# EDGAR Filing Document

**Accession Number:** 0001029142
**File Stem:** 0001193125-26-043821
**Filing Date:** 2026-2
**Character Count:** 112010
**Document Hash:** 52543a663c71ef704799ad8772cc5b67
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-043821.hdr.sgml**: 20260210

**ACCESSION NUMBER**: 0001193125-26-043821

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 17

**CONFORMED PERIOD OF REPORT**: 20260210

**ITEM INFORMATION**: Entry into a Material Definitive Agreement

**ITEM INFORMATION**: Termination of a Material Definitive Agreement

**ITEM INFORMATION**: Completion of Acquisition or Disposition of Assets

**ITEM INFORMATION**: Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing

**ITEM INFORMATION**: Material Modifications to Rights of Security Holders

**ITEM INFORMATION**: Changes in Control of Registrant

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260210

**DATE AS OF CHANGE**: 20260210

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** DYNAVAX TECHNOLOGIES CORP
- **CENTRAL INDEX KEY:** 0001029142
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 330728374
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-34207
- **FILM NUMBER:** 26613751

**BUSINESS ADDRESS:**
- **STREET 1:** 2100 POWELL STREET
- **STREET 2:** SUITE 720
- **CITY:** EMERYVILLE
- **STATE:** CA
- **ZIP:** 94608
- **BUSINESS PHONE:** 5108485100

**MAIL ADDRESS:**
- **STREET 1:** 2100 POWELL STREET
- **STREET 2:** SUITE 720
- **CITY:** EMERYVILLE
- **STATE:** CA
- **ZIP:** 94608

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d)

#### of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): February 10, 2026

## Dynavax Technologies Corporation

#### (Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-34207** | **33-0728374** |
| **(State or other jurisdiction**<br> **of incorporation)** | **(Commission**<br> **File Number)** | **(I.R.S. Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **2100 Powell Street, Suite 720** |  |
| **Emeryville, CA** | **94608** |
| **(Address of principal executive offices)** | **(Zip Code)** |

---

#### Registrant's telephone number, including area code: (510) 848-5100

#### N/A

#### (Former Name or Former Address, if Changed Since Last Report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading<br>Symbol(s)** | **Name of each exchange**<br> **on which registered** |
| Common Stock, Par Value $0.001 Per Share | DVAX | Nasdaq Global Select Market |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

------

#### INTRODUCTORY NOTE
As previously disclosed in the Current Report on Form 8-K filed with the Securities and Exchange Commission ("**SEC**") by Dynavax Technologies Corporation, a Delaware corporation (the "**Company**") on December 29, 2025, the Company entered into an Agreement and Plan of Merger, dated December 23, 2025 (the "**Merger Agreement**"), with SANOFI, a French *société anonyme* ("**Parent**"), and Samba Merger Sub, Inc., a Delaware corporation and an indirect wholly owned subsidiary of Parent ("**Purchaser**"). Pursuant to the Merger Agreement, on January 12, 2026, Purchaser commenced a tender offer to acquire all of the outstanding shares of common stock of the Company, par value $0.001 per share (the "**Shares**"), for $15.50 per Share (the "**Offer Price**"), in cash, without interest and subject to any applicable withholding of taxes, upon the terms and subject to the conditions set forth in the Offer to Purchase, dated January 12, 2026 (as it may be amended or supplemented from time to time, the "**Offer to Purchase**") and in the related Letter of Transmittal (as it may be amended or supplemented from time to time, the "**Letter of Transmittal**," together with the Offer to Purchase, the "**Offer**"). The Offer to Purchase and the Letter of Transmittal were filed as Exhibits (a)(1)(A) and (a)(1)(B), respectively, to the Tender Offer Statement on Schedule TO, originally filed with the SEC by Purchaser, Parent and Genzyme Corporation, a Massachusetts corporation, on January 12, 2026.

---

| | |
|:---|:---|
| **Item 1.01** | **Entry into a Material Definitive Agreement**  |

---

On the February 10, 2026 (the "**Closing Date**"), (i) the Company and U.S. Bank Trust Company, National Association (as successor in interest to U.S. Bank National Association), as trustee (the "**2026 Trustee**"), entered into a First Supplemental Indenture (the "**2026 Supplemental Indenture**"), which supplements the Indenture, dated as of May 13, 2021 (the "**Original 2026 Indenture**", as supplemented by the 2026 Supplemental Indenture, the "**2026 Indenture**"), by and between the Company and the 2026 Trustee, governing the Company's 2.50% Convertible Senior Notes due 2026 (the "**2026 Notes**"), of which approximately $40.2 million aggregate principal amount was outstanding on the Closing Date, and (ii) the Company and U.S. Bank Trust Company, National Association, as trustee (the "**2030 Trustee**"), entered into a First Supplemental Indenture (the "**2030 Supplemental Indenture**" and together with the 2026 Supplemental Indenture, the "**Supplemental Indentures**"), which supplements the Indenture, dated as of March 13, 2025 (the "**Original 2030 Indenture**", as supplemented by the 2030 Supplemental Indenture, the "**2030 Indenture**" and together with the 2026 Indenture, the "**Indentures**"), by and between the Company and the 2030 Trustee, governing the Company's 2.00% Convertible Senior Notes due 2030 (the "**2030 Notes**" and together with the 2026 Notes, the "**Notes**"), of which $225.0 million aggregate principal amount was outstanding on the Closing Date.

As a result of the Merger (as defined below), and pursuant to the 2026 Supplemental Indenture, at and after the Effective Time (as defined below), the 2026 Supplemental Indenture provides (with all terms used in this paragraph but not otherwise defined in this Form 8-K being as defined in the 2026 Indenture): (a) the right to convert each $1,000 principal amount of 2026 Notes was changed into a right to convert such principal amount of 2026 Notes into the Reference Property, which Reference Property is an amount of cash equal to the Conversion Rate in effect on the relevant Conversion Date (subject to any adjustment pursuant to the 2026 Indenture, including any increase as a result of a Make-Whole Fundamental Change) multiplied by $15.50 (which is an amount equal to the Offer Price); and a unit of Reference Property under the 2026 Indenture is comprised of an amount of cash equal to $15.50; (b) the Company will satisfy its Conversion Obligation by paying cash to the converting Holders on the second Business Day immediately following the relevant Conversion Date; (c) the Conversion rate will be adjusted in the same manner as, and at the same time and for the same events for which, the Conversion Rate is adjusted pursuant to Section 14.04 of the 2026 Indenture in a manner consistent with Section 14.07 of the 2026 Indenture; and (d) the Daily VWAP of a unit of Reference Property will be $15.50.

As a result of the Merger, and pursuant to the 2030 Supplemental Indenture, at and after the Effective Time, the 2030 Supplemental Indenture provides (with all terms used in this paragraph but not otherwise defined in this Form 8-K being as defined in the 2030 Indenture): (a) the right to convert each $1,000 principal amount of 2030 Notes was changed into a right to convert such principal amount of 2030 Notes into an amount of cash equal to the Conversion Rate in effect on the relevant Conversion Date (subject to any adjustment pursuant to the 2030 Indenture, including any increase as a result of a Make-Whole Fundamental Change) multiplied by $15.50 (which is an amount equal to the Offer Price); and a unit of Reference Property under the 2030 Indenture is comprised of an amount of cash equal to $15.50; (b) the Company will satisfy its Conversion Obligation by paying cash to the

------

converting Holders on the second Business Day immediately following the relevant Conversion Date; (c) the Conversion rate will be adjusted in the same manner as, and at the same time and for the same events for which, the Conversion Rate is adjusted pursuant to Section 14.04 of the 2030 Indenture in a manner consistent with Section 14.07 of the 2030 Indenture; and (d) the Daily VWAP of a unit of Reference Property will be $15.50.

The consummation of the Merger constitutes a Share Exchange Event, a Fundamental Change and a Make-Whole Fundamental Change (each as defined in the Indentures) under the Indentures. The effective date of the Share Exchange Event, Fundamental Change and Make-Whole Fundamental Change in respect of the Notes is the Closing Date.

