Mark C. Andersen Form 3/A FibroBiologics / Mark C. Andersen ownership change

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

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1. Name and Address of Reporting Person^*

Andersen Mark C.

(Last) (First) (Middle)

C/O FIBROBIOLOGICS, INC.

455 E. MEDICAL CENTER BLVD. SUITE 300

(Street)

HOUSTON TX 77598

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
01/24/2024

3. Issuer Name and Ticker or Trading Symbol
FibroBiologics, Inc. [ FBLG ]

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

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

5. If Amendment, Date of Original Filed (Month/Day/Year)
02/07/2024

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

X	Form filed by One Reporting Person
	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)

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
Stock Option (Right to Buy)	(1)	02/16/2033	Common Stock	455,750	2.28	D
Stock Option (Right to Buy)	(2)	09/25/2032	Common Stock	7,500	3.28	D

Explanation of Responses:

1. 1/4 of the options vested on January 1, 2024, with the remainder vesting monthly over 36 months.

2. 1/3 of the options vested on May 31, 2023, with 1/36th of the options vesting monthly thereafter until fully vested.

Remarks:

This amendment is filed to include stock options in Table II that were inadvertently omitted in the original filing.

	/s/ Mark Andersen	08/13/2024
	** 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).
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