Surrozen (SRZN) COO reports 1,666-share purchase under 2021 ESPP

Rhea-AI Filing Summary

Surrozen, Inc.'s Chief Operating Officer, Charles Williams, reported buying 1,666 shares of common stock on 12/15/2025 at $8.11 per share. This purchase brought his directly owned stake to 11,048 shares.

He is voluntarily reporting these shares, which were acquired under Surrozen's 2021 Employee Stock Purchase Plan. The transaction is noted as exempt from certain short-swing profit rules under Rule 16b-3(d) and Rule 16b-3(c), indicating a routine employee stock plan purchase by a senior executive.

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

OMB APPROVAL

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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^*

Williams Charles O

(Last) (First) (Middle)

C/O SURROZEN, INC.

171 OYSTER POINT BLVD., SUITE 400

(Street)

SOUTH SAN FRANCISCO CA 94080

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Surrozen, Inc./DE [ SRZN ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
12/15/2025

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

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 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
Common Stock	12/15/2025		A(1)		1,666	A	$8.11	11,048	D

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

Explanation of Responses:

1. This reporting person is voluntarily reporting these shares acquired under the Surrozen, Inc. 2021 Employee Stock Purchase Plan in transactions that were exempt under both Rule 16b-3(d) and Rule 16b-3(c).

	/s/ Charles Williams	12/16/2025
	** 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 4 (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.
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FAQ

What insider transaction did Surrozen (SRZN) report for its COO?

Surrozen's Chief Operating Officer, Charles Williams, reported acquiring 1,666 shares of Surrozen common stock on 12/15/2025 at a price of $8.11 per share.

How many Surrozen (SRZN) shares does Charles Williams own after this transaction?

Following the reported purchase, Charles Williams directly owns 11,048 shares of Surrozen, Inc. common stock.

Under what plan were the new Surrozen (SRZN) shares acquired?

The 1,666 shares were acquired under the Surrozen, Inc. 2021 Employee Stock Purchase Plan, as noted in the explanation of responses.

Was the COO’s Surrozen (SRZN) share purchase exempt under SEC rules?

Yes. The filing states that the shares were acquired in transactions that were exempt under both Rule 16b-3(d) and Rule 16b-3(c).

Is Charles Williams’ Surrozen (SRZN) ownership direct or indirect?

The Form 4 indicates that the 11,048 shares of Surrozen common stock are held with direct (D) ownership.

Is this Surrozen (SRZN) insider transaction part of a group filing?

No. The report specifies that the Form 4 is filed by one reporting person, not by more than one reporting person.