John L. Slebir - 10 Feb 2026 Form 4 Insider Report for DYNAVAX TECHNOLOGIES CORP (DVAX)

Reporting relationship: SVP General Counsel
Issuer ticker: DVAX
Reported as of: 10 Feb 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 10 Feb 2026, 16:15:28 UTC
Prior SEC filing: 29 Dec 2025
Source filing: View source filing
Reporting owner signature: /s/ John L. Slebir

Key filing fact

John L. Slebir filed Form 4 for DYNAVAX TECHNOLOGIES CORP (DVAX) on 10 Feb 2026.

Key facts

This page summarizes John L. Slebir's Form 4 filing for DYNAVAX TECHNOLOGIES CORP (DVAX).
12 reported transactions and 7 derivative rows are listed below.
Accepted by SEC: 10 Feb 2026, 16:15.

Change

Previous filing in this sequence was filed on 29 Dec 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001475990 Primary reporting owner

Slebir John L

Relationship: SVP General Counsel
Address: C/O DYNAVAX TECHNOLOGIES, 2100 POWELL STREET, SUITE 720, EMERYVILLE
Signature: /s/ John L. Slebir
Signature date: 10 Feb 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

DVAX transaction

Common Stock

Disposition pursuant to a tender of shares in a change of control transaction

Transaction value
Shares: -69,634
Change %: -100%
Price
Shares after: 0
Date: 10 Feb 2026
Ownership: Direct
Footnotes: F1, F2, F3

DVAX transaction

Common Stock - Performance Stock Units

Award

Transaction value
Shares: +50,000
Change %
Price
Shares after: 50,000
Date: 10 Feb 2026
Ownership: Direct
Footnotes: F4

DVAX transaction

Common Stock - Performance Stock Units

Disposed to Issuer

Transaction value
Shares: -50,000
Change %: -100%
Price
Shares after: 0
Date: 10 Feb 2026
Ownership: Direct
Footnotes: F1, F2, F5

DVAX transaction

Common Stock - Performance Stock Units

Award

Transaction value
Shares: +42,424
Change %
Price
Shares after: 42,424
Date: 10 Feb 2026
Ownership: Direct
Footnotes: F6

DVAX transaction

Common Stock - Performance Stock Units

Disposed to Issuer

Transaction value
Shares: -42,424
Change %: -100%
Price
Shares after: 0
Date: 10 Feb 2026
Ownership: Direct
Footnotes: F1, F2, F5

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

DVAX transaction Derivative

Stock Option (Right to Buy)

Disposed to Issuer

Transaction value
Shares: -300,000
Change %: -100%
Price
Shares after: 0
Date: 10 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 300,000
Exercise price: $9.29
Footnotes: F1, F2, F7

DVAX transaction Derivative

Stock Option (Right to Buy)

Disposed to Issuer

Transaction value
Shares: -80,000
Change %: -100%
Price
Shares after: 0
Date: 10 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 80,000
Exercise price: $12.74
Footnotes: F1, F2, F7

DVAX transaction Derivative

Stock Option (Right to Buy)

Disposed to Issuer

Transaction value
Shares: -88,000
Change %: -100%
Price
Shares after: 0
Date: 10 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 88,000
Exercise price: $11.12
Footnotes: F1, F2, F7

DVAX transaction Derivative

Stock Option (Right to Buy)

Disposed to Issuer

Transaction value
Shares: -70,000
Change %: -100%
Price
Shares after: 0
Date: 10 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 70,000
Exercise price: $12.48
Footnotes: F1, F2, F7

DVAX transaction Derivative

Stock Option (Right to Buy)

Disposed to Issuer

Transaction value
Shares: -70,000
Change %: -100%
Price
Shares after: 0
Date: 10 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 70,000
Exercise price: $12.69
Footnotes: F1, F2, F7, F8

DVAX transaction Derivative

Restricted Stock Units

Disposed to Issuer

Transaction value
Shares: -16,666
Change %: -100%
Price
Shares after: 0
Date: 10 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 16,666
Exercise price
Footnotes: F1, F2, F9, F10

DVAX transaction Derivative

Restricted Stock Units

Disposed to Issuer

Transaction value
Shares: -28,283
Change %: -100%
Price
Shares after: 0
Date: 10 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 28,283
Exercise price
Footnotes: F1, F2, F10, F11

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Section 16 status

John L. Slebir is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may still apply in specific circumstances.

