Sec Form 3 Filing - AI Biotechnology LLC @ Zura Bio Ltd - 2025-05-21

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person AI Biotechnology LLC 2. Issuer Name and Ticker or Trading Symbol Zura Bio Ltd [ ZURA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O ACCESS INDUSTRIES, INC., 40 WEST 57TH STREET, 28TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 05/21/2025 (Street) NEW YORK, NY10019 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Ordinary Shares 4,552,725 D ( 1 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Warrant (right to buy) $ 0.001 ( 2 ) ( 2 ) Class A Ordinary Shares 13,146,346 D ( 1 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other AI Biotechnology LLC C/O ACCESS INDUSTRIES, INC. 40 WEST 57TH STREET, 28TH FLOOR NEW YORK, NY10019 X Access Industries Holdings LLC C/O ACCESS INDUSTRIES, INC. 40 WEST 57TH STREET, 28TH FL NEW YORK, NY10019 X ACCESS INDUSTRIES MANAGEMENT, LLC C/O ACCESS INDUSTRIES, INC. 40 WEST 57TH STREET, 28TH FLOOR NEW YORK, NY10019 X Blavatnik Len C/O ACCESS INDUSTRIES, INC. 40 WEST 57TH STREET, 28TH FL NEW YORK, NY10019 X Signatures /s/ Alejandro Moreno for AI Biotechnology LLC 05/28/2025 Signature of Reporting Person Date /s/ Alejandro Moreno for Access Industries Holdings LLC 05/28/2025 Signature of Reporting Person Date /s/ Alejandro Moreno for Access Industries Management, LLC 05/28/2025 Signature of Reporting Person Date /s/ Alejandro Moreno as Attorney-in-Fact for Mr. Blavatnik 05/28/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The securities reported are held directly by AI Biotechnology LLC ("AIB") and may be deemed to be beneficially owned by Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik because (i) Mr. Blavatnik controls AIM and AIH, (ii) AIM controls AIH, and (iii) AIH owns all of the voting units of AIB. Each of AIH, AIM and Mr. Blavatnik, and each of their affiliated entities and the officers, partners, members and managers thereof, disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form. ( 2 )Each whole pre-funded warrant entitles AIB to purchase one Class A Ordinary Share at an exercise price equal to $0.001 per share, and may be exercised at any time or times on or after the date of issuance, subject to the Beneficial Ownership Blocker (as defined herein). The pre-funded warrants are not exercisable to the extent that the aggregate number of Class A Ordinary Shares beneficially owned by AIB immediately following such exercise would exceed 9.99% of the Class A Ordinary Shares outstanding, as calculated under Rule 13d-3 of the Securities Exchange Act of 1934, as amended; provided, however, that AIB may increase or decrease the beneficial ownership limitation by giving notice to the Issuer (such notice not to be effective until the sixty-first day after the notice is delivered to the Issuer), but not to exceed any percentage in excess of 19.99% (such limitations, the "Beneficial Ownership Blocker").

Remarks: Exhibit List: Ex.24 - Power of Attorney

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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