Ubs (AMUB) F-3/A Shelf registration (foreign) (amended)

Exhibit 5.2

UBS AG Bahnhofstrasse 45 8001 Zurich Switzerland Homburger AG Prime Tower Hardstrasse 201 CH–8005 Zurich   T +41 43 222 10 00 F +41 43 222 15 00 lawyers@homburger.ch         

Zurich, May 28, 2024

UBS AG

UBS AG – Registration Statement on Form F-3

We, Homburger AG, have acted as special Swiss counsel to UBS AG in connection with the registration statement on Form F-3 to be filed by UBS AG under the United States Securities Act of 1933, as amended (the Securities Act), with the U.S. Securities and Exchange Commission (the SEC) on or around May 31, 2024 (excluding the documents incorporated by reference therein and as amended through such date, the Registration Statement), for purposes, among other things, of registering on or after the Registration Statement Effective Date (as defined below) offerings by UBS AG, acting through either its head offices or one of its non-Swiss branches (any such branch, an Issuing Branch), of one or more series of senior debt securities to be issued by it on or after the Registration Statement Effective Date under the Indenture (as defined below) as supplemented by the Fourth Supplemental Indenture (as defined below) (any such debt securities, Debt Securities). As such counsel, we have been requested to give our opinion as to certain matters of Swiss law relating to the Registration Statement and the Debt Securities.

I. Basis of Opinion

This opinion is confined to and given on the basis of the laws of Switzerland in force at the date hereof. Such laws and the interpretation thereof are subject to change. This opinion is also confined to the matters stated herein and the Documents (as defined below), and is not to be read as extending, by implication or otherwise, to any agreement or other document referred to in any of the Documents or any other matter.

For purposes of this opinion, we have not conducted any due diligence or similar investigation as to factual circumstances that are or may be referred to in the Documents, and we express no opinion as to the accuracy of representations and warranties of facts set out in the Documents or the factual background assumed therein.

1/8

For purposes of this opinion, we have only reviewed the following documents (collectively, the Documents):

(i) an electronic copy of the Registration Statement (as amended through the date hereof);

(ii) an electronic copy of the executed indenture dated March 29, 2007 (the Base Indenture), between Credit Suisse AG and The Bank of New York Mellon (formerly known as The Bank of New York), as trustee (the Trustee);

(iii) an electronic copy of the executed first supplemental indenture to the Base Indenture dated May 6, 2008 (the First Supplemental Indenture), between Credit Suisse AG and the Trustee;

(iv) an electronic copy of the executed second supplemental indenture to the Base Indenture dated March 25, 2009 (the Second Supplemental Indenture), between Credit Suisse AG and the Trustee;

(v) an electronic copy of the executed third supplemental indenture to the Base Indenture dated September 9, 2020 (the Third Supplemental Indenture and, together with the Base Indenture, the First Supplemental Indenture and the Second Supplemental Indenture, the Indenture), between Credit Suisse AG and the Trustee;

(vi) an electronic copy of the form of fourth supplemental indenture (the Form of Fourth Supplemental Indenture), pursuant to which UBS AG will agree in accordance with Section 5.01 of the Indenture to, among other things, assume all the obligations of Credit Suisse AG under the Indenture with effect upon registration of the Merger (as defined below) with the Commercial Registers of the Canton of Zurich and the Canton of Basel-City in Switzerland (the date of such registration, Merger Effective Date);

(vii) a copy of the articles of association (Statuten) of UBS AG in their version dated as of April 23, 2024, certified by the Commercial Register of the Canton of Zurich in Switzerland (the Articles);

(viii) a certified excerpt from the Commercial Register of the Canton of Zurich in Switzerland for UBS AG, dated May 24, 2024 (the Excerpt);

(ix) an electronic copy of the organization regulations (Organisationsreglement) of UBS AG, valid as of March 1, 2024 (the March 2024 Organization Regulations);

(x) an electronic copy of the organization regulations (Organisationsreglement) of UBS AG, valid as of May 1, 2024 (the Organization Regulations);

(xi) an electronic copy of the UBS Delegation of Authorities Group Finance (including Group Treasury) 9-C-011610 in its version effective as of October 25, 2023 (the Delegation);

2/8

(xii) an electronic copy of the Policy on Signing Authority 1-P-000052 in its version effective as of December 14, 2023 (the Signing Authority Policy);