Explanation of responses 11 footnotes

Footnote F1

This Form 4 reports securities transacted pursuant to the Agreement and Plan of Merger (the "Merger Agreement") by and among the Issuer, SANOFI, a French societe anonyme ("Parent"), and Samba Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of Parent ("Purchaser").

Footnote F2

Pursuant to the Merger Agreement, Purchaser completed a tender offer to acquire all of the issued and outstanding shares of common stock of the Issuer, par value $0.001 per share (the "Common Stock"), for $15.50 per share (the "Offer Price"), in cash, without interest and subject to any applicable withholding of taxes. On February 10, 2026, Purchaser merged with and into the Issuer, with the Issuer surviving as an indirect wholly owned subsidiary of Parent (the effective time of such merger, the "Effective Time").

Footnote F3

Pursuant to the terms of the Merger Agreement, at the Effective Time, each share of Common Stock held by the Reporting Person was tendered in exchange for the Offer Price.

Footnote F4

Represents performance-based restricted stock units ("PSUs") previously granted to the Reporting Person in 2024, which 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, 2026.

Footnote F5

Pursuant to the terms of the Merger Agreement, at the Effective Time, each PSU award that was outstanding as of immediately prior to the Effective Time, whether vested or unvested, was cancelled and converted into the right to receive cash in an amount equal to (i) the number of shares issuable in settlement of such PSU award immediately prior to the Effective Time based on attainment of the performance goal at 150% of the target level, without regard to vesting, multiplied by (ii) the Offer Price, except that in the case of any PSU award that was granted in calendar year 2025, 50% of such cash amount is subject to vesting requirements and scheduled to vest 6 months after the Effective Time, as described in the Merger Agreement.

Footnote F6

Represents PSUs previously granted to the Reporting Person in 2025, which vest based on rTSR over a performance period ending on December 31, 2027.

Footnote F7

Pursuant to the terms of the Merger Agreement, (i) each stock option that was outstanding as of immediately prior to the Effective Time (other than a stock option granted in calendar year 2025 became fully vested immediately prior to the Effective Time, and (ii) at the Effective Time, each stock option that was outstanding as of immediately prior to the Effective Time was cancelled and converted into the right to receive cash in an amount equal to (i) the number of shares subject to such stock option immediately prior to the Effective Time, without regard to vesting, multiplied by (ii) the excess of the Offer Price over the exercise price per share of such stock option, except that in the case of any portion of a stock option granted in calendar year 2025 that remained unvested as of the immediately prior to the Effective Time, 50% of such cash amount is subject to vesting requirements and scheduled to vest 6 months after the Effective Time, as described in the Merger Agreement.

Footnote F8

The stock option was granted to the Reporting Person in 2025.

Footnote F9

The restricted stock units ("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.

Footnote F10

Pursuant to the terms of the Merger Agreement, at the Effective Time, each RSU award that was outstanding as of immediately prior to the Effective Time, whether vested or unvested, was cancelled and converted into the right to receive cash in an amount equal to (i) the number of shares issuable in settlement of such RSU award immediately prior to the Effective Time without regard to vesting, multiplied by (ii) the Offer Price, except that in the case of any portion of an RSU award granted in calendar year 2025 that remained unvested as of immediately prior to the Effective Time, 50% of such cash amount is subject to vesting requirements and scheduled to vest 6 months after the Effective Time, as described in the Merger Agreement.

Footnote F11

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.