The foregoing descriptions of the Indentures and the transactions contemplated thereby do not purport to be complete and are subject to and qualified in their entirety by reference to the full text of the Indentures. A copy of each of the Original 2060 Indenture and Original 2030 Indenture was filed as Exhibit 4.3 and 4.5, respectively, to the Current Report on Form 10-Q filed by the Company with the SEC on May 13, 2021 and November 5, 2025, respectively. A copy of the 2026 Supplemental Indenture is filed as Exhibit 4.1 hereto and a copy of the 2030 Supplemental Indenture is filed as Exhibit 4.2 hereto. The Indentures and the Supplemental Indentures are incorporated by reference into this Item 1.01. This Current Report on Form 8-K does not constitute an offer to tender for, or purchase, or a solicitation of an offer to tender for, or purchase, any of the Notes or any other security.

---

| | |
|:---|:---|
| **Item 1.02** | **Termination of a Material Definitive Agreement.**  |

---

The information contained in the Introductory Note of this Current Report on Form 8-K is incorporated by reference into this Item 1.02.

In connection with the consummation of the Merger on the Closing Date (the "**Effective Time**"), the Company terminated the Company's 2011 Equity Incentive Plan, the Company's 2018 Equity Incentive Plan, the Company's 2017 Inducement Award Plan, the Company's 2021 Inducement Award Plan and the Company's Amended and Restated 2014 Employee Stock Purchase Plan.

---

| | |
|:---|:---|
| **Item 2.01** | **Completion of Acquisition or Disposition of Assets.**  |

---

The information contained in the Introductory Note and Items 1.02, 5.01 and 5.03 of this Current Report on Form 8-K is incorporated by reference into this Item 2.01.

The Offer and withdrawal rights expired as scheduled at one minute following 11:59 P.M., Eastern Time, on February 9, 2026 (such date and time, the "**Expiration Time**") and the Offer was not extended. According to Continental Stock Transfer & Trust Company, the depositary and paying agent for the Offer (the "**Depositary**"), a total of 84,680,752 Shares were validly tendered and not validly withdrawn, which Shares represented approximately 73.92% of the aggregate number of Shares outstanding at the Expiration Time. As a result, as of the Expiration Time, a sufficient number of Shares were validly tendered and not validly withdrawn such that the minimum tender condition to the Offer was satisfied, and following the satisfaction of each other condition to the Offer, Parent and Purchaser irrevocably accepted for payment, on February 10, 2026, all Shares that were validly tendered and not validly withdrawn pursuant to the Offer.

Also on February 10, 2026, following consummation of the Offer, Purchaser merged with and into the Company, with the Company being the surviving corporation (the "**Merger**"). The Merger was governed by Section 251(h) of the General Corporation Law of the State of Delaware (the "**DGCL**"), with no vote of the stockholders of the Company required to consummate the Merger. Upon completion of the Merger, the Company became an indirect wholly owned subsidiary of Parent.

At the Effective Time and pursuant to the terms and conditions of the Merger Agreement, each Share then outstanding (other than Shares (a) held by the Company or held in the Company's treasury (other than, in each case, Shares that are held in a fiduciary or agency capacity and are beneficially owned by third parties), Parent, Purchaser, any other direct or indirect wholly owned subsidiary of Parent, or by stockholders of the Company who have properly exercised and perfected their statutory rights of appraisal under the DGCL, or (b) irrevocably accepted for purchase in the Offer) was automatically canceled and converted into the right to receive the Offer Price (the "**Merger Consideration**"), without interest and subject to any withholding of taxes.

------

As of immediately prior to and contingent upon the occurrence of the Effective Time, pursuant to the Merger Agreement, except as described below, each outstanding option to purchase Shares (each, an "**Option**") became fully vested (in the case of performance-based Options, assuming the applicable level of attainment provided for in the Merger Agreement) and exercisable, and to the extent unexercised as of immediately before the Effective Time, was cancelled at the Effective Time and converted into the right to receive a cash payment, without interest, subject to any applicable withholding of taxes, in an amount equal to the product of (i) the total number of Shares subject to the fully vested Option immediately prior to the Effective Time, multiplied by (ii) the excess, if any, of (x) the Merger Consideration over (y) the exercise price payable per Share under such Option.

As of immediately prior to and contingent upon the occurrence of the Effective Time, pursuant to the Merger Agreement, except as described below, each outstanding restricted stock unit granted pursuant to any Company equity plan, whether vested or unvested (each, an "**RSU**"), was, by virtue of the Merger, cancelled and converted into the right to receive a cash payment, without interest, subject to any applicable withholding of taxes, in an amount equal to (i) the total number of Shares issuable in settlement of such RSU immediately prior to the Effective Time multiplied by (ii) the Merger Consideration.

As of immediately prior to and contingent upon the occurrence of the Effective Time, pursuant to the Merger Agreement, except as described below, each outstanding performance-based restricted stock unit granted pursuant to any Company equity plan, whether vested or unvested (each, a "**PSU**"), was, by virtue of the Merger, cancelled and converted into the right to receive a cash payment, without interest, subject to any applicable withholding of taxes, in an amount equal to (i) the total number of Shares issuable in settlement of such PSU immediately prior to the Effective Time (assuming the applicable level of attainment provided for in the Merger Agreement) multiplied by (ii) the Merger Consideration.

The foregoing treatment of the Company's outstanding equity incentive awards did not apply to 50% of the unvested Options, RSUs and PSUs that were granted to employees in calendar year 2025 or 2026, in each case, that were outstanding immediately prior to the Effective Time. Instead, such equity incentive awards were cancelled and converted into cash-based awards (based on the Merger Consideration less, in the case of Options, the applicable exercise price per Share underlying such Option). Each such converted cash-based award (and the right to payments in respect thereof) is subject to the terms and conditions (including vesting, forfeiture and acceleration provisions) applicable to the corresponding equity incentive award immediately prior to the Effective Time, subject to vesting and payment on the date that is six months following the closing date of the Merger. Vesting of each such converted cash-based award will be generally accelerated upon the holder's involuntary termination prior to the applicable vesting date.

The foregoing summary of the Offer, the Merger, the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is qualified in its entirety by reference to the Merger Agreement, which is filed hereto as Exhibit 2.1 and which is incorporated herein by reference.

---

| | |
|:---|:---|
| **Item 3.01** | **Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.**  |

---

The information contained in the Introductory Note and Item 2.01 of this Current Report on Form 8-K is incorporated by reference into this Item 3.01.

In connection with the closing of the Merger, the Company (i) notified Nasdaq Global Select Market ("**Nasdaq**") that the Merger was consummated and (ii) requested that Nasdaq (A) halt trading of and delist the Shares effective before the opening of trading on February 10, 2026, and (B) file with the SEC a Form 25 Notification of Removal from Listing and/or Registration to delist and deregister the Shares under Section 12(b) of the Securities Exchange Act of 1934, as amended (the "**Exchange Act**"). The Company also intends to file with the SEC a Certification and Notice of Termination of Registration on Form 15 under the Exchange Act, requesting the termination of registration of the Shares under Section 12(g) of the Exchange Act and the suspension of the Company's reporting obligations under Sections 13 and 15(d) of the Exchange Act as promptly as practicable.

------

---

| | |
|:---|:---|
| **Item 3.03.** | **Material Modification to Rights of Security Holders.**  |

---

The information contained in the Introductory Note and Items 2.01, 3.01, 5.01 and 5.03 of this Current Report on Form 8-K is incorporated by reference into this Item 3.03.

---

| | |
|:---|:---|
| **Item 5.01** | **Changes in Control of Registrant.**  |

---

The information contained in the Introductory Note and Items 2.01, 5.02 and 5.03 of this Current Report on Form 8-K is incorporated by reference into this Item 5.01.

As a result of Purchaser's acceptance for payment of all Shares that were validly tendered and not properly withdrawn in accordance with the terms of the Offer, on February 10, 2026, a change of control of the Company occurred. As a result of the consummation of the Merger pursuant to Section 251(h) of the DGCL at the Effective Time, the Company became an indirect wholly owned subsidiary of Parent. Parent and its controlled affiliates have provided Purchaser with the necessary funds to consummate the Offer and Merger and to pay related fees and expenses from its and its affiliates' general corporate funds, as previously disclosed in "The Offer-Section 9-Source and Amount of Funds" of the Offer to Purchase, which section is incorporated herein by reference.

