OneStream, Inc. Class A Common Stock (OS) 10-K 27 Feb 25 2024 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Feb. 24, 2025	Jun. 25, 2024
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Entity Registrant Name	OneStream, Inc.
Entity Central Index Key	0001889956
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	OS
Entity File Number	001-42187
Security Exchange Name	NASDAQ
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	87-3199478
Entity Address, Address Line One	191 N. Chester Street
Entity Address, City or Town	Birmingham
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48009
City Area Code	248
Local Phone Number	650-1490
Document Annual Report	true
Document Transition Report	false
Entity Public Float			$ 759.6
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Detroit, MI
Auditor Opinion	Opinion on the Financial Statements We have audited the accompanying consolidated balance sheets of OneStream, Inc. (the Company) as of December 31, 2024 and 2023, the related consolidated statements of operations, comprehensive loss, stockholders’ / members’ equity and cash flows for each of the three years in the period ended December 31, 2024, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with U.S. generally accepted accounting principles.
Documents Incorporated by Reference [Text Block]	Documents Incorporated by Reference Portions of the Registrant’s Definitive Proxy Statement relating to the Annual Meeting of Stockholders to be held in 2025 are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. Such Definitive Proxy Statement will be filed with the Securities and Exchange Commission within 120 days after the end of the Registrant’s fiscal year ended December 31, 2024.
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		73,114,192
Class C Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		63,929,619
Class D Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		101,651,168

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents		$ 544,174	$ 117,087
Accounts receivable, net		129,014	107,308
Unbilled accounts receivable		23,294	31,519
Deferred commissions		20,682	17,225
Prepaid expenses and other current assets		20,202	13,098
Total current assets		737,366	286,237
Unbilled accounts receivable, noncurrent		800	2,009
Deferred commissions, noncurrent		44,228	41,030
Operating lease right-of-use assets		16,705	18,559
Property and equipment, net		10,084	10,266
Intangible assets, net		2,567
Goodwill		9,280
Other noncurrent assets		2,191	3,458
Total assets		823,221	361,559
Liabilities, Current [Abstract]
Accounts payable		19,563	8,274
Accrued compensation		27,543	22,436
Accrued commissions		9,007	10,158
Deferred revenue, current		239,291	177,465
Operating lease liabilities, current		3,237	2,505
Other accrued expenses and current liabilities		13,534	11,532
Total current liabilities		312,175	232,370
Deferred revenue, noncurrent		4,515	5,141
Operating lease liabilities, noncurrent		15,357	17,522
Other noncurrent liabilities		216
Total liabilities		332,263	255,033
Commitments and Contingencies
Members' Equity [Abstract]
Members' interest			281,306
Preferred stock, $0.0001 par value, 100,000,000 shares authorized, no shares issued or outstanding as of December 31, 2024
Additional paid-in capital		718,084
Accumulated other comprehensive loss		(599)	(625)
Accumulated deficit		(331,334)	(174,155)
Total members' equity		386,174	106,526
Non-controlling interests		104,784
Total stockholders' / members' equity		490,958	106,526
Total liabilities and members' equity		823,221	$ 361,559
Class A Common Stock
Members' Equity [Abstract]
Common stock		5
Class C Common Stock
Members' Equity [Abstract]
Common stock	[1]	6
Class D Common Stock
Members' Equity [Abstract]
Common stock	[1]	$ 12
[1] Each share of Class C common stock is convertible at any time at the option of the holder into one share of Class B common stock, and each share of Class D common stock is convertible at any time at the option of the holder into one share of Class A common stock. Refer to Note 9 in the accompanying notes for details.

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical)	Dec. 31, 2024 $ / shares shares
Preferred stock, par value | $ / shares	$ 0.0001
Preferred stock, shares authorized	100,000,000
Preferred stock, shares issued	0
Preferred stock, shares outstanding	0
Class A common stock
Common stock, par value | $ / shares	$ 0.0001
Common stock, shares authorized	2,500,000,000
Common stock, shares issued	51,456,091
Common stock, shares outstanding	51,456,091
Class B common stock
Common stock, par value | $ / shares	$ 0.0001
Common stock, shares authorized	300,000,000
Common stock, shares issued	0
Common stock, shares outstanding	0
Class C common stock
Common stock, par value | $ / shares	$ 0.0001
Common stock, shares authorized	300,000,000
Common stock, shares issued	63,929,619
Common stock, shares outstanding	63,929,619
Class D Common Stock
Common stock, par value | $ / shares	$ 0.0001
Common stock, shares authorized	600,000,000
Common stock, shares issued	122,196,307
Common stock, shares outstanding	122,196,307

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Total revenue		$ 489,407	$ 374,921	$ 279,324
Cost of revenues:
Total cost of revenue		179,329	114,502	92,510
Gross profit		310,078	260,419	186,814
Operating expenses:
Sales and marketing		328,843	175,795	153,283
Research and development	[1]	156,812	55,289	43,132
General and administrative		143,951	59,847	49,684
Total operating expenses		629,606	290,931	246,099
Loss from operations		(319,528)	(30,512)	(59,285)
Interest income (expense), net		14,248	4,062	(53)
Other income (expense), net		498	(1,065)	(5,469)
Loss before income taxes		(304,782)	(27,515)	(64,807)
Provision for income taxes		1,877	1,416	659
Net loss		(306,659)	(28,931)	(65,466)
Less: Net loss attributable to non-controlling interests		(90,458)
Net loss attributable to OneStream, Inc.		(216,201)	(28,931)	(65,466)
Subscription
Revenues:
Total revenue		428,150	302,923	195,074
Cost of revenues:
Total cost of revenue		112,914	74,146	47,556
License
Revenues:
Total revenue		31,779	40,518	50,450
Professional services and other
Revenues:
Total revenue		29,478	31,480	33,800
Cost of revenues:
Total cost of revenue		$ 66,415	$ 40,356	$ 44,954
Class A and Class D common stock
Operating expenses:
Net loss per share of Class A and Class D common stock--basic	[2]	$ (1.23)
Net loss per share of Class A and Class D common stock--diluted	[2]	$ (1.25)
Weighted-average shares of Class A and Class D common stock outstanding-basic	[2]	163,469
Weighted-average shares of Class A and Class D common stock outstanding-diluted	[2]	234,043
[1] Amounts include certain expenses incurred with related parties. Refer to Note 14 in the accompanying notes for details. Represents net loss per share of Class A common stock and Class D common stock and weighted-average shares of Class A common stock and Class D common stock outstanding for the period following the Reorganization Transactions as described in Note 1, Organization and Description of Business. Refer to Note 12, Net Loss per Share, in the accompanying notes for additional details.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (306,659)	$ (28,931)	$ (65,466)
Other comprehensive loss:
Foreign currency translation and other	26	(196)	462
Comprehensive loss	(306,633)	(29,127)	(65,004)
Less: Comprehensive loss attributable to non-controlling interests	(90,477)
Comprehensive loss attributable to OneStream, Inc.	$ (216,156)	$ (29,127)	$ (65,004)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' / MEMBERS' EQUITY - USD ($) $ in Thousands	Total	IPO	Member's Interest	Member's Interest IPO	Common Stock Class A common stock	Common Stock Class A common stock IPO	Common Stock Class C Common Stock	Common Stock Class C Common Stock IPO	Common Stock Class D Common Stock	Common Stock Class D Common Stock IPO	Additional Paid-in Capital	Additional Paid-in Capital IPO	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss IPO	Accumulated Deficit	Accumulated Deficit IPO	Non-controlling Interests	Non-controlling Interests IPO
Beginning balance at Dec. 31, 2022	$ 127,136		$ 272,789										$ (429)		$ (145,224)
Net loss	(28,931)														(28,931)
Equity-based compensation	8,270		8,270
Exercise of common unit options/ Stock option exercises, value	247		247
Foreign currency translation and other	(196)												(196)
Ending balance at Dec. 31, 2023	106,526		281,306										(625)		(174,155)
Net loss	(14,644)														(14,644)
Equity-based compensation	4,928		4,928
Units issued in connection with acquisition, value	244		244
Foreign currency translation and other	(211)												(211)
Ending balance at Jul. 23, 2024	96,843		286,478										(836)		(188,799)
Beginning balance at Dec. 31, 2023	106,526		281,306										(625)		(174,155)
Net loss	(306,659)
Effect of exchange of Class C Common Stock, value	136,600
Foreign currency translation and other	26
Ending balance (in units) at Dec. 31, 2024					51,456,091		63,929,619		122,196,307
Ending balance at Dec. 31, 2024	490,958				$ 5		$ 6		$ 12		$ 718,084		(599)		(331,334)		$ 104,784
Beginning balance at Jul. 23, 2024	96,843		$ 286,478										(836)		(188,799)
Net loss	(292,015)														(201,557)		(90,458)
Effect of Reorganization Transactions, Shares								74,135,230		132,081,358
Effect of Reorganization Transactions, Value				$ (286,478)				$ 7		$ 13		$ 286,458
Equity-based compensation	107,034	$ 204,435									101,551	204,435					5,483
Issuance of Class A common stock sold in initial public offering, net of underwriting discounts commissions and offering costs, shares						27,715,770
Issuance of Class A common stock sold in initial public offering, net of underwriting discounts commissions and offering costs		402,530				$ 3						402,527
Stock option exercises, shares					3,185,565	459,230
Exercise of common unit options/ Stock option exercises, value	25,740	3,251									25,740	3,251
Repurchase of LLC Units		$ (56,663)										(56,663)
Allocation of equity to non-controlling interests												$ (262,603)		$ 261		$ 59,022		$ 203,320
Vesting of restricted stock units					4,864
Effect of exchange of Class C Common Stock, shares					2,840,662		(2,840,662)
Effect of exchange of Class C Common Stock, value											4,706		7				(4,713)
Effects Of Secondary Offering, Value					$ 2		$ (1)		$ (1)		12,309		19				(12,328)
Effects Of Secondary Offering, Shares					17,250,000		(7,364,949)		(9,885,051)
Foreign currency translation and other	(197)										(128)		(50)				(19)
Non-controlling interest adjustment for changes in proportionate ownership in OneStream Software LLC											(3,499)						3,499
Ending balance (in units) at Dec. 31, 2024					51,456,091		63,929,619		122,196,307
Ending balance at Dec. 31, 2024	$ 490,958				$ 5		$ 6		$ 12		$ 718,084		$ (599)		$ (331,334)		$ 104,784

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net loss	$ (306,659)	$ (28,931)	$ (65,466)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	3,655	2,887	2,685
Noncash operating lease expense	2,908	2,433	2,171
Amortization of deferred commissions	20,440	16,977	14,746
Equity-based compensation	316,397	8,270	8,263
Other noncash operating activities, net	(980)	3,249	5,885
Changes in operating assets and liabilities:
Accounts receivable, net	(13,361)	(11,668)	(34,800)
Deferred commissions	(27,095)	(26,381)	(27,238)
Prepaid expenses and other assets	(9,277)	(9,971)	(19,040)
Accounts payable	16,546	(11,644)	3,912
Deferred revenue	61,199	66,233	54,650
Accrued and other liabilities	(2,621)	9,811	21,291
Net cash provided by (used in) operating activities	61,152	21,265	(32,941)
Cash flows from investing activities:
Purchases of property and equipment	(2,618)	(2,589)	(4,976)
Acquisition of business, net of cash acquired	(7,594)
Sales of marketable securities		87,339	41,300
Purchases of marketable securities			(1,447)
Net cash (used in) provided by investing activities	(10,212)	84,750	34,877
Cash flows from financing activities:
Proceeds from initial public offering, net of underwriting discounts and commissions	409,598
Repurchase of LLC Units	(263,372)
Payments of deferred offering costs	(5,437)		(1,919)
Proceeds from Secondary Offering	206,709
Proceeds from option exercises	28,955	247
Payments of deferred financing costs		(546)
Proceeds from borrowings on revolving credit facility			3,500
Repayments of borrowings on revolving credit facility		(3,500)
Principal payments on finance lease obligation		(46)	(106)
Net cash provided by (used in) financing activities	376,453	(3,845)	1,475
Effect of exchange rate changes on cash and cash equivalents	(306)	230	(201)
Net increase in cash and cash equivalents	427,087	102,400	3,210
Cash and cash equivalents - Beginning of period	117,087	14,687	11,477
Cash and cash equivalents - End of period	544,174	117,087	14,687
Supplemental disclosures of cash flow information
Cash paid for interest	1	23	38
Cash paid for income taxes	1,714	839	1,207
Supplemental disclosures of noncash investing and financing activities
Purchases of property and equipment included in liabilities	220	363	198
Lease liabilities arising from obtaining right-of-use assets	1,349	$ 6,861	$ 10,411
Deferred offering costs, accrued but unpaid	$ 1,763

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ (216,201)	$ (28,931)	$ (65,466)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	Rule 10b5-1 Trading Plans During the three months ended December 31, 2024, the following director and officer, respectively, adopted a Rule 10b5-1 trading arrangement as defined in Regulation S-K Item 408, as follows: On November 22, 2024 , John Kinzer , a member of our board of directors , adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 130,000 shares of our Class A common stock. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until December 31, 2025 , or earlier if all transactions under the trading arrangement are completed. On December 13, 2024 , Craig Colby , our president , adopted a Rule 10b5-1 trading arrangement providing for the sale from time to time of an aggregate of up to 280,000 shares of our Class A common stock. The trading arrangement is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until December 16, 2025 , or earlier if all transactions under the trading arrangement are completed. During the three months ended December 31, 2024, no other directors or officers, as defined in Rule 16a-1(f) under the Exchange Act, adopted, modified or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408 of Regulation S-K.
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Rule 10b5-1 Arrangement Modified	false
Non-Rule 10b5-1 Arrangement Modified	false
John Kinzer [Member]
Trading Arrangements, by Individual
Name	John Kinzer
Title	member of our board of directors
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	November 22, 2024
Expiration Date	December 31, 2025
Arrangement Duration	405 days
Aggregate Available	130,000
Craig Colby [Member]
Trading Arrangements, by Individual
Name	Craig Colby
Title	president
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 13, 2024
Expiration Date	December 16, 2025
Arrangement Duration	368 days
Aggregate Available	280,000

Cybersecurity Risk Management,

Cybersecurity Risk Management, Strategy, and Governance 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]	Item 1C. Cybersecurity. Risk Management and Strategy As part of our overall approach to integrated risk management, we have established an information security program that includes policies, processes, and organizations to assess, identify and manage risk from information security threats, including cybersecurity threats, and including risks related to third parties, such as partners, vendors, and suppliers. The program also includes an incident response plan that is designed to provide controls and procedures for responding to cybersecurity or other security incidents. We have established an Information Security team that is responsible for overseeing the program across the Company, including with respect to information, personnel, and facilities. The Information Security team is led by our Chief Information Security Officer, or CISO, who coordinates with other departments in areas such as facilities, physical security, operations, data protection, information technology, product development, finance, legal and compliance. Regular assessments and reviews, through both internal and external experts, are conducted on OneStream information assets and networks, including systems, devices, applications, solutions and related computing resources, to evaluate potential risks and vulnerabilities, identify actions to be taken, and evaluate the effectiveness of our cybersecurity program. Risk management exercises occur regularly and in response to changes in Company operations, risk landscape, and threat actor activities, using tabletop exercises, threat modeling, risk forecasting, and other techniques to monitor and evaluate the sufficiency of our policies, processes and controls. Internal assessments occur based on results from risk management exercises, changes in infrastructure, cybersecurity risks, threat actor activity, and in response to other internal or external events. External assessments are conducted by third-party assessors, consultants or auditors, as relevant, and occur regularly in order to maintain our certifications and accreditations with certain compliance regimes (for example, FedRAMP). Additionally, the Company utilizes third-party software, services and providers in our cybersecurity program in furtherance of our security processes such as endpoint security, threat intelligence, cloud security, and authentication services. We also provide employees with policies and training in areas such as ethics, information security, social engineering, data protection, and compliance, and with regular updates on the cybersecurity program and potential threats. We are aware of the risks associated with engaging third-party service providers and other third parties. We have implemented risk-based processes to oversee and manage these risks, including, where appropriate, contractual requirements to implement technical, administrative, cybersecurity, and physical measures to protect the security and confidentiality of OneStream information (including customer information), and to notify the Company promptly of relevant security incidents. This approach is designed to mitigate risks related to data breaches or other security incidents originating from third parties. We face a number of cybersecurity risks in connection with our business. To date, our business, operating results and financial condition have not been materially affected by cybersecurity incidents. For additional information, please refer to Item 1A. “Risk Factors” in this Annual Report on Form 10-K, including the risk factors under the section titled “Risk Factors—Risks Related to our Technology and Intellectual Property.” Governance Management is responsible for the day-to-day management of risks we face, including risks related to cybersecurity. Primary responsibility for our cybersecurity program is assigned to our CISO, who joined OneStream in May 2017 and has served as our CISO since December 2020. He has over 28 years of cybersecurity experience in the commercial and government sectors and works directly with the Information Security team to oversee and implement our cybersecurity program, including the policies and processes described in “Risk Management and Strategy” above. Our CISO reports directly to our Chief Risk Officer, or CRO. The CISO and the CRO both participate in regular meetings of our Operations and Risk Committee, a management committee which monitors risks across the Company, including cybersecurity and other information security risks. Our board of directors, which has overall responsibility for enterprise risk management, has delegated to our audit committee primary oversight of cybersecurity risks and the processes to manage them. The audit committee regularly reviews and discusses with our CISO, CRO, and other senior management our policies and processes designed to identify, monitor and address enterprise risks, including risks from cybersecurity threats and incidents. Material cybersecurity threat risks are also considered during board of directors and audit committee meeting discussions of matters like enterprise risk management, operational budgeting, business continuity planning, and other relevant matters. In addition, at least annually, our board of directors discusses our programs and policies related to cybersecurity and considers them from a risk management perspective and as part of OneStream’s business strategy. As our Information Security team monitors the security and effectiveness of our policies and processes, they also work to keep the CISO, CRO and other members of leadership informed of critical incidents, process updates, or other material details, in accordance with our internal reporting structure. Depending on the nature and severity of an incident, this reporting structure provides for escalating notification to our CEO and the board of directors.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	As part of our overall approach to integrated risk management, we have established an information security program that includes policies, processes, and organizations to assess, identify and manage risk from information security threats, including cybersecurity threats, and including risks related to third parties, such as partners, vendors, and suppliers.
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]	Governance Management is responsible for the day-to-day management of risks we face, including risks related to cybersecurity. Primary responsibility for our cybersecurity program is assigned to our CISO, who joined OneStream in May 2017 and has served as our CISO since December 2020. He has over 28 years of cybersecurity experience in the commercial and government sectors and works directly with the Information Security team to oversee and implement our cybersecurity program, including the policies and processes described in “Risk Management and Strategy” above. Our CISO reports directly to our Chief Risk Officer, or CRO. The CISO and the CRO both participate in regular meetings of our Operations and Risk Committee, a management committee which monitors risks across the Company, including cybersecurity and other information security risks. Our board of directors, which has overall responsibility for enterprise risk management, has delegated to our audit committee primary oversight of cybersecurity risks and the processes to manage them. The audit committee regularly reviews and discusses with our CISO, CRO, and other senior management our policies and processes designed to identify, monitor and address enterprise risks, including risks from cybersecurity threats and incidents. Material cybersecurity threat risks are also considered during board of directors and audit committee meeting discussions of matters like enterprise risk management, operational budgeting, business continuity planning, and other relevant matters. In addition, at least annually, our board of directors discusses our programs and policies related to cybersecurity and considers them from a risk management perspective and as part of OneStream’s business strategy. As our Information Security team monitors the security and effectiveness of our policies and processes, they also work to keep the CISO, CRO and other members of leadership informed of critical incidents, process updates, or other material details, in accordance with our internal reporting structure. Depending on the nature and severity of an incident, this reporting structure provides for escalating notification to our CEO and the board of directors.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	Our board of directors, which has overall responsibility for enterprise risk management, has delegated to our audit committee primary oversight of cybersecurity risks and the processes to manage them.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	Our board of directors, which has overall responsibility for enterprise risk management, has delegated to our audit committee primary oversight of cybersecurity risks and the processes to manage them. The audit committee regularly reviews and discusses with our CISO, CRO, and other senior management our policies and processes designed to identify, monitor and address enterprise risks, including risks from cybersecurity threats and incidents. Material cybersecurity threat risks are also considered during board of directors and audit committee meeting discussions of matters like enterprise risk management, operational budgeting, business continuity planning, and other relevant matters. In addition, at least annually, our board of directors discusses our programs and policies related to cybersecurity and considers them from a risk management perspective and as part of OneStream’s business strategy.
Cybersecurity Risk Role of Management [Text Block]	Management is responsible for the day-to-day management of risks we face, including risks related to cybersecurity. Primary responsibility for our cybersecurity program is assigned to our CISO, who joined OneStream in May 2017 and has served as our CISO since December 2020. He has over 28 years of cybersecurity experience in the commercial and government sectors and works directly with the Information Security team to oversee and implement our cybersecurity program, including the policies and processes described in “Risk Management and Strategy” above. Our CISO reports directly to our Chief Risk Officer, or CRO. The CISO and the CRO both participate in regular meetings of our Operations and Risk Committee, a management committee which monitors risks across the Company, including cybersecurity and other information security risks. Our board of directors, which has overall responsibility for enterprise risk management, has delegated to our audit committee primary oversight of cybersecurity risks and the processes to manage them. The audit committee regularly reviews and discusses with our CISO, CRO, and other senior management our policies and processes designed to identify, monitor and address enterprise risks, including risks from cybersecurity threats and incidents. Material cybersecurity threat risks are also considered during board of directors and audit committee meeting discussions of matters like enterprise risk management, operational budgeting, business continuity planning, and other relevant matters. In addition, at least annually, our board of directors discusses our programs and policies related to cybersecurity and considers them from a risk management perspective and as part of OneStream’s business strategy.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Management is responsible for the day-to-day management of risks we face, including risks related to cybersecurity.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Primary responsibility for our cybersecurity program is assigned to our CISO, who joined OneStream in May 2017 and has served as our CISO since December 2020. He has over 28 years of cybersecurity experience in the commercial and government sectors and works directly with the Information Security team to oversee and implement our cybersecurity program, including the policies and processes described in “Risk Management and Strategy” above. Our CISO reports directly to our Chief Risk Officer, or CRO. The CISO and the CRO both participate in regular meetings of our Operations and Risk Committee, a management committee which monitors risks across the Company, including cybersecurity and other information security risks.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The CISO and the CRO both participate in regular meetings of our Operations and Risk Committee, a management committee which monitors risks across the Company, including cybersecurity and other information security risks.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Organization and Description of

