 — — 363.4 Repayments of debt and lease liabilities (1,064.7) — (114.4) (1,179.1) Principal payments on operating-related vendor financing (327.9) — — (327.9) Principal payments on capital-related vendor financing (49.1) — — (49.1) Net cash received related to derivative instruments — 52.3 — 52.3 Total cash flows from financing activities (1,437.5) 52.3 (175.4) (1,560.6) Losses on debt extinguishment 3.9 — — 3.9 Realized and unrealized (gains) losses on derivative instruments, net — (249.6) — (249.6) Interest accruals 358.2 — 69.8 428.0 Assets acquired under leases — — 126.3 126.3 Assets acquired under capital-related vendor financing arrangements, including VAT 52.1 — — 52.1 Effect of changes in foreign exchange rates 271.8 15.6 — 287.4 Other related party charges (51.8) — — (51.8) Other changes 0.2 7.3 (59.0) (51.5) Balance as of December 31, 2024 4,734.2 432.9 1,219.3 6,386.4 Debt and accrued interest Derivative (assets)/liabilities Lease liabilities Total CHF in millions Balance as of January 1, 2023 5,942.1 (15.5) 1,347.9 7,274.5 Cash flows from financing activities: Interest paid (364.1) — (58.4) (422.5) Vendor financing additions 271.2 — — 271.2 Repayments of debt and lease liabilities — — (107.6) (107.6) Principal payments on operating-related vendor financing (171.8) — — (171.8) Principal payments on capital-related vendor financing (124.8) — — (124.8) Payment of financing costs and debt premiums 0.1 — — 0.1 Net cash received related to derivative instruments — 117.1 — 117.1 Total cash flows from financing activities (389.4) 117.1 (166.0) (438.3) Realized and unrealized (gains) losses on derivative instruments, net — 524.4 — 524.4 Interest accruals 358.7 — 67.9 426.6 Assets acquired under leases — — 56.2 56.2 Assets acquired under capital-related vendor financing arrangements, including VAT 77.6 — — 77.6 Effect of changes in foreign exchange rates (453.4) (13.3) — (466.7) Other related party charges 1.7 — — 1.7 Other changes 0.1 (5.4) (48.4) (53.7) Balance as of December 31, 2023 5,537.3 607.3 1,257.6 7,402.2 Debt and accrued interest Derivative (assets)/liabilities Lease liabilities Total CHF in millions Balance as of January 1, 2022 6,882.3 304.0 1,120.1 8,306.4 Cash flows from financing activities: Interest paid (267.6) — (61.6) (329.2) Vendor financing additions 148.2 — — 148.2 Repayments of debt and lease liabilities (899.4) — (112.4) (1,011.8) Principal payments on operating-related vendor financing (198.2) — — (198.2) Principal payments on capital-related vendor financing (86.3) — — (86.3) Payment of financing costs and debt premiums (26.3) — — (26.3) Net cash received related to derivative instruments — (4.9) — (4.9) Related-party payments (149.2) — — (149.2) Total cash flows from financing activities (1,478.8) (4.9) (174.0) (1,657.7) Losses on debt extinguishment (2.8) — — (2.8) Realized and unrealized (gains) losses on derivative instruments, net — (348.4) — (348.4) Interest accruals 272.8 — 65.3 338.1 Assets acquired under leases — — 343.9 343.9 Assets acquired under capital-related vendor financing arrangements, including VAT 117.5 — — 117.5 Effect of changes in foreign exchange rates (47.8) (1.2) — (49.0) Other related party charges 205.7 — — 205.7 Other changes (6.8) 35.0 (7.4) 20.8 Balance as of December 31, 2022 5,942.1 (15.5) 1,347.9 7,274.5

INVESTMENTS (Tables)

INVESTMENTS (Tables)	12 Months Ended
	Dec. 31, 2024
Investments Accounted For Using Equity Method1 [Abstract]
Details of Investments Accounted For Using the Equity Method	The details of investments accounted for using the equity method are set forth below: December 31 2024 2023 CHF in millions Balance at 1 January 52.5 55.9 Additions 0.6 0.0 Share of net results 1.3 (0.3) Dividends (3.0) (3.1) Other (3.0) — Balance at 31 December 48.4 52.5

RELATED PARTY TRANSACTIONS (Tab

RELATED PARTY TRANSACTIONS (Tables)	12 Months Ended
	Dec. 31, 2024
Related Party [Abstract]
Disclosure of transactions between related parties	Their compensation is as follows: Remuneration of the Executive Leadership Team and Board of Directors Year ended December 31 2024 2023 2022 CHF in millions Wages, salaries and social security charges 8.4 6.2 8.0 Pension costs 0.8 0.8 1.2 Share-based compensation 6.6 6.9 9.1 Termination benefits 0.7 2.5 0.7 Total 16.5 16.4 19.0 The following table provides details of related-party transactions: December 31 2024 2023 2022 CHF in millions Credits (charges) included in: Revenue 3.1 4.6 2.9 Direct costs (3.8) (2.3) (5.6) Personnel expenses (15.9) (18.6) (23.0) Other operating expenses (116.9) (118.1) (183.3) Included in operating income (loss) (133.5) — (134.4) (209.0) Finance expense (1.5) (1.7) — Finance income 3.0 2.1 1.1 Included in net income (loss) (132.0) (134.0) (207.9) Property and equipment transfers in, net 11.3 23.7 4.9 The following table provides details of Sunrise's related-party balances: December 31 2024 2023 CHF in millions Current receivables (a) 1.8 6.1 Long-term note receivables — 202.5 1.8 208.6 Accounts payable 0.3 14.5 Accrued other liabilities 20.4 38.8 Non-current related party loan — 51.2 Other non-current liabilities 0.1 1.8 20.8 106.3 (a) These receivables are non-interest bearing, may be cash or loan settled and are included within trade receivables, net and other current assets.

BUSINESS COMBINATIONS (Tables)

BUSINESS COMBINATIONS (Tables)	12 Months Ended
	Dec. 31, 2024
Acquisitions [Abstract]
Disclosure of detailed information about business combination	Fair value recognized on acquisition (CHF in millions) Assets: Cash and cash equivalents 5.2 Accounts receivable 3.6 Other receivables 0.6 Inventories 0.1 Accrued income 0.3 Property, plant and equipment 73.7 Intangible assets 8.1 91.6 Liabilities: Accounts payable (2.6) Other current liabilities (0.9) Accrued liabilities (0.7) Deferred tax liabilities (3.5) (7.7) Total identifiable net assets at fair value 83.9 Goodwill arising on acquisition 6.4 Total consideration transferred 90.3 Cash acquired with the subsidiary (5.2) Net cash paid for acquisition 85.1

SUBSIDIAIRIES AND ASSOCIATES (T

SUBSIDIAIRIES AND ASSOCIATES (Tables)	12 Months Ended
	Dec. 31, 2024
Interests in Other Entities [Abstract]
Disclosure of interests in subsidiaries	The following table lists the principal legal entities which are included in the consolidated financial statements: Company name Operating purpose Registered office Currency December 31, 2024 capital and voting rights share in % December 31, 2023 capital and voting rights share in % CH Media TV AG 3 Media Switzerland CHF 20.00 20.00 ello communications S.A. Telecommunications Switzerland CHF 60.00 60.00 ITV Betriebsgesellschaft GmbH 3 Telecommunications Switzerland CHF 50.00 50.00 Naxoo S.A 3 Telecommunications Switzerland CHF 48.90 48.90 REGIONALE GEMEINSCHAFTS-ANTENNEN-ANLAGE SPIEZ AG REGAS 3 Telecommunications Switzerland CHF 30.00 30.00 Sitel S.A. Telecommunications Switzerland CHF 66.70 66.70 Sunrise Financing Partnership Holding United States CHF 100.00 100.00 Sunrise FinCo I B.V. Holding Netherlands CHF 100.00 100.00 Sunrise FinCo II B.V. Holding Netherlands CHF 100.00 100.00 Sunrise GmbH Telecommunications Switzerland CHF 100.00 100.00 Sunrise HoldCo I B.V. Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo II B.V. Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo III B.V. Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo IV B.V. 1 Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo V B.V. Holding Netherlands CHF 100.00 — Sunrise HoldCo VI B.V. 2 Holding Netherlands CHF 100.00 — Sunrise Portugal S.A. Telecommunications Portugal CHF 100.00 100.00 Swiss Open Fiber AG Telecommunications Switzerland CHF 100.00 100.00 Swiss-Ski Store GmbH 3 Other Switzerland CHF 50.00 — TELDAS GmbH 3 Telecommunications Switzerland CHF 23.00 23.00 Télédistal S.A. Telecommunications Switzerland CHF 38.90 38.90 Télévaux S.A. Telecommunications Switzerland CHF 80.00 80.00 UPCB Finance VII Limited 4 Holding Cayman Islands CHF — — 1) In 2023, Sunrise HoldCo IV B.V. was directly held by Sunrise HoldCo V B.V. (former Liberty Global Europe Financing B.V.).All other entities were indirect subsidiaries of Sunrise HoldCo V B.V. (former Liberty Global Europe Financing B.V). 2) In 2024, following the spin-off, Sunrise HoldCo VI B.V. is directly held. All other entities are indirect subsidiaries of Sunrise Communications AG. 3) Investment is accounted for using the equity method. 4) As of 31 December 2024, no shares are held, but the entity is controlled by Sunrise.
Disclosure of interests in associates	The following table lists the principal legal entities which are included in the consolidated financial statements: Company name Operating purpose Registered office Currency December 31, 2024 capital and voting rights share in % December 31, 2023 capital and voting rights share in % CH Media TV AG 3 Media Switzerland CHF 20.00 20.00 ello communications S.A. Telecommunications Switzerland CHF 60.00 60.00 ITV Betriebsgesellschaft GmbH 3 Telecommunications Switzerland CHF 50.00 50.00 Naxoo S.A 3 Telecommunications Switzerland CHF 48.90 48.90 REGIONALE GEMEINSCHAFTS-ANTENNEN-ANLAGE SPIEZ AG REGAS 3 Telecommunications Switzerland CHF 30.00 30.00 Sitel S.A. Telecommunications Switzerland CHF 66.70 66.70 Sunrise Financing Partnership Holding United States CHF 100.00 100.00 Sunrise FinCo I B.V. Holding Netherlands CHF 100.00 100.00 Sunrise FinCo II B.V. Holding Netherlands CHF 100.00 100.00 Sunrise GmbH Telecommunications Switzerland CHF 100.00 100.00 Sunrise HoldCo I B.V. Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo II B.V. Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo III B.V. Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo IV B.V. 1 Holding Netherlands CHF 100.00 100.00 Sunrise HoldCo V B.V. Holding Netherlands CHF 100.00 — Sunrise HoldCo VI B.V. 2 Holding Netherlands CHF 100.00 — Sunrise Portugal S.A. Telecommunications Portugal CHF 100.00 100.00 Swiss Open Fiber AG Telecommunications Switzerland CHF 100.00 100.00 Swiss-Ski Store GmbH 3 Other Switzerland CHF 50.00 — TELDAS GmbH 3 Telecommunications Switzerland CHF 23.00 23.00 Télédistal S.A. Telecommunications Switzerland CHF 38.90 38.90 Télévaux S.A. Telecommunications Switzerland CHF 80.00 80.00 UPCB Finance VII Limited 4 Holding Cayman Islands CHF — — 1) In 2023, Sunrise HoldCo IV B.V. was directly held by Sunrise HoldCo V B.V. (former Liberty Global Europe Financing B.V.).All other entities were indirect subsidiaries of Sunrise HoldCo V B.V. (former Liberty Global Europe Financing B.V). 2) In 2024, following the spin-off, Sunrise HoldCo VI B.V. is directly held. All other entities are indirect subsidiaries of Sunrise Communications AG. 3) Investment is accounted for using the equity method. 4) As of 31 December 2024, no shares are held, but the entity is controlled by Sunrise.