---

| | |
|:---|:---|
| **Item 5.02** | **Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.**  |

---

The information contained in the Introductory Note and Item 2.01 of this Current Report on Form 8-K is incorporated by reference into this Item 5.02.

*Directors* 

Effective as of the Effective Time, each of the directors of the Company (Scott Myers, Ryan Spencer, Daniel L. Kisner, M.D., Lauren Silvernail, Brent MacGregor, Elaine Sun, Francis R. Cano, Ph.D., Peter R. Paradiso, Ph.D. and Emilio Emini, Ph.D.) resigned from his or her respective position as a member of the Company's board of directors, and any committee thereof. As of the Effective Time, in accordance with the Merger Agreement, the sole director of Purchaser as of immediately prior to the Effective Time, François-Xavier Dazogbo, became the sole director of the Company. After the Effective Time, Genzyme Corporation, as sole stockholder of the Company, passed resolutions appointing Thomas Grenier and Colleen Proctor as the sole directors of the Company.

*Officers* 

Effective as of the Effective Time the sole officer of Purchaser as of immediately prior to the Effective Time, François-Xavier Dazogbo, became the sole officer of the Company. After the Effective Time, François-Xavier Dazogbo, as sole director of the Company, passed resolutions appointing (or confirming the appointment of) the following individuals as officers of the Company: (i) Ryan Spencer, Chief Executive Officer, (ii) David F. Novack, President and Chief Operating Officer, (iii) Kelly MacDonald, Senior Vice President and Chief Financial Officer, (iv) John L. Slebir, Senior Vice President, General Counsel and Secretary, (v) Jamie Haney, Secretary, (vi) François-Xavier Dazogbo, Treasurer, (vii) Stephen Kalinchak, Assistant Secretary, (viii) Colleen Proctor, Vice President and (ix) Thomas Grenier, Vice President.

In connection with the Merger, the Company entered into letter agreements with Ryan Spencer (the Company's Chief Executive Officer), Kelly MacDonald (the Company's Senior Vice President, Chief Financial Officer), and John Slebir (the Company's Senior Vice President, General Counsel and Secretary) (the "**Letter Agreements**") to provide such executive officers with reimbursement, if required, for excise taxes that may be incurred by such executive officers under Section 4999 of the Internal Revenue Code of 1986, as amended, on certain payments received in connection with the Merger, so that on a net after-tax basis each such executive officer would be in the same position as if no such excise tax had applied to such executive officer. The payments under each Letter Agreement generally are limited to a maximum amount of (a) $5,924,065 for Mr. Spencer, (b) $2,080,607 for Mr. Slebir, and (c) $1,995,328 for Ms. MacDonald. For additional information, see Item 3 of the Company's Solicitation/Recommendation Statement on Schedule 14D-9 filed with the SEC on January 12, 2026 (the "**Schedule 14D-9**") under the heading "Past Contacts, Transactions, Negotiations and Agreements - Arrangements with Executive Officers, Directors and Affiliates of the Company – Make-Whole Payments," which

------

information is incorporated herein by reference. The foregoing summary of the Letter Agreements does not purport to be complete and is qualified in its entirety by the full text of the form of Letter Agreement, a copy of which is filed as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference.

---

| | |
|:---|:---|
| **Item 5.03** | **Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.**  |

---

Pursuant to the terms of the Merger Agreement, at the Effective Time, the Company's amended and restated certificate of incorporation, as amended, and amended and restated bylaws were amended and restated in their entirety in the forms filed as Exhibits 3.1 and 3.2, respectively, to this Current Report on Form 8-K, and are incorporated herein by reference.

------

---

| | |
|:---|:---|
| **Item 9.01** | **Financial Statements and Exhibits.**  |

---

(d) Exhibits.

---

| | |
|:---|:---|
| **Exhibit**<br> **No.** | **Description** |
| 2.1\* | [Agreement and Plan of Merger, dated as of December 23, 2025, by and among Dynavax Technologies Corporation, Sanofi and Samba Merger Sub, Inc. (incorporated by reference to Exhibit 2.1 of the Current Report on Form 8-K filed by the Company on December 23, 2025 (File No. 001-34207)).](http://www.sec.gov/Archives/edgar/data/1029142/000119312525332264/d82616dex21.htm) |
| 3.1\*\* | [Eighth Restated Certificate of Incorporation of Dynavax Technologies Corporation.](d945003dex31.htm) |
| 3.2\*\* | [Second Amended and Restated Bylaws of the Surviving Corporation.](d945003dex32.htm) |
| 4.1\*\* | [First Supplemental Indenture, dated as of February 10, 2026, by and between Dynavax Technologies Corporation and U.S. Bank Trust Company, National Association (as successor in interest to U.S. Bank National Association), as Trustee.](d945003dex41.htm) |
| 4.2\*\* | [First Supplemental Indenture, dated as of February 10, 2026, by and between Dynavax Technologies Corporation and U.S. Bank Trust Company, National Association, as Trustee.](d945003dex42.htm) |
| 10.1\*\* | [Form of Letter Agreement regarding Make-Whole Awards.](d945003dex101.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

---

\* Schedules omitted pursuant to Item 601 of Regulation S-K. The Company agrees to furnish supplementally a copy of any omitted schedule to the SEC upon request.

\*\* Filed herewith.

------

#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | | |
|:---|:---|:---|
|  | **Dynavax Technologies Corporation** | **Dynavax Technologies Corporation** |
| Date: February 10, 2026 | By: | /s/ Thomas Grenier |
|  |  | Thomas Grenier |
|  |  | Vice President |

---

## Exhibit 3.1

**Exhibit 3.1** 

**EIGHTH AMENDED AND** 

**RESTATED** 

**CERTIFICATE OF INCORPORATION** 

**OF** 

**DYNAVAX TECHNOLOGIES CORPORATION** 

FIRST: The name of the corporation (the "<u>Corporation</u>") is: Dynavax Technologies Corporation.

SECOND: The address of the registered office of the Corporation in the State of Delaware is: Corporation Service Company, 251 Little Falls Drive, Wilmington, DE 19808, County of New Castle. The name of its registered agent for service of process in the State of Delaware at such address is Corporation Service Company.

THIRD: The purpose of the Corporation is to engage in any and all lawful acts or activities for which corporations may be organized under the General Corporation Law of the State of Delaware (the "<u>DGCL</u>"), as from time to time amended.

FOURTH: The total number of shares of capital stock which the Corporation shall have authority to issue is one hundred (100), all of which shares shall be common stock each having a par value of $0.0001 per share.

FIFTH: In addition to the powers and authority herein before or by statute expressly conferred upon them, the board of directors of the Corporation (the "<u>Board</u><u> </u><u>of</u><u> </u><u>Directors</u>") is hereby empowered to exercise all such powers and do all such acts and things as may be exercised or done by the Corporation, subject to the provisions of the DGCL, this Certificate of Incorporation and the bylaws of the Corporation.

SIXTH: In furtherance and not in limitation of the powers conferred by law, subject to any limitations contained in this Certificate of Incorporation, bylaws of the Corporation may be adopted, amended or repealed by a majority of the Board of Directors, but any bylaws adopted by the Board of Directors may be amended or repealed by the stockholders entitled to vote thereon. Election of directors need not be by written ballot unless the bylaws of the Corporation so provide.

SEVENTH: Except to the extent that the DGCL prohibits the elimination or limitation of liability of directors for breaches of fiduciary duty, no director of the Corporation shall be personally liable to the Corporation or its stockholders for monetary damages for any breach of fiduciary duty as a director, notwithstanding any provision of law imposing such liability. No amendment to or repeal of this provision shall apply to or have any effect on the liability or alleged liability of any director of the Corporation for or with respect to any acts or omissions of such director occurring prior to such amendment.

