Hemab Therapeutics holder reports 4,876,344 shares

Hemab Therapeutics Holdings, Inc. reported initial insider holdings for major shareholder AI DEN-MAB LLC.

Rhea-AI Filing Summary

Hemab Therapeutics Holdings, Inc. reported initial insider holdings for major shareholder AI DEN-MAB LLC. AI DEN-MAB LLC directly holds 4,876,344 shares of Common Stock as of May 4, 2026, establishing it as a significant owner.

According to the disclosure, these securities may be deemed beneficially owned by AI Biotechnology LLC, Access Industries Holdings LLC, Access Industries Management, LLC and Len Blavatnik through their control relationships. Each of these parties disclaims beneficial ownership beyond its or his pecuniary interest.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider AI DEN-MAB LLC, AI Biotechnology LLC, Access Industries Holdings LLC, ACCESS INDUSTRIES MANAGEMENT, LLC, Blavatnik Len

Role 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner

Type	Security	Shares	Price	Value
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 4,876,344 shares (Direct)

Footnotes (1)

1. F1. The securities reported are held directly by AI DEN-MAB LLC ("AI DMAB") and may be deemed to be beneficially owned by AI Biotechnology LLC ("AIB"), 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 AIB, (iii) AIH owns all of the voting units of AIB, and (iv) AIB owns all of the voting units of AI DMAB. Each of AIH, AIB, 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.

Key Figures

Common Stock held: 4,876,344 shares

1 metrics

Common Stock held 4,876,344 shares Directly held by AI DEN-MAB LLC as of May 4, 2026

Key Terms

beneficially owned, pecuniary interest, disclaims beneficial ownership, voting units

4 terms

beneficially owned financial

"may be deemed to be beneficially owned by AI Biotechnology LLC ("AIB"), Access Industries Holdings LLC ("AIH"), Access Industries Management, LLC ("AIM") and Len Blavatnik"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

pecuniary interest financial

"disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein"

disclaims beneficial ownership financial

"disclaims beneficial ownership of these securities, except to the extent of its or his pecuniary interest therein"

voting units financial

"AIH owns all of the voting units of AIB, and (iv) AIB owns all of the voting units of AI DMAB"

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/14/2026 - 04:05 PM Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

AI DEN-MAB LLC

(Last) (First) (Middle)

C/O ACCESS INDUSTRIES, INC.

40 WEST 57TH STREET, 28TH FLOOR

(Street)

NEW YORK NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
05/04/2026

3. Issuer Name and Ticker or Trading Symbol
Hemab Therapeutics Holdings, Inc. [ COAG ]

3a. Foreign Trading Symbol

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

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

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

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	4,876,344	D(1)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

AI DEN-MAB LLC

(Last) (First) (Middle)

C/O ACCESS INDUSTRIES, INC.

40 WEST 57TH STREET, 28TH FLOOR

(Street)

NEW YORK NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

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^*

AI Biotechnology LLC

(Last) (First) (Middle)

C/O ACCESS INDUSTRIES, INC.

40 WEST 57TH STREET, 28TH FLOOR

(Street)

NEW YORK NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

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 NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

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 NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

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 NEW YORK 10019

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

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

Explanation of Responses:

1. The securities reported are held directly by AI DEN-MAB LLC ("AI DMAB") and may be deemed to be beneficially owned by AI Biotechnology LLC ("AIB"), 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 AIB, (iii) AIH owns all of the voting units of AIB, and (iv) AIB owns all of the voting units of AI DMAB. Each of AIH, AIB, 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.

Remarks:

Ex-24 - Power of Attorney

	/s/ Alejandro Moreno for AI DEN-MAB LLC	05/14/2026
	/s/ Alejandro Moreno for AI Biotechnology LLC	05/14/2026
	/s/ Alejandro Moreno for Access Industries Holdings LLC	05/14/2026
	/s/ Alejandro Moreno for Access Industries Management, LLC	05/14/2026
	/s/ Alejandro Moreno, as Attorney-in-Fact for Mr. Blavatnik	05/14/2026
	** Signature of Reporting Person	Date
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 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)