Organization and Description of Business	12 Months Ended
	Dec. 31, 2024
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Organization and Description of Business	NOTE 1 – ORGANIZATION AND DESCRIPTION OF BUSINESS OneStream, Inc. (the Company or OneStream) was incorporated as a Delaware corporation on October 15, 2021 as a holding company for the purpose of facilitating an initial public offering (IPO) and other related transactions in order to carry on the business of OneStream Software LLC. OneStream Software LLC was formed in 2012 as a limited liability company (LLC) in the state of Michigan and converted to a state of Delaware LLC on February 5, 2019. OneStream delivers a unified, artificial intelligence-enabled and extensible software platform - the Digital Finance Cloud - that unifies core financial functions and broader operational data and processes within a single platform. OneStream’s customers are located throughout the world; however, they are primarily located in North America and Europe. OneStream is headquartered in Birmingham, Michigan and has international locations in Australia, Europe and Singapore. Initial Public Offering On July 25, 2024, the Company completed the IPO in which it sold 21,729,333 shares of its Class A common stock, par value $ 0.0001 per share, including the full exercise of the underwriters’ option to purchase additional shares, at a public offering price of $ 20.00 per share. The Company received net proceeds from the IPO of $ 409.6 million, net of underwriting discounts and commissions of $ 25.0 million, but before deducting offering expenses. The Co mpany used $ 352.9 million of the proceeds to purchase 18,723,296 newly issued common units (LLC Units) of OneStream Software LLC and $ 56.7 million of the proceeds to purchase 3,006,037 issued and outstanding LLC Units from certain members of OneStream Software LLC in a “synthetic secondary” transaction (the IPO Synthetic Secondary), in each case at a price per share equal to the IPO price to the public, net of underwriting discounts and commissions. Certain of the Company’s existing stockholders sold 6,445,667 shares of Class A common stock in the IPO at the public offering price of $ 20.00 per share. This sale included 5,986,437 shares of Class D common stock that were converted into an equal number of shares of Class A common stock and 459,230 shares of Class A common stock that were issued upon exercise of options granted to certain executive officers and other employees. The Company did not receive any proceeds from the sale of shares by the selling stockholders. Reorganization Transactions In connection with the IPO, the Company and OneStream Software LLC completed a series of organizational transactions (the Reorganization Transactions), including the following: • The amended and restated operating agreement of OneStream Software LLC was amended and restated (as further amended, the Amended LLC Agreement) to, among other things: (i) appoint the Company as the sole manager of OneStream Software LLC and (ii) effectuate the reclassification of all of the then-outstanding preferred units, common units and incentive compensation units (ICUs) of OneStream Software LLC into a single class of non-voting LLC Units. The then- outstanding preferred units and common units were reclassified into an equal number of LLC Units, and the 8,632,763 then-outstanding ICUs were reclassified into 6,591,178 LLC Units. • Certain pre-IPO members of OneStream Software LLC that were corporations merged with and into the Company (the Former Members) and contributed their LLC Units to the Company in exchange for shares of Class D common stock of the Company (the Blocker Mergers). • The certificate of incorporation of the Company was amended and restated to authorize additional shares of four series of common stock, Class A common stock, Class B common stock, Class C common stock and Class D common stock, and one class of preferred stock. The amended and restated certificate of incorporation and the Amended LLC Agreement require OneStream Software LLC and the Company to, at all times, maintain (i) a one-to-one ratio between the number of LLC Units owned by the Company and the number of shares of Class A common stock and Class D common stock outstanding and (ii) a one-to-one ratio between the number of shares of Class B common stock and Class C common stock owned by the members of OneStream Software LLC (the Continuing Members) and the number of LLC Units owned by the Continuing Members. As the sole manager of OneStream Software LLC, the Company controls all of the business operations, affairs, and management of OneStream Software LLC. Accordingly, the Company consolidates the financial results of OneStream Software LLC and reports the non-controlling interests of the Continuing Members’ LLC Units on its consolidated balance sheets. See Note 11 for information on the 2024 Equity Incentive Plan (the 2024 Plan) which became effective upon the IPO as well as the equity-based compensation charges recorded during the year ended December 31, 2024 in connection with the IPO.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Significant Accounting Policies	NOTE 2 – SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). The consolidated financial statements include the results of the Company and its wholly owned or controlled subsidiaries. As the Reorganization Transactions are considered transactions between entities under common control, the financial statements for periods prior to the IPO and Reorganization Transactions have been adjusted to combine the previously separate entities for presentation purposes. Prior to the Reorganization Transactions, OneStream, Inc. had no operations. All significant intercompany transactions and balances have been eliminated during consolidation. Use of Estimates The preparation of the Company’s consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and the accompanying footnotes. Management bases its estimates on historical experience and on various other market-specific and relevant assumptions that management believes to be reasonable under the circumstances. Actual results could differ materially from those estimates. Segment and Geographic Information The Company operates in one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is evaluated regularly by the chief operating decision maker (CODM), who, in the Company’s case, is the Chief Executive Officer (CEO), in deciding how to allocate resources and assessing performance. The Company’s CODM allocates resources and assesses performance based upon financial information on a consolidated basis, primarily using consolidated net income (loss) as the measure of profit or loss to make key operating decisions. Consolidated expense information, as presented on the consolidated statements of operations, is regularly provided to the CODM. Revenue by geographic region, based on the physical location of the customer, was as follows (in thousands): Year Ended December 31, 2024 2023 2022 United States $ 334,746 $ 262,855 $ 202,533 Other 154,661 112,066 76,791 Total revenue $ 489,407 $ 374,921 $ 279,324 No foreign country accounted for 10 % or more of revenue during the years ended December 31, 2024, 2023 and 2022. As of December 31, 2024 and 2023 , 90 % and 92 % of the Company’s property and equipment, net was in the United States and the remaining 10 % and 8 % was in foreign countries, respectively. Foreign Currency The functional currency of the Company’s foreign subsidiaries is primarily their respective local currency. The Company translates all assets and liabilities of foreign subsidiaries to U.S. dollars at the current exchange rate as of the applicable Consolidated Balance Sheet date. Revenue and expenses are translated at the average exchange rate prevailing during the period. The related unrealized gains and losses from foreign currency translation are recorded in accumulated other comprehensive loss as a component of stockholders’ / members’ equity. Foreign currency transaction gains and losses are included within other income (expense), net in the consolidated statements of operations. Cash and Cash Equivalents The Company considers all highly liquid investments with an original maturity of three months or less from the date of purchase to be cash equivalents. The Company’s cash equivalents generally consist of amounts invested in money market funds. Cash equivalents are stated at fair value. Fair Value Measurements The Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 820, Fair Value Measurements, requires entities to disclose the fair value of financial instruments, both assets and liabilities recognized and not recognized on the balance sheet, for which it is practicable to estimate fair value. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. ASC 820 describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, which are the following: Level 1: Quoted prices in active markets for identical or similar assets and liabilities. Level 2: Quoted prices for identical or similar assets and liabilities in markets that are not active or observable inputs other than quoted prices in active markets for identical or similar assets or liabilities. Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company’s financial instruments primarily include cash and cash equivalents, accounts receivable, accounts payable, and accrued expenses and other current liabilities. Cash and cash equivalents are stated at fair value using Level 1 inputs. The fair value of accounts receivable, accounts payable, and accrued expenses and other current liabilities approximate the carrying value because of their short-term nature. Concentration of Risk and Significant Customers Financial instruments that subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains its cash deposits with high-quality financial institutions with investment-grade ratings. The majority of the Company’s cash balances are with U.S. banks and are insured to the extent defined by the Federal Deposit Insurance Corporation (FDIC) and may, at times, exceed FDIC limits. No customer accounted for more than 10 % of total revenue for the years ended December 31, 2024, 2023 and 2022 , and no customer accounted for more than 10 % of total accounts receivable as of December 31, 2024 and 2023. The Company relies upon a limited number of third-party hosted cloud computing vendors to serve customers and operate certain aspects of its services, such as environments for production, and development usage. Given this, any disruption of or interference at the hosted infrastructure partners would impact the Company’s operations and the Company’s business could be adversely impacted. Property and Equipment Property and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation is computed using the straight‑line method over the estimated useful lives of the assets, which is generally three to seven years for furniture and equipment. The cost of leasehold improvements is depreciated over the lesser of the length of the related lease or seven years. Costs of maintenance and repairs are charged to expense as incurred. Capitalized Software Costs The Company capitalizes certain qualifying internal-use software costs. Qualifying costs are capitalized, and amortization begins when the software is ready for its intended use. The Company capitalized $ 0.9 mi llion, $ 1.2 million and $ 0.8 million of costs as internal-use software during the years ended December 31, 2024, 2023 and 2022, respectively. Capitalized software costs are amortized on a straight-line basis over the estimated useful life of the related software, which is generally three years. Amortization of internal-use software was $ 1.0 million for both the years ended December 31, 2024 and 2023, and $ 1.3 million for the year ended December 31, 2022. The Company has not capitalized any material ongoing costs of developing software products to be sold to third parties. Capitalization of development costs to be sold to third parties is required upon the establishment of technological feasibility of the product. New product versions are released on a regular basis, and the time between establishing technological feasibility and product release is very short. As a result, amounts that would qualify for capitalization have not been significant. Deferred Offering Costs Deferred offering costs consist primarily of accounting, legal, and other fees related to the Company’s IPO. During the year ended December 31, 2023, the Company abandoned its prior IPO preparations due to external market conditions and impaired $ 3.0 million of previously capitalized deferred offering costs. These costs were included in other income (expense) within the consolidated statement of operations for the year ended December 31, 2023. During the year ended December 31, 2024, the Company capitalized $ 7.2 million of offering costs related to the 2024 IPO, and after completion of the IPO, these costs were reclassified into stockholders’ equity as a reduction against the proceeds received from the IPO. Revenue Recognition Revenue related to contracts with customers is recognized in accordance with ASC 606, Revenue from Contracts with Customers. Revenue is recognized upon the transfer of control of promised products or services to customers in an amount that reflects the consideration the Company expects to receive in exchange for those products or services. Revenue is recognized net of any taxes collected from customers, which are subsequently remitted to governmental authorities. Contracts with customers are generally non-cancellable and consideration paid by the customer for software licenses and services received from the Company is non-refundable. As such, the Company does not estimate an allowance for refunds of services. Payment terms and conditions vary by contract type, although the Company’s terms generally include a requirement of payment within 30 to 60 days from the invoice date. In instances where the timing of revenue recognition differs from the timing of payment, the Company has determined that its contracts generally do not include a significant financing component. The primary purpose of the Company’s invoicing terms is to provide customers with simplified and predictable ways of purchasing the Company’s products and services, not to receive financing from its customers or to provide customers with financing, such as in the case of a multi-year term-based software license agreement that is invoiced annually with the software license revenue recognized upfront. The Company determines revenue recognition based on the following steps: 1. Identification of the contract, or contracts, with the customer 2. Identification of the performance obligations in the contract 3. Determination of the transaction price 4. Allocation of the transaction price to the performance obligations in the contract 5. Recognition of the revenue when, or as, a performance obligation is satisfied Subscription Revenue Subscription revenue consists of revenue from software-as-a-service (SaaS), post-contract customer support (PCS), and cloud computing. SaaS arrangements with customers provide the customer with continuous access to the Company’s hosted software platform over the contractual period. SaaS revenue is recognized ratably over the contract term beginning on the date access to the platform is provided, consistent with the transfer of control of the SaaS subscription to the customer. Cloud computing service fees are paid by those customers who choose to install and access their licensed software on a month-to-month subscription to a cloud hosting service offered by the Company, rather than manage it themselves. The Company’s performance obligation is to provide cloud computing services on a consumption basis during the contract term and the consideration received is based on customer consumption. The Company invoices and recognizes revenue for cloud computing services on a monthly basis as the service is utilized. PCS includes unspecified technical enhancements, customer support, and maintenance for licensed software. Revenue from PCS is recognized ratably over the contractual term of the arrangement, consistent with the pattern of benefit to the customer, beginning on the date the service is made available to the customer. License Revenue License revenue consists of license revenue from both the Company’s term-based and perpetual software licenses (collectively referred to herein as licensed software). The Company satisfies its performance obligation and recognizes revenue for licensed software at the point in time when the customer is able to use and benefit from the software, which is generally when it is first made available to the customer or upon commencement of the license term, if later. The typical length of a customer contract for term-based licensed software is three years and customers are generally invoiced in equal annual installments at the beginning of each year within the contractual period. Professional Services and Other Revenue Professional services and other revenue consist of fees associated with implementation and consulting services and training. Services do not result in significant customization of the software and are considered distinct. A substantial majority of the professional service contracts are provided on a time and materials basis and the related revenue is recognized as the service hours are performed. For time and materials projects, the Company invoices for services as the work is incurred. Contracts with Multiple Performance Obligations The Company has contracts with customers that contain multiple performance obligations that are distinct and are accounted for separately. For contracts with multiple performance obligations, such as licensed software sold with PCS, the transaction price is allocated to the separate performance obligations based on the relative stand‑alone selling price (SSP) of each distinct performance obligation. The Company estimates SSP at contract inception considering all information that is reasonably available and is based on the amount of consideration for which the Company expects to be entitled in exchange for transferring the promised good or service to the customer. Judgment is required to determine the SSP for each distinct performance obligation. In instances where the SSP is not directly observable because the Company does not sell the product or service separately, the Company estimates the SSP considering market conditions, historical pricing relationships, peer data, industry data for similar products, and other observable inputs. For licensed software, the Company determines the pricing relationship between the licensed software and PCS by maximizing the use of observable inputs, which attributes the majority of the contract value to the licensed software and a minority to PCS. Contract Modifications In limited situations, the Company enters into agreements to modify previously executed contracts, which constitute contract modifications. The Company assesses each of these contract modifications to determine (i) if the additional products and services are distinct from the products and services in the original arrangement; and (ii) if the amount of consideration expected for the added products and services reflects the stand-alone selling price of those products and services, as adjusted for contract-specific circumstances. A contract modification meeting both criteria is accounted for as a separate contract. A contract modification not meeting both criteria is considered a change to the original contract, which the Company accounts for on either: (i) a prospective basis as a termination of the existing contract and the creation of a new contract; or (ii) a cumulative catch-up basis. Generally, the Company’s contract modifications meet both criteria and are accounted for as a separate contract, as adjusted for contract-specific circumstances. Contract Balances Accounts receivable are recorded at the invoice amount, net of allowance for credit losses. A receivable is recorded in the period the Company delivers products or provides services, or when it has an unconditional right to payment. In multi-year agreements, the Company generally invoices customers in equal annual installments at the beginning of each year within the contractual period. The Company records a receivable for multi-year licensed software, whether or not billed, to the extent it has an unconditional right to receive payment in the future related to those licenses. The Company estimates the amount of uncollectible accounts receivable at the end of each reporting period and provides a reserve when needed based on an assessment of various factors including the aging of the receivable balance, historical experience, and expectations of forward-looking loss estimates. When developing the expectations of forward-looking loss estimates, the Company takes into consideration forecasts of future economic conditions, information about past events, such as historical trends of write-offs, and customer-specific circumstances, such as bankruptcies and disputes. Accounts receivable are written off when deemed uncollectible. Customer payment terms are typically net 30 to 60 days. As of December 31, 2024 and 2023 , the balance in the allowance for credit losses was $ 1.9 million and $ 1.2 million, respectively. T he Company recorded bad debt expense of $ 1.1 million, $ 1.6 million and $ 0.5 million for the years ended December 31, 2024, 2023 and 2022 respectively, which is presented in the consolidated statements of operations as general and administrative expenses. Deferred revenue consists of customer billings in advance of revenue being recognized. The Company primarily invoices its customers for SaaS arrangements, PCS, and term-based software licenses in equal annual installments at the beginning of each year within the contractual period, though certain contracts require invoicing for the entire arrangement in advance. Amounts anticipated to be recognized within one year of the balance sheet date are recorded on the consolidated balance sheets as deferred revenue, current; the remaining portion is recorded as deferred revenue, noncurrent. The balance of deferred revenue will fluctuate based on timing of invoices and recognition of revenue. The amount of revenue recognized during the years ended December 31, 2024 and 2023 that was included in deferred revenue at the beginning of each period was $ 178.4 million and $ 112.5 million, respectively. Transaction Price Allocated to Remaining Performance Obligations The transaction price allocated to remaining performance obligations represents contracted revenue that has not yet been recognized, which includes unearned revenue and unbilled amounts that will be recognized as revenue in future periods. The transaction price allocated to the remaining performance obligations is influenced by several factors, including seasonality, the timing of renewals, the timing of delivery of software licenses, average contract terms, and foreign currency exchange rates. Unbilled portions of the remaining performance obligations denominated in foreign currencies are revalued each period based on the period end exchange rates. Unbilled portions of the remaining performance obligations are subject to future economic risks including bankruptcies, regulatory changes, and other market factors. The aggregate amount of the transaction price allocated to remaining performance obligations as of December 31, 2024 was $ 1,103.9 million. The Company expects to recognize approximately 39 % of this amount as revenue in the next 12 months with the remaining balance recognized thereafter. Deferred Commissions The Company pays commissions for new sales of SaaS, cloud computing, and licensed software arrangements. Incremental sales commissions that are related to the acquisition of customer contracts are capitalized as deferred commissions on the consolidated balance sheets. The Company determines whether costs should be deferred based on whether the commissions are, in fact, incremental and would not have occurred absent the customer contract. The Company generally does not pay commissions for renewal contracts and therefore a portion of the commissions paid for new contracts relates to future renewals. Commissions incurred upon the acquisition of SaaS contracts are amortized over an estimated period of benefit of five years . Commissions incurred upon the acquisition of month-to-month cloud computing contracts are amortized over an estimated period of benefit of 12 months. Commissions incurred upon the initial acquisition of licensed software contracts are allocated in proportion to the allocation of the transaction price of the license and PCS performance obligations. Commissions allocated to the license are expensed at the time the license revenue is recognized, while commissions allocated to PCS are amortized over an estimated period of benefit of five years. Capitalized commission costs are recorded as deferred commissions on the consolidated balance sheets and amortized to sales and marketing in the consolidated statements of operations. The Company determines the period of benefit for commissions related to subscription sales by taking into consideration the historical initial and renewal contractual terms, estimated renewal rates, and the technological life of the platform and related significant features. The Company periodically reviews deferred commissions to determine whether events or changes in circumstances have occurred that could impact the period of benefit. There were no impairment losses recorded during the years ended December 31, 2024 and 2023. Cost of Revenues Cost of Subscription Revenue Cost of subscription revenue consists of costs related to cloud computing and supporting the Company’s customers. These expenses are primarily comprised of third-party direct server and cloud storage costs and employee costs related to providing software maintenance and customer support. Cost of Professional Services and Other Revenue Cost of professional services and other revenue primarily consist of expenses directly related to the implementation of the Company’s licensed software and costs to train the Company’s customers and partners. These expenses are primarily comprised of employee compensation costs related to implementation and training services. Business Combinations The Company accounts for acquisitions of entities that include inputs and processes and have the ability to create outputs as business combinations in accordance with FASB ASC 805, Business Combinations (ASC 805). Assets acquired and liabilities assumed, if any, are measured at their estimated fair values on the acquisition date. The excess of the purchase price over those fair values is recorded as goodwill. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the consolidated statements of operations. The determination of the fair value of identifiable assets requires management to make certain assumptions and estimates of, among other things, projected revenues and costs, future expected cash flows, and discount rates. Although the Company believes the assumptions and estimates it has made in the past have been reasonable and appropriate, these estimates are based on historical experience and information obtained from the management of the acquired companies and are inherently uncertain. Goodwill and Other Intangible Assets Goodwill represents the excess of purchase price over the fair value of net assets acquired in a business combination. The Company tests goodwill for impairment each year during the fourth quarter, or more frequently if an event occurs or circumstances change that could more-likely-than-not reduce the fair value of the Company’s sole reporting unit below its carrying value. To test for impairment, the Company first performs a qualitative assessment that evaluates various events and circumstances, such as macroeconomic conditions, industry and market conditions, cost factors, and relevant events and financial trends, that may impact a reporting unit’s fair value. Using this qualitative assessment, the Company determines whether it is more-likely-than-not the reporting unit’s fair value exceeds its carrying value. If it is determined that it is not more-likely-than-not the reporting unit’s fair value exceeds the carrying value, or upon consideration of other factors, including recent acquisition, restructuring or disposal activity, or to refresh the fair values, the Company performs a quantitative goodwill impairment analysis. No goodwill impairment has been recognized in any period presented. Other intangible assets consists of acquired developed technology, which the Company amortizes on a straight-line basis over the estimated useful life and reviews for impairment when warranted by changes in circumstance. No impairment of other intangible assets has been recognized in any period presented. Non-controlling Interests Following the Reorganization Transactions, the Company consolidates the financial results of OneStream Software LLC. Therefore, the Company reports a non-controlling interest based on the LLC Units owned by the Continuing Members on the consolidated balance sheets. Net income (loss) attributed to the non-controlling interests is based on the weighted average LLC Units outstanding during the period, excluding LLC Units that are subject to vesting conditions, and is presented on the consolidated statements of operations and comprehensive loss. Refer to Note 10, Non-controlling Interests, for further details. Equity-based Compensation The Company has issued equity-based awards to employees in the form of restricted stock units (RSUs) and stock options, and, prior to the Reorganization Transactions, OneStream Software LLC issued ICUs and common unit options, as described in Note 11. The Company accounts for equity-based awards based on their grant date fair values. Determining the grant date fair values of equity-based awards may require management to make assumptions and judgments. These assumptions reflect the Company’s best estimates, but they involve inherent uncertainties based on market conditions. As a result, if other assumptions are used, equity-based compensation costs could be materially impacted. Equity-based compensation expense is recognized on a straight-line basis for awards with service-only vesting conditions, whereas awards with performance conditions are recognized using the accelerated attribution method. Forfeitures are accounted for as they occur. Refer to Note 11, Equity-based Compensation, for further details on the Company’s equity-based compensation awards. Net Loss per Share Net loss per share is computed by dividing net loss attributable to OneStream, Inc. for the period following the IPO and Reorganization Transactions by the weighted-average number of shares of Class A common stock and Class D common stock outstanding during the same period. Diluted net loss per share is computed by giving effect to potential weighted-average dilutive shares for the period following the Reorganization Transactions, including additional shares of Class D common stock issuable upon redemption of LLC Units held by Continuing Members. For the period following the Reorganization Transactions through December 31, 2024, 70,574 LLC Units were considered potentially dilutive and have been included in the calculation of dilutive net loss per share. All losses and earnings for the period prior to the IPO were entirely allocable to OneStream Software LLC. Due to the impact of the Reorganization Transactions, the Company’s capital structure for the pre- and post-IPO periods is not comparable. As a result, the presentation of net (loss) income per share for the periods prior to the IPO and Reorganization Transactions is not meaningful and only net loss per share for periods subsequent to the IPO and Reorganization Transactions are presented herein. Research and Development Research and development costs are expensed as incurred. Research and development costs consist primarily of employee compensation related costs associated with new product development and enhancements to existing software products. Advertising Costs Advertising costs are expensed as incurred and recorded in the consolidated statements of operations as sales and marketing expense. The Company recorded advertising costs of $ 2.4 million , $ 1.6 million and $ 4.3 million for the years ended December 31, 2024, 2023 and 2022 , respectively. Leases The Company determines if an arrangement is a lease at contract inception. Leases arise from contracts that convey the right to control the use of identified property or equipment for a period of time in exchange for consideration. Leases are classified at commencement as either operating or finance leases. As of December 31, 2024 and 2023, all of the Company’s leases were classified as operating leases. Rent expense for operating leases is recognized on a straight-line basis over the lease term beginning on the lease commencement date. Right-of-use (ROU) assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. In determining the present value of lease payments, the Company uses its secured incremental borrowing rate (IBR) based on the information available at the lease commencement date, including the lease term. In determining the appropriate IBR, the Company considers information including, but not limited to, the lease term and the currency in which the arrangement is denominated. The Company’s lease agreements may contain options to extend or terminate the lease. Such options are included in the lease term when they are considered reasonably certain to be exercised. ROU assets are subject to evaluation for impairment or disposal on a basis consistent with other long-lived assets. The Company’s lease agreements do not contain any material variable lease payments, any material residual value guarantees, or any material restrictions or covenants. Any leases with an initial term of 12 months or less are not recorded on the consolidated balance sheet. Income Taxes The Company follows the asset and liability method of accounting for income taxes under ASC 740, Income Taxes. Deferred income taxes are recognized by applying the enacted tax rates expected to be in effect in future years to the differences between financial statement carrying amounts of existing assets and liabilities and their respective tax bases as well as net operating losses and tax credit carryforwards. The measurement of deferred tax assets is reduced by a valuation allowance when it is more likely than not that some portion of the deferred tax assets will not be realized. For the tax benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities based on the technical merits of the position. For such positions, the largest benefit that has a greater than 50% likelihood of being realized upon settlement is recognized in the Company’s consolidated financial statements. The Company has elected to record future penalties and interest related to income taxes within its income tax provision. The Company has not incurred any significant interest or penalties related to income taxes in any of the periods presented. JOBS Act Accounting Election The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups (JOBS) Act of 2012. The JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. This provision allows an emerging growth company to delay the adoption of some accounting standards until those standards would otherwise apply to private companies. The Company has elected to use the extended transition period under the JOBS Act for the adoption of certain accounting standards until the earlier of the date the Company (i) is no longer an emerging growth company or