(xiii) an electronic copy of the authorisation signed by a managing director and an executive director of UBS AG dated May 13, 2024, delegating authority to negotiate, jointly execute and deliver, on behalf of UBS AG (whether acting through its head offices or through one of its branches), documents in connection with, among other things, the assumption by UBS AG of Credit Suisse AG’s obligations under the Indenture to any two signatories either registered from time to time in the Commercial Registers of the Canton of Zurich or Basel-City in Switzerland as signatories for UBS AG or listed in such authorisation (the Power of Attorney);

(xiv) an electronic copy of the resolutions of the Group Treasurer and the Group Chief Financial Officer, dated April 25, 2024, relating to, among other things, the filing of the Registration Statement and the offering and issuance of the Debt Securities, and delegating authority to, among other things, sign and enter into on behalf of UBS AG any documents and take any other actions on behalf of UBS AG authorized by such resolutions (or that are necessary or appropriate in furtherance of any actions authorized by such resolutions) to any two “Authorized Officers” listed in Schedule I to such resolutions (the Resolutions); and

(xv) an electronic copy of the executed merger agreement dated December 7, 2023, as amended and restated on April 30, 2024 (the Merger Agreement), between UBS AG and Credit Suisse AG.

No documents have been reviewed by us in connection with this opinion other than the Documents. Accordingly, we shall limit our opinion to the Documents and their legal implications under Swiss law.

In this opinion, Swiss legal concepts are expressed in English terms and not in their original language. These concepts may not be identical to the concepts described by the same English terms as they exist under the laws of other jurisdictions. With respect to Documents governed by laws other than the laws of Switzerland, for purposes of this opinion we have relied on the plain meaning of the words and expressions contained therein without regard to any import they may have under the relevant governing law.

II. Assumptions

In rendering the opinion below, we have assumed the following:

(a) all documents produced to us as originals are authentic and complete, and all documents produced to us as copies (including, without limitation, fax and electronic copies) conform to the original;

(b) all documents produced to us as originals and the originals of all documents produced to us as copies were duly executed and certified, as applicable, by the individuals purported to have executed or certified, as the case may be, such documents, and any electronic signature of UBS AG (whether acting through its head offices or through one of its branches) on any such document has been affixed thereto by the individual to whom such electronic signature belongs and such signature has not been removed or otherwise altered in any way;

3/8

(c) except as expressly opined upon herein, all information and confirmations contained in the Documents is, and all material statements (except as to Swiss law) made to us in connection with the Documents are, true and accurate;

(d) as far as any obligation under or in connection with the Registration Statement and the Debt Securities is required to be performed in, or by a party organized under the laws of, any jurisdiction outside of Switzerland, its performance will not be illegal or unenforceable by virtue of the laws of such jurisdiction;

(e) the Debt Securities will not be (i) publicly offered, directly or indirectly, in Switzerland within the meaning of article 3(h) of the Swiss Financial Services Act of June 15, 2018, as amended, and/or (ii) admitted to trading on a trading venue (exchange or multilateral trading facility) in Switzerland, and any offering of Debt Securities will be conducted in the manner described in the Registration Statement;

(f) the Indenture is within the capacity and power of, has been duly authorized, executed and delivered by, and is binding on, all parties thereto (other than UBS AG);

(g) the Form of Fourth Supplemental Indenture will be executed in the form reviewed by us (as so executed, the Fourth Supplemental Indenture);

(h) the Fourth Supplemental Indenture will (i) be dated as of a date prior to the Merger Effective Date and prior to the Registration Statement Effective Date (as defined below), (ii) be executed and delivered on behalf of UBS AG by two persons listed in the Power of Attorney, and (iii) as from its date, be within the capacity and power of, have been duly authorized, executed and delivered by, and be binding on, the Trustee and Credit Suisse AG;

(i) each issuance of individual Debt Securities will be approved in accordance with the Organization Regulations and the Delegation, each as may be amended from time to time;

(j) with respect to individual Debt Securities to be issued by UBS AG, acting through an Issuing Branch, (i) each of UBS AG and such Issuing Branch has the requisite power and authority under the laws of the jurisdiction in which such Issuing Branch is domiciled (the Relevant Jurisdiction) to act as provided in such Debt Securities and all other relevant documents, (ii) UBS AG is licensed in the Relevant Jurisdiction to operate such Issuing Branch, (iii) such Issuing Branch has complied and will comply with all internal guidelines, and any requirements of the Relevant Jurisdiction, applicable to such Issuing Branch with respect to the issuance of such Debt Securities, and (iv) as a matter of the laws of the Relevant Jurisdiction with respect to the issuance of such Debt Securities, the obligations entered into by such Issuing Branch are automatically those of UBS AG itself;