------

EIGHTH: The Corporation shall, to the fullest extent permitted by the provisions of Section 145 of the General Corporation Law of the State of Delaware, as the same may be amended and supplemented, indemnify any and all persons whom it shall have power to indemnify under said section from and against any and all of the expenses, liabilities, or other matters referred to in or covered by said section, and the indemnification provided for herein shall not be deemed exclusive of any other rights to which those indemnified may be entitled under any Bylaw, agreement, vote of stockholders or disinterested directors or otherwise, both as to action in his official capacity and as to action in another capacity while holding such office, and shall continue as to a person who has ceased to be a director, officer, employee, or agent and shall inure to the benefit of the heirs, executors, and administrators of such person.

NINTH: Meetings of stockholders may be held within or without the State of Delaware, as the bylaws may provide. The books of the Corporation may be kept (subject to any provision contained in the DGCL) outside the State of Delaware at such place or places as may be designated from time to time by the Board of Directors or in the bylaws of the Corporation.

TENTH: The Board of Directors reserves the right to amend, alter, change or repeal any provision contained in this Certificate of Incorporation, in the manner now or hereafter prescribed by statute, and all rights conferred upon stockholders herein are granted subject to this reservation.

## Exhibit 3.2

**Exhibit 3.2** 

**AMENDED AND RESTATED** 

**BYLAWS** 

**OF** 

**DYNAVAX TECHNOLOGIES CORPORATION** 

(a Delaware corporation)

ARTICLE I

<u>Stockholders</u> 

SECTION 1. <u>Annual Meetings</u>. The annual meeting of the stockholders of Dynavax Technologies Corporation (the "<u>Corporation</u>") for the election of directors and for the transaction of such other business as may properly come before the meeting shall be held each year at such date and time, within or without the State of Delaware, as the board of directors of the Corporation (the "<u>Board of Directors</u>") shall determine.

SECTION 2. <u>Special Meetings</u>. Special meetings of stockholders for the transaction of such business as may properly come before the meeting or for any other purpose or purposes may be called by order of the Board of Directors or by stockholders holding together at least a majority of all the shares of the Corporation entitled to vote at the meeting, and shall be held at such date and time, within or without the State of Delaware, as may be specified by such order. Whenever the directors shall fail to fix such place, the meeting shall be held at the principal executive office of the Corporation.

SECTION 3. <u>Notice of Meetings</u>. Written notice of all meetings of the stockholders, stating the place (if any), date and hour of the meeting, the means of remote communications, if any, by which stockholders and proxy holders may be deemed to be present in person and vote at such meeting, and the place within the city or other municipality or community at which the list of stockholders may be examined, shall be mailed or delivered (physically or electronically) to each stockholder entitled to notice of or to vote at such meeting not less than 10 nor more than 60 days prior to the meeting. Notice of any special meeting shall state in general terms the purpose or purposes for which the meeting is to be held, and at such special meeting, only such business shall be conducted as shall be specified in the notice of meeting. Stockholders may participate in any such meeting by means of a conference telephone or similar communications equipment by means of which all persons participating in the meeting can hear each other, and such participation in meeting shall constitute presence at such meeting. Without limiting the manner by which notice otherwise may be given effectively to stockholders, notice of meetings may be given to stockholders by means of electronic transmission in accordance with applicable law. Notice of any meeting need not be given to any stockholder who shall, either before or after the meeting, submit a waiver of notice or who shall attend such meeting, except when the stockholder attends for the express purpose of objecting, at the beginning of the meeting, to the transaction of any business because the meeting is not lawfully called or convened. Any stockholder so waiving notice of the meeting shall be bound by the proceedings of the meeting in all respects as if due notice thereof had been given.

------

SECTION 4. <u>Stockholder Lists</u>. The officer who has charge of the stock ledger of the Corporation shall prepare and make, at least 10 days before every meeting of stockholders, a complete list of the stockholders entitled to vote at the meeting, arranged in alphabetical order, and showing the address of each stockholder and the number and class of shares registered in the name of each stockholder. Such list shall be open to the examination of any stockholder, for any purpose germane to the meeting, either at a place within the city where the meeting is to be held, which place shall be specified in the notice of the meeting, or, if not so specified, at the place where the meeting is to be held. The list shall also be produced and kept at the time and place of the meeting during the whole time thereof, and may be inspected by any stockholder who is present.

The stock ledger shall be the only evidence as to who are the stockholders entitled to examine the stock ledger, the list required by this section or the books of the Corporation, or to vote in person or by proxy at any meeting of stockholders.

SECTION 5. <u>Quorum</u>. Except as otherwise provided by law or the Corporation's Certificate of Incorporation, a quorum for the transaction of business at any meeting of stockholders shall consist of the holders of record of a majority of the issued and outstanding shares of the capital stock of the Corporation entitled to vote at the meeting, present in person or by proxy. At all meetings of the stockholders at which a quorum is present, all matters, except as otherwise provided by law or the Certificate of Incorporation, shall be decided by the vote of the holders of a majority of the shares entitled to vote thereat present in person or by proxy. If there be no such quorum, the holders of a majority of such shares so present or represented may adjourn the meeting from time to time, without further notice, until a quorum shall have been obtained. When a quorum is once present it is not broken by the subsequent withdrawal of any stockholder.

SECTION 6. <u>Organization</u>. Meetings of stockholders shall be presided over by the Chairman, if any, or if none or in the Chairman's absence the Vice-Chairman, if any, or if none or in the Vice-Chairman's absence, the President, if any, or if none or in the President's absence a Vice-President, or, if none of the foregoing is present, by a chairman to be chosen by the stockholders entitled to vote who are present in person or by proxy at the meeting. The Secretary of the Corporation, or in the Secretary's absence, the presiding officer of the meeting shall appoint any person present to act as secretary of the meeting.

SECTION 7. <u>Voting; Proxies; Required Vote</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) At each meeting of stockholders, every stockholder entitled to vote at such meeting shall be entitled to vote in person or by proxy appointed by instrument in writing, subscribed by such stockholder or by such stockholder's duly authorized attorney-in-fact (but no such proxy shall be voted or acted upon after three years from its date, unless the proxy provides for a longer period), and, unless the Certificate of Incorporation provides otherwise, shall have one vote for each share of stock entitled to vote registered in the name of such stockholder on the books of the Corporation on the applicable record date fixed pursuant to these Bylaws. At all elections of directors the voting may but need not be by ballot and a plurality of the votes cast there shall elect such directors. Except as otherwise required by law or the Certificate of Incorporation, any other action shall be authorized by the vote of the majority of the shares present in person or by proxy at the meeting and entitled to vote on the subject matter.

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Any action required or permitted to be taken at any meeting of stockholders may, except as otherwise required by law or the Certificate of Incorporation, be taken without a meeting, without prior notice and without a vote, if a consent in writing, setting forth the action so taken, shall be signed by the holders of record of the issued and outstanding capital stock of the Corporation having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares entitled to vote thereon were present and voted, and the writing or writings are filed with the permanent records of the Corporation. Prompt notice of the taking of corporate action without a meeting by less than unanimous written consent shall be given to those stockholders who have not consented in writing.

SECTION 8. <u>Inspectors</u>. The Board of Directors, in advance of any meeting, may, but need not, appoint one or more inspectors of election to act at the meeting or any adjournment thereof. If an inspector or inspectors are not so appointed, the person presiding at the meeting may, but need not, appoint one or more inspectors. In case any person who may be appointed as an inspector fails to appear or act, the vacancy may be filled by an appointment made by the directors in advance of the meeting or at the meeting by the person presiding thereat. Each inspector, if any, before entering upon the discharge of his or her duties, shall take and sign an oath faithfully to execute the duties of inspector at such meeting with strict impartiality and according to the best of his or her ability. The inspectors, if any, shall determine the number of shares of stock outstanding and the voting power of each, the shares of stock represented at the meeting, the existence of a quorum, and the validity and effect of proxies, and shall receive votes, ballots or consents, hear and determine all challenges and questions arising in connection with the right to vote, count and tabulate all votes, ballots or consents, determine the result, and do such acts as are proper to conduct the election or vote with fairness to all stockholders. On request of the person presiding at the meeting, the inspector or inspectors, if any, shall make a report in writing of any challenge, question or matter determined by such inspector or inspectors and execute a certificate of any fact found by such inspector or inspectors.