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2024
Business Combinations [Abstract]
Business Combinations	NOTE 3 – BUSINESS COMBINATIONS DataSense Acquisition On May 1, 2024 (the acquisition date), the Company entered into a membership interest purchase agreement with a related party, DataSense LLC (DataSense), and its sole equity holder, DataSense Holdings LLC (DataSense Holdings), a holding company established by the founders of DataSense, pursuant to which the Company acquired the remaining issued and outstanding membership interests of DataSense not previously owned by the Company. The acquisition allows the Company to continue its focus on building artificial intelligence (AI) and machine learning capabilities and continue the Company’s development of AI-enabled solutions. These capabilities increase the value proposition of the Digital Finance Cloud to the Company’s existing customers and further differentiates the Company from its competitors. The aggregate consideration under the purchase agreement consisted of $ 7.7 million in cash, including $ 0.5 million deposited into a post-closing escrow account, and 1,023,720 common units of OneStream Software LLC (common units), of which 1,009,302 are subject to performance-based vesting conditions measured on an annual basis over four years and service-based conditions tied to the continued employment of the founders of DataSense with the Company. In connection with the Reorganization Transactions, the common units awarded to the founders of DataSense were reclassified into an equal number of LLC Units and DataSense Holdings received an equal number of shares of Class C common stock. All Class C common stock and LLC Units issued as a result of the reclassification of unvested common units remain subject to the same vesting conditions that existed prior to the Reorganization Transactions; refer to Note 11 for further details. As part of the total consideration transferred, the Company also paid seller transaction costs of $ 0.3 million. As of the acquisition date , DataSense became a wholly owned subsidiary of the Company and its operations have been included in the Company’s consolidated financial statements. The Company accounted for the acquisition of the remaining equity interests of DataSense using the acquisition method of accounting in accordance with FASB ASC 805, Business Combinations. As part of the acquisition, the Company derecognized its previously held equity interest in DataSense, which had been accounted for as an equity method investment and was recorded in other noncurrent assets in the amount of $ 0.8 million as of the acquisition date. In assessing the fair value of its previously held equity interest as of the acquisition date, the Company, with the assistance of a third-party valuation provider, determined the fair value was $ 3.2 million as of the acquisition date, resulting in a gain of $ 2.4 million recorded in other income, net in the consolidated statement of operations for the year ended December 31, 2024. The following table summarizes the total consideration transferred (in thousands): May 1, 2024 Cash $ 7,159 Amounts deposited into escrow 500 Fair value of equity consideration 243 Seller transaction costs paid by the Company 298 Settlement of payables existing prior to the acquisition ( 920 ) Fair value of previously held ownership interest 3,229 Total consideration $ 10,509 The purchase price was allocated on a preliminary basis as of the acquisition date. Assets acquired and liabilities assumed were recorded at estimated fair values based on management’s estimates, available information, and supportable assumptions that management considered reasonable. The Company expects to finalize the valuation as soon as practicable, but no later than one year from the acquisition date. The following table summarizes the allocation of the total purchase price based upon the fair value of assets acquired and liabilities assumed as of the acquisition date, inclusive of measurement period adjustments (in thousands): May 1, 2024 Cash $ 363 Intangible assets – developed technology 3,300 Prepaid expenses and other current assets 20 Goodwill 9,280 Other accrued expenses and current liabilities ( 2,454 ) Total consideration $ 10,509 The excess of the purchase price over the estimated fair value of net assets was recognized as goodwill. Goodwill consists of the Company’s expected future economic benefits that will arise from expected future operational synergies from combining DataSense with its existing business. The total amount of tax deductible goodwill is $ 3.6 million, which is amortized over 180 months. Goodwill and identifiable intangible assets were valued using the income approach. Management used a third-party valuation firm to assist in the determination of the preliminary purchase accounting fair values; however, management ultimately oversees the third-party valuation firm to ensure that the transaction-specific assumptions are appropriate for the Company. The operating results of DataSense from the date of acquisition, which are not material, have been included in the Company’s consolidated statements of operations. Acquisition-related costs incurred were not material for the year ended December 31, 2024 . All acquisition-related costs were expensed as incurred and have been recorded in general and administrative expenses in the accompanying consolidated statements of operations.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	NOTE 4 – GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill The carrying amount of goodwill as of December 31, 2024 was $ 9.3 million. The only addition to goodwill during the year was related to the acquisition of DataSense, as described in Note 3. Other Intangible Assets The Company’s acquired intangible assets had a gross carrying value of $ 3.3 million and accumulated amortization of $ 0.7 million as of December 31, 2024 . The Company recorded amortization of other intangible assets of $ 0.7 million for the year ended December 31, 2024 . There was no amortization expense recorded in the years ended December 31, 2023 or 2022. The weighted-average remaining useful life of the Company’s acquired intangible assets is 2.3 years as of December 31, 2024. As of December 31, 2024, the estimated aggregate amortization expense for intangible assets for each of the five succeeding fiscal years was as follows (in thousands): Fiscal Year: 2025 $ 1,100 2026 1,100 2027 367 2028 — 2029 — Total expected amortization expense $ 2,567

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Property and Equipment	NOTE 5 – PROPERTY AND EQUIPMENT The Company’s property and equipment, net consisted of the following (in thousands): As of December 31, 2024 2023 Leasehold improvements $ 9,038 $ 7,566 Capitalized software costs 5,264 4,172 Furniture and equipment 3,767 3,265 Construction in progress 244 583 Gross property and equipment 18,313 15,586 Less: Accumulated depreciation and amortization ( 8,229 ) ( 5,320 ) Property and equipment, net $ 10,084 $ 10,266 Depreciation and amortization expense was $ 2.9 million for both the years ended December 31, 2024 and 2023 , and $ 2.7 million for the year ended December 31, 2022 .

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 6 – COMMITMENTS AND CONTINGENCIES Commitments The Company leases office space under non-cancelable operating leases with various expiration dates from 2024 to 2034. The following lease costs were included in the consolidated statements of operations and comprehensive loss (in thousands): Year Ended December 31, 2024 2023 Operating lease cost $ 3,855 $ 3,560 Short-term lease cost 474 731 Variable lease cost 1,442 976 Total lease cost $ 5,771 $ 5,267 Supplemental information relating to operating leases is presented below: Year Ended December 31, 2024 2023 Cash paid for operating lease liabilities (in thousands) $ 3,747 $ 3,001 Weighted-average remaining lease term (in years) 6.72 7.53 Weighted-average discount rate 4.6 % 4.3 % The Company’s future minimum commitments under leases, service agreements, and other contractual commitments as of December 31, 2024 is as follows (in thousands): Operating Future Years ending December 31, 2025 $ 4,149 $ 22,780 2026 3,729 6,524 2027 2,583 105 2028 2,467 107 2029 2,373 — 2030 and thereafter 6,512 — Total payments 21,813 $ 29,516 Less: imputed interest ( 3,057 ) Less: leases less than 12 months ( 162 ) Total lease liabilities $ 18,594 In June 2022, the Company entered into a five-year consumption agreement with a vendor whereby the Company committed to purchase $ 300.0 million of data center, cloud, and IT services with no minimum annual spending requirement (excluded from the table above). In November 2024, the agreement was amended to increase the existing purchase commitment from $ 300.0 million to $ 360.0 million. As of December 31, 2024 , the total remaining commitment under this agreement was $ 227.2 million. Guarantees and Indemnifications The Company’s cloud computing and licensed software sales agreements normally include indemnification provisions for customer liabilities resulting from third party claims that its products infringe third party intellectual property rights. To date, the Company has not incurred any material costs as a result of such indemnifications and has not accrued any liabilities related to such obligations in its consolidated financial statements. Certain of the Company’s sales agreements also include indemnification provisions for customer liabilities incurred as a result of a breach of confidentiality. The Company’s cloud computing service provider indemnifies the Company for up to 24 months of fees for data breaches. It is not possible to determine the maximum potential amount under these indemnification agreements due to the limited and infrequent history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement. The Company includes service level commitments to its customers, typically regarding certain levels of uptime reliability and performance, and if the Company fails to meet those levels, customers can receive credits and, in limited cases, terminate their relationship with the Company. To date, the Company has not incurred any material costs as a result of such commitments. The Company is occasionally required, for various reasons, to enter into financial guarantees with third parties in the ordinary course of business including, among others, guarantees related to letters of credit on behalf of parties with whom it conducts business. Such agreements have not had a material effect on the Company’s consolidated financial statements. The Company has also agreed to indemnify its board of directors and executive officers for costs associated with any fees, expenses, judgments, fines, and settlement amounts incurred by any of these persons in any action or proceeding to which any of those persons is, or is threatened to be, made a party by reason of the person’s service as a board member or officer, including any action by the Company, arising out of that person’s services as the Company’s board member or officer or that person’s services provided to any other company or enterprise at the Company’s request. The Company has maintained board member and officer insurance coverage that would generally enable the Company to recover a portion of any future amounts paid. The Company may also be subject to indemnification obligations by law with respect to the actions of its employees under certain circumstances and in certain jurisdictions.

Debt

Debt	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Debt	NOTE 7 – DEBT Revolving Credit Facility In January 2020, the Company entered into a revolving credit facility with a bank that allowed the Company to borrow up to $ 50.0 million for working capital and for other general corporate purposes through December 31, 2024, with an option to request an increase in available borrowings by an additional $ 25.0 million. In October 2023, the Company entered into an amended and restated revolving credit facility (the Credit Facility) that established a syndicate including two additional banks, increased the borrowing capacity from $ 50.0 million to $ 150.0 million, and extended the maturity date of the Credit Facility to October 27, 2028 . In connection with the amendment and restatement, the Company incurred $ 0.5 million of financing costs which have been recorded as other noncurrent assets in the consolidated balance sheet. The Company did not have any amounts drawn under the Credit Facility in any period presented. Under the terms of the Credit Facility, the Company has the option to borrow funds as either a secured overnight financing rate (SOFR) loan or alternate base rate (ABR) loan. Any advances drawn on the Credit Facility incur interest at an annual rate equal to the SOFR plus 250 basis points for SOFR loans and ABR plus 150 basis points for ABR loans. The SOFR is defined as, for any day, a rate per annum equal to SOFR for the day (such day, the SOFR Determination Date) that is five (5) U.S. Government Securities Business Day prior to (i) if such SOFR rate day is a U.S. Government Securities Business Day, such SOFR Rate Day or (ii) if such SOFR rate day is not a U.S. Government Securities Business Day, the U.S. Government Securities Business Day immediately preceding such SOFR rate day, in each case, as such SOFR is published by the SOFR Administrator on the SOFR Administrator’s Website. The ABR is defined as, for any day, a rate per annum equal to the greatest of (a) the prime rate in effect on such day, (b) the Federal Reserve Bank of New York (NYFRB) rate in effect on such day plus ½ of 1% and (c) Term SOFR for a one month interest period on such day (or if such day is not a Business Day, the immediately preceding business day) plus 1%. Any undrawn portion of the Credit Facility is subject to a fee of 0.25 % per annum. SOFR interest payments for interest periods of 3 months or less are due at the end of the interest period. SOFR interest payments for interest periods greater than 3 months are due on 3-month intervals following the borrowing. ABR interest and fees are payable quarterly in arrears with the principal and any accrued and unpaid interest due on October 27, 2028. Interest expense on the Credit Facility is recorded in the consolidated statements of operations as interest expense, net and fees are recorded as general and administrative expenses. Interest expense and fees on the Credit Facility were not material during the years ended December 31, 2024, 2023 and 2022. Under the terms of the Credit Facility, the Company must maintain compliance with certain negative and affirmative covenants, including financial covenants and covenants relating to the incurrence of other indebtedness, the occurrence of a material adverse change, the disposition of assets, mergers, acquisitions and investments, the granting of liens, and the payment of dividends. The Company must also not permit the ratio of indebtedness to total recurring revenue for the most recent trailing four quarters to exceed 0.50 to 1.00 , and is required to maintain $ 50.0 million in liquidity. The Credit Facility is secured by substantially all the assets of the Company. The Company was compliant with the financial covenants contained in the agreement as of December 31, 2024 .