(k) the Registration Statement will be executed and filed with the SEC in the form reviewed by us, and will become effective under the Securities Act (the date of such effectiveness, the Registration Statement Effective Date), (i) prior to the issuance of Debt Securities by UBS AG (whether acting through its head offices or one of its branches), and (ii) on or after the Merger Effective Date (but following the effectiveness of the Merger);

4/8

(l) prior to the Registration Statement Effective Date, the Registration Statement has been executed by any two officers identified as “Authorized Officers” in Schedule I to the Resolutions and as required by the Securities Act and the rules and regulations promulgated thereunder;

(m) the Articles, the Organization Regulations, the Delegation, the Signing Authority Policy and the Power of Attorney are in full force and effect and have not been amended, and will remain in full force and effect and not be amended to the extent that they affect the signatory authority granted to any officer identified as an “Authorized Officers” in Schedule I to the Resolutions (as such Schedule I may be amended from time to time in accordance with the terms of the Resolutions);

(n) the March 2024 Organization Regulations were in full force and effect and had not been amended as at the date of the Resolutions;

(o) the Excerpt is correct, complete and up-to-date;

(p) the Resolutions are and will remain in full force and effect and have not been and (other than any amendments to the list of officers identified as “Authorized Officers” in Schedule I thereto that are made in accordance with the terms of the Resolutions) will not be amended;

(q) the issuance of Debt Securities to be issued and sold from time to time does not and will not lead to a violation by UBS AG of applicable bank regulatory capital adequacy rules;

(r) the aggregate issuance amount, as measured by the aggregate initial public offering price, of securities registered pursuant to the Registration Statement (including the Debt Securities) will at no time exceed USD 1.5 billion in accordance with the Resolutions (the Size Limitation); provided, however, that the aggregate issuance amount of securities issued pursuant to the Registration Statement may exceed the Size Limitation if at or prior to the issuance of any securities in excess of the Size Limitation, an increase in the Size Limitation greater than or equal to the amount by which such securities exceed the Size Limitation has been duly authorized by or on behalf of UBS AG in accordance with then applicable mandatory Swiss law and corporate rules and guidelines;

(s) the Merger Agreement is (i) within the capacity and power of, has been duly authorized, executed and delivered by, and is binding on, all parties thereto, and (ii) in full force and effect and has not been amended and will not be terminated on or prior to the Merger Effective Date; and

(t) when the Merger (as defined below) is registered with the Commercial Registers of the Canton of Zurich and the Canton of Basel-City in Switzerland on the Merger Effective Date, it will become effective in accordance with the terms and conditions of the Merger Agreement.

5/8

III. Opinion

Based on the foregoing and subject to the qualifications set out below, we are of the opinion that:

1. UBS AG is a corporation (Aktiengesellschaft) duly incorporated and validly existing under the laws of Switzerland.

2. UBS AG has taken all necessary corporate action to authorize the issuance and sale of the Debt Securities and the execution of any documents in connection therewith in conformity with the Articles, the Organization Regulations and the Delegation as a matter of Swiss law.

3. If and when (i) the Registration Statement has become effective under the Securities Act, (ii) the terms of any Debt Securities and of their issuance and sale have been duly established in conformity with the Indenture as supplemented by the Fourth Supplemental Indenture and as may be further supplemented from time to time generally or in relation to such Debt Securities and any relevant prospectus supplement so as not to violate Swiss law, (iii) the terms, issuance and sale of such Debt Securities have been approved by any two officers identified as “Authorized Officers” in Schedule I to the Resolutions (as such Schedule I may have been amended from time to time in accordance with the terms of the Resolutions on or prior to the time of such approval), and (iv) such Debt Securities have been duly executed and duly authenticated in accordance with the Indenture as supplemented by the Fourth Supplemental Indenture and as may be further supplemented from time to time generally or in relation to such Debt Securities and issued and sold as contemplated in the Registration Statement and any relevant prospectus supplement, and assuming the validity of such Debt Securities and the legally binding nature of the payment obligations expressed to be assumed by UBS AG under such Debt Securities under the laws of the State of New York (which is the law by which they are expressed to be governed), the payment obligations expressed to be assumed by UBS AG under such Debt Securities will constitute valid and legally binding obligations of UBS AG, subject to bankruptcy, insolvency, reorganization, banking supervision and similar laws and principles of general applicability relating to or affecting creditors’ rights, subject to general principles of equity (including the principle of good faith) under Swiss law and subject to Swiss public policy.