GENERAL INFORMATION (Details)

GENERAL INFORMATION (Details) SFr / shares in Units, SFr in Thousands	Nov. 12, 2024	May 03, 2024 CHF (SFr) SFr / shares shares	Dec. 31, 2024 SFr / shares shares	Dec. 31, 2023 shares
Class A Common Shares
Disclosure of classes of share capital [line items]
Number of shares issued (in shares)			68,858,888	194
Par value per share (in CHF per share) | SFr / shares			SFr 0.10
Number of shares outstanding, less treasury shares (in shares)		68,759,702
Number of shares outstanding (in shares)		69,759,702	68,858,888	194
Class B Common Shares
Disclosure of classes of share capital [line items]
Par value per share (in CHF per share) | SFr / shares			SFr 0.01
Number of shares outstanding (in shares)		25,977,316	25,977,316
Class A ADS Common Shares
Disclosure of classes of share capital [line items]
Exchange ratio for share conversion	0.2
Class B ADS Common Shares
Disclosure of classes of share capital [line items]
Exchange ratio for share conversion	2
Liberty Global Ltd
Disclosure of classes of share capital [line items]
Consideration paid (received) | SFr		SFr 100
Number of shares issued (in shares)		1,000,000
Par value per share (in CHF per share) | SFr / shares		SFr 0.10
Sunrise HoldCo VI BV | Class A Common Shares
Disclosure of classes of share capital [line items]
Number of shares issued (in shares)		68,759,702
Par value per share (in CHF per share) | SFr / shares		SFr 0.10
Sunrise HoldCo VI BV | Class B Common Shares
Disclosure of classes of share capital [line items]
Number of shares issued (in shares)		25,977,316
Par value per share (in CHF per share) | SFr / shares		SFr 0.01

MATERIAL ACCOUNTING POLICIES -

MATERIAL ACCOUNTING POLICIES - Exchange Rates (Details)	12 Months Ended
	Dec. 31, 2024 € / SFr $ / SFr	Dec. 31, 2023 $ / SFr € / SFr	Dec. 31, 2022 € / SFr $ / SFr
Euro
Interest Rate and Interest Differential Analysis [Line Items]
Spot rates | € / SFr	1.0645	1.077	1.0128
Average rates | € / SFr	1.0502	1.0295	0.9948
US Dollar
Interest Rate and Interest Differential Analysis [Line Items]
Spot rates | $ / SFr	1.1016	1.1916	1.0847
Average rates | $ / SFr	1.1362	1.1135	1.0478

MATERIAL ACCOUNTING POLICIES _2

MATERIAL ACCOUNTING POLICIES - Property, Plant and Equipment Useful Lives (Details)	12 Months Ended
	Dec. 31, 2024
Minimum | Support equipment and buildings
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives	3 years
Minimum | Distribution systems
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives	3 years
Minimum | Customer premises equipment ('CPE')
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives	4 years
Maximum | Support equipment and buildings
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives	33 years
Maximum | Distribution systems
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives	30 years
Maximum | Customer premises equipment ('CPE')
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives	5 years

MATERIAL ACCOUNTING POLICIES _3

MATERIAL ACCOUNTING POLICIES - Intangible Assets Useful Lives (Details)	12 Months Ended
	Dec. 31, 2024
Software
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	5 years
Minimum | Software
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	3 years
Minimum | Licenses and rights
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	5 years
Minimum | Brands and customers relationships
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	6 years
Minimum | Other intangible assets
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	2 years
Maximum | Software
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	5 years
Maximum | Licenses and rights
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	26 years
Maximum | Brands and customers relationships
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	10 years
Maximum | Other intangible assets
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	25 years

SEGMENT REPORTING - Narrative (

SEGMENT REPORTING - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 segment
Operating Segments [Abstract]
Number of operating segments	3

SEGMENT REPORTING - Segment Inf

SEGMENT REPORTING - Segment Information (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of operating segments [line items]
Revenue	SFr 3,018	SFr 3,035.2	SFr 3,035.2
Direct costs	(830.1)	(834.6)	(819.6)
Indirect costs	(966.4)	(961.1)	(947.1)
Lease expense	(199.4)	(195.9)	(210.7)
Adj. EBITDA after lease expense (EBITDAaL)	1,022.1	1,043.6	1,057.8
Depreciation and amortization	(917.9)	(992.1)	(1,028.8)
Share-based compensation, restructuring & other	(69)	(108.6)	(179.7)
Finance income/(expense)	(413.8)	(315)	184
Income tax benefit	16.7	59.9	50.7
Net income (loss)	(361.9)	(312.2)	84
Residential customers
Disclosure of operating segments [line items]
Revenue	2,173.1	2,247.1	2,275.5
Direct costs	(515.2)	(537.6)	(538.4)
Indirect costs	(401.5)	(417.5)	(417.8)
Lease expense	(52)	(51)	(39.9)
Adj. EBITDA after lease expense (EBITDAaL)	1,204.4	1,241	1,279.4
Business customers & Wholesale
Disclosure of operating segments [line items]
Revenue	830.3	776.6	752.3
Direct costs	(299.5)	(271)	(267.7)
Indirect costs	(115.8)	(115.4)	(111.7)
Lease expense	(13.5)	(11.2)	(10.4)
Adj. EBITDA after lease expense (EBITDAaL)	401.5	379	362.5
Infrastructure & Support functions
Disclosure of operating segments [line items]
Revenue	14.6	11.5	7.4
Direct costs	(15.4)	(26)	(13.5)
Indirect costs	(449.1)	(428.2)	(417.6)
Lease expense	(133.9)	(133.7)	(160.4)
Adj. EBITDA after lease expense (EBITDAaL)	SFr (583.8)	SFr (576.4)	SFr (584.1)

REVENUE FROM CONTRACTS WITH C_3

REVENUE FROM CONTRACTS WITH CUSTOMERS - Revenue by Major Category and Reportable Segment (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	SFr 3,018	SFr 3,035.2	SFr 3,035.2
Fixed
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	1,484.8	1,499.1	1,519.6
Fixed | Subscription
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	1,281.2	1,316.5	1,350.3
Fixed | Non-Subscription And Hardware
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	203.6	182.6	169.3
Mobile
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	1,385	1,388.5	1,374.3
Mobile | Subscription
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	1,099.7	1,107.6	1,095.4
Mobile | Non-Subscription And Hardware
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	285.3	280.9	278.9
Product and Service Other
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	148.2	147.6	141.3
Residential customers
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	2,173.1	2,247.1	2,275.5
Residential customers | Unadjusted Difference
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue		2,247.2
Residential customers | Fixed
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	1,001.8	1,061.7	1,088.3
Residential customers | Fixed | Subscription
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	987.8	1,043.1	1,079.6
Residential customers | Fixed | Non-Subscription And Hardware
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	14	18.6	8.7
Residential customers | Mobile
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	1,041.1	1,052.3	1,053.5
Residential customers | Mobile | Subscription
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	833.5	852.9	854.8
Residential customers | Mobile | Non-Subscription And Hardware
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	207.6	199.4	198.7
Residential customers | Product and Service Other
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	130.2	133.2	133.7
Business customers & Wholesale
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	830.3	776.6	752.3
Business customers & Wholesale | Unadjusted Difference
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue		776.5
Business customers & Wholesale | Fixed
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	483	437.4	430.6
Business customers & Wholesale | Fixed | Subscription
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	293.4	273.4	270
Business customers & Wholesale | Fixed | Non-Subscription And Hardware
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	189.6	164	160.6
Business customers & Wholesale | Mobile
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	343.9	336.2	320.8
Business customers & Wholesale | Mobile | Subscription
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	266.2	254.7	240.6
Business customers & Wholesale | Mobile | Non-Subscription And Hardware
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	77.7	81.5	80.2
Business customers & Wholesale | Product and Service Other
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	3.4	2.9	0.9
Infrastructure & Support functions
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	14.6	11.5	7.4
Infrastructure & Support functions | Fixed
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	0	0	0.7
Infrastructure & Support functions | Fixed | Subscription
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	0	0	0.7
Infrastructure & Support functions | Fixed | Non-Subscription And Hardware
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	0	0	0
Infrastructure & Support functions | Mobile
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	0	0	0
Infrastructure & Support functions | Mobile | Subscription
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	0	0	0
Infrastructure & Support functions | Mobile | Non-Subscription And Hardware
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	0	0	0
Infrastructure & Support functions | Product and Service Other
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue	SFr 14.6	SFr 11.5	SFr 6.7

REVENUE FROM CONTRACTS WITH C_4

REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details)	12 Months Ended
	Dec. 31, 2024
Subscription Revenue [Line Items]
Revenue from contracts with customers, mobile subscriptions, maximum contract term	60 days
Revenue from contracts with customers, residential services, minimum contract term	12 months
Revenue from contracts with customers, combined contracts with promotions, typical minimum contract term	24 months
Minimum
Subscription Revenue [Line Items]
Revenue from contracts with customers, business to business service contracts, typical contract term	1 year
Maximum
Subscription Revenue [Line Items]
Revenue from contracts with customers, business to business service contracts, typical contract term	5 years

REVENUE FROM CONTRACTS WITH C_5

REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Assets (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue From Contracts With Customers [Abstract]
Contract assets	SFr 27.8	SFr 31.7	SFr 22.5

REVENUE FROM CONTRACTS WITH C_6

REVENUE FROM CONTRACTS WITH CUSTOMERS - Performance Obligations Satisfied or Partially Satisfied in Previous Periods (Details) SFr in Millions	Dec. 31, 2024 CHF (SFr)
Within 1 year
Disclosure of transaction price allocated to remaining performance obligations [line items]
Telecommunications services (mobile and fixed)	SFr 56.9
Between 1 and 2 years
Disclosure of transaction price allocated to remaining performance obligations [line items]
Telecommunications services (mobile and fixed)	15
Between 2 and 3 years
Disclosure of transaction price allocated to remaining performance obligations [line items]
Telecommunications services (mobile and fixed)	SFr 7.1

REVENUE FROM CONTRACTS WITH C_7

REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Liabilities (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total	SFr 74.8	SFr 79.8	SFr 75
Thereof current portion of contract liabilities	71.3	66.7	69.9
Thereof non-current portion of contract liabilities	3.5	13.1	5.1
Residential customers
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total	46	43.1	55.3
Business customers & Wholesale
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total	28	36.3	19.2
Infrastructure & Support functions
Disclosure of disaggregation of revenue from contracts with customers [line items]
Total	SFr 0.8	SFr 0.4	SFr 0.5

REVENUE FROM CONTRACTS WITH C_8

REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Costs (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Revenue From Contracts With Customers [Abstract]
Balance as of January 1	SFr 69.3	SFr 62.5
Additional capitalised contract cost	88.1	71.6
Amortized contract cost	(77)	(64.8)
Balance as of December 31	SFr 80.4	SFr 69.3

OTHER OPERATING INCOME AND EX_3

OTHER OPERATING INCOME AND EXPENSES (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Analysis of income and expense [abstract]
Marketing & Commissions	SFr (188.8)	SFr (195.2)	SFr (195.9)
Network related costs	(170.6)	(167.4)	(207.6)
Professional Services	(105.7)	(130.2)	(130.1)
Facility & Energy	(66.5)	(55.1)	(51)
IT expenses	(57.6)	(49.4)	(50.9)
Administration	(34.7)	(39.4)	(43)
Call centre services	(34.7)	(39.2)	(39.6)
Allowance for receivables	(35.3)	(16.9)	(27.6)
Other	(2.5)	(66.1)	(4.4)
Total other operating expenses	(696.4)	(758.8)	(750.2)
Capitalized labor as non-current assets	63	68.3	60.1
Other income	5.1	37.4	1.5
Other operating income and capitalized labor	SFr 68.1	SFr 105.7	SFr 61.7

