Major Zura Bio (ZURA) holder acquires 2M shares in registered deal

Rhea-AI Filing Summary

Zura Bio Ltd reported that affiliated entity AI Biotechnology LLC, a 10% owner, bought 2,000,000 Class A Ordinary Shares of Zura Bio.

The shares were acquired at $6.25 per share in a registered offering by the company, increasing AI Biotechnology LLC’s direct holdings to 6,552,725 shares. Related entities, including Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik, may be deemed beneficial owners through their control structure but each disclaims beneficial ownership beyond any pecuniary interest.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

AI Biotechnology LLC

(Last) (First) (Middle)

C/O ACCESS INDUSTRIES, INC.

40 WEST 57TH STREET, 28TH FLOOR

(Street)

NEW YORK NY 10019

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
02/26/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	02/26/2026		P(1)		2,000,000(1)	A	$6.25	6,552,725	D(2)

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

1. Name and Address of Reporting Person^*

AI Biotechnology LLC

(Last) (First) (Middle)

C/O ACCESS INDUSTRIES, INC.

40 WEST 57TH STREET, 28TH FLOOR

(Street)

NEW YORK NY 10019

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Access Industries Holdings LLC

(Last) (First) (Middle)

C/O ACCESS INDUSTRIES, INC.

40 WEST 57TH STREET, 28TH FLOOR

(Street)

NEW YORK NY 10019

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

ACCESS INDUSTRIES MANAGEMENT, LLC

(Last) (First) (Middle)

C/O ACCESS INDUSTRIES, INC.

40 WEST 57TH STREET, 28TH FLOOR

(Street)

NEW YORK NY 10019

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Blavatnik Len

(Last) (First) (Middle)

C/O ACCESS INDUSTRIES, INC.

40 WEST 57TH STREET, 28TH FLOOR

(Street)

NEW YORK NY 10019

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. Shares of Class A Ordinary Shares acquired pursuant to a registered offering of Class A Ordinary Shares by the Issuer.

2. 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.

	/s/ Alejandro Moreno for AI Biotechnology LLC	03/02/2026
	/s/ Alejandro Moreno for Access Industries Holdings LLC	03/02/2026
	/s/ Alejandro Moreno for Access Industries Management, LLC	03/02/2026
	/s/ Alejandro Moreno, as Attorney-in-Fact for Mr. Blavatnik	03/02/2026
	** Signature of Reporting Person	Date
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FAQ

What insider transaction did Zura Bio (ZURA) report in this Form 4?

Zura Bio reported that AI Biotechnology LLC acquired 2,000,000 Class A Ordinary Shares. The purchase increased its direct holdings to 6,552,725 shares, reflecting a significant additional investment by a 10% beneficial owner associated with Access Industries entities and Len Blavatnik.

At what price were the new Zura Bio (ZURA) shares purchased?

The 2,000,000 Class A Ordinary Shares were acquired at $6.25 per share. This price comes from a registered offering by Zura Bio, rather than open-market trading, indicating participation in a primary share issuance by the company.

Who is the primary holder of the Zura Bio (ZURA) shares reported in this Form 4?

The securities are held directly by AI Biotechnology LLC. Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik may be deemed beneficial owners through control relationships but each disclaims beneficial ownership beyond any pecuniary interest.

How many Zura Bio (ZURA) shares does AI Biotechnology LLC own after this transaction?

After acquiring 2,000,000 additional shares, AI Biotechnology LLC holds 6,552,725 Class A Ordinary Shares. This figure reflects its direct ownership position following participation in the registered offering disclosed in the Form 4 filing.

How are Access Industries and Len Blavatnik connected to the Zura Bio (ZURA) shares?

Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik may be deemed beneficial owners because of their control over AI Biotechnology LLC. However, each party disclaims beneficial ownership of the reported securities beyond its or his pecuniary interest.

Was the Zura Bio (ZURA) insider transaction an open-market trade or part of an offering?

The shares were acquired pursuant to a registered offering of Class A Ordinary Shares by Zura Bio. This means AI Biotechnology LLC bought directly in a company share issuance, rather than acquiring the stock through open-market purchases on an exchange.