SECTION 9. <u>Written Consent of Stockholders Without a Meeting</u>. Any action to be taken at any annual or special meeting of stockholders may be taken without a meeting, without prior notice and without a vote, if a consent or consents in writing, setting forth the action to be so taken, shall be signed by the holders of outstanding stock having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares entitled to vote thereon were present and voted and shall be delivered (physically or electronically) to the Corporation by delivery to its registered office in the State of Delaware, its principal place of business, or an officer or agent of the Corporation having custody of the book in which proceedings of meetings of stockholders are recorded. Prompt notice of the taking of the corporate action without a meeting by less than unanimous written consent shall, to the extent required by applicable law, be given to those stockholders who have not consented in writing, and who, if the action had been taken at a meeting, would have been entitled to notice of the meeting if the record date for notice of such meeting had been the date that written consents signed by a sufficient number of holders to take the action were delivered to the Corporation.

SECTION 10. <u>Remote Communication</u>. Stockholders and proxy holders not physically present at a meeting of stockholders may, by means of remote communication: (i) participate in a meeting of stockholders; and (ii) be deemed present in person and vote at a meeting of stockholders, whether such meeting is to be held at a designated place or solely by means of remote communication, provided that (A) the Corporation shall implement reasonable measures to verify that each person deemed present and permitted to vote at the meeting by means of remote

------

communication is a stockholder or proxyholder, (B) the Corporation shall implement reasonable measures to provide such stockholders and proxy holders a reasonable opportunity to participate in the meeting and to vote on matters submitted to the stockholders, including an opportunity to read or hear the proceedings of the meeting substantially concurrently with such proceedings, and (C) if any stockholder or proxy holder votes or takes other action at the meeting by means of remote communication, a record of such votes or other action shall be maintained by the Corporation.

ARTICLE II

<u>Board of Directors</u> 

SECTION 1. <u>General Powers</u>. The business, property and affairs of the Corporation shall be managed by, or under the direction of, the Board of Directors.

SECTION 2. <u>Qualification; Number; Term; Compensation</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) Each director shall be at least 18 years of age. A director need not be a stockholder, a citizen of the United States or a resident of the State of Delaware. The number of directors constituting the entire Board of Directors shall be fixed initially by the incorporator and thereafter by the Board of Directors and shall be at least one, or such larger number as may be fixed initially by the incorporator and thereafter from time to time by the Board of Directors, one of whom may be selected by the Board of Directors to be its Chairman. The use of the phrase "entire Board of Directors" herein refers to the total number of directors which the Corporation would have if there were no vacancies.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) Directors who are elected at an annual meeting of stockholders, and directors who are elected in the interim to fill vacancies and newly created directorships, shall hold office until the next annual meeting of stockholders and until their successors are elected and qualified or until their earlier resignation or removal.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) Unless otherwise restricted by the Certificate of Incorporation or these Bylaws, the Board of Directors shall have the authority to fix the compensation of directors. The directors may be paid their expenses, if any, of attendance at each meeting of the Board of Directors and may be paid a fixed sum for attendance at each meeting of the Board of Directors or a stated salary as director. No such payment shall preclude any director from serving the Corporation in any other capacity and receiving compensation therefor. Members of special or standing committees may be allowed like compensation for attending committee meetings.

SECTION 3. <u>Quorum and Manner of Voting</u>. Except as otherwise provided by law, a majority of the entire Board of Directors shall constitute a quorum. A majority of the directors present, whether or not a quorum is present, may adjourn a meeting from time to time to another time and place without notice. The vote of the majority of the directors present at a meeting at which a quorum is present shall be the act of the Board of Directors. Each director shall be entitled to one vote on exactly the matter presented to the Board of Directors for approval.

------

SECTION 4. <u>Places of Meetings</u>. Meetings of the Board of Directors may be held at any place within or without the State of Delaware, as may from time to time be fixed by resolution of the Board of Directors, or as may be specified in the notice of meeting, if any.

SECTION 5. <u>Annual Meeting</u>. Following the annual meeting of stockholders, the newly elected Board of Directors shall meet for the purpose of the election of officers and the transaction of such other business as may properly come before the meeting. Such meeting may be held without notice immediately after the annual meeting of stockholders at the same place at which such stockholders' meeting is held.

SECTION 6. <u>Regular Meetings</u>. Regular meetings of the Board of Directors shall be held at such times and places as the Board of Directors shall from time to time determine by resolution. Notice need not be given of regular meetings of the Board of Directors held at times and places fixed by resolution of the Board of Directors and promptly communicated to all directors then in office.

SECTION 7. <u>Special Meetings</u>. Special meetings of the Board of Directors shall be held whenever called by the Chairman, the President or by a majority of the directors then in office.

SECTION 8. <u>Notice of Meetings</u>. Whenever required, notice of the place, date and time and the purpose or purposes of each meeting of the Board of Directors shall be given to each director not less than two calendar days before the day of the meeting by mail, telephone, facsimile, e-mail, or by personal delivery.

SECTION 9. <u>Meetings by Means of Conference Telephone</u>. Unless otherwise provided by the Certificate of Incorporation or these Bylaws, members of the Board of Directors, or any committee designated by the Board of Directors, may participate in a meeting of the Board of Directors or such committee by means of a conference telephone or similar communication equipment by means of which all persons participating in the meeting can hear each other, and such participation in a meeting pursuant to this <u>Section</u> <u>8</u> shall constitute presence at such meeting.

SECTION 10. <u>Organization</u>. The Chairman, if there be one, or if none or in the Chairman's absence or inability to act the Vice Chairman, if any, or if none or in the Vice-Chairman's absence or inability to act the President, or in the President's absence or inability to act any Vice-President who is a member of the Board of Directors, or in such Vice-President's absence or inability to act, a chairman chosen by the directors, shall preside at all meetings of the Board of Directors and shall have such other powers and duties as may from time to time be assigned by the Board of Directors. The Secretary of the Corporation shall act as secretary at all meetings of the Board of Directors when present, and, in the Secretary's absence, the presiding officer may appoint any person to act as secretary.

SECTION 11. <u>Resignation; Removal</u>. Any director may resign at any time upon written notice to the Corporation and such resignation shall take effect upon receipt thereof by the President or Secretary, unless otherwise specified in the resignation. Any or all of the directors may be removed, with or without cause, by the holders of a majority of the shares of stock outstanding and entitled to vote for the election of directors.

------

SECTION 12. <u>Vacancies</u>. Unless otherwise provided in these Bylaws, vacancies on the Board of Directors, whether caused by resignation, death, disqualification, removal, an increase in the authorized number of directors or otherwise, may be filled by the affirmative vote of a majority of the remaining directors, although less than a quorum, or by a sole remaining director, or at a special meeting of the stockholders, by the holders of shares entitled to vote for the election of directors.

SECTION 13. <u>Action by Written Consent</u>. Any action required or permitted to be taken at any meeting of the Board of Directors may be taken without a meeting if all the directors consent thereto in writing, and the writing or writings are filed with the minutes of proceedings of the Board of Directors.

ARTICLE III

<u>Committees</u> 

SECTION 1. <u>Appointment</u>. From time to time the Board of Directors by a resolution adopted by a majority of the entire Board of Directors may appoint any committee or committees for any purpose or purposes, to the extent lawful, which shall have powers as shall be determined and specified by the Board of Directors in the resolution of appointment.

SECTION 2. <u>Procedures, Quorum and Manner of Acting</u>. Each committee shall fix its own rules of procedure, and shall meet where and as provided by such rules or by resolution of the Board of Directors. Except as otherwise provided by law, the presence of a majority of the then appointed members of a committee shall constitute a quorum for the transaction of business by that committee, and in every case where a quorum is present the affirmative vote of a majority of the members of the committee present shall be the act of the committee. Each committee shall keep minutes of its proceedings, and actions taken by a committee shall be reported to the Board of Directors.