OTHER OPERATING INCOME AND EX_4

OTHER OPERATING INCOME AND EXPENSES - Narrative (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of attribution of expenses by nature to their function [line items]
Increase (decrease) in professional fees expense	SFr 24.5
Increase (decrease) in fuel and energy expense	11.4
Increase (decrease) in allowance for receivables expense	18.4
Other	2.5	SFr 66.1	SFr 4.4
Other operating income and capitalized labor	68.1	105.7	SFr 61.7
Disputed Over-Charges
Disclosure of attribution of expenses by nature to their function [line items]
Other operating income and capitalized labor		17.2
Abandoned Lease Income
Disclosure of attribution of expenses by nature to their function [line items]
Other operating income and capitalized labor		20
Broadcasting Rights Penalty
Disclosure of attribution of expenses by nature to their function [line items]
Other		29.1
Restructuring obligations
Disclosure of attribution of expenses by nature to their function [line items]
Other		SFr 28.5
Intercompany-Related
Disclosure of attribution of expenses by nature to their function [line items]
Increase (decrease) in professional fees expense	14.4
Contracting Services
Disclosure of attribution of expenses by nature to their function [line items]
Increase (decrease) in professional fees expense	SFr 13

PERSONNEL EXPENSES (Details)

PERSONNEL EXPENSES (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Personnel Expenses [Abstract]
Wages, salaries and social security charges	SFr 363.9	SFr 384.2	SFr 380.8
Pension expenses	24	10	26.8
Share-based compensation	19.1	22.5	30.7
Personnel expenses	SFr 407	SFr 416.7	SFr 438.3

KEY MANAGEMENT PERSONNEL COMP_3

KEY MANAGEMENT PERSONNEL COMPENSATION (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Key Managment Personnel Compensation [Abstract]
Wages, salaries and social security charges	SFr 8.4	SFr 6.2	SFr 8
Pension costs	0.8	0.8	1.2
Share-based compensation	6.6	6.9	9.1
Termination benefits	0.7	2.5	0.7
Total	SFr 16.5	SFr 16.4	SFr 19

EMPLOYEE BENEFIT OBLIGAITONS -

EMPLOYEE BENEFIT OBLIGAITONS - Additional Information (Details)	12 Months Ended
	Dec. 31, 2024 CHF (SFr)	Dec. 31, 2023 CHF (SFr)	Dec. 31, 2022 CHF (SFr)	Sep. 30, 2024 participant	Sep. 30, 2023 participant
Disclosure of net defined benefit liability (asset) [line items]
Curtailment gain	SFr 0	SFr 13,500,000	SFr 0
Weighted average duration of defined benefit obligation	12 years 7 months 6 days	11 years 10 months 24 days
Estimate of contributions expected to be paid to plan for next annual reporting period	SFr 22,500,000
Defined contribution plan, active participants | participant				2,799	2,882
Salary requirement for defined contribution plan	136,080
Defined contribution plan, participants receiving benefits | participant				411	409
Post-employment benefit expense, defined contribution plans	SFr 6,600,000	SFr 6,600,000
Minimum
Disclosure of net defined benefit liability (asset) [line items]
Strategic asset mix, equity securities	21%
Strategic asset mix, bonds	20%
Strategic asset mix, real estate	12%
Strategic asset mix, cash in banks	0%
Strategic asset mix, other	0%
Maximum
Disclosure of net defined benefit liability (asset) [line items]
Strategic asset mix, equity securities	47%
Strategic asset mix, bonds	56%
Strategic asset mix, real estate	38%
Strategic asset mix, cash in banks	4%
Strategic asset mix, other	7%

EMPLOYEE BENEFIT OBLIGAITONS _2

EMPLOYEE BENEFIT OBLIGAITONS - Pension Costs Resulting From Defined Benefit Plans (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee Benefit Obligations [Abstract]
Current service costs excluding interest costs	SFr 19.5	SFr 16.9	SFr 20.7
Net interest costs on defined benefit obligation and service costs	0.4	0.3	0.1
Past service income	(2.1)	(13.5)	(0.3)
Administration costs	1.7	0.6	0.9
Termination benefits	0.2	0.2	0.2
Total	SFr 19.7	SFr 4.5	SFr 21.6

EMPLOYEE BENEFIT OBLIGAITONS _3

EMPLOYEE BENEFIT OBLIGAITONS - Assets and Obligations (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Employee Benefit Obligations [Abstract]
Fair value of plan assets	SFr 851.4	SFr 793.7
Defined benefit obligation	(859.8)	(802.1)
Total	SFr (8.4)	SFr (8.4)

EMPLOYEE BENEFIT OBLIGAITONS _4

EMPLOYEE BENEFIT OBLIGAITONS - Movement in Other Comprehensive Income (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Actuarial (gain) / loss due to
demographic assumptions	SFr 0	SFr (0.1)	SFr (0.6)
financial assumptions	15.5	81	(163.9)
experience adjustments	39.9	5.6	11.8
Actuarial (gain) / loss during period	55.4	86.5	(152.6)
Return on defined benefit plan assets (greater)/less than net interest recognised	(48.4)	(18.8)	108.4
Impact of changes in asset ceiling	0	(37.3)	33.2
Remeasurement effects recognized in OCI	SFr 7	SFr 30.4	SFr (11)

EMPLOYEE BENEFIT OBLIGAITONS _5

EMPLOYEE BENEFIT OBLIGAITONS - Movement in Defined Benefit Obligations (Details) - Defined benefit obligation - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]
Net defined benefit liability (asset) at beginning of period	SFr 802.1	SFr 748.8
Included in the consolidated statements of income or loss
Current service costs excluding interest costs	19.5	16.9
Past service income	(2.1)	(13.5)
Net interest costs on defined benefit obligation and service costs	10.5	16.4
Administration costs	1.9	0.8
Settlements	0	(6.2)
Included in consolidated statements of other comprehensive income
Demographic assumptions	0	(0.1)
Financial assumptions	15.5	81
Experience adjustment	39.9	5.6
Other
Employee contributions	20.1	20.4
Benefits paid / transferred	(47.5)	(68)
Net defined benefit liability (asset) at end of period	SFr 859.9	SFr 802.1

EMPLOYEE BENEFIT OBLIGAITONS _6

EMPLOYEE BENEFIT OBLIGAITONS - Movement in Fair Value of Plan Assets (Details) - Fair value of plan assets - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]
Balance as of January 1	SFr 793.7	SFr 784.3
Included in the consolidated statements of income or loss
Interest income	10.1	16.8
Settlements	0	(6.2)
Included in consolidated statements of other comprehensive income
Return on plan assets excluding interest income or expense, net of tax, defined benefit plans	48.4	18.8
Other
Employer contributions	26.6	27.5
Employee contributions	20.1	20.5
Benefits paid / transferred	(47.5)	(68)
Total fair value of plan assets as of December 31	SFr 851.4	SFr 793.7

EMPLOYEE BENEFIT OBLIGAITONS _7

EMPLOYEE BENEFIT OBLIGAITONS - Asset Allocation of Plan Assets (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Classes of plan assets, fair value monetary amounts [abstract]
Cash and cash equivalents	SFr 12.1	SFr 8.8
Equity securities	301.6	267.2
Debt securities	305.8	299.5
Real estate	168.5	159.4
Other	63.4	58.8
Fair value of plan assets	SFr 851.4	SFr 793.7
Quoted
Classes of plan assets, fair value percentage amounts [abstract]
Cash and cash equivalents	0%	0%
Equity securities	35.40%	33.70%
Debt securities	35.90%	37.70%
Real estate	1.50%	2.80%
Other	0%	0%
Total	72.80%	74.30%
Unquoted
Classes of plan assets, fair value percentage amounts [abstract]
Cash and cash equivalents	1.40%	1.10%
Equity securities	0%	0%
Debt securities	0%	0%
Real estate	18.30%	17.20%
Other	7.40%	7.40%
Total	27.20%	25.70%

EMPLOYEE BENEFIT OBLIGAITONS _8

EMPLOYEE BENEFIT OBLIGAITONS - Principal Actuarial Assumptions (Details)	Dec. 31, 2024	Dec. 31, 2023
Employee Benefit Obligations [Abstract]
Discount rate	0.95%	1.35%
Interest crediting rate	1.25%	2.30%
Future salary increases	1.60%	1.70%

EMPLOYEE BENEFIT OBLIGAITONS _9

EMPLOYEE BENEFIT OBLIGAITONS - Sensitivity Analysis (Details) SFr in Millions	Dec. 31, 2024 CHF (SFr)
Discount rate (0.5% movement)
Disclosure of net defined benefit liability (asset) [line items]
Percentage of reasonably possible increase in actuarial assumption	0.50%
Percentage of reasonably possible decrease in actuarial assumption	0.50%
Reasonably possible increase in actuarial assumption	SFr 809.9
Reasonably possible decrease in actuarial assumption	SFr 916.2
Future salary increases (1.0% movement)
Disclosure of net defined benefit liability (asset) [line items]
Percentage of reasonably possible increase in actuarial assumption	1%
Percentage of reasonably possible decrease in actuarial assumption	1%
Reasonably possible increase in actuarial assumption	SFr 871.7
Reasonably possible decrease in actuarial assumption	SFr 849.9

SHARE-BASED COMPENSATION - Addi

SHARE-BASED COMPENSATION - Additional Information (Details) - PSUs	12 Months Ended
	Dec. 31, 2024 shares installment SFr / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of vesting installments | installment	1
Share price volatility	24.70%
Entry price (in chf per share) | SFr / shares	SFr 40.61
Risk-free rate	1.01%
Minimum | Cumulative Absolute Adjusted Free Cash Flow
Disclosure of terms and conditions of share-based payment arrangement [line items]
Performance condition, shares entitled to	0
Minimum | Total Shareholder Return
Disclosure of terms and conditions of share-based payment arrangement [line items]
Performance condition, shares entitled to	1.5
Maximum | Cumulative Absolute Adjusted Free Cash Flow
Disclosure of terms and conditions of share-based payment arrangement [line items]
Performance condition, shares entitled to	1.85
Maximum | Total Shareholder Return
Disclosure of terms and conditions of share-based payment arrangement [line items]
Performance condition, shares entitled to	0

SHARE-BASED COMPENSATION - Summ

SHARE-BASED COMPENSATION - Summary of Share-Based Compensation Costs (Details) SFr in Millions	12 Months Ended
	Dec. 31, 2024 CHF (SFr)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation costs	SFr 19.1
Non-performance based incentive awards
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation costs	4.9
Performance-based incentive awards
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation costs	1.2
Shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation costs	0.8
SHIP
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation costs	2.3
Other
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation costs	SFr 9.9

SHARE-BASED COMPENSATION - Fair

SHARE-BASED COMPENSATION - Fair Value of Awards at Grant Date (Details) - CHF (SFr)	Dec. 30, 2024	Dec. 06, 2024	Aug. 02, 2024	Mar. 25, 2024
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value at grant date (in chf per share)		SFr 41.55
RSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value at grant date (in chf per share)	SFr 39.32	41.55	SFr 36.59	SFr 34.07
SARs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value at grant date (in chf per share)			10.45	9.66
PSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value at grant date (in chf per share)	SFr 42.09	SFr 42.09	SFr 44.65	SFr 50.01

SHARE-BASED COMPENSATION - Su_2

SHARE-BASED COMPENSATION - Summary of Award Activity (Details)	12 Months Ended
	Dec. 31, 2024
Disclosure of terms and conditions of share-based payment arrangement [line items]
Beginning balance (in shares)	0
Granted (in shares)	1,400,785
Settled (in shares)	(99,186)
Forfeited (in shares)	(19,348)
Ending balance (in shares)	1,282,251
PSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Beginning balance (in shares)	0
Granted (in shares)	421,608
Settled (in shares)	0
Forfeited (in shares)	0
Ending balance (in shares)	421,608
RSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Beginning balance (in shares)	0
Granted (in shares)	408,262
Settled (in shares)	0
Forfeited (in shares)	(8,863)
Ending balance (in shares)	399,399
SARs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Beginning balance (in shares)	0
Granted (in shares)	471,729
Settled (in shares)	0
Forfeited (in shares)	(10,485)
Ending balance (in shares)	461,244
Shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Beginning balance (in shares)	0
Granted (in shares)	99,186
Settled (in shares)	(99,186)
Forfeited (in shares)	0
Ending balance (in shares)	0