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 8 – INCOME TAXES Prior to the Reorganization Transactions and IPO, the Company was treated as a partnership for U.S. income tax purposes. As of the IPO, the Company is treated as a corporation for income tax purposes and is subject to federal, state, local, and foreign taxes with respect to allocable share of any net taxable income from OneStream Software LLC. OneStream Software LLC is a limited liability company treated as a partnership for income tax purposes and its taxable income or loss is passed through to its members, including the Company. OneStream Software LLC’s foreign subsidiaries are taxed in the foreign jurisdictions in which they operate, and accruals for such taxes are included in the Company’s consolidated financial statements. For the periods presented prior to the Reorganization Transactions and IPO, the reported income taxes represent those of OneStream Software LLC. The components of the Company’s loss before income taxes were as follows (in thousands): Year Ended December 31, 2024 2023 2022 Domestic $ ( 286,591 ) $ ( 32,744 ) $ ( 68,048 ) Foreign ( 18,191 ) 5,229 3,241 Loss before income taxes $ ( 304,782 ) $ ( 27,515 ) $ ( 64,807 ) The provision for income taxes consisted of the following (in thousands): Year Ended December 31, 2024 2023 2022 Current: U.S. federal $ — $ — $ — State 126 70 3 Foreign 1,751 1,346 656 Total current $ 1,877 $ 1,416 $ 659 Deferred: U.S. Federal — — — State — — — Foreign — — — Total deferred $ — $ — $ — Provision for income taxes $ 1,877 $ 1,416 $ 659 A reconciliation of the income tax provision at the U.S. federal statutory rate to the Company’s provision for income taxes was as follows: Year Ended December 31, 2024 2023 2022 U.S. federal benefit at federal statutory rate ( 64,004 ) ( 5,778 ) ( 13,609 ) Increase (decrease) in rate resulting from: Valuation allowance 52,410 — — Loss allocable to non-controlling interest 17,763 — — Permanent items 1,015 405 — Withholding taxes 103 — — Flow-through income — 6,876 14,291 Foreign expense (benefit) differential ( 752 ) ( 206 ) ( 26 ) State taxes, net of federal tax benefit ( 5,264 ) 119 3 Other 606 — — Provision for income taxes $ 1,877 $ 1,416 $ 659 The U.S. federal income tax rate for the years ended December 31, 2024, 2023 and 2022 was 21 %. The Tax Cuts and Jobs Act subjects a U.S. shareholder to current tax on global intangible low-taxed income (GILTI) earned by certain foreign subsidiaries. The Company has made an accounting policy election to treat taxes due under the GILTI provision as a current period expense. The impact of GILTI resulted in no incremental tax expense for the year ended December 31, 2024 due to a full valuation allowance on U.S. net deferred tax assets. Deferred Income Taxes The components of the Company’s deferred tax assets and liabilities were as follows: Year Ended December 31, 2024 Deferred tax assets Net operating loss carryforwards $ 46,491 Investment in partnership 172,693 Equity-based compensation 5,261 Capital loss carryforward 2,508 Lease liabilities 1,518 Other 275 Gross deferred tax assets 228,746 Valuation allowance ( 227,225 ) Deferred tax assets, net of valuation allowance 1,521 Deferred tax liabilities Right-of-use assets ( 1,518 ) Other ( 3 ) Total deferred tax liabilities $ ( 1,521 ) Net deferred tax assets $ — For the year ended December 31, 2023, all deferred tax assets and liabilities above were immaterial. The Company recognizes deferred tax assets to the extent it believes that these assets are more likely than not to be realized. The realization of tax benefits of net deferred tax assets is dependent upon future levels of taxable income, of an appropriate character, in the periods the items are expected to be deductible or taxable. The Company has recorded deferred tax assets of $ 44.1 million and $ 2.4 million for federal and state jurisdictions, respectively, as discussed further below. The Company has a deferred tax asset related to a prior year capital loss carryforward which expires in 2028 . The Company also has a deferred tax asset of $ 172.7 million related to its outside basis difference in its investment in OneStream Software LLC. The Company has considered the consolidated historical pre-tax losses as well as the four sources of income in determining the need for a valuation allowance when the realization of its deferred tax assets is not more likely than not. The four sources of taxable income considered are (1) taxable income in prior carryback years where carryback is allowable, (2) future reversals of existing temporary differences, (3) consideration of reasonable and prudent tax planning strategies, and (4) forecasts of future taxable income, exclusive of reversing temporary differences and carryforwards. Based on the available evidence as of December 31, 2024, the Company believes that it is not more likely than not that the U.S. and foreign deferred tax assets will be realized. Accordingly, the Company has recorded a full valuation allowance against the U.S. and foreign deferred tax assets. The Company intends to maintain the valuation allowance on the U.S. and foreign net deferred tax assets until sufficient positive evidence exists to support a reversal of, or decrease in, the valuation allowance. As of December 31, 2024, the Company had U.S. federal income tax net operating loss carryforwards of $ 209.8 million available to offset future taxable income, all of which will be carried forward indefinitely, but utilization is limited to 80 % of taxable income in any given year. The Company also has state net operating loss carryforwards of $ 47.4 million which begin to expire in 2029 . IRC Section 382 imposes limitations on a corporation’s ability to utilize its net operating loss carryforwards if the corporation experiences an ownership change, as defined in Section 382. Based upon an analysis performed, the current IRC Section 382 limitation does not have a significant impact on the Company’s future utilization of the U.S. federal net operating loss carryforwards. In the event of future changes in ownership, the utilization of net operating loss carryforwards could be limited. The Company had no significant uncertain tax positions as of December 31, 2024 and 2023. The Company did no t incur any interest or penalties related to income taxes during the years ended December 31, 2024, 2023 and 2022. The Company does not anticipate that any unrecognized tax benefits will significantly increase within the next 12 months. The Company is not currently under audit in the area of income tax in any jurisdiction. As of December 31, 2024, tax years 2021 and forward are subject to examination in federal and state jurisdictions, with certain exceptions for state and foreign jurisdictions with longer statute of limitation periods. The Organization for Economic Co-operation and Development (OECD) announced the Inclusive Framework on Base Erosion Profit Sharing (Framework) which agreed to a two pillar solution to address tax challenges arising from digitalization of the global economy. Under Pillar Two, the Framework provides for a global minimum tax rate of 15 %, calculated on a jurisdiction-by-jurisdiction basis. The Framework must now be implemented by the OECD members who have agreed to the plan, effective in 2024. Numerous countries have enacted legislation to adopt the Framework with a subset of the rules effective January 1, 2024, and the remaining rules effective January 1, 2025, or in later periods. The Company does not anticipate the Framework will have a material impact on its financial statements, largely driven by not meeting the revenue threshold of 750 million Euro for Pillar Two to apply. The Company will continue to evaluate and monitor this position as further guidance is made available, including refining its analysis as appropriate. The Company previously considered the earnings in its foreign subsidiaries as not indefinitely reinvested. No deferred taxes were recorded for the year ended December 31, 2023 as the earnings were insignificant. However, during the year ended December 31, 2024, the Company determined the earnings of its foreign subsidiaries to be indefinitely reinvested as of year ended December 31, 2024. As such, the Company has made no provision for foreign or domestic income taxes on the cumulative unremitted earnings of its foreign subsidiaries. The Company’s change in its permanent reinvestment assertion during the year ended December 31, 2024 did not have a material impact on the consolidated financial statements. If the Company repatriated its accumulated foreign earnings, the amounts of taxes which the Company could be subject to are not material to the consolidated financial statements. Tax Receivable Agreement In connection with the Reorganization Transactions, the Company entered into a Tax Receivable Agreement (TRA) with OneStream Software LLC, KKR and other Continuing Members, and certain Former Members. Under the TRA, the Company will retain 15 % of certain available tax savings and will be required to pay KKR and the other Continuing Members, and certain Former Members, the remaining 85 % of such tax savings, if any, that are realized or deemed realized as a result of tax attributes, i.e. deferred tax assets. The amounts of any tax benefit to the Company that arises from future exchanges or redemptions of LLC Units will vary depending on a number of factors, including, but not limited to, the timing of any future redemptions or exchanges and the price of shares of its Class A common stock at the time of such future redemption or exchange. The Company will only recognize a deferred tax asset for financial reporting purposes when it is “more-likely-than-not” that the tax benefit will be realized. Based on the Company’s assessment, it is not more likely than not that the Company will realize the tax benefit of any deferred tax asset resulting from the Reorganization Transactions and subsequent LLC Unit exchanges and redemptions, and therefore, the Company has established a full valuation against its U.S. deferred tax asset. As such, no TRA liability has been recorded in the consolidated financial statements as of December 31, 2024. Had the tax benefit been more likely than not to be realized, the estimated TRA liability that could result from past exchanges would have been approximately $ 136.6 million as of December 31, 2024.

Stockholders' _ Members' Equity

Stockholders' / Members' Equity	12 Months Ended
	Dec. 31, 2024
OneStream, Inc
Class of Stock [Line Items]
Stockholders' / Members' Equity	NOTE 9 – STOCKHOLDERS’ / MEMBERS’ EQUITY Amendment and Restatement of Certificate of Incorporation In connection with the Reorganization Transactions, the certificate of incorporation of OneStream, Inc. was amended and restated to, among other things, provide for the authorization of (i) 2,500,000,000 shares of Class A common stock with a par value of $ 0.0001 per share, (ii) 300,000,000 shares of Class B common stock with a par value of $ 0.0001 per share, (iii) 300,000,000 shares of Class C common stock with a par value of $ 0.0001 per share, (iv) 600,000,000 shares of Class D common stock with a par value of $ 0.0001 per share, and (v) 100,000,000 shares of preferred stock with a par value of $ 0.0001 per share. The rights of the holders of Class A common stock, Class B common stock, Class C common stock and Class D common stock are identical, except with respect to voting rights, conversion rights and economic rights. Each share of Class A common stock is entitled to one vote per share and has economic rights. Each share of Class B common stock is entitled to one vote per share, is cancellable upon the redemption or exchange of one LLC Unit for cash or one share of Class A common stock and has no economic rights. Each share of Class C common stock is entitled to ten votes per share, is cancellable upon the redemption or exchange of one LLC Unit for cash or one share of Class D common stock, is convertible into one share of Class B common stock, and has no economic rights. Each share of Class D common stock is entitled to ten votes per share, is convertible into one share of Class A common stock and has economic rights. Recapitalization of OneStream Software LLC In connection with the Reorganization Transactions and the Amended LLC Agreement, all membership interests in OneStream Software LLC were reclassified into a single-class of LLC Units. The following is a summary of the securities reclassified in connection with the Reorganization Transactions: • 80,324,378 common units of OneStream Software LLC outstanding prior to the Reorganization Transactions were reclassified on a one -for-one basis into LLC Units; • 128,293,508 convertible preferred units of OneStream Software LLC outstanding prior to the Reorganization Transactions were reclassified on a one -for-one basis into LLC Units; and • 8,632,763 ICUs of OneStream Software LLC outstanding prior to the Reorganization Transactions were reclassified into 6,591,178 LLC Units. In addition, the Company issued 74,135,230 shares of Class C common stock, net of 3,006,037 shares of Class C common stock purchased and cancelled in the IPO Synthetic Secondary, to the Continuing Members. The Company also issued 132,081,358 shares of Class D common stock, net of the conversion of 5,986,437 shares of Class D common stock to Class A common stock in connection with the sale of such shares in the IPO, to the Former Members in exchange for LLC Units on a one-for-one basis. The amended and restated certificate of incorporation and the Amended LLC Agreement discussed above require the Company and OneStream Software LLC to, at all times, maintain (i) a one -to-one ratio between the number of shares of Class A common stock and Class D common stock outstanding and the number of LLC Units owned by the Company and (ii) a one -to-one ratio between the number of shares of Class B common stock and Class C common stock outstanding and the number of LLC Units owned by the Continuing Members. Preferred Stock As of December 31, 2024 , there are no shares of preferred stock outstanding. Under the terms of the Company’s amended and restated certificate of incorporation, the board of directors is authorized to direct the Company to issue shares of preferred stock in one or more series without shareholder approval. The board of directors has the discretion to determine the rights, preferences, privileges, and restrictions, including dividend rights, dividend rates, conversion rights, exchange rights, voting rights, redemption privileges and liquidation preferences, of each series of preferred stock. Secondary Offering In November 2024, the Company completed a secondary offering (the Secondary Offering) of 17,250,000 shares of its Class A common stock, including the full exercise of the underwriters’ option to purchase additional shares, of which 10,357,991 shares were sold by selling stockholders and 6,892,009 shares were sold by the Company as part of a non-dilutive “synthetic secondary” transaction (the Secondary Offering Synthetic Secondary), in each case at a public offering price of $ 31.00 per share. In connection with the Secondary Offering, certain selling stockholders (i) redeemed 472,940 issued and outstanding LLC Units (and a corresponding number of their shares of Class C common stock were cancelled) in exchange for an equal number of shares of Class D common stock and (ii) converted 10,357,991 shares of Class D common stock (inclusive of the 472,940 shares of Class D common stock acquired upon the redemption of LLC Units described in the preceding clause) into an equal number of shares of Class A common stock. The Company did not retain any proceeds from the Secondary Offering and, upon its closing, the total number of outstanding shares of common stock of OneStream Inc. and LLC Units of OneStream Software LLC remained the same. The Company used all of the net proceeds from the Secondary Offering, all received as part of the Secondary Offering Synthetic Secondary, to purchase issued and outstanding LLC Units (and purchase and cancel an equal number of shares of then outstanding Class C common stock) from KKR Dream Holdings LLC. In connection with the Secondary Offering, the Company incurred $ 1.3 million of costs during the year ended December 31, 2024, which were recorded in general and administrative expenses in the Company’s consolidated statement of operations. Exchanges and Redemptions of LLC Units In December 2024, separate from the exchanges and redemptions in connection with the Secondary Offering, certain Continuing Members redeemed 2,840,662 LLC Units, along with their corresponding shares of Class C common stock, in exchange for an equal number of shares of Class D common stock, which were all subsequently converted into Class A common stock. Simultaneously, and in connection with these exchanges and redemptions, the Company cancelled the exchanged shares of Class C common stock.

Non-controlling Interests

Non-controlling Interests	12 Months Ended
	Dec. 31, 2024
Noncontrolling Interest [Abstract]
Non-controlling Interests	NOTE 10 – NON-CONTROLLING INTERESTS In connection with the Reorganization Transactions, OneStream, Inc. became the sole manager of OneStream Software LLC and accordingly consolidates the results of operations of OneStream Software LLC. The non-controlling interests balance on the Company’s consolidated balance sheets represents the portion of LLC Units owned by the Continuing Members. Net (loss) income is attributed to the non-controlling interests based on the weighted-average ownership percentages of LLC Units outstanding during the period, excluding LLC Units that are subject to vesting conditions. As of December 31, 2024 , the non-controlling interests in OneStream Software LLC owned 26.6 % with the remaining 73.4 % owned by OneStream, Inc. The ownership of the LLC Units is summarized as follows: Ownership Ownership Percentage OneStream, Inc. Continuing Members (1) Total OneStream, Inc. Continuing Members (1) Total Balances at July 24, 2024 160,256,358 72,884,529 233,140,887 68.7 % 31.3 % 100.0 % Effects of Secondary Offering 7,364,949 ( 7,364,949 ) — 3.2 % ( 3.2 )% — Effect of exchange of Class C Common Stock 2,840,662 ( 2,840,662 ) — 1.2 % ( 1.2 )% — Vested LLC units — 178,895 178,895 ( 0.1 )% 0.1 % — Issued under equity-based compensation plans 3,190,429 — 3,190,429 0.4 % ( 0.4 )% — Total 173,652,398 62,857,813 236,510,211 73.4 % 26.6 % 100.0 % (1) Excludes 1,165,556 and 1,071,806 LLC Units still subject to vesting conditions at July 24, 2024 and December 31, 2024, respectively.