SECTION 3. <u>Action by Written Consent</u>. Any action required or permitted to be taken at any meeting of any committee of the Board of Directors may be taken without a meeting if all the members of the committee consent thereto in writing, and the writing or writings are filed with the minutes of proceedings of the committee.

SECTION 4. <u>Term; Termination</u>. In the event any person shall cease to be a director of the Corporation, such person shall simultaneously therewith cease to be a member of any committee appointed by the Board of Directors.

ARTICLE IV

<u>Officers</u> 

SECTION 1. <u>Election and Qualifications</u>. The Board of Directors shall elect the officers of the Corporation, which shall include a President and a Secretary, and may include, by election or appointment, one or more Vice-Presidents (any one or more of whom may be given an additional designation of rank or function), a Treasurer and such Assistant Secretaries, such Assistant Treasurers and such other officers as the Board of Directors may from time to time deem proper. Each officer shall have such powers and duties as may be prescribed by these Bylaws and as may be assigned by the Board of Directors or the President. Any two or more offices may be held by the same person. The Chairman of the Board of Directors, if one is appointed, shall, if present, preside at all meetings of the stockholders.

------

SECTION 2. <u>Term of Office and Remuneration</u>. All officers shall hold office until their successors are elected and qualified. Any vacancy in any office arising from any cause may be filled for the unexpired portion of the term by the Board of Directors. The remuneration of all officers of the Corporation may be fixed by the Board of Directors or in such manner as the Board of Directors shall provide.

SECTION 3. <u>Resignation; Removal</u>. Any officer may resign at any time upon written notice to the Corporation and such resignation shall take effect upon receipt thereof by the President or Secretary, unless otherwise specified in the resignation. Any officer shall be subject to removal, with or without cause, at any time by vote of a majority of the entire Board of Directors.

SECTION 4. <u>President</u>. The President shall, subject to control of the Board of Directors, have direction and control of the business and officers of the Corporation, shall have the general powers and duties of management usually vested in the president of a corporation, and shall have such other powers and duties as may from time to time be assigned by the Board of Directors. The President may appoint and remove assistant officers and other agents and employees; and may execute and deliver in the name of the Corporation powers of attorney, contracts, bonds and other obligations and instruments.

SECTION 5. <u>Vice-President</u>. A Vice-President may execute and deliver in the name of the Corporation contracts and other obligations and instruments pertaining to the regular course of the duties of said office, and shall have such other authority as from time to time may be assigned by the Board of Directors.

SECTION 6. <u>Treasurer</u>. The Treasurer (if any) shall in general have all duties incident to the position of Treasurer and such other duties as may be assigned by the Board of Directors.

SECTION 7. <u>Secretary</u>. The Secretary shall in general have all the duties incident to the office of Secretary and such other duties as may be assigned by the Board of Directors.

SECTION 8. <u>Other Officers</u>. Such other officers as the Board of Directors may choose shall perform such duties and have such powers as from time to time may be assigned to them by the Board of Directors. The Board of Directors may delegate to any other officer of the Corporation the power to choose such other officers and to prescribe their respective duties and powers.

ARTICLE V

<u>Books and Records</u> 

SECTION 1. <u>Location</u>. The books and records of the Corporation may be kept at such place or places within or outside the State of Delaware as the Board of Directors or the respective officers in charge thereof may from time to time determine. The record books containing the names and addresses of all stockholders, the number and class of shares of stock held by each and the dates when they respectively became the owners of record thereof shall be kept by the Secretary as prescribed in these Bylaws and by such officer or agent as shall be designated by the Board of Directors.

------

SECTION 2. <u>Addresses of Stockholders</u>. Notices of meetings and all other corporate notices may be delivered personally, electronically or mailed to each stockholder at the stockholder's address as it appears on the records of the Corporation.

SECTION 3. <u>Fixing Date for Determination of Stockholders of Record</u>.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) In order that the Corporation may determine the stockholders entitled to notice of or to vote at any meeting of stockholders or any adjournment thereof, the Board of Directors may fix a record date, which record date shall not precede the date upon which the resolution fixing the record date is adopted by the Board of Directors and which record date shall not be more than 60 nor less than 10 days before the date of such meeting. If no record date is fixed by the Board of Directors, the record date for determining stockholders entitled to notice of or to vote at a meeting of stockholders shall be at the close of business on the day next preceding the day on which notice is given, or, if notice is waived, at the close of business on the day next preceding the day on which the meeting is held. A determination of stockholders of record entitled to notice of or to vote at a meeting of stockholders shall apply to any adjournment of the meeting; provided, however, that the Board of Directors may fix a new record date for the adjourned meeting.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) In order that the Corporation may determine the stockholders entitled to consent to corporate action in writing without a meeting, the Board of Directors may fix a record date, which record date shall not precede the date upon which the resolution fixing the record date is adopted by the Board of Directors and if no record date has been fixed by the Board of Directors, the record date for determining stockholders entitled to consent to corporate action in writing without a meeting, when no prior action by the Board of Directors is required, shall be the first date on which a signed written consent setting forth the action taken or proposed to be taken is delivered to the Corporation by delivery to its registered office in this State, its principal place of business, or an officer or agent of the Corporation having custody of the book in which proceedings of meetings of stockholders are recorded. Delivery made to the Corporation's registered office shall be by hand or by certified or registered mail, return receipt requested. If no record date has been fixed by the Board of Directors and prior action by the Board of Directors is required by this article, the record date for determining stockholders entitled to consent to corporate action in writing without a meeting shall be at the close of business on the day on which the Board of Directors adopts the resolution taking such prior action.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) In order that the Corporation may determine the stockholders entitled to receive payment of any dividend or other distribution or allotment of any rights or the stockholders entitled to exercise any rights in respect of any change, conversion or exchange of stock, or for the purpose of any other lawful action, the Board of Directors may fix a record date, which record date shall not precede the date upon which the resolution fixing the record date is adopted and if no record date is fixed, the record date for determining stockholders for any such purpose shall be at the close of business on the day on which the Board of Directors adopts the resolution relating thereto.

------

ARTICLE VI

<u>Certificates Representing Stock</u> 

SECTION 1. <u>Certificates; Signatures</u>. The shares of the Corporation's stock may be certificated or uncertificated, as provided under the Delaware General Corporation Law, as it may be amended and supplemented from time to time (the "<u>DGCL</u>"), and shall be entered in the books of the Corporation and registered as they are issued. Any certificates representing shares of stock shall be in such form as shall be approved by the Board of Directors. Every holder of stock represented by certificates and upon request every holder of uncertificated shares shall be entitled to have a certificate, signed by or in the name of the Corporation by the Chairman or Vice-Chairman of the Board of Directors, or the President or Vice-President, and by the Treasurer or an Assistant Treasurer, or the Secretary or an Assistant Secretary of the Corporation, representing the number of shares registered in certificate form. Any and all signatures on any such certificate may be facsimiles. In case any officer, transfer agent or registrar who has signed or whose facsimile signature has been placed upon a certificate shall have ceased to be such officer, transfer agent or registrar before such certificate is issued, it may be issued by the Corporation with the same effect as if he were such officer, transfer agent or registrar at the date of issue. The name of the holder of record of the shares represented thereby, with the number of such shares and the date of issue, shall be entered on the books of the Corporation.

SECTION 2. <u>Transfers of Stock</u>. Upon compliance with provisions restricting the transfer or registration of transfer of shares of stock, if any, shares of capital stock shall be transferable on the books of the Corporation only by the holder of record thereof in person, or by a duly authorized attorney, upon surrender and cancellation of certificates for a like number of shares, properly endorsed, and the payment of all taxes due thereon.

SECTION 3. <u>Fractional Shares</u>. The Corporation may, but shall not be required to, issue certificates for fractions of a share where necessary to effect authorized transactions, or the Corporation may pay in cash the fair value of fractions of a share as of the time when those entitled to receive such fractions are determined, or it may issue scrip in registered or bearer form over the manual or facsimile signature of an officer of the Corporation or of its agent, exchangeable as therein provided for full shares, but such scrip shall not entitle the holder to any rights of a stockholder except as therein provided.