SHARE-BASED COMPENSATION - Su_3

SHARE-BASED COMPENSATION - Summary of Weighted-Average Strike Price (Details)	12 Months Ended
	Dec. 31, 2024 SFr / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Beginning balance (in shares)	0
Granted (in shares)	1,400,785
Forfeited (in shares)	(19,348)
Ending balance (in shares)	1,282,251
SARs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Beginning balance (in shares)	0
Granted (in shares)	471,729
Forfeited (in shares)	(10,485)
Ending balance (in shares)	461,244
Weighted average strike price, beginning balance period (in chf per share)	SFr 0
Weighted average strike price, granted (in chf per share)	33.88
Weighted average strike price, forfeited (in chf per share)	33.57
Weighted average strike price, ending balance (in chf per share)	SFr 33.88

OTHER OPERATING ASSETS AND LI_3

OTHER OPERATING ASSETS AND LIABILITIES - Summary (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other assets - current:
Third party receivables	SFr 63.4	SFr 120
Prepayments	60.8	128.7
Contract assets	14.6	17.3
Contract costs	61.1	53.6
Inventories	58.5	50.1
Other	1.5	6.3
Total	259.9	376
Other assets - non-current:
Non-current trade receivables gross	34.3	44
Prepayments	82.1	31.7
Contract assets	13.2	14.4
Contract costs	19.2	15.8
Other	11.6	10.5
Total	160.4	116.4
Other liabilities - current:
Accrued other liabilities	261	335
Accrued capital expenditures	63.5	66.9
Accrued payroll and employee benefits	68.3	83
Deferred revenue	71.3	66.7	SFr 69.9
Other	32.9	31.2
Total	497	582.8
Other liabilities - non-current:
Other	48.2	89.8
Total	SFr 48.2	SFr 89.8

OTHER OPERATING ASSETS AND LI_4

OTHER OPERATING ASSETS AND LIABILITIES - Narrative (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Other Operating Assets And Liabilities [Abstract]
Write-downs of inventories to the net realizable value	SFr 0.7	SFr 8.9
Value of inventories recognised as expense during period	SFr 226.1	SFr 217.8

LEASING - Right of Use Assets (

LEASING - Right of Use Assets (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of quantitative information about right-of-use assets [line items]
Right-of-use assets	SFr 1,262.5	SFr 1,294.2
Distribution systems
Disclosure of quantitative information about right-of-use assets [line items]
Right-of-use assets	1,091.4	1,166.2
Support equipment, buildings and land
Disclosure of quantitative information about right-of-use assets [line items]
Right-of-use assets	SFr 171.1	SFr 128

LEASING - Narrative (Details)

LEASING - Narrative (Details) SFr in Thousands	12 Months Ended
	Dec. 31, 2024 CHF (SFr)	Dec. 31, 2023 CHF (SFr)
Disclosure Of Leases [Abstract]
Weighted average discount rate	0.055	0.050
Additions to right-of-use assets	SFr 126,300	SFr 56,200

LEASING - Lease Expenses (Detai

LEASING - Lease Expenses (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of quantitative information about right-of-use assets [line items]
Total depreciation and amortization	SFr 129.7	SFr 128	SFr 145.4
Interest expense	69.8	67.9	65.3
Short-term lease expense	2.4	3.2	3.2
Total lease expense	201.9	199.1	213.9
Distribution systems
Disclosure of quantitative information about right-of-use assets [line items]
Total depreciation and amortization	101.4	99.3	96.3
Support equipment, buildings and land
Disclosure of quantitative information about right-of-use assets [line items]
Total depreciation and amortization	SFr 28.3	SFr 28.7	SFr 49.1

LEASING - Summary of Lease Liab

LEASING - Summary of Lease Liability Maturity (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of maturity analysis of operating lease payments [line items]
Total payments	SFr 1,667.1	SFr 1,748.9
Less: present value discount	(447.8)	(491.2)
Present value of lease payments	1,219.3	1,257.7
Current portion	164.1	170.4
Non-current portion	1,055.2	1,087.3
Within 1 year
Disclosure of maturity analysis of operating lease payments [line items]
Total payments	164.1	170.4
Between 1 and 2 years
Disclosure of maturity analysis of operating lease payments [line items]
Total payments	152	153.9
Between 2 and 3 years
Disclosure of maturity analysis of operating lease payments [line items]
Total payments	148.8	145.5
Between 3 and 4 years
Disclosure of maturity analysis of operating lease payments [line items]
Total payments	141.3	141.9
Between 4 and 5 years
Disclosure of maturity analysis of operating lease payments [line items]
Total payments	135.2	135
After 5 years
Disclosure of maturity analysis of operating lease payments [line items]
Total payments	SFr 925.7	SFr 1,002.2

LEASING - Cash Flows (Details)

LEASING - Cash Flows (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Leases [Abstract]
Principal payments	SFr 114.4	SFr 107.6
Interest payments	61	58.4
Payments for short-term leases	2.4	3.2
Cash outflow for leases	SFr 177.8	SFr 169.2

PROPERTY, PLANT AND EQUIPMENT -

PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	SFr 2,295.7
Property, plant and equipment at period end	2,338.5	SFr 2,295.7
Distribution systems
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	681.7
Property, plant and equipment at period end	427.8	681.7
Customer premises equipment
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	208.3
Property, plant and equipment at period end	232.8	208.3
Support equipment and buildings
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	1,058.2
Property, plant and equipment at period end	1,158.1	1,058.2
Assets under construction
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	347.5
Property, plant and equipment at period end	519.7	347.5
Software
Reconciliation of changes in property, plant and equipment [abstract]
Reclassifications	(10.9)
Cost
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	5,484.5	5,163.9
Additions	408	377.2
Additions from business combinations		73.7
Retirements and disposals	(339.4)	(130.3)
Reclassifications	(76.4)	0
Other	(1)
Property, plant and equipment at period end	5,475.7	5,484.5
Cost | Distribution systems
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	3,311	3,060.6
Additions	257.3	280.5
Additions from business combinations		70.7
Retirements and disposals	(213.1)	(34.9)
Reclassifications	(233.9)	(65.9)
Other	0
Property, plant and equipment at period end	3,121.3	3,311
Cost | Customer premises equipment
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	373	432.3
Additions	100.3	93.2
Additions from business combinations		0
Retirements and disposals	(101)	(93.3)
Reclassifications	(9.6)	(59.2)
Other	0
Property, plant and equipment at period end	362.7	373
Cost | Support equipment and buildings
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	1,452.9	1,423.3
Additions	50.4	3.5
Additions from business combinations		3
Retirements and disposals	(25.3)	(2.1)
Reclassifications	(6.1)	25.2
Other	0
Property, plant and equipment at period end	1,471.9	1,452.9
Cost | Assets under construction
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	347.5	247.7
Additions	0	0
Additions from business combinations		0
Retirements and disposals	0	0
Reclassifications	173.2	99.9
Other	(1)
Property, plant and equipment at period end	519.7	347.5
Accumulated depreciation and impairment
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	(3,188.7)	(2,866.8)
Depreciation	(368)	(452.5)
Retirements and disposals	339	130.6
Reclassifications	65.5	0
Other	15
Property, plant and equipment at period end	(3,137.2)	(3,188.7)
Accumulated depreciation and impairment | Distribution systems
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	(2,629.3)	(2,326.1)
Depreciation	(287.1)	(290.8)
Retirements and disposals	213.1	34.9
Reclassifications	0	(47.3)
Other	9.8
Property, plant and equipment at period end	(2,693.5)	(2,629.3)
Accumulated depreciation and impairment | Customer premises equipment
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	(164.7)	(249)
Depreciation	(67.9)	(69.1)
Retirements and disposals	100.7	93.3
Reclassifications	0	60.1
Other	2
Property, plant and equipment at period end	(129.9)	(164.7)
Accumulated depreciation and impairment | Support equipment and buildings
Reconciliation of changes in property, plant and equipment [abstract]
Property, plant and equipment at period start	(394.7)	(291.7)
Depreciation	(13)	(92.6)
Retirements and disposals	25.2	2.4
Reclassifications	65.5	(12.8)
Other	3.2
Property, plant and equipment at period end	SFr (313.8)	SFr (394.7)

PROPERTY, PLANT AND EQUIPMENT_2

PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) SFr in Millions	12 Months Ended
	Dec. 31, 2024 CHF (SFr)
Software
Disclosure of detailed information about property, plant and equipment [line items]
Reclassifications	SFr (10.9)

INTANGIBLE ASSETS (Details)

INTANGIBLE ASSETS (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	SFr 1,529.9
Intangible assets other than goodwill at end of period	1,084.4	SFr 1,529.9
Brands and customers relationships
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	928.9
Intangible assets other than goodwill at end of period	609.1	928.9
Licenses and rights
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	332.6
Intangible assets other than goodwill at end of period	265.6	332.6
Software
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	259.9
Reclassifications	10.9
Intangible assets other than goodwill at end of period	201.8	259.9
Other intangible assets
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	8.5
Intangible assets other than goodwill at end of period	7.9	8.5
Principal amount
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	3,260.3	3,165.7
Additions from business combinations		8.4
Additions	101.9	160.5
Retirements and disposals	(194.1)	(75.7)
Reclassifications	76.4
Other	5.5	1.4
Intangible assets other than goodwill at end of period	3,250	3,260.3
Principal amount | Brands and customers relationships
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	1,955.8	1,972
Additions from business combinations		8.4
Additions	0	0.3
Retirements and disposals	0	(27.4)
Reclassifications	0
Other	1.9	2.5
Intangible assets other than goodwill at end of period	1,957.7	1,955.8
Principal amount | Licenses and rights
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	652.1	652.1
Additions from business combinations		0
Additions	2	0
Retirements and disposals	(153.5)	0
Reclassifications	0
Other	0	0
Intangible assets other than goodwill at end of period	500.6	652.1
Principal amount | Software
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	635.2	523.3
Additions from business combinations		0
Additions	99.9	160.2
Retirements and disposals	(32.6)	(48.3)
Reclassifications	76.4
Other	0	0
Intangible assets other than goodwill at end of period	778.9	635.2
Principal amount | Other intangible assets
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	17.2	18.3
Additions from business combinations		0
Additions	0	0
Retirements and disposals	(8)	0
Reclassifications	0
Other	3.6	(1.1)
Intangible assets other than goodwill at end of period	12.8	17.2
Accumulated depreciation and impairment
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	(1,730.4)	(1,266.6)
Retirements and disposals	194.1	75.7
Reclassifications	(65.5)
Other	(13.9)	0.1
Amortization	(549.9)	(539.6)
Intangible assets other than goodwill at end of period	(2,165.6)	(1,730.4)
Accumulated depreciation and impairment | Brands and customers relationships
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	(1,026.9)	(732.3)
Retirements and disposals	0	27.4
Reclassifications	0
Other	0	0
Amortization	(321.7)	(322)
Intangible assets other than goodwill at end of period	(1,348.6)	(1,026.9)
Accumulated depreciation and impairment | Licenses and rights
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	(319.5)	(252.7)
Retirements and disposals	153.5	0
Reclassifications	0
Other	0	0
Amortization	(69)	(66.8)
Intangible assets other than goodwill at end of period	(235)	(319.5)
Accumulated depreciation and impairment | Software
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	(375.3)	(280)
Retirements and disposals	32.6	48.3
Reclassifications	(65.5)
Other	(13.9)	0
Amortization	(155)	(143.6)
Intangible assets other than goodwill at end of period	(577.1)	(375.3)
Accumulated depreciation and impairment | Other intangible assets
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill at beginning of period	(8.7)	(1.6)
Retirements and disposals	8	0
Reclassifications	0
Other	0	0.1
Amortization	(4.2)	(7.2)
Intangible assets other than goodwill at end of period	SFr (4.9)	SFr (8.7)