Equity-Based Compensation

Equity-Based Compensation	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Equity-Based Compensation	NOTE 11 – EQUITY-BASED COMPENSATION 2019 Common Unit Option Plan The 2019 Common Unit Option Plan (the 2019 Plan) was originally adopted by OneStream Software LLC’s board of managers and approved by the then members of OneStream Software LLC. The 2019 Plan allowed OneStream Software LLC to provide common unit options to eligible employees, managers, and consultants. Prior to the Reorganization Transactions, the Company did not recognize equity-based compensation expense for common unit options granted under the 2019 Plan because they contained a forfeiture provision whereby upon voluntary termination of service by the option holder, the Company had the right to require the option holder to (i) sell all or a portion of any common units acquired by the optionee to the Company at a price equal to the lesser of (a) the aggregate fair value of such common units on the date of such repurchase and (b) the aggregate exercise price paid to acquire the common units and (ii) surrender all outstanding common unit options, including vested options, held by such optionee without consideration. On July 12, 2024, the board of managers of OneStream Software LLC and the board of directors of the Company approved a modification of the terms of the outstanding common unit options to remove the forfeiture provision, to be effective immediately upon the completion of the Reorganization Transactions. The amendment has been accounted for as an “improbable-to-probable” modification under ASC 718, Compensation—Stock Compensation, whereby the fair values of the outstanding common unit options were measured as of the modification date of July 12, 2024 (the Option Modification Date). The performance condition created by the modification was satisfied upon completion of the Reorganization Transactions and the Company recorded a cumulative adjustment to equity-based compensation expense totaling $ 204.4 million for the common unit options that vested upon the completion of the Reorganization Transactions. The remaining unrecognized equity-based compensation expense related to the unvested common unit options granted prior to the Reorganization Transactions is being recognized over the remaining requisite service period using the accelerated attribution method, in which compensation cost for each vesting tranche is recognized ratably from the service inception date to the vesting date for that tranche. In connection with the Reorganization Transactions, the 2019 Plan was assumed by OneStream, Inc. and terminated with respect to the grant of new options. In addition, all outstanding common unit options were converted into options to purchase Class A common stock on a one-for-one basis. The following table summarizes the option activity under the 2019 Plan during the year ended December 31, 2024 (in thousands, except per share data): Options Weighted- Weighted- Outstanding as of December 31, 2023 28,761 $ 8.65 7.69 Granted 9,097 14.78 Forfeited / Cancelled ( 895 ) 10.12 Exercised ( 3,642 ) 7.94 Outstanding as of December 31, 2024 33,321 $ 10.58 7.63 Vested and exercisable as of December 31, 2024 16,369 $ 8.22 6.60 T he weighted-average grant date fair value of stock options granted under the 2019 Plan during the year ended December 31, 2024, was $ 10.03 . As of December 31, 2024, the aggregate intrinsic value of stock options exercised, outstanding, and vested and exercisable under the 2019 Plan was $ 82.3 million, $ 597.7 million and $ 332.3 million, respectively. Total unrecognized equity-based compensation expense related to stock options granted under the 2019 Plan was $ 104.7 million as of December 31, 2024 and will be recognized over the remaining requisite service period using the accelerated attribution method over a weighted-average period of 2.6 years. The Company estimated the fair value of the modified stock options under the 2019 Plan as of the Option Modification Date using a binomial lattice model incorporating an early exercise multiple and post-vesting termination rates. The assumptions and estimates used as part of the binomial lattice model were as follows: Fair Value of Class A Common Stock : The fair value of Class A common stock underlying the options granted under the 2019 Plan was determined to be the mid-point of the expected IPO price range as of the Option Modification Date. Expected Term : The expected term was a derived output of the binomial lattice model representing the weighted-average period the stock options are expected to remain outstanding. Expected Volatility : Expected volatility was estimated based on historical and implied stock price volatility from several guideline companies over a period equivalent to the expected term. Risk-free Interest Rate : The risk-free interest rate was based on the interpolated United States Treasury yield curve at each time-step in the lattice. Expected Dividend Yield : The estimated dividend yield is zero as the Company does not currently intend to declare dividends in the foreseeable future. Assumptions and estimates used as part of the binomial lattice model for options granted under the 2019 Plan and modified on the Option Modification Date were as follows: Fair value of Class A common stock $ 18.00 Expected term (in years) 0 - 7.44 Expected volatility 50.00 % Risk-free interest rate 4.34 - 5.40 % Expected dividend yield — Incentive Compensation Units From time to time prior to the Reorganization Transactions and the IPO, the board of managers of OneStream Software LLC granted ICUs to certain directors, officers and other employees pursuant to profits interest unit grant agreements. In connection with the Reorganization Transactions, the 8,632,763 ICUs outstanding as of the date of the IPO were reclassified into 6,591,178 LLC Units and holders of the newly issued LLC Units received an equal number of shares of Class C common stock. Such shares of Class C common stock are subject to the same terms and conditions, including vesting terms, as the ICUs that were reclassified into LLC Units. The Company classifies the unvested LLC Units (and corresponding shares of Class C common stock) as outstanding on its consolidated balance sheets as they are legally outstanding; however, these are excluded from the calculation of weighted average LLC Units outstanding during the period for purposes of calculating net loss attributable to the non-controlling interest in OneStream Software LLC as their distribution rights are forfeitable until vested. If a forfeiture of an unvested LLC Unit occurs, the associated shares of Class C common stock are also forfeited. The unvested LLC Units (and shares of Class C common stock) outstanding following the reclassification of outstanding unvested ICUs are summarized as follows (in thousands, except per share data): Shares Weighted- Unvested and outstanding immediately following completion of the Reorganization Transactions 241 $ 8.82 Vested subsequent to completion of the Reorganization Transactions 178 8.63 Unvested and outstanding as of December 31, 2024 63 $ 9.38 The Company evaluated the reclassification of ICUs as part of the Reorganization Transactions and concluded the impact on equity-based compensation expense was not material. As of December 31, 2024 , total unrecognized equity-based compensation related to the unvested shares of Class C common stock and unvested LLC Units was $ 0.3 million, which is expected to be recognized over a weighted-average period of 0.1 years. The fair value of these shares of Class C common stock and LLC Units that vested during the period from the date of the Reorganization Transactions to December 31, 2024 totaled $ 1.5 million. 2024 Equity Incentive Plan In connection with the IPO, the Company’s board of directors adopted the 2024 Plan, which became effective with an initial reserve of 32,100,000 shares of Class A common stock. The 2024 Plan provides for the grant of stock options, stock appreciation rights, restricted stock, RSUs, and performance awards to eligible employees, directors, and consultants. The number of shares available for issuance under the 2024 Plan also includes an annual increase on the first day of each fiscal year beginning on January 1, 2025 and ending on the ten year anniversary of the date our board of directors approved the 2024 Plan, in an amount equal to the least of (i) 26,800,000 shares of Class A common stock, (ii) 5 % of the outstanding shares of all series of the Company’s common stock on the last day of the immediately preceding fiscal year, or (iii) such other number as determined by the Administrator (as defined in the 2024 Plan). Stock options In July 2024, prior to the IPO, the Company granted to certain directors, executive officers and other employees 2,413,968 options to purchase Class A common stock under the 2024 Plan at an exercise price equal to the IPO price, which was $ 20.00 per share. These stock options vest upon the satisfaction of a liquidity condition and service-based condition of four years. The liquidity condition was satisfied through the completion of the IPO. No options have been granted after the IPO. The following table summarizes the option activity under the 2024 Plan during the year ended December 31, 2024 (in thousands, except per share data): Options Weighted- Weighted- Outstanding as of December 31, 2023 — $ — — Granted 2,414 20.00 Forfeited / Cancelled ( 11 ) 20.00 Exercised ( 3 ) 20.00 Outstanding as of December 31, 2024 2,400 $ 20.00 9.56 Vested and exercisable as of December 31, 2024 136 $ 20.00 9.56 T he weighted-average grant date fair value of stock options granted under the 2024 Plan during the year ended December 31, 2024 was $ 10.61 . As of December 31, 2024, the aggregate intrinsic value of stock options outstanding and stock options vested and exercisable under the 2024 Plan was $ 20.4 million and $ 1.2 million, respectively. As of December 31, 2024, the aggregate intrinsic value of stock options exercised under the 2024 Plan was not material. Total unrecognized equity-based compensation expense related to stock options under the 2024 Plan was $ 17.4 million as of December 31, 2024 and will be recognized over the remaining requisite service period using the accelerated attribution method over a weighted-average period of 3.6 years. The Company estimated the fair value of options granted under the 2024 Plan on the grant date using a Black-Scholes option-pricing model. The assumptions and estimates used as part of the Black-Scholes option-pricing model were as follows: Fair Value of Class A Common Stock : The fair value of Class A common stock underlying the options granted under the 2024 Plan was determined to be the IPO price. Expected Term : The expected term was estimated using the simplified method due to a lack of historical exercise activity for the Company. The simplified method calculates the expected term as the mid-point between the vesting date and the contractual expiration date of the award. Expected Volatility : Expected volatility was estimated based on historical and implied stock price volatility from several guideline companies over a period equivalent to the expected term. Risk-free Interest Rate : The risk-free interest rate was based on the United States Treasury yield curve in effect during the period the options were granted. Expected Dividend Yield : The estimated dividend yield is zero as the Company does not currently intend to declare dividends in the foreseeable future. Inputs used in the Black-Scholes option pricing model for options granted under the 2024 Plan were as follows: Fair value of Class A common stock $ 20.00 Expected term (in years) 6.06 - 6.11 Expected volatility 50.00 % Risk-free interest rate 4.24 % Expected dividend yield — Restricted Stock Units (RSUs) Subsequent to the Reorganization Transactions and the IPO, the Company has granted RSUs under the 2024 Plan to certain employees. RSUs represent the right to receive shares of Class A common stock at specified future dates. RSUs are subject to a service-based vesting condition that is generally satisfied over four years. Equity-based compensation expense related to RSUs is recognized on a straight-line basis over the remaining requisite service period. The following table summarizes the RSU activity during the year ended December 31, 2024 (in thousands, except per share data): RSUs Weighted- Outstanding as of December 31, 2023 — $ — Granted 366 29.49 Vested ( 5 ) 29.87 Forfeited / Cancelled ( 6 ) 29.87 Outstanding as of December 31, 2024 355 $ 29.48 As of December 31, 2024 , unrecognized compensation cost related to the RSUs was $ 10.1 million, which is expected to be recognized over a weighted-average period of 3.9 years. The Company recognized $ 0.5 million of equity-based compensation expense related to RSUs for the year ended December 31, 2024. 2024 Employee Stock Purchase Plan In connection with the IPO, the Company’s board of directors adopted the 2024 Employee Stock Purchase Plan (the ESPP). A total of 10,700,000 shares of Class A common stock were initially reserved for issuance under the ESPP. As of December 31, 2024, there have been no shares issued under this plan. Effective February 17, 2025, all eligible U.S. employees can participate in this plan. The number of shares available for issuance under the ESPP also includes an annual increase on the first day of each fiscal year following the fiscal year in which the first offering period under the ESPP commences, in an amount equal to the least of (i) 5,400,000 shares of Class A common stock, (ii) 1 % of the outstanding shares of all series of the Company’s common stock on the last day of the immediately preceding fiscal year, or (iii) such other number as determined by the Administrator (as defined in the ESPP). DataSense Common Unit Awards As part of the acquisition of DataSense on May 1, 2024, as described in Note 3, the founders of DataSense were awarded 1,023,720 common units at an aggregate fair value of $ 17.3 million, or $ 16.86 per common unit. Of the common units awarded, 14,418 were immediately vested and were included as part of the total purchase consideration. The remaining 1,009,302 common units are subject to performance-based vesting conditions measured on an annual basis over four years and a service-based condition tied to the continued employment of the founders with the Company, and the related equity-based compensation expense is amortized using the accelerated attribution method. In connection with the Reorganization Transactions, the common units awarded to the founders of DataSense were reclassified into an equal number of LLC Units and DataSense Holdings received an equal number of shares of Class C common stock. The Company evaluated the reclassification of these common units as part of the Reorganization Transactions and concluded the impact to equity-based compensation expense was not material. All LLC Units (and corresponding shares of Class C common stock) issued as a result of the reclassification of unvested common units remain subject to the same vesting requirements that existed prior to the Reorganization Transactions. The unvested LLC Units (and corresponding shares of Class C common stock) are classified as outstanding on the Company’s consolidated balance sheets as they are legally outstanding; however, these are excluded from the calculation of weighted average LLC Units outstanding during the period for purposes of calculating net loss attributed to the non-controlling interest in OneStream Software LLC as their distribution rights are forfeitable until vested. As of December 31, 2024, 1,009,302 LLC Units (and corresponding shares of Class C common stock) issued to DataSense Holdings remain unvested. The Company accounts for these common units based on their estimated grant date fair value. The fair value of the common units was established by OneStream Software LLC’s board of managers, after considering third-party valuations and input from management. The valuations of the common units were determined in accordance with the guidelines outlined in the American Institute of Certified Public Accountants Practice Aid, Valuation of Privately-Held Company Equity Securities Issued as Compensation . In valuing the common units, the fair value of OneStream Software LLC, or enterprise value, was determined using various methods under the market approach, including guideline public company and similar transaction methods. During the year ended December 31, 2024, the Company recognized equity-based compensation expense of $ 6.4 million related to the common units issued to DataSense Holdings. As of December 31, 2024 , unrecognized equity-based compensation cost related to these awards that are expected to vest was $ 10.6 million, which is expected to be recognized over a weighted-average period of 3.6 years. Refer to Note 3, Business Combinations, for further details on the acquisition. Classification of Equity-Based Compensation Expense Equity-based compensation expense was classified as follows in the accompanying consolidated statements of operations (in thousands): Year Ended December 31, 2024 2023 2022 Cost of subscription $ 5,939 $ — $ — Cost of professional services and other 24,871 15 78 Sales and marketing 135,215 3,938 2,847 Research and development 77,926 518 812 General and administrative 72,446 3,799 4,526 Total equity-based compensation $ 316,397 $ 8,270 $ 8,263

Net Loss Per Share

Net Loss Per Share	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Net Loss Per Share	NOTE 12 – NET LOSS PER SHARE The following table presents the calculation of basic and diluted net loss per share for the period following the Reorganization Transactions (in thousands, except per share amounts): July 24, 2024 through December 31, 2024 Numerator: Net loss $ ( 292,015 ) Less: net loss attributable to non-controlling interests ( 90,458 ) Net loss attributable to OneStream, Inc., basic $ ( 201,557 ) Net loss attributable to OneStream, Inc., dilutive $ ( 292,015 ) Denominator: Weighted-average shares of Class A and Class D common stock outstanding–basic 163,469 Effect of dilutive LLC Units 70,574 Weighted-average shares of Class A and Class D common stock outstanding–diluted 234,043 Net loss per share: Net loss per share of Class A and Class D common stock–basic $ ( 1.23 ) Net loss per share of Class A and Class D common stock–diluted $ ( 1.25 ) Shares of Class B common stock and Class C common stock do not share in the earnings or losses of OneStream, Inc. and are therefore not participating securities. As such, separate presentation of basic and diluted net loss per share of Class B and Class C common stock under the two-class method has not been presented. The effect of the Company’s potentially dilutive securities were not included in the calculation of diluted loss per share as the effect would be anti-dilutive. The following table contains outstanding share totals with a potentially dilutive impact (in thousands): December 31, 2024 Stock options 35,721 RSUs 355 Total 36,076