IV. Qualifications

The above opinions are subject to the following qualifications:

(a) The lawyers of our firm are members of the Zurich bar and do not hold themselves out to be experts in any laws other than the laws of Switzerland. Accordingly, we are opining herein as to Swiss law only, based on our independent professional judgment, and we express no opinion with respect to the applicability or the effect of the laws of any other jurisdiction to or on the matters covered herein.

(b) Rights and claims may become barred under statutes of limitation or prescription, or may be or become subject to available defenses such as set-off, counterclaim, misrepresentation, material error, frustration, overreaching, duress or fraud. Further, (i) limitations may apply to any provision in any Debt Security or the Indenture as supplemented by the Fourth Supplemental Indenture (and as may be further supplemented from time to time) that limits the liability of any party thereto or provides for indemnification or contribution obligations of UBS AG, if a Swiss court finds that such party or the indemnified person, respectively, acted

6/8

willfully or negligently, and (ii) any party’s obligation to pay an amount under such Debt Security or the Indenture as so supplemented may be unenforceable if a Swiss court finds that such amount constitutes an excessive penalty (such as exemplary or punitive damages).

(c) Pursuant to Swiss law, any mandate, power of attorney or instruction provided to, or appointment of, an agent may be terminated at any time by the principal or the agent, notwithstanding such mandate, power of attorney, instruction or appointment being stated to be irrevocable.

(d) A Swiss court may limit or decline to give effect to an indemnity for legal fees or costs incurred.

(e) Swiss courts interpret and construe an agreement in accordance with the principle of good faith (Vertragsauslegung nach Treu und Glauben) and, in doing so, may consider elements in addition to the wording of the relevant provisions of such agreement, including, without limitation, the circumstances under which such agreement was entered into and the real intention of the parties thereto as mutually understood or as to be understood in good faith.

(f) The Indenture as supplemented by the Fourth Supplemental Indenture provides for the obligation of UBS AG to pay additional amounts to the extent withholding tax is imposed on any payments under such agreements and securities. Such obligations may – if the payments were classified by the Swiss federal tax administration as made by an entity resident or situated in Switzerland for Swiss taxation purposes – violate Article 14 of the Swiss Federal Withholding Tax Act of October 13, 1965 which stipulates that (i) Swiss withholding tax (Verrechnungssteuer) to be withheld from any payment must be charged to the recipient of the payment, and (ii) contradictory agreements are null and void as to this issue.

(g) We express no opinion as to (i) the accuracy or completeness of the information set out in the Registration Statement, or (ii) whether any statement of a material fact in the Registration Statement or omission to state a material fact necessary in order to make the statements in the Registration Statement is misleading.

(h) We express no opinion as to tax or banking regulatory matters. Further, we express no opinion on any commercial, accounting, calculating, auditing or other non-legal matter.

(i) We express no opinion on the Merger Agreement.

(j) Pursuant to the terms of the Merger Agreement, UBS AG and Credit Suisse AG have agreed to a merger by absorption under Swiss law (Absorptionsfusion), whereby Credit Suisse AG will be absorbed by UBS AG (the Merger) and, effective upon registration of the Merger with the Commercial Registers of the Canton of Zurich and the Canton of Basel-City in Switzerland on the Merger Effective Date, Credit Suisse AG will cease to exist and all of its assets, liabilities and contracts will automatically transfer to, and be absorbed and taken over by, UBS AG by operation of Swiss law (Universalsukzession).

* * *

7/8

We have issued this opinion as of the date hereof and we assume no obligation to advise you of any changes in fact or in law that are made or brought to our attention hereafter.

We hereby consent to the filing of this opinion with the SEC as an exhibit to the Registration Statement and to the use of our name in the prospectus included in the Registration Statement under the heading “Validity of the Securities”. In giving such consent we do not admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act.

This opinion is furnished by us, as special Swiss counsel to UBS AG, in connection with the filing of the Registration Statement and, except as provided in the immediately preceding paragraph, is not to be used, circulated, quoted or otherwise referred to for any other purpose without our express written permission, or relied upon by any other person.

This opinion is governed by and shall be construed in accordance with the laws of Switzerland. We confirm our understanding that all disputes arising out of or in connection with this opinion shall be subject to the exclusive jurisdiction of the courts of the Canton of Zurich, Switzerland, venue being the city of Zurich.

Sincerely yours,

/s/ Homburger AG

HOMBURGER AG

8/8