INTANGIBLE ASSETS - Narrative (

INTANGIBLE ASSETS - Narrative (Details) SFr in Millions	12 Months Ended
	Dec. 31, 2024 CHF (SFr) license	Dec. 31, 2023 CHF (SFr)	Dec. 31, 2022 CHF (SFr)
Disclosure of detailed information about intangible assets [line items]
Intangible assets	SFr 1,084.4	SFr 1,529.9
Number of licensees owned | license	2
License and Rights, Usages of 4G
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	4 years
License and Rights, Usages of 5G
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	10 years
License and Rights, Broadcasting Rights
Disclosure of detailed information about intangible assets [line items]
Useful life measured as period of time, intangible assets other than goodwill	3 years
Software
Disclosure of detailed information about intangible assets [line items]
Intangible assets	SFr 201.8	259.9
Useful life measured as period of time, intangible assets other than goodwill	5 years
Reclassifications	SFr 10.9
Principal amount
Disclosure of detailed information about intangible assets [line items]
Intangible assets	3,250	3,260.3	SFr 3,165.7
Reclassifications	76.4
Principal amount | Customer-related intangible assets
Disclosure of detailed information about intangible assets [line items]
Intangible assets	SFr 575.7
Useful life measured as period of time, intangible assets other than goodwill	2 years
Principal amount | Brand names
Disclosure of detailed information about intangible assets [line items]
Intangible assets	SFr 20.5
Useful life measured as period of time, intangible assets other than goodwill	6 years
Principal amount | License and Rights, Usages of 4G
Disclosure of detailed information about intangible assets [line items]
Intangible assets	SFr 120.6
Principal amount | License and Rights, Usages of 5G
Disclosure of detailed information about intangible assets [line items]
Intangible assets	56.8
Principal amount | License and Rights, Broadcasting Rights
Disclosure of detailed information about intangible assets [line items]
Intangible assets			80
Principal amount | Software
Disclosure of detailed information about intangible assets [line items]
Intangible assets	778.9	SFr 635.2	SFr 523.3
Reclassifications	SFr 76.4

GOODWILL - (Details)

GOODWILL - (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	SFr 6,012.7	SFr 6,006.3
Additions from business combinations	0	6.4
Goodwill at end of period	6,012.7	6,012.7
Residential
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	4,587.1	4,580.7
Additions from business combinations	0	6.4
Goodwill at end of period	4,587.1	4,587.1
Business
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	1,098.3	1,098.3
Additions from business combinations	0	0
Goodwill at end of period	1,098.3	1,098.3
Wholesale
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	327.3	327.3
Additions from business combinations	0	0
Goodwill at end of period	SFr 327.3	SFr 327.3

GOODWILL - Key Assumptions (Det

GOODWILL - Key Assumptions (Details)	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Abstract]
Long-term growth rate	0%	0.60%
WACC (pre-tax)	5.30%	7%

GOODWILL - Narrative (Details)

GOODWILL - Narrative (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Intangible assets with indefinite useful life	SFr 0	SFr 0
Business plan, term	5 years
Weighted average cost of capital | Discounted cash flow
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Percentage of reasonably possible increase in unobservable input, assets	1%
Revenue | Discounted cash flow
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Percentage of reasonably possible decrease in unobservable input, assets	5%
EBITDA Margin | Discounted cash flow
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]
Percentage of reasonably possible decrease in unobservable input, assets	5%

PROVISIONS (Details)

PROVISIONS (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of changes in other provisions [abstract]
Other provisions at beginning of period	SFr 116.9	SFr 71.8
Provisions made during the period	4	60.4
Change in present value	2.4	2.5
Provisions used during the period	(54.6)	(17.8)
Other provisions at end of period	68.7	116.9
Thereof current	4.7	52.8
Thereof non-current	SFr 64	64.1
Provisions, expected term	12 months
Asset retirement obligations
Reconciliation of changes in other provisions [abstract]
Other provisions at beginning of period	SFr 64.1	61.4
Provisions made during the period	2.1	2
Change in present value	2.4	2.5
Provisions used during the period	(4.6)	(1.8)
Other provisions at end of period	64	64.1
Thereof current	0	0
Thereof non-current	64	64.1
Restructuring obligations
Reconciliation of changes in other provisions [abstract]
Other provisions at beginning of period	22.9	10.4
Provisions made during the period	1.9	28.5
Change in present value	0	0
Provisions used during the period	(20.1)	(16)
Other provisions at end of period	4.7	22.9
Thereof current	4.7	22.9
Thereof non-current	0	0
Other provisions
Reconciliation of changes in other provisions [abstract]
Other provisions at beginning of period	29.9	0
Provisions made during the period	0	29.9
Change in present value	0	0
Provisions used during the period	(29.9)	0
Other provisions at end of period	0	29.9
Thereof current	0	29.9
Thereof non-current	SFr 0	SFr 0

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - CHF (SFr) SFr in Millions		3 Months Ended	12 Months Ended
	Aug. 25, 2023	Sep. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Nov. 30, 2023	Dec. 08, 2017
Disclosure of detailed information about commitments and contingencies [Line Items]
Total contractual and purchase commitments			SFr 886.7	SFr 939.3
Mobile Network Services Claims
Disclosure of detailed information about commitments and contingencies [Line Items]
Estimated financial effect of contingent liabilities						SFr 90
Broadcasting Rights Penalty
Disclosure of detailed information about commitments and contingencies [Line Items]
Estimated financial effect of contingent liabilities					SFr 29.1
Broadcasting rights penalty, amount of claims settled			SFr 29.3
Dispute with Swisscome
Disclosure of detailed information about commitments and contingencies [Line Items]
Proceeds from dispute, non-prejudicial amount received	SFr 18.8
Gain contingencies, recognized amount		SFr 17.2

INCOME TAXES - Disclosure of In

INCOME TAXES - Disclosure of Income Tax Expense (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Abstract]
Current income tax expense	SFr (20.6)	SFr (17.3)	SFr (6.5)
Current income tax benefit (expense) of prior periods	(19.2)	1	0.2
Deferred income tax benefit	56.5	76.2	57
Income tax benefit (expense)	SFr 16.7	SFr 59.9	SFr 50.7

INCOME TAXES - Reconciliation O

INCOME TAXES - Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates And Average Effective Tax Rate (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Abstract]
Income (loss) before income taxes	SFr (378.5)	SFr (372.1)	SFr 33.3
Domestic income tax rate	18.30%	18.40%	18.40%
Expected income tax income/(expense)	SFr 69.4	SFr 68.4	SFr (6.1)
Effect of income taxed at differing tax rates	5	(3.7)	(39.8)
Non-deductible items	(18.4)	(9.9)	(1)
Non-taxable income	0	0.1	0.9
Effect of changes in recognition of deferred tax assets	(0.6)	3.2	92.3
Adjustments to deferred tax balances arising from tax rate changes	0	0.5	3.3
Adjustments recognized for current and deferred tax of prior periods	(40.3)	1	0.3
Other effects	1.6	0.3	0.8
Income tax benefit (expense)	SFr 16.7	SFr 59.9	SFr 50.7

INCOME TAXES - Deferred Tax Ass

INCOME TAXES - Deferred Tax Assets And Liabilities By Origin Of The Temporary Difference (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liabilities	SFr 199.9	SFr 463.3
Deferred tax assets	57.8	256.6
Netting of deferred tax assets	34.2	256.6
Netting of deferred tax liabilities	(34.1)	(256.6)
Reflected in the consolidated statements of financial position as follows:
Deferred tax assets	23.6	0
Deferred tax liabilities	165.8	206.7
Intangible assets
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liabilities	135.2
Reflected in the consolidated statements of financial position as follows:
Deferred tax liabilities		195.7
Property, plant and equipment
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liabilities	34.2
Reflected in the consolidated statements of financial position as follows:
Deferred tax liabilities		43.5
Unrealized foreign exchange results
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	26.5
Reflected in the consolidated statements of financial position as follows:
Deferred tax liabilities		206.9
Derivatives
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liabilities	4.8
Reflected in the consolidated statements of financial position as follows:
Deferred tax liabilities		0.1
Receivables
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liabilities	3.9
Reflected in the consolidated statements of financial position as follows:
Deferred tax assets		0.1
Right-of-use assets
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	20.4
Reflected in the consolidated statements of financial position as follows:
Deferred tax assets		19.3
Deferred revenue
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liabilities	20.1
Deferred tax assets	0.1
Reflected in the consolidated statements of financial position as follows:
Deferred tax assets		0.1
Deferred tax liabilities		12.7
Employee benefit obligations
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	1.4
Reflected in the consolidated statements of financial position as follows:
Deferred tax assets		1.4
Provisions
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liabilities	0.3
Deferred tax assets	8.9
Reflected in the consolidated statements of financial position as follows:
Deferred tax assets		3.3
Deferred tax liabilities		3.7
Lease liabilities
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liabilities	1
Reflected in the consolidated statements of financial position as follows:
Deferred tax liabilities		0.3
Other
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax liabilities	0.4
Deferred tax assets	0.1
Reflected in the consolidated statements of financial position as follows:
Deferred tax liabilities		0.4
Tax net operating loss carry forward
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	SFr 0.4
Reflected in the consolidated statements of financial position as follows:
Deferred tax assets		SFr 232.4

INCOME TAXES - Net Change In De

INCOME TAXES - Net Change In Deferred Tax Assets And Liabilities (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Abstract]
Opening balance at the beginning of the period January 1	SFr 206.7	SFr 294.7	SFr 351
Changes recognized in the consolidated statements of income or loss	(56.6)	(76.2)	(57)
Changes recognized in the consolidated statements of comprehensive income or loss	(1.2)	(5.4)	1.8
Changes recognized in the consolidated statements of changes in equity	(7.9)	(8.9)	(1.1)
Change in scope of consolidation / goodwill adjustment	0	3.7
Foreign currency effects	1.2	(1.2)
Closing balance at the end of the period December 31	SFr 142.2	SFr 206.7	SFr 294.7

INCOME TAXES - Disclosure Of Un

INCOME TAXES - Disclosure Of Unused tax losses For Which No Deferred Tax Asset Recognised (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carryforwards for which no deferred tax assets are recognized	SFr 16.5	SFr 109.4
Due to expire within 1 year
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carryforwards for which no deferred tax assets are recognized	0	0
Due to expire within 2 to 7 years
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carryforwards for which no deferred tax assets are recognized	16.5	0
Due to expire in more than 7 years
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carryforwards for which no deferred tax assets are recognized	0	0
Amount not due to expire
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carryforwards for which no deferred tax assets are recognized	SFr 0	SFr 109.4

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carryforwards for which no deferred tax assets are recognized	SFr 16.5	SFr 109.4
Deductible temporary differences for which no deferred tax asset is recognised	0	967.4
Amount not due to expire
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax loss carryforwards for which no deferred tax assets are recognized	SFr 0	SFr 109.4

EQUITY (Details)

EQUITY (Details) - CHF (SFr) SFr / shares in Units, SFr in Millions	8 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	May 03, 2024
Disclosure of classes of share capital [line items]
Number of treasury shares purchased (in shares)		1,000,000
Purchase of treasury shares		SFr 0.1
Number of shares repurchased for share-based payment arrangement (in shares)		99,186
Capital contributions (distributions)		SFr 1,177.7	SFr (64.2)	SFr 920.6
UPC Holding 3.875% Senior Notes
Disclosure of classes of share capital [line items]
Interest rate				3.875%
UPC Holding 5.5% Senior Notes
Disclosure of classes of share capital [line items]
Interest rate				5.50%
Other Reserves
Disclosure of classes of share capital [line items]
Other reserves, increase (decrease) through change in service agreement			(50.9)
Other reserves, increase (decrease) through income tax effects allocated directly to equity			SFr 6.1
Other Reserves | Liberty Global Europe Holding BV
Disclosure of classes of share capital [line items]
Capital contributions (distributions)		1,106.2		SFr 955.8
Other reserves, increase (decrease) through income tax effects allocated directly to equity		SFr 25.1
Class A Common Shares
Disclosure of classes of share capital [line items]
Number of shares authorised (in shares)	69,759,702	69,759,702
Par value per share (in CHF per share)	SFr 0.10	SFr 0.10
Number of shares issued (in shares)	68,858,888	68,858,888	194
Number of shares outstanding (in shares)	68,858,888	68,858,888	194		69,759,702
Number of treasury shares purchased (in shares)	1,000,000
Number of shares repurchased for share-based payment arrangement (in shares)	99,186
Class B Common Shares
Disclosure of classes of share capital [line items]
Number of shares authorised (in shares)	25,977,316	25,977,316
Par value per share (in CHF per share)	SFr 0.01	SFr 0.01
Number of shares outstanding (in shares)	25,977,316	25,977,316			25,977,316
Number of treasury shares purchased (in shares)	0
Number of shares repurchased for share-based payment arrangement (in shares)	0