Postretirement Benefits

Postretirement Benefits	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Postretirement Benefits	NOTE 13 - POSTRETIREMENT BENEFITS The Company has established a 401(k) savings plan. The Company’s 401(k) plan is qualified under Section 401 of the Internal Revenue Code and is available to all full-time employees with tax-deferred salary deductions and alternative investment options. Employees may contribute up to 100 % of their salary up to the statutory prescribed annual limit. The 401(k) plan provides for the Company to make a discretionary contribution at the end of the plan year, which coincides with the Company’s fiscal year. The Company also makes contributions to other postretirement plans of non-U.S. employees based on statutory regulations in place in their respective countries. The Company recorded $ 7.7 million, $ 5.9 million and $ 4.3 million of expense related to employer contributions to postretirement benefit plans for the years ended December 31, 2024, 2023 and 2022, respectively.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2024
Related Party Transactions [Abstract]
Related Party Transactions	NOTE 14 – RELATED PARTY TRANSACTIONS DataSense Prior to the acquisition of DataSense, the Company was a party to consulting and software development services agreements with DataSense. The Company’s co-founder, chairman and CEO, Thomas Shea, is the father of Andrew Shea, who was the chief executive officer and an equity holder in DataSense until its acquisition by the Company. The Company held an equity method investment in DataSense that was immaterial as of December 31, 2023. The Company paid $ 1.9 million in 2024 through the acquisition date, and $ 3.5 million in the year ended December 31, 2023, under the consulting and software development services agreements with DataSense, which are included in the Company’s research and development expenses. There were no outstanding amounts due to or from DataSense as of December 31, 2023. Refer to Note 3, Business Combinations, for further details on the acquisition of DataSense.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Significant Accounting Policies [Line Items]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). The consolidated financial statements include the results of the Company and its wholly owned or controlled subsidiaries. As the Reorganization Transactions are considered transactions between entities under common control, the financial statements for periods prior to the IPO and Reorganization Transactions have been adjusted to combine the previously separate entities for presentation purposes. Prior to the Reorganization Transactions, OneStream, Inc. had no operations. All significant intercompany transactions and balances have been eliminated during consolidation.
Use of Estimates	Use of Estimates The preparation of the Company’s consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and the accompanying footnotes. Management bases its estimates on historical experience and on various other market-specific and relevant assumptions that management believes to be reasonable under the circumstances. Actual results could differ materially from those estimates.
Segment and Geographic Information	Segment and Geographic Information The Company operates in one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is evaluated regularly by the chief operating decision maker (CODM), who, in the Company’s case, is the Chief Executive Officer (CEO), in deciding how to allocate resources and assessing performance. The Company’s CODM allocates resources and assesses performance based upon financial information on a consolidated basis, primarily using consolidated net income (loss) as the measure of profit or loss to make key operating decisions. Consolidated expense information, as presented on the consolidated statements of operations, is regularly provided to the CODM. Revenue by geographic region, based on the physical location of the customer, was as follows (in thousands): Year Ended December 31, 2024 2023 2022 United States $ 334,746 $ 262,855 $ 202,533 Other 154,661 112,066 76,791 Total revenue $ 489,407 $ 374,921 $ 279,324 No foreign country accounted for 10 % or more of revenue during the years ended December 31, 2024, 2023 and 2022. As of December 31, 2024 and 2023 , 90 % and 92 % of the Company’s property and equipment, net was in the United States and the remaining 10 % and 8 % was in foreign countries, respectively.
Foreign Currency	Foreign Currency The functional currency of the Company’s foreign subsidiaries is primarily their respective local currency. The Company translates all assets and liabilities of foreign subsidiaries to U.S. dollars at the current exchange rate as of the applicable Consolidated Balance Sheet date. Revenue and expenses are translated at the average exchange rate prevailing during the period. The related unrealized gains and losses from foreign currency translation are recorded in accumulated other comprehensive loss as a component of stockholders’ / members’ equity. Foreign currency transaction gains and losses are included within other income (expense), net in the consolidated statements of operations.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments with an original maturity of three months or less from the date of purchase to be cash equivalents. The Company’s cash equivalents generally consist of amounts invested in money market funds. Cash equivalents are stated at fair value.
Fair Value Measurements	Fair Value Measurements The Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 820, Fair Value Measurements, requires entities to disclose the fair value of financial instruments, both assets and liabilities recognized and not recognized on the balance sheet, for which it is practicable to estimate fair value. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. ASC 820 describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, which are the following: Level 1: Quoted prices in active markets for identical or similar assets and liabilities. Level 2: Quoted prices for identical or similar assets and liabilities in markets that are not active or observable inputs other than quoted prices in active markets for identical or similar assets or liabilities. Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company’s financial instruments primarily include cash and cash equivalents, accounts receivable, accounts payable, and accrued expenses and other current liabilities. Cash and cash equivalents are stated at fair value using Level 1 inputs. The fair value of accounts receivable, accounts payable, and accrued expenses and other current liabilities approximate the carrying value because of their short-term nature.
Concentration of Risk and Significant Customers	Concentration of Risk and Significant Customers Financial instruments that subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. The Company maintains its cash deposits with high-quality financial institutions with investment-grade ratings. The majority of the Company’s cash balances are with U.S. banks and are insured to the extent defined by the Federal Deposit Insurance Corporation (FDIC) and may, at times, exceed FDIC limits. No customer accounted for more than 10 % of total revenue for the years ended December 31, 2024, 2023 and 2022 , and no customer accounted for more than 10 % of total accounts receivable as of December 31, 2024 and 2023. The Company relies upon a limited number of third-party hosted cloud computing vendors to serve customers and operate certain aspects of its services, such as environments for production, and development usage. Given this, any disruption of or interference at the hosted infrastructure partners would impact the Company’s operations and the Company’s business could be adversely impacted.
Property and Equipment	Property and Equipment Property and equipment are stated at cost, net of accumulated depreciation and amortization. Depreciation is computed using the straight‑line method over the estimated useful lives of the assets, which is generally three to seven years for furniture and equipment. The cost of leasehold improvements is depreciated over the lesser of the length of the related lease or seven years. Costs of maintenance and repairs are charged to expense as incurred.
Capitalized Software Costs	Capitalized Software Costs The Company capitalizes certain qualifying internal-use software costs. Qualifying costs are capitalized, and amortization begins when the software is ready for its intended use. The Company capitalized $ 0.9 mi llion, $ 1.2 million and $ 0.8 million of costs as internal-use software during the years ended December 31, 2024, 2023 and 2022, respectively. Capitalized software costs are amortized on a straight-line basis over the estimated useful life of the related software, which is generally three years. Amortization of internal-use software was $ 1.0 million for both the years ended December 31, 2024 and 2023, and $ 1.3 million for the year ended December 31, 2022. The Company has not capitalized any material ongoing costs of developing software products to be sold to third parties. Capitalization of development costs to be sold to third parties is required upon the establishment of technological feasibility of the product. New product versions are released on a regular basis, and the time between establishing technological feasibility and product release is very short. As a result, amounts that would qualify for capitalization have not been significant.
Deferred Offering Costs	Deferred Offering Costs Deferred offering costs consist primarily of accounting, legal, and other fees related to the Company’s IPO. During the year ended December 31, 2023, the Company abandoned its prior IPO preparations due to external market conditions and impaired $ 3.0 million of previously capitalized deferred offering costs. These costs were included in other income (expense) within the consolidated statement of operations for the year ended December 31, 2023. During the year ended December 31, 2024, the Company capitalized $ 7.2 million of offering costs related to the 2024 IPO, and after completion of the IPO, these costs were reclassified into stockholders’ equity as a reduction against the proceeds received from the IPO.
Revenue Recognition	Revenue Recognition Revenue related to contracts with customers is recognized in accordance with ASC 606, Revenue from Contracts with Customers. Revenue is recognized upon the transfer of control of promised products or services to customers in an amount that reflects the consideration the Company expects to receive in exchange for those products or services. Revenue is recognized net of any taxes collected from customers, which are subsequently remitted to governmental authorities. Contracts with customers are generally non-cancellable and consideration paid by the customer for software licenses and services received from the Company is non-refundable. As such, the Company does not estimate an allowance for refunds of services. Payment terms and conditions vary by contract type, although the Company’s terms generally include a requirement of payment within 30 to 60 days from the invoice date. In instances where the timing of revenue recognition differs from the timing of payment, the Company has determined that its contracts generally do not include a significant financing component. The primary purpose of the Company’s invoicing terms is to provide customers with simplified and predictable ways of purchasing the Company’s products and services, not to receive financing from its customers or to provide customers with financing, such as in the case of a multi-year term-based software license agreement that is invoiced annually with the software license revenue recognized upfront. The Company determines revenue recognition based on the following steps: 1. Identification of the contract, or contracts, with the customer 2. Identification of the performance obligations in the contract 3. Determination of the transaction price 4. Allocation of the transaction price to the performance obligations in the contract 5. Recognition of the revenue when, or as, a performance obligation is satisfied Subscription Revenue Subscription revenue consists of revenue from software-as-a-service (SaaS), post-contract customer support (PCS), and cloud computing. SaaS arrangements with customers provide the customer with continuous access to the Company’s hosted software platform over the contractual period. SaaS revenue is recognized ratably over the contract term beginning on the date access to the platform is provided, consistent with the transfer of control of the SaaS subscription to the customer. Cloud computing service fees are paid by those customers who choose to install and access their licensed software on a month-to-month subscription to a cloud hosting service offered by the Company, rather than manage it themselves. The Company’s performance obligation is to provide cloud computing services on a consumption basis during the contract term and the consideration received is based on customer consumption. The Company invoices and recognizes revenue for cloud computing services on a monthly basis as the service is utilized. PCS includes unspecified technical enhancements, customer support, and maintenance for licensed software. Revenue from PCS is recognized ratably over the contractual term of the arrangement, consistent with the pattern of benefit to the customer, beginning on the date the service is made available to the customer. License Revenue License revenue consists of license revenue from both the Company’s term-based and perpetual software licenses (collectively referred to herein as licensed software). The Company satisfies its performance obligation and recognizes revenue for licensed software at the point in time when the customer is able to use and benefit from the software, which is generally when it is first made available to the customer or upon commencement of the license term, if later. The typical length of a customer contract for term-based licensed software is three years and customers are generally invoiced in equal annual installments at the beginning of each year within the contractual period. Professional Services and Other Revenue Professional services and other revenue consist of fees associated with implementation and consulting services and training. Services do not result in significant customization of the software and are considered distinct. A substantial majority of the professional service contracts are provided on a time and materials basis and the related revenue is recognized as the service hours are performed. For time and materials projects, the Company invoices for services as the work is incurred. Contracts with Multiple Performance Obligations The Company has contracts with customers that contain multiple performance obligations that are distinct and are accounted for separately. For contracts with multiple performance obligations, such as licensed software sold with PCS, the transaction price is allocated to the separate performance obligations based on the relative stand‑alone selling price (SSP) of each distinct performance obligation. The Company estimates SSP at contract inception considering all information that is reasonably available and is based on the amount of consideration for which the Company expects to be entitled in exchange for transferring the promised good or service to the customer. Judgment is required to determine the SSP for each distinct performance obligation. In instances where the SSP is not directly observable because the Company does not sell the product or service separately, the Company estimates the SSP considering market conditions, historical pricing relationships, peer data, industry data for similar products, and other observable inputs. For licensed software, the Company determines the pricing relationship between the licensed software and PCS by maximizing the use of observable inputs, which attributes the majority of the contract value to the licensed software and a minority to PCS. Contract Modifications In limited situations, the Company enters into agreements to modify previously executed contracts, which constitute contract modifications. The Company assesses each of these contract modifications to determine (i) if the additional products and services are distinct from the products and services in the original arrangement; and (ii) if the amount of consideration expected for the added products and services reflects the stand-alone selling price of those products and services, as adjusted for contract-specific circumstances. A contract modification meeting both criteria is accounted for as a separate contract. A contract modification not meeting both criteria is considered a change to the original contract, which the Company accounts for on either: (i) a prospective basis as a termination of the existing contract and the creation of a new contract; or (ii) a cumulative catch-up basis. Generally, the Company’s contract modifications meet both criteria and are accounted for as a separate contract, as adjusted for contract-specific circumstances. Contract Balances Accounts receivable are recorded at the invoice amount, net of allowance for credit losses. A receivable is recorded in the period the Company delivers products or provides services, or when it has an unconditional right to payment. In multi-year agreements, the Company generally invoices customers in equal annual installments at the beginning of each year within the contractual period. The Company records a receivable for multi-year licensed software, whether or not billed, to the extent it has an unconditional right to receive payment in the future related to those licenses. The Company estimates the amount of uncollectible accounts receivable at the end of each reporting period and provides a reserve when needed based on an assessment of various factors including the aging of the receivable balance, historical experience, and expectations of forward-looking loss estimates. When developing the expectations of forward-looking loss estimates, the Company takes into consideration forecasts of future economic conditions, information about past events, such as historical trends of write-offs, and customer-specific circumstances, such as bankruptcies and disputes. Accounts receivable are written off when deemed uncollectible. Customer payment terms are typically net 30 to 60 days. As of December 31, 2024 and 2023 , the balance in the allowance for credit losses was $ 1.9 million and $ 1.2 million, respectively. T he Company recorded bad debt expense of $ 1.1 million, $ 1.6 million and $ 0.5 million for the years ended December 31, 2024, 2023 and 2022 respectively, which is presented in the consolidated statements of operations as general and administrative expenses. Deferred revenue consists of customer billings in advance of revenue being recognized. The Company primarily invoices its customers for SaaS arrangements, PCS, and term-based software licenses in equal annual installments at the beginning of each year within the contractual period, though certain contracts require invoicing for the entire arrangement in advance. Amounts anticipated to be recognized within one year of the balance sheet date are recorded on the consolidated balance sheets as deferred revenue, current; the remaining portion is recorded as deferred revenue, noncurrent. The balance of deferred revenue will fluctuate based on timing of invoices and recognition of revenue. The amount of revenue recognized during the years ended December 31, 2024 and 2023 that was included in deferred revenue at the beginning of each period was $ 178.4 million and $ 112.5 million, respectively. Transaction Price Allocated to Remaining Performance Obligations The transaction price allocated to remaining performance obligations represents contracted revenue that has not yet been recognized, which includes unearned revenue and unbilled amounts that will be recognized as revenue in future periods. The transaction price allocated to the remaining performance obligations is influenced by several factors, including seasonality, the timing of renewals, the timing of delivery of software licenses, average contract terms, and foreign currency exchange rates. Unbilled portions of the remaining performance obligations denominated in foreign currencies are revalued each period based on the period end exchange rates. Unbilled portions of the remaining performance obligations are subject to future economic risks including bankruptcies, regulatory changes, and other market factors. The aggregate amount of the transaction price allocated to remaining performance obligations as of December 31, 2024 was $ 1,103.9 million. The Company expects to recognize approximately 39 % of this amount as revenue in the next 12 months with the remaining balance recognized thereafter. Deferred Commissions The Company pays commissions for new sales of SaaS, cloud computing, and licensed software arrangements. Incremental sales commissions that are related to the acquisition of customer contracts are capitalized as deferred commissions on the consolidated balance sheets. The Company determines whether costs should be deferred based on whether the commissions are, in fact, incremental and would not have occurred absent the customer contract. The Company generally does not pay commissions for renewal contracts and therefore a portion of the commissions paid for new contracts relates to future renewals. Commissions incurred upon the acquisition of SaaS contracts are amortized over an estimated period of benefit of five years . Commissions incurred upon the acquisition of month-to-month cloud computing contracts are amortized over an estimated period of benefit of 12 months. Commissions incurred upon the initial acquisition of licensed software contracts are allocated in proportion to the allocation of the transaction price of the license and PCS performance obligations. Commissions allocated to the license are expensed at the time the license revenue is recognized, while commissions allocated to PCS are amortized over an estimated period of benefit of five years. Capitalized commission costs are recorded as deferred commissions on the consolidated balance sheets and amortized to sales and marketing in the consolidated statements of operations. The Company determines the period of benefit for commissions related to subscription sales by taking into consideration the historical initial and renewal contractual terms, estimated renewal rates, and the technological life of the platform and related significant features. The Company periodically reviews deferred commissions to determine whether events or changes in circumstances have occurred that could impact the period of benefit. There were no impairment losses recorded during the years ended December 31, 2024 and 2023. Cost of Revenues Cost of Subscription Revenue Cost of subscription revenue consists of costs related to cloud computing and supporting the Company’s customers. These expenses are primarily comprised of third-party direct server and cloud storage costs and employee costs related to providing software maintenance and customer support. Cost of Professional Services and Other Revenue Cost of professional services and other revenue primarily consist of expenses directly related to the implementation of the Company’s licensed software and costs to train the Company’s customers and partners. These expenses are primarily comprised of employee compensation costs related to implementation and training services.
Business Combinations	Business Combinations The Company accounts for acquisitions of entities that include inputs and processes and have the ability to create outputs as business combinations in accordance with FASB ASC 805, Business Combinations (ASC 805). Assets acquired and liabilities assumed, if any, are measured at their estimated fair values on the acquisition date. The excess of the purchase price over those fair values is recorded as goodwill. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the consolidated statements of operations. The determination of the fair value of identifiable assets requires management to make certain assumptions and estimates of, among other things, projected revenues and costs, future expected cash flows, and discount rates. Although the Company believes the assumptions and estimates it has made in the past have been reasonable and appropriate, these estimates are based on historical experience and information obtained from the management of the acquired companies and are inherently uncertain.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents the excess of purchase price over the fair value of net assets acquired in a business combination. The Company tests goodwill for impairment each year during the fourth quarter, or more frequently if an event occurs or circumstances change that could more-likely-than-not reduce the fair value of the Company’s sole reporting unit below its carrying value. To test for impairment, the Company first performs a qualitative assessment that evaluates various events and circumstances, such as macroeconomic conditions, industry and market conditions, cost factors, and relevant events and financial trends, that may impact a reporting unit’s fair value. Using this qualitative assessment, the Company determines whether it is more-likely-than-not the reporting unit’s fair value exceeds its carrying value. If it is determined that it is not more-likely-than-not the reporting unit’s fair value exceeds the carrying value, or upon consideration of other factors, including recent acquisition, restructuring or disposal activity, or to refresh the fair values, the Company performs a quantitative goodwill impairment analysis. No goodwill impairment has been recognized in any period presented. Other intangible assets consists of acquired developed technology, which the Company amortizes on a straight-line basis over the estimated useful life and reviews for impairment when warranted by changes in circumstance. No impairment of other intangible assets has been recognized in any period presented.
Non-controlling Interests	Non-controlling Interests Following the Reorganization Transactions, the Company consolidates the financial results of OneStream Software LLC. Therefore, the Company reports a non-controlling interest based on the LLC Units owned by the Continuing Members on the consolidated balance sheets. Net income (loss) attributed to the non-controlling interests is based on the weighted average LLC Units outstanding during the period, excluding LLC Units that are subject to vesting conditions, and is presented on the consolidated statements of operations and comprehensive loss. Refer to Note 10, Non-controlling Interests, for further details.
Equity-based Compensation	Equity-based Compensation The Company has issued equity-based awards to employees in the form of restricted stock units (RSUs) and stock options, and, prior to the Reorganization Transactions, OneStream Software LLC issued ICUs and common unit options, as described in Note 11. The Company accounts for equity-based awards based on their grant date fair values. Determining the grant date fair values of equity-based awards may require management to make assumptions and judgments. These assumptions reflect the Company’s best estimates, but they involve inherent uncertainties based on market conditions. As a result, if other assumptions are used, equity-based compensation costs could be materially impacted. Equity-based compensation expense is recognized on a straight-line basis for awards with service-only vesting conditions, whereas awards with performance conditions are recognized using the accelerated attribution method. Forfeitures are accounted for as they occur. Refer to Note 11, Equity-based Compensation, for further details on the Company’s equity-based compensation awards.
Net Loss per Share	Net Loss per Share Net loss per share is computed by dividing net loss attributable to OneStream, Inc. for the period following the IPO and Reorganization Transactions by the weighted-average number of shares of Class A common stock and Class D common stock outstanding during the same period. Diluted net loss per share is computed by giving effect to potential weighted-average dilutive shares for the period following the Reorganization Transactions, including additional shares of Class D common stock issuable upon redemption of LLC Units held by Continuing Members. For the period following the Reorganization Transactions through December 31, 2024, 70,574 LLC Units were considered potentially dilutive and have been included in the calculation of dilutive net loss per share. All losses and earnings for the period prior to the IPO were entirely allocable to OneStream Software LLC. Due to the impact of the Reorganization Transactions, the Company’s capital structure for the pre- and post-IPO periods is not comparable. As a result, the presentation of net (loss) income per share for the periods prior to the IPO and Reorganization Transactions is not meaningful and only net loss per share for periods subsequent to the IPO and Reorganization Transactions are presented herein.
Research and Development	Research and Development Research and development costs are expensed as incurred. Research and development costs consist primarily of employee compensation related costs associated with new product development and enhancements to existing software products.
Advertising Costs	Advertising Costs Advertising costs are expensed as incurred and recorded in the consolidated statements of operations as sales and marketing expense. The Company recorded advertising costs of $ 2.4 million , $ 1.6 million and $ 4.3 million for the years ended December 31, 2024, 2023 and 2022 , respectively.
Leases	Leases The Company determines if an arrangement is a lease at contract inception. Leases arise from contracts that convey the right to control the use of identified property or equipment for a period of time in exchange for consideration. Leases are classified at commencement as either operating or finance leases. As of December 31, 2024 and 2023, all of the Company’s leases were classified as operating leases. Rent expense for operating leases is recognized on a straight-line basis over the lease term beginning on the lease commencement date. Right-of-use (ROU) assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. In determining the present value of lease payments, the Company uses its secured incremental borrowing rate (IBR) based on the information available at the lease commencement date, including the lease term. In determining the appropriate IBR, the Company considers information including, but not limited to, the lease term and the currency in which the arrangement is denominated. The Company’s lease agreements may contain options to extend or terminate the lease. Such options are included in the lease term when they are considered reasonably certain to be exercised. ROU assets are subject to evaluation for impairment or disposal on a basis consistent with other long-lived assets. The Company’s lease agreements do not contain any material variable lease payments, any material residual value guarantees, or any material restrictions or covenants. Any leases with an initial term of 12 months or less are not recorded on the consolidated balance sheet.
Income Taxes	Income Taxes The Company follows the asset and liability method of accounting for income taxes under ASC 740, Income Taxes. Deferred income taxes are recognized by applying the enacted tax rates expected to be in effect in future years to the differences between financial statement carrying amounts of existing assets and liabilities and their respective tax bases as well as net operating losses and tax credit carryforwards. The measurement of deferred tax assets is reduced by a valuation allowance when it is more likely than not that some portion of the deferred tax assets will not be realized. For the tax benefits to be recognized, a tax position must be more-likely-than-not to be sustained upon examination by taxing authorities based on the technical merits of the position. For such positions, the largest benefit that has a greater than 50% likelihood of being realized upon settlement is recognized in the Company’s consolidated financial statements. The Company has elected to record future penalties and interest related to income taxes within its income tax provision. The Company has not incurred any significant interest or penalties related to income taxes in any of the periods presented.
JOBS Act Accounting Election	JOBS Act Accounting Election The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups (JOBS) Act of 2012. The JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. This provision allows an emerging growth company to delay the adoption of some accounting standards until those standards would otherwise apply to private companies. The Company has elected to use the extended transition period under the JOBS Act for the adoption of certain accounting standards until the earlier of the date the Company (i) is no longer an emerging growth company or (ii) affirmatively and irrevocably opts out of the extended transition period provided in the JOBS Act. As a result, the consolidated financial statements of the Company may not be comparable to companies that comply with new or revised accounting pronouncements as of public company effective dates.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In November 2023, the FASB issued Accounting Standards Update (ASU) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. The amendments in this update expand annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. The Company adopted this standard on December 31, 2024 . The adoption of this standard resulted in incremental segment reporting disclosures. Refer to the Segment and Geographic Information section of Note 2, Significant Accounting Policies, for further information. Recently Issued Accounting Pronouncements Not Yet Adopted In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, which requires the disclosures of additional information about specific expense categories in the notes to the financial statements. This ASU is effective for public business entities in fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027, with early adoption permitted. The standard allows for adoption on a prospective or retrospective basis. Early adoption is permitted. The adoption of this ASU is expected to result in incremental disclosures in the Company’s consolidated financial statements.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Summary of Revenue by Geographic Region	Revenue by geographic region, based on the physical location of the customer, was as follows (in thousands): Year Ended December 31, 2024 2023 2022 United States $ 334,746 $ 262,855 $ 202,533 Other 154,661 112,066 76,791 Total revenue $ 489,407 $ 374,921 $ 279,324

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2024
Business Combinations [Abstract]
Summary of Acquisition Date Fair Value of Total Consideration Transferred	The following table summarizes the total consideration transferred (in thousands): May 1, 2024 Cash $ 7,159 Amounts deposited into escrow 500 Fair value of equity consideration 243 Seller transaction costs paid by the Company 298 Settlement of payables existing prior to the acquisition ( 920 ) Fair value of previously held ownership interest 3,229 Total consideration $ 10,509
Summary of Allocation of Total Purchase Price	The following table summarizes the allocation of the total purchase price based upon the fair value of assets acquired and liabilities assumed as of the acquisition date, inclusive of measurement period adjustments (in thousands): May 1, 2024 Cash $ 363 Intangible assets – developed technology 3,300 Prepaid expenses and other current assets 20 Goodwill 9,280 Other accrued expenses and current liabilities ( 2,454 ) Total consideration $ 10,509

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Estimated Annual Amortization Expense	As of December 31, 2024, the estimated aggregate amortization expense for intangible assets for each of the five succeeding fiscal years was as follows (in thousands): Fiscal Year: 2025 $ 1,100 2026 1,100 2027 367 2028 — 2029 — Total expected amortization expense $ 2,567

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment, Net	The Company’s property and equipment, net consisted of the following (in thousands): As of December 31, 2024 2023 Leasehold improvements $ 9,038 $ 7,566 Capitalized software costs 5,264 4,172 Furniture and equipment 3,767 3,265 Construction in progress 244 583 Gross property and equipment 18,313 15,586 Less: Accumulated depreciation and amortization ( 8,229 ) ( 5,320 ) Property and equipment, net $ 10,084 $ 10,266

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Schedule of Lease Cost	The following lease costs were included in the consolidated statements of operations and comprehensive loss (in thousands): Year Ended December 31, 2024 2023 Operating lease cost $ 3,855 $ 3,560 Short-term lease cost 474 731 Variable lease cost 1,442 976 Total lease cost $ 5,771 $ 5,267
Schedule of Supplemental Information Relating to Operating Leases	Supplemental information relating to operating leases is presented below: Year Ended December 31, 2024 2023 Cash paid for operating lease liabilities (in thousands) $ 3,747 $ 3,001 Weighted-average remaining lease term (in years) 6.72 7.53 Weighted-average discount rate 4.6 % 4.3 %
Schedule of Future Minimum Commitments under Leases, Service Agreements and Other Contractual	The Company’s future minimum commitments under leases, service agreements, and other contractual commitments as of December 31, 2024 is as follows (in thousands): Operating Future Years ending December 31, 2025 $ 4,149 $ 22,780 2026 3,729 6,524 2027 2,583 105 2028 2,467 107 2029 2,373 — 2030 and thereafter 6,512 — Total payments 21,813 $ 29,516 Less: imputed interest ( 3,057 ) Less: leases less than 12 months ( 162 ) Total lease liabilities $ 18,594

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Loss Before Income Taxes	The components of the Company’s loss before income taxes were as follows (in thousands): Year Ended December 31, 2024 2023 2022 Domestic $ ( 286,591 ) $ ( 32,744 ) $ ( 68,048 ) Foreign ( 18,191 ) 5,229 3,241 Loss before income taxes $ ( 304,782 ) $ ( 27,515 ) $ ( 64,807 )
Schedule of Provision for Income Taxes	The provision for income taxes consisted of the following (in thousands): Year Ended December 31, 2024 2023 2022 Current: U.S. federal $ — $ — $ — State 126 70 3 Foreign 1,751 1,346 656 Total current $ 1,877 $ 1,416 $ 659 Deferred: U.S. Federal — — — State — — — Foreign — — — Total deferred $ — $ — $ — Provision for income taxes $ 1,877 $ 1,416 $ 659
Schedule of Reconciliation of the Income Tax Provision at the U.S. Federal Statutory Rate	A reconciliation of the income tax provision at the U.S. federal statutory rate to the Company’s provision for income taxes was as follows: Year Ended December 31, 2024 2023 2022 U.S. federal benefit at federal statutory rate ( 64,004 ) ( 5,778 ) ( 13,609 ) Increase (decrease) in rate resulting from: Valuation allowance 52,410 — — Loss allocable to non-controlling interest 17,763 — — Permanent items 1,015 405 — Withholding taxes 103 — — Flow-through income — 6,876 14,291 Foreign expense (benefit) differential ( 752 ) ( 206 ) ( 26 ) State taxes, net of federal tax benefit ( 5,264 ) 119 3 Other 606 — — Provision for income taxes $ 1,877 $ 1,416 $ 659
Components of the Company's Deferred Tax Assets and Liabilities	The components of the Company’s deferred tax assets and liabilities were as follows: Year Ended December 31, 2024 Deferred tax assets Net operating loss carryforwards $ 46,491 Investment in partnership 172,693 Equity-based compensation 5,261 Capital loss carryforward 2,508 Lease liabilities 1,518 Other 275 Gross deferred tax assets 228,746 Valuation allowance ( 227,225 ) Deferred tax assets, net of valuation allowance 1,521 Deferred tax liabilities Right-of-use assets ( 1,518 ) Other ( 3 ) Total deferred tax liabilities $ ( 1,521 ) Net deferred tax assets $ — For the year ended December 31, 2023, all deferred tax assets and liabilities above were immaterial.

