Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN 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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(Print or Type Responses)

1. Name and Address of Reporting Person * Novack David F 2. Issuer Name and Ticker or Trading Symbol DYNAVAX TECHNOLOGIES CORP [DVAX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President & COO (Last) (First) (Middle) C/O DYNAVAX TECHNOLOGIES, 2100 POWELL STREET, SUITE 720 3. Date of Earliest Transaction (Month/Day/Year) 12/23/2025 (Street) EMERYVILLE, CA 94608 4. If Amendment, Date 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 (City) (State) (Zip) 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 12/23/2025 A(1) 60,625 A (2) 70,043(3) D Common Stock 12/23/2025 M(1) 22,620 A (4) 92,663(3) D Common Stock 12/23/2025 M(1) 18,788 A (4) 111,451(3) D Common Stock 12/24/2025 M(5) 20,000 A $6.805 131,451(3) D Common Stock 12/24/2025 M(5) 10,000 A $10.47 141,451(3) D Common Stock 12/24/2025 S(5) 30,000 D $15.49 111,451(3) D Common Stock 12/24/2025 F 48,107(6) D $15.38 63,344(3) D

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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 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

Restricted Stock Unit

(7)

12/23/2025

M(1)

22,620

(7)

(7)

Common Stock

22,620

(4)

22,620

D

Restricted Stock Unit

(8)

12/23/2025

M(1)

18,788

(8)

(8)

Common Stock

18,788

(4)

37,576

D

Stock Option (Right to Buy)

$6.805

12/24/2025

M(5)

20,000

(9)

12/15/2026

Common Stock

20,000

(10)

166,528

D

Stock Option (Right to Buy)

$10.47

12/24/2025

M(5)

10,000

(9)

02/21/2026

Common Stock

10,000

(10)

85,655

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Novack David F C/O DYNAVAX TECHNOLOGIES 2100 POWELL STREET, SUITE 720 EMERYVILLE, CA 94608			President & COO

Signatures

David F. Novack, by /s/ Trevor Dutcher, Attorney-in-Fact		12/29/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	On December 23, 2025 (the "Effective Date"), in connection with the execution of an Agreement and Plan of Merger dated as of the Effective Date (the "Merger Agreement") by and among the Issuer, SANOFI, a French societe anonyme ("Parent"), and Samba Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Parent, the Board of Directors of the Issuer approved acceleration of vesting of certain performance-based restricted stock units ("PSUs") and restricted stock units ("RSUs") previously granted to the Reporting Person, effective as of the Effective Date.
(2)	Represents PSUs previously granted to the Reporting Person that vest based on how the Issuer's total stockholder return compares to the total stockholder return of an indexed group of companies ("rTSR") over a performance period ending on December 31, 2025. Each PSU represents a contingent right to receive one share of common stock. On the Effective Date, the Board of Directors of the Issuer determined that these PSUs (which represent 125% of the target number of PSUs) were earned according to achievement of the rTSR performance condition over a shortened performance period, with the Issuer's total stockholder return determined based on the amount payable for a share of the Issuer's common stock pursuant to the Merger Agreement ($15.50), and approved such acceleration of vesting of the earned PSUs.
(3)	Includes 1,340 shares purchased through the Issuer's Employee Stock Purchase Plan on August 15, 2025.
(4)	Each RSU represents a contingent right to receive one share of the Issuer's common stock.
(5)	The sales reported on this Form 4 were effected pursuant to a 10b5-1 trading plan adopted on December 6, 2024.
(6)	Shares withheld by the Issuer to satisfy tax withholding requirements on vesting of PSUs and RSUs.
(7)	The RSUs were granted on February 15, 2024, and were originally scheduled to vest over three years, with 1/3 vesting on each anniversary of February 15, 2024.
(8)	The RSUs were granted on February 13, 2025, and were originally scheduled to vest over three years, with 1/3 vesting on each anniversary of February 13, 2025.
(9)	Fully vested.
(10)	Not applicable.

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