EARNINGS PER SHARE - Schedule o

EARNINGS PER SHARE - Schedule of Earnings per Share (Details) - CHF (SFr) SFr / shares in Units, SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Class A Common Shares
Earnings per share [line items]
Allocation of net income (loss) attributable to Sunrise share classes (in CHF million)	SFr (352.7)	SFr (304.8)	SFr 77.6
Allocation of net income (loss) attributable to Sunrise share classes (in CHF million)	SFr (352.7)	SFr (304.8)	SFr 77.6
Weighted average number of shares outstanding, basic (in shares)	69,619,207	69,759,702	69,759,702
Weighted average number of shares outstanding, diluted (in shares)	69,619,207	69,759,702	69,759,702
Adjusted weighted average of shares outstanding, basic (in shares)	69,619,207	69,759,702	69,759,702
Adjusted weighted average of shares outstanding, diluted (in shares)	69,619,207	69,759,702	69,759,702
Diluted earnings (loss) per share (in SFr per share)	SFr (5.1)	SFr (4.4)	SFr 1.1
Basic earnings (loss) per share (in SFr per share)	SFr (5.1)	SFr (4.4)	SFr 1.1
Class B Common Shares
Earnings per share [line items]
Allocation of net income (loss) attributable to Sunrise share classes (in CHF million)	SFr (13.1)	SFr (11.3)	SFr 2.9
Allocation of net income (loss) attributable to Sunrise share classes (in CHF million)	SFr (13.1)	SFr (11.3)	SFr 2.9
Weighted average number of shares outstanding, basic (in shares)	25,977,316	25,977,316	25,977,316
Weighted average number of shares outstanding, diluted (in shares)	25,977,316	25,977,316	25,977,316
Adjusted weighted average of shares outstanding, basic (in shares)	25,977,316	25,977,316	25,977,316
Adjusted weighted average of shares outstanding, diluted (in shares)	25,977,316	25,977,316	25,977,316
Diluted earnings (loss) per share (in SFr per share)	SFr (0.5)	SFr (0.4)	SFr 0.1
Basic earnings (loss) per share (in SFr per share)	SFr (0.5)	SFr (0.4)	SFr 0.1

EARNINGS PER SHARE - Schedule_2

EARNINGS PER SHARE - Schedule of Shares Outstanding (Details) - shares	8 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024
Reconciliation of number of shares outstanding [abstract]
Less treasury shares (in shares)		(1,000,000)
Shares distributed from treasury shares (in shares)		99,186
Class A Common Shares
Reconciliation of number of shares outstanding [abstract]
Shares distributed as of spin date, beginning balance (in shares)	69,759,702	194
Less treasury shares (in shares)	(1,000,000)
Shares distributed from treasury shares (in shares)	99,186
Shares outstanding as of December 31 (in shares)	68,858,888	68,858,888
Class B Common Shares
Reconciliation of number of shares outstanding [abstract]
Shares distributed as of spin date, beginning balance (in shares)	25,977,316
Less treasury shares (in shares)	0
Shares distributed from treasury shares (in shares)	0
Shares outstanding as of December 31 (in shares)	25,977,316	25,977,316

EARNINGS PER SHARE - Schedule_3

EARNINGS PER SHARE - Schedule of Antidilutive Shares (Details)	12 Months Ended
	Dec. 31, 2024 shares
Earnings per share [line items]
Number of potential ordinary shares that are antidilutive in period presented (in shares)	2,684,761
PSUs
Earnings per share [line items]
Number of potential ordinary shares that are antidilutive in period presented (in shares)	421,608
RSUs
Earnings per share [line items]
Number of potential ordinary shares that are antidilutive in period presented (in shares)	399,399
SARs
Earnings per share [line items]
Number of potential ordinary shares that are antidilutive in period presented (in shares)	461,244
Legacy LG RSU plans
Earnings per share [line items]
Number of potential ordinary shares that are antidilutive in period presented (in shares)	1,402,510

FINANCIAL INCOME AND EXPENSES_2

FINANCIAL INCOME AND EXPENSES (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finance expenses:
Interest expense	SFr (432.9)	SFr (431.1)	SFr (338.5)
Losses on debt modification and extinguishment	(4)	(0.1)	0
Realized and unrealized losses on derivative instruments	0	(524.5)	0
Foreign currency transaction losses	(295.2)	0	0
Gains (losses) due to changes in fair values of certain investments and debt, net	(6.1)	0	0
Other expense, net	(4.4)	(1.5)	(1.7)
Financial expenses	(742.6)	(957.2)	(340.2)
Finance income:
Interest income	8.1	3	1.5
Realized and unrealized gains on derivative instruments	249.6	0	348.4
Foreign currency transaction gains	0	568.6	2.8
Gains (losses) due to changes in fair values of certain investments and debt, net	0	3.1	104
Financial income	SFr 257.7	SFr 574.7	SFr 456.7

BORROWINGS - Third-Party Debt (

BORROWINGS - Third-Party Debt (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]
Undrawn borrowing facilities	SFr 662
Borrowings	SFr 4,676.8	SFr 5,425.7
Weighted average [member]
Disclosure of detailed information about borrowings [line items]
Interest rate	5.48%
Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 4,687.1	5,443.8
Deferred Financing Costs, Discounts And Premiums, Net
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr (10.3)	(18.1)
Deferred Financing Costs, Discounts And Premiums, Net | Weighted average [member]
Disclosure of detailed information about borrowings [line items]
Interest rate	3%
Sunrise holding bank facility
Disclosure of detailed information about borrowings [line items]
Undrawn borrowing facilities	SFr 662	673.2
Borrowings	SFr 2,231.2	3,029.5
Sunrise holding bank facility | Weighted average [member]
Disclosure of detailed information about borrowings [line items]
Interest rate	6.64%
Sunrise holding bank facility | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 2,239	3,043.3
Sunrise holding SPE notes
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 1,467.2	1,394.8
Sunrise holding SPE notes | Weighted average [member]
Disclosure of detailed information about borrowings [line items]
Interest rate	4.58%
Sunrise holding SPE notes | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 1,468.8	1,397.1
Sunrise holding senior note
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 628	691.3
Sunrise holding senior note | Weighted average [member]
Disclosure of detailed information about borrowings [line items]
Interest rate	4.80%
Sunrise holding senior note | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 629.3	693.3
Vendor financing | Weighted average [member]
Disclosure of detailed information about borrowings [line items]
Interest rate	3.08%
Vendor financing | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 350	SFr 310.1

BORROWINGS - Reconciliation of

BORROWINGS - Reconciliation of Third-Party Debt (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 4,676.8	SFr 5,425.7
Accrued interest on third-party debt	57.4	60.4
Related party debt	0	51.2
Total debt including interest and related party debt	4,734.2	5,537.3
Current portion of debt	407.4	370.5
Non-current portion of debt	4,326.8	5,166.8
Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	4,687.1	5,443.8
Deferred Financing Costs, Discounts And Premiums, Net
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr (10.3)	SFr (18.1)

BORROWINGS - Summary of Bank Fa

BORROWINGS - Summary of Bank Facility (Details) € in Millions, SFr in Millions, $ in Millions	Dec. 31, 2024 CHF (SFr)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2023 CHF (SFr)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 4,676.8			SFr 5,425.7
Undrawn borrowing facilities	662
Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	4,687.1			5,443.8
Sunrise holding bank facility
Disclosure of detailed information about borrowings [line items]
Borrowings	2,231.2			3,029.5
Undrawn borrowing facilities	662			673.2
Sunrise holding bank facility | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 2,239			SFr 3,043.3
AT
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis	2.40%	2.40%	2.40%	2.25%	2.25%	2.25%
Facility amount (in borrowing currency) | $		$ 700			$ 700
Borrowings	SFr 633.8			SFr 585.6
Undrawn borrowing facilities	0			0
AT | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 635.4			SFr 587.4
AU
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Facility amount (in borrowing currency) | €			€ 400			€ 400
Borrowings	SFr 374.7			SFr 370.1
Undrawn borrowing facilities	0			0
AU | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 375.8			SFr 371.4
AX
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis	3%	3%	3%	3%	3%	3%
Facility amount (in borrowing currency) | $		$ 1,044.7			$ 1,717
Borrowings	SFr 944			SFr 1,432.8
Undrawn borrowing facilities	0			0
AX | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 948.3			SFr 1,441
AY
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis	3%	3%	3%	3%	3%	3%
Facility amount (in borrowing currency) | €			€ 297.6			€ 693
Borrowings	SFr 278.8			SFr 641
Undrawn borrowing facilities	0			0
AY | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 279.6			SFr 643.5
Revolving Facility A
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Facility amount (in borrowing currency) | €			€ 10			€ 88
Borrowings	SFr 0			SFr 0
Undrawn borrowing facilities	9.4			60.4
Revolving Facility A | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 0			SFr 0
Revolving Facility B
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis	2.50%	2.50%	2.50%	2.50%	2.50%	2.50%
Facility amount (in borrowing currency) | €			€ 720			€ 660
Borrowings	SFr 0			SFr 0
Undrawn borrowing facilities	652.6			612.8
Revolving Facility B | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 0			SFr 0

BORROWINGS - Additional Informa

BORROWINGS - Additional Information (Details) € in Millions, SFr in Millions, $ in Millions	Dec. 31, 2024 CHF (SFr)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Oct. 31, 2024	Dec. 31, 2023 CHF (SFr)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 4,676.8				SFr 5,425.7
Reference rate, floor	0%	0%	0%
Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 4,687.1				5,443.8
Sunrise Holding Revolving Facility
Disclosure of detailed information about borrowings [line items]
Facility amount (in borrowing currency)	685.8				694.6
Ancillary Facility
Disclosure of detailed information about borrowings [line items]
Facility amount (in borrowing currency)	56.4				21.4
Borrowings	23.8				21.4
Sunrise holding bank facility
Disclosure of detailed information about borrowings [line items]
Borrowings	2,231.2				3,029.5
Sunrise holding bank facility | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	2,239				3,043.3
5.50% senior notes
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 358.1				SFr 378.5
Interest rate	5.50%	5.50%	5.50%	5.50%	5.50%	5.50%	5.50%
5.50% senior notes | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 358.9	$ 395.3			SFr 379.6	$ 452.3
3.875% senior notes
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 269.9				SFr 312.8
Interest rate	3.875%	3.875%	3.875%	3.875%	3.875%	3.875%	3.875%
3.875% senior notes | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 270.4		€ 287.9		SFr 313.7		€ 337.9
4.875% senior notes
Disclosure of detailed information about borrowings [line items]
Interest rate				4.875%

BORROWINGS - SPE Notes (Details

BORROWINGS - SPE Notes (Details) € in Millions, SFr in Millions, $ in Millions	Dec. 31, 2024 CHF (SFr)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2023 CHF (SFr)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 4,676.8			SFr 5,425.7
Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	4,687.1			5,443.8
Sunrise holding SPE notes
Disclosure of detailed information about borrowings [line items]
Borrowings	1,467.2			1,394.8
Sunrise holding SPE notes | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 1,468.8			SFr 1,397.1
2031 Sunrise holding senior secured notes
Disclosure of detailed information about borrowings [line items]
Interest rate	4.88%	4.88%	4.88%	4.88%	4.88%	4.88%
Original issue amount | $		$ 1,250			$ 1,250
Borrowings	SFr 1,115.9			SFr 1,048
2031 Sunrise holding senior secured notes | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 1,116.6	$ 1,230		SFr 1,049	$ 1,250
UPCB finance VII euro notes
Disclosure of detailed information about borrowings [line items]
Interest rate	3.63%	3.63%	3.63%	3.63%	3.63%	3.63%
Original issue amount | €			€ 600			€ 600
Borrowings	SFr 351.3			SFr 346.8
UPCB finance VII euro notes | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 352.2		€ 374.9	SFr 348.1		€ 374.9