Non-controlling Interests (Tabl

Non-controlling Interests (Tables)	12 Months Ended
	Dec. 31, 2024
Noncontrolling Interest [Abstract]
Summary of Ownership of LLC Units	The ownership of the LLC Units is summarized as follows: Ownership Ownership Percentage OneStream, Inc. Continuing Members (1) Total OneStream, Inc. Continuing Members (1) Total Balances at July 24, 2024 160,256,358 72,884,529 233,140,887 68.7 % 31.3 % 100.0 % Effects of Secondary Offering 7,364,949 ( 7,364,949 ) — 3.2 % ( 3.2 )% — Effect of exchange of Class C Common Stock 2,840,662 ( 2,840,662 ) — 1.2 % ( 1.2 )% — Vested LLC units — 178,895 178,895 ( 0.1 )% 0.1 % — Issued under equity-based compensation plans 3,190,429 — 3,190,429 0.4 % ( 0.4 )% — Total 173,652,398 62,857,813 236,510,211 73.4 % 26.6 % 100.0 % (1) Excludes 1,165,556 and 1,071,806 LLC Units still subject to vesting conditions at July 24, 2024 and December 31, 2024, respectively.

Equity-Based Compensation (Tabl

Equity-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Schedule of ICU's Outstanding and Unvested	The unvested LLC Units (and shares of Class C common stock) outstanding following the reclassification of outstanding unvested ICUs are summarized as follows (in thousands, except per share data): Shares Weighted- Unvested and outstanding immediately following completion of the Reorganization Transactions 241 $ 8.82 Vested subsequent to completion of the Reorganization Transactions 178 8.63 Unvested and outstanding as of December 31, 2024 63 $ 9.38
Summary of Restricted Stock Unit Activity	The following table summarizes the RSU activity during the year ended December 31, 2024 (in thousands, except per share data): RSUs Weighted- Outstanding as of December 31, 2023 — $ — Granted 366 29.49 Vested ( 5 ) 29.87 Forfeited / Cancelled ( 6 ) 29.87 Outstanding as of December 31, 2024 355 $ 29.48
Schedule of Equity-Based Compensation Expense	Equity-based compensation expense was classified as follows in the accompanying consolidated statements of operations (in thousands): Year Ended December 31, 2024 2023 2022 Cost of subscription $ 5,939 $ — $ — Cost of professional services and other 24,871 15 78 Sales and marketing 135,215 3,938 2,847 Research and development 77,926 518 812 General and administrative 72,446 3,799 4,526 Total equity-based compensation $ 316,397 $ 8,270 $ 8,263
2019 Common Unit Option Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Schedule of Stock Option Activity	The following table summarizes the option activity under the 2019 Plan during the year ended December 31, 2024 (in thousands, except per share data): Options Weighted- Weighted- Outstanding as of December 31, 2023 28,761 $ 8.65 7.69 Granted 9,097 14.78 Forfeited / Cancelled ( 895 ) 10.12 Exercised ( 3,642 ) 7.94 Outstanding as of December 31, 2024 33,321 $ 10.58 7.63 Vested and exercisable as of December 31, 2024 16,369 $ 8.22 6.60 T
Summary of Inputs Used in Option Pricing Model	Assumptions and estimates used as part of the binomial lattice model for options granted under the 2019 Plan and modified on the Option Modification Date were as follows: Fair value of Class A common stock $ 18.00 Expected term (in years) 0 - 7.44 Expected volatility 50.00 % Risk-free interest rate 4.34 - 5.40 % Expected dividend yield —
2024 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Schedule of Stock Option Activity	The following table summarizes the option activity under the 2024 Plan during the year ended December 31, 2024 (in thousands, except per share data): Options Weighted- Weighted- Outstanding as of December 31, 2023 — $ — — Granted 2,414 20.00 Forfeited / Cancelled ( 11 ) 20.00 Exercised ( 3 ) 20.00 Outstanding as of December 31, 2024 2,400 $ 20.00 9.56 Vested and exercisable as of December 31, 2024 136 $ 20.00 9.56 T
Summary of Inputs Used in Option Pricing Model	Inputs used in the Black-Scholes option pricing model for options granted under the 2024 Plan were as follows: Fair value of Class A common stock $ 20.00 Expected term (in years) 6.06 - 6.11 Expected volatility 50.00 % Risk-free interest rate 4.24 % Expected dividend yield —

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Net Loss Per Share	The following table presents the calculation of basic and diluted net loss per share for the period following the Reorganization Transactions (in thousands, except per share amounts): July 24, 2024 through December 31, 2024 Numerator: Net loss $ ( 292,015 ) Less: net loss attributable to non-controlling interests ( 90,458 ) Net loss attributable to OneStream, Inc., basic $ ( 201,557 ) Net loss attributable to OneStream, Inc., dilutive $ ( 292,015 ) Denominator: Weighted-average shares of Class A and Class D common stock outstanding–basic 163,469 Effect of dilutive LLC Units 70,574 Weighted-average shares of Class A and Class D common stock outstanding–diluted 234,043 Net loss per share: Net loss per share of Class A and Class D common stock–basic $ ( 1.23 ) Net loss per share of Class A and Class D common stock–diluted $ ( 1.25 )
Schedule of Outstanding Share Totals with Potentially Dilutive Impact	The following table contains outstanding share totals with a potentially dilutive impact (in thousands): December 31, 2024 Stock options 35,721 RSUs 355 Total 36,076

Organization and Description _2

Organization and Description of Business - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Jul. 25, 2024	Jul. 23, 2024	Dec. 31, 2024
Class of Stock [Line Items]
Net proceeds from IPO			$ 409,598
OneStream Software LLC | Initial Public Offering
Class of Stock [Line Items]
Net proceeds from IPO	$ 409,600
Purchase of issued and outstanding LLC units	$ 56,700
Shares issued and outstanding LLC units	3,006,037
Newly issued common LLC units	18,723,296
Net proceeds from LLC units	$ 352,900
Underwriting discounts and commissions	$ 25,000
Number of outstanding units issued in transaction		8,632,763
Reclassified number of units issued in transaction		6,591,178
Class A common stock | OneStream Software LLC | Initial Public Offering
Class of Stock [Line Items]
Number of shares issued in transaction	21,729,333
Public offering price	$ 20
Price per share	$ 0.0001
Class A common stock | OneStream Software LLC | Initial Public Offering | Existing Stockholders
Class of Stock [Line Items]
Number of shares issued in transaction	6,445,667
Class A common stock | OneStream Software LLC | Initial Public Offering | Executive Officers and Other Employees
Class of Stock [Line Items]
Number of share issued upon exercise of options granted	459,230
Class D Common Stock | OneStream Software LLC | Initial Public Offering | Existing Stockholders
Class of Stock [Line Items]
Shares converted into equal number of shares	5,986,437

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Details)	5 Months Ended	12 Months Ended
	Dec. 31, 2024 USD ($) shares	Dec. 31, 2024 USD ($) Segment Customer shares	Dec. 31, 2023 USD ($) Customer	Dec. 31, 2022 USD ($) Customer
Change in Accounting Estimate [Line Items]
Number of operating segment | Segment		1
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]		srt:ChiefExecutiveOfficerMember
Segment reporting, CODM, profit (loss) measure, how used, description		The Company’s CODM allocates resources and assesses performance based upon financial information on a consolidated basis, primarily using consolidated net income (loss) as the measure of profit or loss to make key operating decisions. Consolidated expense information, as presented on the consolidated statements of operations, is regularly provided to the CODM.
Percentage of property and equipment		As of December 31, 2024 and 2023, 90% and 92% of the Company’s property and equipment, net was in the United States and the remaining 10% and 8% was in foreign countries, respectively.
Capitalized of internal use software		$ 900,000	$ 1,200,000	$ 800,000
Amortization of internal use software		1,000,000	1,000,000	1,300,000
Deferred offering costs	$ 7,200,000	7,200,000	3,000,000
Allowance for doubtful accounts	$ 1,900,000	1,900,000	1,200,000
Bad debt expense		1,100,000	1,600,000	500,000
Revenue recognized included in deferred revenue		178,400,000	112,500,000
Deferred commission, impairment loss		0	0
Goodwill impairment		0	0	0
Impairment of other intangible assets		0	0	0
Advertising costs		$ 2,400,000	$ 1,600,000	$ 4,300,000
Potentially dilutive excluded from the calculation of dilutive net loss per share | shares		36,076
Change in accounting principle, accounting standards update, immaterial effect	false	false
Accounting Standards Update 2023-08
Change in Accounting Estimate [Line Items]
Change in accounting principle, accounting standards update, adopted	true	true
Change in accounting principle, accounting standards update, adoption date	Dec. 31, 2024	Dec. 31, 2024
SaaS Contracts
Change in Accounting Estimate [Line Items]
Amortization period of deferred commission	5 years	5 years
Cloud Computing Contracts
Change in Accounting Estimate [Line Items]
Amortization period of deferred commission	12 months	12 months
Licensed Software Contracts
Change in Accounting Estimate [Line Items]
Amortization period of deferred commission	5 years	5 years
Minimum
Change in Accounting Estimate [Line Items]
Payment term for contracts with customers		30 days
Applicable tax savings percentage		15%
Maximum
Change in Accounting Estimate [Line Items]
Payment term for contracts with customers		60 days
Applicable tax savings percentage		85%
OneStream, Inc
Change in Accounting Estimate [Line Items]
Potentially dilutive excluded from the calculation of dilutive net loss per share | shares	70,574
Revenue | Customer Concentration Risk | Customer
Change in Accounting Estimate [Line Items]
Concentration risk, percentage		10%	10%	10%
Number of customers | Customer		0	0	0
Revenue | Geographic Concentration Risk | Customer
Change in Accounting Estimate [Line Items]
Concentration risk, percentage			10%	10%
Accounts Receivable | Customer Concentration Risk | Customer
Change in Accounting Estimate [Line Items]
Concentration risk, percentage		10%	10%
Number of customers | Customer		0	0
Property and Equipment | Geographic Concentration Risk | United States
Change in Accounting Estimate [Line Items]
Concentration risk, percentage		90%	92%
Property and Equipment | Geographic Concentration Risk | Foreign Country
Change in Accounting Estimate [Line Items]
Concentration risk, percentage		10%	8%

Significant Accounting Polici_5

Significant Accounting Policies - Additional Information (Details1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01 $ in Millions	Dec. 31, 2024 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Aggregate amount of the transaction price	$ 1,103.9
Expects to recognize revenue over next 12 months, percentage	39%
Remaining performance obligation, expected timing of satisfaction, period	12 months

Significant Accounting Polici_6

Significant Accounting Policies - Summary of Revenue by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 489,407	$ 374,921	$ 279,324
United States
Disaggregation of Revenue [Line Items]
Total revenue	334,746	262,855	202,533
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 154,661	$ 112,066	$ 76,791

Business Combinations - Additio

Business Combinations - Additional Information (Details) - DataSense LLC - USD ($) $ in Thousands		12 Months Ended
	May 01, 2024	Dec. 31, 2024
Business Acquisition [Line Items]
Aggregate consideration paid in cash	$ 7,700
Payments to acquire businesses, cash deposited into escrow	500
Seller transaction costs paid by the Company	298
Business combination, equity interest in acquiree, gain on remeasurement		$ 2,400
Total amount deductible for tax purposes	$ 3,600
Amount deductible for tax purposes, amortized period	180 months
Remeasurement of previously held equity interest, fair value	$ 3,200
Business combination, equity method investment	$ 800
OneStream Software LLC
Business Acquisition [Line Items]
Business combination, shares purchased	1,023,720
Business combination, shares purchased subject to performance based vesting condition and service based conditions	1,009,302
Seller transaction costs paid by the Company	$ 300
Business combination, shares purchased, performance based vesting condition period	4 years

Business Combinations - Summary

Business Combinations - Summary of Acquisition Date Fair Value of Total Consideration Transferred (Details) - DataSense LLC $ in Thousands	May 01, 2024 USD ($)
Business Acquisition [Line Items]
Cash	$ 7,159
Amounts deposited into escrow	500
Fair value of equity consideration	243
Seller transaction costs paid by the Company	298
Settlement of payables existing prior to the acquisition	(920)
Fair value of previously held ownership interest	3,229
Total consideration	$ 10,509

Business Combinations - Summa_2

Business Combinations - Summary of Allocation of Total Purchase Price (Details) - USD ($) $ in Thousands	Dec. 31, 2024	May 01, 2024
Business Acquisition [Line Items]
Goodwill	$ 9,280
DataSense LLC
Business Acquisition [Line Items]
Cash		$ 363
Intangible assets - developed technology		3,300
Prepaid expenses and other current assets		20
Goodwill		9,280
Other accrued expenses and current liabilities		(2,454)
Total consideration		$ 10,509

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying amount of goodwill	$ 9,280,000
Gross carrying value of intangible assets	3,300,000
Accumulated amortization of intangible assets	700,000
Amortization of other intangible assets	$ 700,000	$ 0	$ 0
Weighted-average remaining useful life of intangible assets	2 years 3 months 18 days

Goodwill And Other Intangible_4

Goodwill And Other Intangible Assets - Schedule of Estimated Annual Amortization Expense (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2025	$ 1,100
2026	1,100
2027	367
Total expected amortization expense	$ 2,567

Property and Equipment - Schedu

Property and Equipment - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 18,313	$ 15,586
Less: Accumulated depreciation and amortization	(8,229)	(5,320)
Property and equipment, net	10,084	10,266
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property and equipment	9,038	7,566
Capitalized software costs
Property, Plant and Equipment [Line Items]
Gross property and equipment	5,264	4,172
Furniture and equipment
Property, Plant and Equipment [Line Items]
Gross property and equipment	3,767	3,265
Construction in progress
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 244	$ 583

Property and Equipment - Additi

Property and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 2.9	$ 2.9	$ 2.7

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 3,855	$ 3,560
Short-term lease cost	474	731
Variable lease cost	1,442	976
Total lease cost	$ 5,771	$ 5,267

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Supplemental Information Relating to Operating Leases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Cash paid for operating lease liabilities (in thousands)	$ 3,747	$ 3,001
Weighted-average remaining lease term (in years)	6 years 8 months 19 days	7 years 6 months 10 days
Weighted-average discount rate	4.60%	4.30%

Commitments and Contingencies_3

Commitments and Contingencies - Schedule of Future Minimum Commitments under Leases, Service Agreements and Other Contractual (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating Lease Obligations, 2025	$ 4,149
Operating Lease Obligations, 2026	3,729
Operating Lease Obligations, 2027	2,583
Operating Lease Obligations, 2028	2,467
Operating Lease Obligations, 2029	2,373
Operating Lease Obligations, 2030 and thereafter	6,512
Operating Lease Obligations, Total payments	21,813
Less: imputed interest	(3,057)
Less: leases less than 12 months	(162)
Operating Lease, Obligations, Total Lease Liabilities	18,594
Future Purchase Obligations, 2025	22,780
Future Purchase Obligations, 2026	6,524
Future Purchase Obligations, 2027	105
Future Purchase Obligations, 2028	107
Future Purchase Obligations, 2029	0
Future Purchase Obligations, 2030 and thereafter	0
Future Purchase Obligations, Total Payments	$ 29,516

Commitments and Contingencies_4

Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended
	Jun. 30, 2022	Dec. 31, 2024	Nov. 07, 2024
Loss Contingencies [Line Items]
Purchase commitment		$ 29,516,000
Consumption Agreement
Loss Contingencies [Line Items]
Number of years for agreement	5 years
Purchase commitment	$ 300,000,000		$ 360,000,000
Minimum annual spending requirement	$ 0
Remaining commitment under the agreement		$ 227,200,000

Debt - Additional Information (

Debt - Additional Information (Details) - Revolving Credit Facility - USD ($)	1 Months Ended		12 Months Ended
	Oct. 31, 2023	Jan. 31, 2020	Dec. 31, 2024
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 50,000,000
Line of credit facility, additional borrowing capacity		25,000,000
Borrowing capacity	$ 150,000,000	$ 50,000,000
Debt instrument, maturity date	Oct. 27, 2028
Incurred finance costs	$ 500,000
Debt instrument variable interest rate basis			The ABR is defined as, for any day, a rate per annum equal to the greatest of (a) the prime rate in effect on such day, (b) the Federal Reserve Bank of New York (NYFRB) rate in effect on such day plus ½ of 1% and (c) Term SOFR for a one month interest period on such day (or if such day is not a Business Day, the immediately preceding business day) plus 1%.
Undrawn portion of credit facility, percentage of fees per annum		0.25%
Debt instrument, covenant terms			The Company must also not permit the ratio of indebtedness to total recurring revenue for the most recent trailing four quarters to exceed 0.50 to 1.00, and is required to maintain $50.0 million in liquidity.
Debt instrument covenant liquidity amount to maintain			$ 50,000,000
Minimum
Line of Credit Facility [Line Items]
Debt liquidity ratio		0.50%
Maximum
Line of Credit Facility [Line Items]
Debt liquidity ratio		1%
ABR Loans
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.50%
SOFR Loans
Line of Credit Facility [Line Items]
Basis spread on variable rate		2.50%

Income Taxes - Schedule of Loss

Income Taxes - Schedule of Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Domestic	$ (286,591)	$ (32,744)	$ (68,048)
Foreign	(18,191)	5,229	3,241
Loss before income taxes	$ (304,782)	$ (27,515)	$ (64,807)

Income Taxes - Schedule of Prov

Income Taxes - Schedule of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current:
U.S. Federal	$ 0	$ 0	$ 0
State	126	70	3
Foreign	1,751	1,346	656
Total current	1,877	1,416	659
Deferred:
Provision for income taxes	$ 1,877	$ 1,416	$ 659

Income Taxes - Schedule of Reco

Income Taxes - Schedule of Reconciliation of the Income Tax Provision at the U.S. Federal Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
U.S. federal benefit at federal statutory rate	$ (64,004)	$ (5,778)	$ (13,609)
Increase (decrease) in rate resulting from:
Valuation allowance	52,410
Loss allocable to non-controlling interest	17,763
Permanent items	1,015	405
Withholding taxes	103
Flow-through income		6,876	14,291
Foreign expense (benefit) differential	(752)	(206)	(26)
State taxes, net of federal tax benefit	(5,264)	119	3
Other	606
Provision for income taxes	$ 1,877	$ 1,416	$ 659