BORROWINGS - Senior Notes (Deta

BORROWINGS - Senior Notes (Details) € in Millions, SFr in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 CHF (SFr)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Oct. 31, 2024	Dec. 31, 2023 CHF (SFr)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 EUR (€)
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 4,676.8				SFr 5,425.7
Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 4,687.1				5,443.8
Sunrise holding senior note
Disclosure of detailed information about borrowings [line items]
Redemption price	101%
Borrowings	SFr 628				691.3
Sunrise holding senior note | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 629.3				SFr 693.3
3.875% senior notes
Disclosure of detailed information about borrowings [line items]
Interest rate	3.875%	3.875%	3.875%	3.875%	3.875%	3.875%	3.875%
Original issue amount | €			€ 635				€ 635
Borrowings	SFr 269.9				SFr 312.8
3.875% senior notes | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 270.4		€ 287.9		SFr 313.7		€ 337.9
5.50% senior notes
Disclosure of detailed information about borrowings [line items]
Interest rate	5.50%	5.50%	5.50%	5.50%	5.50%	5.50%	5.50%
Original issue amount | $		$ 550				$ 550
Borrowings	SFr 358.1				SFr 378.5
5.50% senior notes | Principal amount
Disclosure of detailed information about borrowings [line items]
Borrowings	SFr 358.9	$ 395.3			SFr 379.6	$ 452.3

FINANCIAL INSTRUMENTS & RISK -

FINANCIAL INSTRUMENTS & RISK - Foreign Currency Sensitivity (Details) - Currency risk - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Euro
Related party long-term payables
Changes in %	10%
Effect on profit before tax	SFr 177.4	SFr 279.1
US Dollar
Related party long-term payables
Changes in %	10%
Effect on profit before tax	SFr 380.4	SFr 477.8

FINANCIAL INSTRUMENTS & RISK _2

FINANCIAL INSTRUMENTS & RISK - Interest Rate Risk (Details) - Interest rate risk - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Related party long-term payables
Effect on profit before tax	SFr 13	SFr 20.5
Changes in %	0.10%

FINANCIAL INSTRUMENTS & RISK _3

FINANCIAL INSTRUMENTS & RISK - Maturity Analysis (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Related party long-term payables
Trade payables and other payables	SFr 786.4
Borrowings – notional	4,337.1
Borrowings – interest	1,145.5
Lease liabilities (undiscounted)	1,667.1	SFr 1,748.9
Derivatives	312.6
Within 1 year
Related party long-term payables
Trade payables and other payables	741.7
Borrowings – notional	0
Borrowings – interest	246.1
Lease liabilities (undiscounted)	164.1	170.4
Derivatives	175.7
Between 1 and 2 years
Related party long-term payables
Trade payables and other payables	14.7
Borrowings – notional	0
Borrowings – interest	484.2
Lease liabilities (undiscounted)	152	153.9
Derivatives	127.7
Between 2 and 5 years
Related party long-term payables
Trade payables and other payables	15
Borrowings – notional	3,220.6
Borrowings – interest	360.8
Lease liabilities (undiscounted)	425.3
Derivatives	9.2
Over 5 years
Related party long-term payables
Trade payables and other payables	15
Borrowings – notional	1,116.5
Borrowings – interest	54.4
Lease liabilities (undiscounted)	925.7	SFr 1,002.2
Derivatives	SFr 0

FINANCIAL INSTRUMENTS & RISK _4

FINANCIAL INSTRUMENTS & RISK - Undrawn Borrowing Facilities (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Related party long-term payables
Borrowings	SFr 4,676.8	SFr 5,425.7
Sunrise Holding Revolving Facility
Related party long-term payables
Facility amount (in borrowing currency)	685.8	694.6
Ancillary Facility
Related party long-term payables
Facility amount (in borrowing currency)	56.4	21.4
Borrowings	SFr 23.8	SFr 21.4

FINANCIAL INSTRUMENTS & RISK _5

FINANCIAL INSTRUMENTS & RISK - Credit Risk (Details) - CHF (SFr) SFr in Thousands	Dec. 31, 2024	Dec. 31, 2023
Related party long-term payables
Financial assets, carrying amount	SFr 167,600	SFr 530,100
Credit risk | Derivatives
Related party long-term payables
Financial assets, carrying amount	190
Credit risk | Trade receivables
Related party long-term payables
Financial assets, carrying amount	387,300
Credit risk | Cash and Cash Equivalents
Related party long-term payables
Financial assets, carrying amount	SFr 352,400

FINANCIAL INSTRUMENTS & RISK _6

FINANCIAL INSTRUMENTS & RISK - Allowance for Expected Credit Losses (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Increase (decrease) in financial assets [abstract]
Allowance at January 1	SFr 530.1
Allowance at December 31	167.6	SFr 530.1
Accumulated impairment | Trade receivables
Increase (decrease) in financial assets [abstract]
Allowance at January 1	(30.6)	(22.2)
Provisions for impairment of trade receivables	(30.8)	(15.6)
Write-off of receivables	29.5	7.2
Allowance at December 31	SFr (31.9)	SFr (30.6)

FINANCIAL INSTRUMENTS & RISK _7

FINANCIAL INSTRUMENTS & RISK - Schedule of Detailed Aging Analysis (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Related party long-term payables
Amounts receivable, related party transactions	SFr 1.8	SFr 208.6
Current financial assets	162.5	237
Financial assets	5.1	293.1
Trade receivables
Related party long-term payables
Current financial assets	353	390.9
Financial assets	SFr 34.3	SFr 44
Non-current trade receivables gross - Aging %	100%	100%
Trade receivables | Principal amount
Related party long-term payables
Amounts receivable, related party transactions	SFr 0.2
Current financial assets	SFr 327.5	SFr 378
Aging percentage	100%	100%
Financial assets	SFr 34.3	SFr 44
Trade receivables | Accumulated impairment
Related party long-term payables
Current financial assets	SFr (31.9)	SFr (30.6)
Aging percentage	100%	100%
Trade receivables - Provision %	9.70%	8.10%
Trade Receivables, Netting | Principal amount
Related party long-term payables
Amounts receivable, related party transactions		SFr (0.1)
Accrued Income
Related party long-term payables
Current financial assets	SFr 57.2	SFr 43.6
Financial assets neither past due nor impaired | Current (not due) | Trade receivables
Related party long-term payables
Non-current trade receivables gross - Aging %	100%	100%
Financial assets neither past due nor impaired | Current (not due) | Trade receivables | Principal amount
Related party long-term payables
Current financial assets	SFr 153.8	SFr 227.2
Aging percentage	47%	60.10%
Financial assets	SFr 34.3	SFr 44
Financial assets neither past due nor impaired | Current (not due) | Trade receivables | Accumulated impairment
Related party long-term payables
Current financial assets	SFr (1)	SFr (0.8)
Aging percentage	3.10%	2.50%
Trade receivables - Provision %	0.60%	0.30%
Financial assets past due but not impaired | 1-30 days (overdue) | Trade receivables
Related party long-term payables
Non-current trade receivables gross - Aging %	0%	0%
Financial assets past due but not impaired | 1-30 days (overdue) | Trade receivables | Principal amount
Related party long-term payables
Current financial assets	SFr 100.9	SFr 42.2
Aging percentage	30.80%	11.20%
Financial assets past due but not impaired | 1-30 days (overdue) | Trade receivables | Accumulated impairment
Related party long-term payables
Current financial assets	SFr (0.9)	SFr (0.6)
Aging percentage	2.80%	1.80%
Trade receivables - Provision %	0.90%	1.30%
Financial assets past due but not impaired | 31-60 days (overdue) | Trade receivables
Related party long-term payables
Non-current trade receivables gross - Aging %	0%	0%
Financial assets past due but not impaired | 31-60 days (overdue) | Trade receivables | Principal amount
Related party long-term payables
Current financial assets	SFr 15.7	SFr 22.4
Aging percentage	4.80%	5.90%
Financial assets past due but not impaired | 31-60 days (overdue) | Trade receivables | Accumulated impairment
Related party long-term payables
Current financial assets	SFr (2.4)	SFr (2.1)
Aging percentage	7.60%	6.90%
Trade receivables - Provision %	15.40%	9.40%
Financial assets past due but not impaired | 61-90 days (overdue) | Trade receivables
Related party long-term payables
Non-current trade receivables gross - Aging %	0%	0%
Financial assets past due but not impaired | 61-90 days (overdue) | Trade receivables | Principal amount
Related party long-term payables
Current financial assets	SFr 12.7	SFr 10.1
Aging percentage	3.90%	2.70%
Financial assets past due but not impaired | 61-90 days (overdue) | Trade receivables | Accumulated impairment
Related party long-term payables
Current financial assets	SFr (1.8)	SFr (1.4)
Aging percentage	5.60%	4.40%
Trade receivables - Provision %	14.20%	13.40%
Financial assets past due but not impaired | 91-120 days (overdue) | Trade receivables
Related party long-term payables
Non-current trade receivables gross - Aging %	0%	0%
Financial assets past due but not impaired | 91-120 days (overdue) | Trade receivables | Principal amount
Related party long-term payables
Current financial assets	SFr 6.2	SFr 9.7
Aging percentage	1.90%	2.60%
Financial assets past due but not impaired | 91-120 days (overdue) | Trade receivables | Accumulated impairment
Related party long-term payables
Current financial assets	SFr (1.7)	SFr (1.1)
Aging percentage	5.30%	3.50%
Trade receivables - Provision %	27.30%	11%
Financial assets past due but not impaired | 121-365 days (overdue) | Trade receivables
Related party long-term payables
Non-current trade receivables gross - Aging %	0%	0%
Financial assets past due but not impaired | 121-365 days (overdue) | Trade receivables | Principal amount
Related party long-term payables
Current financial assets	SFr 38.2	SFr 66.4
Aging percentage	11.70%	17.60%
Financial assets past due but not impaired | 121-365 days (overdue) | Trade receivables | Accumulated impairment
Related party long-term payables
Current financial assets	SFr (24.1)	SFr (24.6)
Aging percentage	75.60%	80.80%
Trade receivables - Provision %	63.10%	37.20%
Financial assets past due but not impaired | Over 365 days (overdue) | Trade receivables
Related party long-term payables
Non-current trade receivables gross - Aging %	0%	0%
Financial assets past due but not impaired | Over 365 days (overdue) | Trade receivables | Principal amount
Related party long-term payables
Current financial assets	SFr 0	SFr 0
Aging percentage	0%	0%
Financial assets	SFr 0	SFr 0
Financial assets past due but not impaired | Over 365 days (overdue) | Trade receivables | Accumulated impairment
Related party long-term payables
Current financial assets	SFr 0	SFr 0
Aging percentage	0%	0%
Trade receivables - Provision %	0%	0%

FINANCIAL INSTRUMENTS & RISK _8

FINANCIAL INSTRUMENTS & RISK - Financial Assets and Liabilities (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Related party long-term payables
Financial assets, carrying amount	SFr 167.6	SFr 530.1
Financial assets, at fair value	167.6	530.1
Financial liabilities	5,334.6	6,472.1
Financial liabilities, at fair value	5,093.6	6,300.9
Financial liabilities at fair value through profit or loss, category | Derivatives, Current
Related party long-term payables
Financial liabilities	179.3	179.7
Financial liabilities, at fair value	179.3	179.7
Financial liabilities at fair value through profit or loss, category | Derivatives, Noncurrent
Related party long-term payables
Financial liabilities	421.1	755.1
Financial liabilities, at fair value	421.1	755.1
Financial liabilities at amortised cost, category | Vendor financing
Related party long-term payables
Financial liabilities	350	310.1
Financial liabilities, at fair value	350	310.1
Financial liabilities at amortised cost, category | Accrued interest
Related party long-term payables
Financial liabilities	57.4	60.4
Financial liabilities, at fair value	57.4	60.4
Financial liabilities at amortised cost, category | Third-party debt
Related party long-term payables
Financial liabilities	4,326.8	5,115.6
Financial liabilities, at fair value	4,085.8	4,944.4
Financial liabilities at amortised cost, category | Related Party Long-Term Payable
Related party long-term payables
Financial liabilities	0	51.2
Financial liabilities, at fair value	0	51.2
Financial assets at fair value through profit or loss, category | Derivatives, Current
Related party long-term payables
Financial assets, carrying amount	162.5	237
Financial assets, at fair value	162.5	237
Financial assets at fair value through profit or loss, category | Derivatives, Noncurrent
Related party long-term payables
Financial assets, carrying amount	5.1	90.6
Financial assets, at fair value	5.1	90.6
Loans and receivables, category | Related party long-term receivables
Related party long-term payables
Financial assets, carrying amount	0	202.5
Financial assets, at fair value	SFr 0	SFr 202.5

FINANCIAL INSTRUMENTS & RISK _9

FINANCIAL INSTRUMENTS & RISK - Liabilities Arising From Financing Activities (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Changes in liabilities arising from financing activities [abstract]
Liabilities arising from financing activities at beginning of period	SFr 7,402.2	SFr 7,274.5	SFr 8,306.4
Cash flows from financing activities:
Interest paid	(420.2)	(422.5)	(329.3)
Vendor financing additions	363.4	271.2	148.2
Repayments of debt and lease liabilities	(1,179.1)	(107.6)	(1,011.8)
Principal payments on operating-related vendor financing	(327.9)	(171.8)	(198.2)
Principal payments on capital-related vendor financing	(49.1)	(124.8)	(86.3)
Payment of financing costs and debt premiums	0	0.1	(26.3)
Net cash received related to derivative instruments	52.3	117.1	(4.9)
Related-party payments	0	0	(149.2)
Total cash flows from financing activities	(1,560.6)	(438.3)	(1,657.7)
Losses on debt extinguishment	3.9		(2.8)
Realized and unrealized (gains) losses on derivative instruments, net	(249.6)	524.4	(348.4)
Interest accruals	428	426.6	338.1
Assets acquired under leases	126.3	56.2	343.9
Assets acquired under capital-related vendor financing arrangements, including VAT	52.1	77.6	117.5
Effect of changes in foreign exchange rates	287.4	(466.7)	(49)
Other related party charges	(51.8)	1.7	205.7
Other changes	(51.5)	(53.7)	20.8
Liabilities arising from financing activities at end of period	6,386.4	7,402.2	7,274.5
Unadjusted Difference
Cash flows from financing activities:
Interest paid			(329.2)
Debt and accrued interest
Changes in liabilities arising from financing activities [abstract]
Liabilities arising from financing activities at beginning of period	5,537.3	5,942.1	6,882.3
Cash flows from financing activities:
Interest paid	(359.2)	(364.1)	(267.6)
Vendor financing additions	363.4	271.2	148.2
Repayments of debt and lease liabilities	(1,064.7)	0	(899.4)
Principal payments on operating-related vendor financing	(327.9)	(171.8)	(198.2)
Principal payments on capital-related vendor financing	(49.1)	(124.8)	(86.3)
Payment of financing costs and debt premiums		0.1	(26.3)
Related-party payments			(149.2)
Total cash flows from financing activities	(1,437.5)	(389.4)	(1,478.8)
Losses on debt extinguishment	3.9		(2.8)
Interest accruals	358.2	358.7	272.8
Assets acquired under capital-related vendor financing arrangements, including VAT	52.1	77.6	117.5
Effect of changes in foreign exchange rates	271.8	(453.4)	(47.8)
Other related party charges	(51.8)	1.7	205.7
Other changes	0.2	0.1	(6.8)
Liabilities arising from financing activities at end of period	4,734.2	5,537.3	5,942.1
Derivatives
Changes in liabilities arising from financing activities [abstract]
Liabilities arising from financing activities at beginning of period	607.3	(15.5)	304
Cash flows from financing activities:
Net cash received related to derivative instruments	52.3	117.1	(4.9)
Total cash flows from financing activities	52.3	117.1	(4.9)
Realized and unrealized (gains) losses on derivative instruments, net	(249.6)	524.4	(348.4)
Effect of changes in foreign exchange rates	15.6	(13.3)	(1.2)
Other changes	7.3	(5.4)	35
Liabilities arising from financing activities at end of period	432.9	607.3	(15.5)
Lease liabilities
Changes in liabilities arising from financing activities [abstract]
Liabilities arising from financing activities at beginning of period	1,257.6	1,347.9	1,120.1
Cash flows from financing activities:
Interest paid	(61)	(58.4)	(61.6)
Repayments of debt and lease liabilities	(114.4)	(107.6)	(112.4)
Total cash flows from financing activities	(175.4)	(166)	(174)
Interest accruals	69.8	67.9	65.3
Assets acquired under leases	126.3	56.2	343.9
Effect of changes in foreign exchange rates	0
Other changes	(59)	(48.4)	(7.4)
Liabilities arising from financing activities at end of period	SFr 1,219.3	SFr 1,257.6	SFr 1,347.9

INVESTMENTS (Details)

INVESTMENTS (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of associates [line items]
Investments accounted for using equity method, beginning balance	SFr 55.6	SFr 55.9
Additions	0.6	0	SFr 35.8
Share of net results	1.3	(0.3)	2.2
Dividends	(3)	(3.1)
Other	(3)	0
Investments accounted for using equity method, ending balance	48.4	55.6	SFr 55.9
Unadjusted Difference
Disclosure of associates [line items]
Investments accounted for using equity method, beginning balance	SFr 52.5
Investments accounted for using equity method, ending balance		SFr 52.5

RELATED PARTY TRANSACTIONS - Su

RELATED PARTY TRANSACTIONS - Summary of Charges and Credits (Details) - CHF (SFr) SFr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Credits (charges) included in:
Revenue	SFr 3.1	SFr 4.6	SFr 2.9
Direct costs	(3.8)	(2.3)	(5.6)
Personnel expenses	(15.9)	(18.6)	(23)
Other operating expenses	(116.9)	(118.1)	(183.3)
Included in operating income (loss)	(133.5)	(134.4)	(209)
Finance expense	(1.5)	(1.7)	0
Finance income	3	2.1	1.1
Included in net income (loss)	(132)	(134)	(207.9)
Property and equipment transfers in, net	SFr 11.3	SFr 23.7	SFr 4.9

RELATED PARTY TRANSACTIONS - _2

RELATED PARTY TRANSACTIONS - Summary of Related Party Balances (Details) - CHF (SFr) SFr in Millions	Dec. 31, 2024	Dec. 31, 2023
Related Party [Abstract]
Current receivables	SFr 1.8	SFr 6.1
Long-term note receivables	0	202.5
Amounts receivable, related party transactions	1.8	208.6
Accounts payable	0.3	14.5
Accrued other liabilities	20.4	38.8
Related party debt	0	51.2
Other non-current liabilities	0.1	1.8
Amounts payable, related party transactions	SFr 20.8	SFr 106.3

BUSINESS COMBINATIONS (Details)

BUSINESS COMBINATIONS (Details) - Elektra Baselland Telecom SFr in Millions	Jan. 13, 2023 CHF (SFr)
Assets:
Cash and cash equivalents	SFr 5.2
Accounts receivable	3.6
Other receivables	0.6
Inventories	0.1
Accrued income	0.3
Property, plant and equipment	73.7
Intangible assets	8.1
Identifiable assets recognised as of acquisition date	91.6
Liabilities:
Accounts payable	(2.6)
Other current liabilities	(0.9)
Accrued liabilities	(0.7)
Deferred tax liabilities	(3.5)
Identifiable liabilities recognised as of acquisition date	(7.7)
Total identifiable net assets at fair value	83.9
Goodwill arising on acquisition	6.4
Total consideration transferred	90.3
Cash acquired with the subsidiary	(5.2)
Net cash paid for acquisition	SFr 85.1

SUBSIDIAIRIES AND ASSOCIATES (D

SUBSIDIAIRIES AND ASSOCIATES (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
ello communications S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	60%	60%
Proportion of voting rights held by non-controlling interests	60%	60%
Sitel S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	66.70%	66.70%
Proportion of voting rights held by non-controlling interests	66.70%	66.70%
Sunrise Financing Partnership
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	100%
Proportion of voting rights held by non-controlling interests	100%	100%
Sunrise FinCo I B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	100%
Proportion of voting rights held by non-controlling interests	100%	100%
Sunrise FinCo II B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	100%
Proportion of voting rights held by non-controlling interests	100%	100%
Sunrise GmbH
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	100%
Proportion of voting rights held by non-controlling interests	100%	100%
Sunrise HoldCo I B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	100%
Proportion of voting rights held by non-controlling interests	100%	100%
Sunrise HoldCo II B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	100%
Proportion of voting rights held by non-controlling interests	100%	100%
Sunrise HoldCo III B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	100%
Proportion of voting rights held by non-controlling interests	100%	100%
Sunrise HoldCo IV B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	100%
Proportion of voting rights held by non-controlling interests	100%	100%
Sunrise HoldCo V B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	0%
Proportion of voting rights held by non-controlling interests	100%	0%
Sunrise HoldCo VI B.V.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	0%
Proportion of voting rights held by non-controlling interests	100%	0%
Sunrise Portugal S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	100%
Proportion of voting rights held by non-controlling interests	100%	100%
Swiss Open Fiber AG
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	100%	100%
Proportion of voting rights held by non-controlling interests	100%	100%
Télédistal S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	38.90%	38.90%
Proportion of voting rights held by non-controlling interests	38.90%	38.90%
Télévaux S.A.
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	80%	80%
Proportion of voting rights held by non-controlling interests	80%	80%
UPCB Finance VII Limited
Disclosure of subsidiaries [line items]
Proportion of ownership interests held by non-controlling interests	0%	0%
Proportion of voting rights held by non-controlling interests	0%	0%
CH Media TV AG
Disclosure of associates [line items]
Proportion of ownership interest in associate	20%	20%
Proportion of voting rights held in associate	20%	20%
ITV Betriebsgesellschaft GmbH
Disclosure of associates [line items]
Proportion of ownership interest in associate	50%	50%
Proportion of voting rights held in associate	50%	50%
Naxoo S.A
Disclosure of associates [line items]
Proportion of ownership interest in associate	48.90%	48.90%
Proportion of voting rights held in associate	48.90%	48.90%
REGIONALE GEMEINSCHAFTSANTENNEN-ANLAGE SPIEZ AG REGAS
Disclosure of associates [line items]
Proportion of ownership interest in associate	30%	30%
Proportion of voting rights held in associate	30%	30%
Swiss-Ski Store GmbH
Disclosure of associates [line items]
Proportion of ownership interest in associate	50%	0%
Proportion of voting rights held in associate	50%	0%
TELDAS GmbH
Disclosure of associates [line items]
Proportion of ownership interest in associate	23%	23%
Proportion of voting rights held in associate	23%	23%

EVENTS AFTER THE BALANCE SHEE_2

EVENTS AFTER THE BALANCE SHEET DATE (Details) SFr in Millions, $ in Millions	Feb. 04, 2025 USD ($)	Dec. 31, 2024 CHF (SFr)	Dec. 31, 2023 CHF (SFr)
Disclosure of non-adjusting events after reporting period [line items]
Borrowings | SFr		SFr 4,676.8	SFr 5,425.7
Term Loan B Due 2032 | Entering into significant commitments or contingent liabilities
Disclosure of non-adjusting events after reporting period [line items]
Borrowings | $	$ 1,300
Borrowings, percentage of par value	99.75%
Interest rate	2.50%