Income Taxes - Components of th

Income Taxes - Components of the Company's Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets
Net operating loss carryforwards	$ 46,491,000
Investment in partnership	172,693,000
Equity-based compensation	5,261,000
Capital loss carryforward	2,508,000
Lease liabilities	1,518,000
Other	275,000
Gross deferred tax assets	228,746,000
Valuation allowance	(227,225,000)
Deferred tax assets, net of valuation allowance	1,521,000
Deferred tax liabilities
Right-of-use assets	(1,518,000)
Other	(3,000)
Total deferred tax liabilities	(1,521,000)
Net deferred tax assets	$ 0	$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) € in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Effective Income Tax Rate Reconciliation [Line Items]
U.S. statutory tax rate	21%	21%	21%	21%
Deferred tax assets, capital loss carryforwards	$ 2,508,000
U.S. federal income tax net operating loss carryforwards	$ 209,800,000
Utilization limit to taxable income from net operating loss carryforwards	80%
State net operating loss carryforwards	$ 47,400,000
Capital loss carryforward expiration year	2028	2028
State net operating loss carryforward expiration year beginning	2029	2029
Uncertain tax positions	$ 0		$ 0
Interest or penalties incur	$ 0		0	$ 0
Global minimum income tax rate	15%	15%
Deferred tax asset	$ 0		$ 0
Revenue Threshold | €		€ 750
Provision for foreign income taxes	0
Provision for domestic income taxes	0
Tax receivable agreement liability	0
Exchange units, value	136,600,000
OneStream Software LLC
Effective Income Tax Rate Reconciliation [Line Items]
Deferred tax assets, investments	172,700,000
Federal Jurisdictions
Effective Income Tax Rate Reconciliation [Line Items]
Deferred tax assets, capital loss carryforwards	44,100,000
State Jurisdictions
Effective Income Tax Rate Reconciliation [Line Items]
Deferred tax assets, capital loss carryforwards	$ 2,400,000
Minimum
Effective Income Tax Rate Reconciliation [Line Items]
Available tax savings percentage	15%	15%
Maximum
Effective Income Tax Rate Reconciliation [Line Items]
Available tax savings percentage	85%	85%

Stockholders' _ Members' Equi_2

Stockholders' / Members' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Nov. 30, 2024 $ / shares shares	Dec. 31, 2024 $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2022 USD ($)
Class of Stock [Line Items]
Preferred stock, shares authorized		100,000,000	100,000,000
Preferred stock, par value | $ / shares		$ 0.0001	$ 0.0001
Preferred stock, shares outstanding		0	0
Costs incurred in connection with the offering | $			$ 5,437	$ 1,919
Secondary Offering
Class of Stock [Line Items]
Equity offering expenses | $			$ 1,300
Recapitalization of OneStream Software LLC | LLC Units
Class of Stock [Line Items]
Stock outstanding ratio			1
OneStream, Inc | Recapitalization of OneStream Software LLC
Class of Stock [Line Items]
Common stock, shares outstanding		80,324,378	80,324,378
OneStream, Inc | Recapitalization of OneStream Software LLC | LLC Units
Class of Stock [Line Items]
Shares outstanding		6,591,178	6,591,178
Class A common stock
Class of Stock [Line Items]
Common stock, shares authorized		2,500,000,000	2,500,000,000
Common stock, par value | $ / shares		$ 0.0001	$ 0.0001
Common stock, voting rights			Each share of Class A common stock is entitled to one vote per share and has economic rights.
Common stock, shares outstanding		51,456,091	51,456,091
Common stock, shares, issued		51,456,091	51,456,091
Class A common stock | Secondary Offering
Class of Stock [Line Items]
Common stock, shares, issued	17,250,000
Common stock, shares sold	10,357,991
Class A common stock | Synthetic Secondary
Class of Stock [Line Items]
Common stock, shares sold	6,892,009
Share price | $ / shares	$ 31
Class A common stock | LLC Units
Class of Stock [Line Items]
Number of units redeemed		2,840,662
Class B common stock
Class of Stock [Line Items]
Common stock, shares authorized		300,000,000	300,000,000
Common stock, par value | $ / shares		$ 0.0001	$ 0.0001
Common stock, voting rights			Each share of Class B common stock is entitled to one vote per share, is cancellable upon the redemption or exchange of one LLC Unit for cash or one share of Class A common stock and has no economic rights.
Common stock, shares outstanding		0	0
Common stock, shares, issued		0	0
Class C Common Stock
Class of Stock [Line Items]
Common stock, shares authorized		300,000,000	300,000,000
Common stock, par value | $ / shares		$ 0.0001	$ 0.0001
Common stock, voting rights			Each share of Class C common stock is entitled to ten votes per share, is cancellable upon the redemption or exchange of one LLC Unit for cash or one share of Class D common stock, is convertible into one share of Class B common stock, and has no economic rights.
Common stock, shares outstanding		63,929,619	63,929,619
Common stock, shares, issued		63,929,619	63,929,619
Class C Common Stock | Secondary Offering
Class of Stock [Line Items]
Redeemed common stock shares issued LLC units	472,940
Redeemed common stock shares outstanding LLC units	472,940
Class C Common Stock | Recapitalization of OneStream Software LLC
Class of Stock [Line Items]
Shares issued and outstanding LLC units		3,006,037	3,006,037
Common stock, shares, issued		74,135,230	74,135,230
Class D Common Stock
Class of Stock [Line Items]
Common stock, shares authorized		600,000,000	600,000,000
Common stock, par value | $ / shares		$ 0.0001	$ 0.0001
Common stock, voting rights			Each share of Class D common stock is entitled to ten votes per share, is convertible into one share of Class A common stock and has economic rights.
Common stock, shares outstanding		122,196,307	122,196,307
Common stock, shares, issued		122,196,307	122,196,307
Class D Common Stock | Secondary Offering
Class of Stock [Line Items]
Redeemed common stock shares issued LLC units	472,940
Redeemed common stock shares outstanding LLC units	472,940
Effect of exchanges of LLC Units	10,357,991
Class D Common Stock | Recapitalization of OneStream Software LLC
Class of Stock [Line Items]
Shares converted into equal number of shares			5,986,437
Common stock, shares, issued		132,081,358	132,081,358
Preferred stock | Recapitalization of OneStream Software LLC | LLC Units
Class of Stock [Line Items]
Stock outstanding ratio			1
Preferred stock | OneStream, Inc | Recapitalization of OneStream Software LLC
Class of Stock [Line Items]
Shares outstanding		128,293,508	128,293,508
Incentive Compensation Units | OneStream, Inc | Recapitalization of OneStream Software LLC
Class of Stock [Line Items]
Shares outstanding		8,632,763	8,632,763
Class A and Class D common stock | Recapitalization of OneStream Software LLC | LLC Units
Class of Stock [Line Items]
Stock outstanding ratio			1
Class B and Class C common stock | Recapitalization of OneStream Software LLC | LLC Units
Class of Stock [Line Items]
Stock outstanding ratio			1

Non-controlling Interests - Add

Non-controlling Interests - Additional Information (Details) - OneStream, Inc.	Dec. 31, 2024
Noncontrolling Interest [Line Items]
Ownership percentage	73.40%
OneStream Software LLC
Noncontrolling Interest [Line Items]
Ownership percentage, Noncontrolling interest	26.60%

Non-controlling Interests - Sum

Non-controlling Interests - Summary of Ownership of the LLC Units (Details)	Dec. 31, 2024 shares
Noncontrolling Interest [Line Items]
Common units outstanding	236,510,211
Total	100%
Vested LLC units
Noncontrolling Interest [Line Items]
Common units outstanding	178,895
Issued Under Equity-based Compensation Plans
Noncontrolling Interest [Line Items]
Common units outstanding	3,190,429
Balances at July 24, 2024
Noncontrolling Interest [Line Items]
Common units outstanding	233,140,887
Total	100%
OneStream, Inc.
Noncontrolling Interest [Line Items]
Common units outstanding	173,652,398
Ownership percentage	73.40%
OneStream, Inc. | Vested LLC units
Noncontrolling Interest [Line Items]
Ownership percentage	(0.10%)
OneStream, Inc. | Issued Under Equity-based Compensation Plans
Noncontrolling Interest [Line Items]
Common units outstanding	3,190,429
Ownership percentage	0.40%
OneStream, Inc. | Balances at July 24, 2024
Noncontrolling Interest [Line Items]
Common units outstanding	160,256,358
Ownership percentage	68.70%
OneStream, Inc. | Effects of Secondary Offering
Noncontrolling Interest [Line Items]
Common units outstanding	7,364,949
Ownership percentage	3.20%
OneStream, Inc. | Effect of Exchange of Class C Common Stock
Noncontrolling Interest [Line Items]
Common units outstanding	2,840,662
Ownership percentage	1.20%
Continuing Members | OneStream, Inc.
Noncontrolling Interest [Line Items]
Common units outstanding	62,857,813	[1]
Ownership percentage, Noncontrolling interest	26.60%	[1]
Continuing Members | OneStream, Inc. | Vested LLC units
Noncontrolling Interest [Line Items]
Common units outstanding	178,895	[1]
Ownership percentage, Noncontrolling interest	0.10%	[1]
Continuing Members | OneStream, Inc. | Issued Under Equity-based Compensation Plans
Noncontrolling Interest [Line Items]
Ownership percentage, Noncontrolling interest	(0.40%)	[1]
Continuing Members | OneStream, Inc. | Balances at July 24, 2024
Noncontrolling Interest [Line Items]
Common units outstanding	72,884,529	[1]
Ownership percentage, Noncontrolling interest	31.30%	[1]
Continuing Members | OneStream, Inc. | Effects of Secondary Offering
Noncontrolling Interest [Line Items]
Common units outstanding	(7,364,949)	[1]
Ownership percentage, Noncontrolling interest	(3.20%)	[1]
Continuing Members | OneStream, Inc. | Effect of Exchange of Class C Common Stock
Noncontrolling Interest [Line Items]
Common units outstanding	(2,840,662)	[1]
Ownership percentage, Noncontrolling interest	(1.20%)	[1]
[1] Excludes 1,165,556 and 1,071,806 LLC Units still subject to vesting conditions at July 24, 2024 and December 31, 2024, respectively.

Non-controlling Interests - S_2

Non-controlling Interests - Summary of Ownership of the LLC Units (Parenthetical) (Details) - shares	Dec. 31, 2024	Jul. 24, 2024
Continuing Members | OneStream, Inc.
Noncontrolling Interest [Line Items]
LLC Units subject to vesting conditions	1,071,806	1,165,556

Equity-Based Compensation - Add

Equity-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Jul. 25, 2024	Jul. 23, 2024	May 01, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized equity-based compensation cost, weighted-average period				2 years 7 months 6 days
Equity-based compensation expense				$ 316,397	$ 8,270	$ 8,263
Initial Public Offering | OneStream Software LLC
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of outstanding units issued in transaction		8,632,763
Reclassified number of units issued in transaction		6,591,178
2024 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized equity-based compensation cost, weighted-average period				3 years 7 months 6 days
Weighted-average grant date fair value of options granted				$ 10.61
Aggregate intrinsic value of stock options outstanding				$ 20,400
Stock options vested and exercisable				136,000
Aggregate intrinsic value of stock options vested and exercisable				$ 1,200
Unrecognized equity-based compensation expense				$ 17,400
Shares granted				2,414,000
Percentage of number of shares of capital stock outstanding on last day of preceding year				5%
2019 Common Unit Option Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted-average grant date fair value of options granted				$ 10.03
Options exercised, intrinsic value				$ 82,300
Aggregate intrinsic value of stock options outstanding				$ 597,700
Stock options vested and exercisable				16,369,000
Aggregate intrinsic value of stock options vested and exercisable				$ 332,300
Unrecognized equity-based compensation expense				104,700
Equity-based compensation expense				$ 204,400
Shares granted				9,097,000
2024 Employee Stock Purchase Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Percentage of number of shares of capital stock outstanding on last day of preceding year				1%
Class A common stock | Initial Public Offering | OneStream Software LLC
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Price per share	$ 0.0001
Public offering price	$ 20
Class A common stock | 2024 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock reserved for future issuance				26,800,000
Class A common stock | 2024 Equity Incentive Plan | Initial Public Offering
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock reserved for future issuance	32,100,000
Class A common stock | 2024 Equity Incentive Plan | Initial Public Offering | OneStream Software LLC
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares granted	2,413,968
Class A common stock | 2024 Employee Stock Purchase Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock reserved for future issuance				5,400,000
Class A common stock | 2024 Employee Stock Purchase Plan | Initial Public Offering | OneStream Software LLC
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock reserved for future issuance	10,700,000
DataSense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Price per share			$ 16.86
Shares granted			1,023,720
Common units vested			14,418
Incentive Compensation Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total fair value of shares vested				$ 1,500
Unrecognized equity-based compensation cost				$ 300
Unrecognized equity-based compensation cost, weighted-average period				1 month 6 days
Performance-based Shares | DataSense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized equity-based compensation cost				$ 10,600
Unrecognized equity-based compensation cost, weighted-average period				3 years 7 months 6 days
Equity-based compensation expense				$ 6,400
Shares granted			1,009,302
Equity-based compensation vesting term			4 years
Fair value of equity awards			$ 17,300
Performance-based Shares | DataSense | Class C common stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares granted				1,009,302
RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares granted				366,000
Unrecognized equity-based compensation cost				$ 10,100
Unrecognized equity-based compensation cost, weighted-average period				3 years 10 months 24 days
Equity-based compensation expense				$ 500

Equity-Based Compensation - Sch

Equity-Based Compensation - Schedule of Stock Option Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2024 $ / shares shares	Dec. 31, 2023 $ / shares shares
2019 Common Unit Option Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options, Outstanding, Beginning balance | shares	28,761
Options, Granted | shares	9,097
Options, Forfeited / Cancelled | shares	(895)
Options, Exercised | shares	(3,642)
Options, Outstanding, Ending balance | shares	33,321	28,761
Options, Vested and exercisable | shares	16,369
Weighted-Average Exercise Price, Beginning balance | $ / shares	$ 8.65
Weighted-Average Exercise Price, Granted | $ / shares	14.78
Weighted-Average Exercise Price, Forfeited / Cancelled | $ / shares	10.12
Weighted-Average Exercise Price, Exercised | $ / shares	7.94
Weighted-Average Exercise Price, Ending balance | $ / shares	10.58	$ 8.65
Weighted-Average Exercise Price, Vested and exercisable | $ / shares	$ 8.22
Weighted-Average Remaining Contractual Term (Years)	7 years 7 months 17 days	7 years 8 months 8 days
Weighted-Average Remaining Contractual Term (Years), Vested and exercisable	6 years 7 months 6 days
2024 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Options, Granted | shares	2,414
Options, Forfeited / Cancelled | shares	(11)
Options, Exercised | shares	(3)
Options, Outstanding, Ending balance | shares	2,400
Options, Vested and exercisable | shares	136
Weighted-Average Exercise Price, Granted | $ / shares	$ 20
Weighted-Average Exercise Price, Forfeited / Cancelled | $ / shares	20
Weighted-Average Exercise Price, Exercised | $ / shares	20
Weighted-Average Exercise Price, Ending balance | $ / shares	20
Weighted-Average Exercise Price, Vested and exercisable | $ / shares	$ 20
Weighted-Average Remaining Contractual Term (Years)	9 years 6 months 21 days
Weighted-Average Remaining Contractual Term (Years), Vested and exercisable	9 years 6 months 21 days

Equity-Based Compensation - Sum

Equity-Based Compensation - Summary of Inputs Used in Option Pricing Model (Details) - $ / shares		12 Months Ended
	Jul. 14, 2024	Dec. 31, 2024
Binomial Pricing Model [Member] | 2019 Common Unit Option Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected volatility	50%
Risk-free interest rate, Minimum	4.34%
Risk-free interest rate, Maximum	5.40%
Binomial Pricing Model [Member] | 2019 Common Unit Option Plan | Class A common stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value of Class A common stock	$ 18
Binomial Pricing Model [Member] | 2019 Common Unit Option Plan | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected term (in years)	7 years 5 months 8 days
Binomial Pricing Model [Member] | 2019 Common Unit Option Plan | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected term (in years)	0 years
Black-Scholes-Merton Model [Member] | Class A common stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value of Class A common stock		$ 20
Black-Scholes-Merton Model [Member] | 2024 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected volatility		50%
Risk-free interest rate		4.24%
Black-Scholes-Merton Model [Member] | 2024 Equity Incentive Plan | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected term (in years)		6 years 1 month 9 days
Black-Scholes-Merton Model [Member] | 2024 Equity Incentive Plan | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Expected term (in years)		6 years 21 days

Equity-Based Compensation - S_2

Equity-Based Compensation - Schedule of ICU's Outstanding and Unvested (Details) - Incentive Compensation Units shares in Thousands	12 Months Ended
	Dec. 31, 2024 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unvested and outstanding immediately following completion of the Reorganization Transactions | shares	241
Vested subsequent to completion of the Reorganization Transactions | shares	178
Unvested and outstanding as of September 30, 2024 | shares	63
Weighted average grant date fair value, Unvested and outstanding immediately following completion of the Reorganization Transactions | $ / shares	$ 8.82
Weighted average grant date fair value, Vested subsequent to completion of the Reorganization Transactions | $ / shares	8.63
Weighted average grant date fair value, Unvested and outstanding as of September 30, 2024 | $ / shares	$ 9.38

Equity-Based Compensation - S_3

Equity-Based Compensation - Summary of Restricted Stock Unit Activity (Details) - RSUs shares in Thousands	12 Months Ended
	Dec. 31, 2024 $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
RSU, Granted | shares	366
RSU, Vested | shares	(5)
RSU, Forfeited / Cancelled | shares	(6)
RSU, Outstanding, Ending Balance | shares	355
Weighted-Average Grant Date Fair Value, Granted | $ / shares	$ 29.49
Weighted-Average Grant Date Fair Value, Vested | $ / shares	29.87
Weighted-Average Grant Date Fair Value, Forfeited / Cancelled | $ / shares	29.87
Weighted-Average Grant Date Fair Value, Ending Balance | $ / shares	$ 29.48

Equity-Based Compensation - S_4

Equity-Based Compensation - Schedule of Equity-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Equity-based compensation expense	$ 316,397	$ 8,270	$ 8,263
Cost of Subscription
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Equity-based compensation expense	5,939
Cost of Professional Services and Other
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Equity-based compensation expense	24,871	15	78
Sales and Marketing
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Equity-based compensation expense	135,215	3,938	2,847
Research and Development
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Equity-based compensation expense	77,926	518	812
General and Administrative
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Equity-based compensation expense	$ 72,446	$ 3,799	$ 4,526

Net Loss Per Share - Schedule o

Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2024	Jul. 23, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net loss	$ (292,015)	$ (14,644)	$ (306,659)	$ (28,931)	$ (65,466)
Less: net loss attributable to non-controlling interest	(90,458)		$ (90,458)
Net loss attributable to OneStream, Inc., basic	(201,557)
Net loss attributable to OneStream, Inc., dilutive	$ (292,015)
Weighted-average shares of Class A and Class D common stock outstanding-basic	163,469
Effect of dilutive LLC Units	70,574
Weighted-average shares of Class A and Class D common stock outstanding-diluted	234,043
Net loss per share of Class A and Class D common stock-basic	$ (1.23)
Net loss per share of Class A and Class D common stock-diluted	$ (1.25)

Net Loss Per Share - Schedule_2

Net Loss Per Share - Schedule of Outstanding Share Totals with Potentially Dilutive Impact (Details)	12 Months Ended
	Dec. 31, 2024 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	36,076
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	35,721
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total	355

Postretirement Benefits - Addit

Postretirement Benefits - Additional Information (Details) - Postretirement Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Annual limit of employees contribution, Percentage	100%
Expense related to employer contributions	$ 7.7	$ 5.9	$ 4.3

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) - USD ($)		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Company paid	[1]	$ 156,812,000	$ 55,289,000	$ 43,132,000
DataSense LLC | Related Party
Related Party Transaction [Line Items]
Other assets current			0
Other liabilities current			0
DataSense LLC | Software Development Services Agreement
Related Party Transaction [Line Items]
Company paid		$ 1,900,000	$ 3,500,000
[1] Amounts include certain expenses incurred with related parties. Refer to Note 14 in the accompanying notes for details.

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended
	Jun. 30, 2022	Dec. 31, 2024	Nov. 07, 2024
Subsequent Event [Line Items]
Purchase commitment		$ 29,516
Consumption Agreement
Subsequent Event [Line Items]
Number of years for agreement	5 years
Purchase commitment	$ 300,000		$ 360,000