SECTION 4. <u>Rules and Regulations</u>. The Board of Directors shall have power and authority to make all such rules and regulations as it may deem expedient concerning the issue, transfer and registration of certificates representing shares of the Corporation.

SECTION 5. <u>Lost, Stolen or Destroyed Certificates</u>. The Corporation may issue a new certificate of stock in place of any certificate, theretofore issued by it, alleged to have been lost, stolen or destroyed, and the Board of Directors may require the owner of any lost, stolen or destroyed certificate, or his legal representative, to give the Corporation a bond sufficient to indemnify the Corporation against any claim that may be made against it on account of the alleged loss, theft or destruction of any such certificate or the issuance of any such new certificate.

------

ARTICLE VII

<u>Dividends</u> 

Subject always to applicable law and the Certificate of Incorporation, the Board of Directors shall have full power to determine whether any, and, if any, what part of any, funds legally available for the payment of dividends shall be declared as dividends and paid to stockholders; the division of the whole or any part of such funds of the Corporation shall rest wholly within the lawful discretion of the Board of Directors, and it shall not be required at any time, against such discretion, to divide or pay any part of such funds among or to the stockholders as dividends or otherwise; and before payment of any dividend, there may be set aside out of any funds of the Corporation available for dividends such sum or sums as the Board of Directors from time to time, in its absolute discretion, deems proper as a reserve or reserves to meet contingencies, or for equalizing dividends, or for repairing or maintaining any property of the Corporation, or for such other purpose as the Board of Directors shall think conducive to the interest of the Corporation, and the Board of Directors may modify or abolish any such reserve in the manner in which it was created. Subject to applicable law and the Certificate of Incorporation, dividends upon the shares of capital stock of the Corporation may be declared by the Board of Directors at any regular or special meeting of the Board of Directors. Dividends may be paid in cash, in property, or in shares of the Corporation's capital stock, unless otherwise provided by applicable law or the Certificate of Incorporation.

ARTICLE VIII

<u>Ratification</u> 

Any transaction, questioned in any lawsuit on the ground of lack of authority, defective or irregular execution, adverse interest of director, officer or stockholder, non-disclosure, miscomputation, or the application of improper principles or practices of accounting, may be ratified before or after judgment, by the Board of Directors or by the stockholders, and if so ratified shall have the same force and effect as if the questioned transaction had been originally duly authorized. Such ratification shall be binding upon the Corporation and its stockholders and shall constitute a bar to any claim or execution of any judgment in respect of such questioned transaction.

ARTICLE IX

<u>Corporate Seal</u> 

The Corporation may have a corporate seal. The corporate seal shall have inscribed thereon the name of the Corporation and the year of its incorporation, and shall be in such form and contain such other words and/or figures as the Board of Directors shall determine. The corporate seal may be used by printing, engraving, lithographing, stamping or otherwise making, placing or affixing, or causing to be printed, engraved, lithographed, stamped or otherwise made, placed or affixed, upon any paper or document, by any process whatsoever, an impression, facsimile or other reproduction of said corporate seal.

------

ARTICLE X

<u>Fiscal Year</u> 

The fiscal year of the Corporation shall be fixed, and shall be subject to change, by the Board of Directors. Unless otherwise fixed by the Board of Directors, the fiscal year of the Corporation shall be the calendar year.

ARTICLE XI

<u>Waiver of Notice</u> 

Whenever notice is required to be given by these Bylaws or by the Certificate of Incorporation or by law, a written waiver thereof, signed by the person or persons entitled to such notice, whether before or after the time stated therein, shall be deemed equivalent to notice.

ARTICLE XII

<u>Bank Accounts, Drafts, Contracts, Etc.</u> 

SECTION 1. <u>Bank Accounts and Drafts</u>. In addition to such bank accounts as may be authorized by the Board of Directors, the primary financial officer or any person designated by said primary financial officer or otherwise authorized by the Board of Directors, whether or not an employee of the Corporation, may authorize such bank accounts to be opened or maintained in the name and on behalf of the Corporation as he may deem necessary or appropriate, payments from such bank accounts to be made upon and according to the check of the Corporation in accordance with the written instructions of said primary financial officer, or other person so authorized.

SECTION 2. <u>Contracts</u>. The Board of Directors may authorize any person or persons, in the name and on behalf of the Corporation, to enter into or execute and deliver any and all deeds, bonds, mortgages, contracts and other obligations or instruments (including powers of attorney), and such authority may be general or confined to specific instances.

SECTION 3. <u>Proxies; Powers of Attorney; Other Instruments</u>. The Chairman, the President or any other person designated by either of them shall have the power and authority to execute and deliver proxies, powers of attorney and other instruments on behalf of the Corporation in connection with the rights and powers incident to the ownership of stock by the Corporation. The Chairman, the President or any other person authorized by proxy or power of attorney executed and delivered by either of them on behalf of the Corporation may attend and vote at any meeting of stockholders of any company in which the Corporation may hold stock, and may exercise on behalf of the Corporation any and all of the rights and powers incident to the ownership of such stock at any such meeting, or otherwise as specified in the proxy or power of attorney so authorizing any such person. The Board of Directors, from time to time, may confer like powers upon any other person.

------

SECTION 4. <u>Financial Reports</u>. The Board of Directors may appoint the primary financial officer or other fiscal officer or any other officer to cause to be prepared and furnished to stockholders entitled thereto any special financial notice and/or financial statement, as the case may be, which may be required by any provision of law.

ARTICLE XIII

<u>Amendments</u> 

The Board of Directors shall have the power to adopt, amend or repeal these Bylaws. Bylaws adopted by the Board of Directors may be repealed or changed, and new Bylaws made, by the stockholders, and the stockholders may prescribe that any Bylaw made by them shall not be altered, amended or repealed by the Board of Directors.

[*Remainder of the Page Intentionally Left Blank*]

## Exhibit 4.1

**Exhibit 4.1** 

FIRST SUPPLEMENTAL INDENTURE

FIRST SUPPLEMENTAL INDENTURE, dated as of February 10, 2026 (this "**Supplemental Indenture**"), by and between Dynavax Technologies Corporation, a Delaware corporation, as issuer (the "**Company**"), and U.S. Bank Trust Company, National Association (as successor in interest to U.S. Bank National Association), as trustee (the "**Trustee**"), supplements the Indenture dated May 13, 2021 (as supplemented or otherwise modified prior to the date hereof, the "**Indenture**"), between the Company and the Trustee.

RECITALS OF THE COMPANY

WHEREAS, pursuant to the Indenture, the Company issued $225,500,000 aggregate principal amount of 2.50% Convertible Senior Notes due 2026 (the "**Notes**");

WHEREAS, pursuant to the Agreement and Plan of Merger (the "**Merger Agreement**"), dated as of December 23, 2025, among Sanofi, a French *société anonyme* ("**Sanofi**"), Samba Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Sanofi ("**Purchaser**"), and the Company, Purchaser will merge with and into the Company, with the Company continuing as the surviving corporation and a wholly owned subsidiary of Sanofi (the "**Merger**");

WHEREAS, pursuant to the Merger Agreement, at the Effective Time (as defined in the Merger Agreement) (the "**Effective Time**"), each share of Company Common Stock (as defined in the Merger Agreement) ("**Common Stock**") issued and outstanding immediately prior to the Effective Time (other than certain shares of Common Stock as set forth in the Merger Agreement) will be converted into the right to receive $15.50 in cash, without interest;

WHEREAS, the Merger shall be consummated on the date hereof in accordance with the Merger Agreement immediately following the execution and delivery of this Supplemental Indenture;

WHEREAS, pursuant to Section 14.07(a) of the Indenture, the Merger constitutes a Share Exchange Event, and the Company and the Trustee are required to enter into a supplemental indenture providing that from and after the Effective Time the right to convert each $1,000 principal amount of Notes shall be changed into a right to convert such principal amount of Notes into units of Reference Property;

WHEREAS, pursuant to the terms of the Merger Agreement and Section 14.07(a) of the Indenture, each unit of Reference Property consists of $15.50 in cash;

WHEREAS, Section 10.01(g) of the Indenture provides that the Company and the Trustee may enter into a supplemental indenture, without the consent of the Holders of any of the Notes at the time outstanding, in connection with any Share Exchange Event to provide that the Notes are convertible into Reference Property, subject to the provisions of Section 14.02 of the Indenture, and to make related changes to the terms of the Notes to the extent expressly required by Section 14.07 of the Indenture;

------

WHEREAS, in connection with the execution and delivery of this Supplemental Indenture, the Trustee has received an Officer's Certificate and an Opinion of Counsel as contemplated by Sections 10.05, 14.07(b) and 17.05 of the Indenture;

WHEREAS, the Company has requested that the Trustee execute and deliver this Supplemental Indenture; and

WHEREAS, all conditions precedent provided for in the Indenture relating to the execution of this Supplemental Indenture have been complied with.

NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH, for and in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties hereto mutually covenant and agree for the equal and proportionate benefit of the Holders as follows:

ARTICLE I

TERMS

Section 1.01 *Definitions in the Supplemental Indenture*. Unless otherwise specified herein or the context otherwise requires:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) a term defined in the Indenture has the same meaning when used in this Supplemental Indenture unless the *definition* of such term is amended or supplemented pursuant to this Supplemental Indenture;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) the terms defined in this Article and in this Supplemental Indenture include the plural as well as the singular; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) unless otherwise stated, a reference to a Section or Article is to a Section or Article of this Supplemental Indenture.

ARTICLE II

EFFECT OF MERGER

Section 2.01 *Conversion Right*. Pursuant to Section 14.07(a) of the Indenture, from and after the Effective Time, (a) the right to convert each $1,000 principal amount of Notes shall be changed into a right to convert such principal amount of Notes into the Reference Property, which Reference Property shall be solely cash in an amount equal to the Conversion Rate in effect on the Conversion Date (as may be increased by Additional Shares pursuant to Section 14.03 of the Indenture), multiplied by $15.50; and a unit of Reference Property under the Indenture will be comprised of an amount in cash equal to $15.50, (b) the Company shall satisfy its Conversion Obligation by paying cash to converting Holders on the second Business Day immediately following the relevant Conversion Date, (c) the Conversion Rate will be adjusted in the same manner as, and at the same time and for the same events for which, the Conversion Rate is adjusted pursuant to Section 14.04 of the Indenture in a manner consistent with Section 14.07 of the Indenture, and (d) the Daily VWAP of a unit of Reference Property shall be $15.50.<u> </u>

------

ARTICLE III

ACCEPTANCE OF SUPPLEMENTAL INDENTURE

Section 3.01 *Trustee's Acceptance*. The Trustee hereby accepts this Supplemental Indenture and agrees to perform the same under the terms and conditions set forth in the Indenture.

ARTICLE IV

MISCELLANEOUS PROVISIONS

Section 4.01 *Governing Law; Waiver of Trial by Jury*. THIS SUPPLEMENTAL INDENTURE AND ANY CLAIM, CONTROVERSY OR DISPUTE ARISING UNDER OR RELATED TO THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

EACH OF THE COMPANY AND THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE OR THE TRANSACTIONS CONTEMPLATED HEREBY.

Section 4.02 *Benefits of Supplemental Indenture*. Nothing in this Supplemental Indenture, expressed or implied, shall give to any Person, other than the Holders, the parties hereto, any Paying Agent, any Conversion Agent, any authenticating agent, any Note Registrar and their successors hereunder, any benefit or any legal or equitable right, remedy or claim under this Supplemental Indenture.

Section 4.03 *Execution in Counterparts*. This Supplemental Indenture may be executed in any number of counterparts, each of which shall be an original, but such counterparts shall together constitute but one and the same instrument. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes.

Section 4.04 *Severability*. In the event any provision of this Supplemental Indenture shall be invalid, illegal or unenforceable, then (to the extent permitted by law) the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired.

Section 4.05 *Ratification of Indenture*. The Indenture, as supplemented by this Supplemental Indenture, is in all respects ratified and confirmed, and this Supplemental Indenture shall be deemed part of the Indenture in the manner and to the extent herein provided.

Section 4.06 *Effect on Successors and Assigns*. Notwithstanding Section 17.08 of the Indenture, all agreements of the Company, the Trustee, the Note Registrar, the Paying Agent and the Conversion Agent in this Supplemental Indenture will bind their respective successors.

------

Section 4.07 *Headings, Etc*. The titles and headings of the articles and sections of this Supplemental Indenture have been inserted for convenience of reference only, are not to be considered a part hereof, and shall in no way modify or restrict any of the terms or provisions hereof.

Section 4.08 *Trustee Makes No Representation*. The Trustee makes no representations as to the validity or sufficiency of this Supplemental Indenture. The recitals and statements contained in this Supplemental Indenture shall be taken as the statements of the Company, and the Trustee assumes no responsibility for the correctness of the same. The Trustee is not charged with any knowledge of the Merger Agreement or any of the terms thereof.

[*Signature Pages Follow*]

------

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed as of the day and year first written above.

---

| | |
|:---|:---|
| **DYNAVAX TECHNOLOGIES CORPORATION** | **DYNAVAX TECHNOLOGIES CORPORATION** |
| By: |  |
|  | Name: |
|  | Title: |

---

[Signature Page to the Supplemental Indenture]

------

---

| | |
|:---|:---|
| **U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION**, as Trustee | **U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION**, as Trustee |
| By: |  |
|  | Name: |
|  | Title: |

---

[Signature Page to the Supplemental Indenture]

## Exhibit 4.2

**Exhibit 4.2** 

FIRST SUPPLEMENTAL INDENTURE

FIRST SUPPLEMENTAL INDENTURE, dated as of February 10, 2026 (this "**Supplemental Indenture**"), by and between Dynavax Technologies Corporation, a Delaware corporation, as issuer (the "**Company**"), and U.S. Bank Trust Company, National Association, as trustee (the "**Trustee**"), supplements the Indenture dated March 13, 2025 (as supplemented or otherwise modified prior to the date hereof, the "**Indenture**"), between the Company and the Trustee.

RECITALS OF THE COMPANY

WHEREAS, pursuant to the Indenture, the Company issued $225,000,000 aggregate principal amount of 2.00% Convertible Senior Notes due 2030 (the "**Notes**");

WHEREAS, pursuant to the Agreement and Plan of Merger (the "**Merger Agreement**"), dated as of December 23, 2025, among Sanofi, a French *société anonyme* ("**Sanofi**"), Samba Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Sanofi ("**Purchaser**"), and the Company, Purchaser will merge with and into the Company, with the Company continuing as the surviving corporation and a wholly owned subsidiary of Sanofi (the "**Merger**");

WHEREAS, pursuant to the Merger Agreement, at the Effective Time (as defined in the Merger Agreement) (the "**Effective Time**"), each share of Company Common Stock (as defined in the Merger Agreement) ("**Common Stock**") issued and outstanding immediately prior to the Effective Time (other than certain shares of Common Stock as set forth in the Merger Agreement) will be converted into the right to receive $15.50 in cash, without interest;

WHEREAS, the Merger shall be consummated on the date hereof in accordance with the Merger Agreement immediately following the execution and delivery of this Supplemental Indenture;

WHEREAS, pursuant to Section 14.07(a) of the Indenture, the Merger constitutes a Share Exchange Event, and the Company and the Trustee are required to enter into a supplemental indenture providing that from and after the Effective Time the right to convert each $1,000 principal amount of Notes shall be changed into a right to convert such principal amount of Notes into units of Reference Property;

WHEREAS, pursuant to the terms of the Merger Agreement and Section 14.07(a) of the Indenture, each unit of Reference Property consists of $15.50 in cash;

WHEREAS, Section 10.01(g) of the Indenture provides that the Company and the Trustee may enter into a supplemental indenture, without the consent of the Holders of any of the Notes at the time outstanding, in connection with any Share Exchange Event to provide that the Notes are convertible into Reference Property, subject to the provisions of Section 14.02 of the Indenture, and to make related changes to the terms of the Notes to the extent expressly required by Section 14.07 of the Indenture;

------

WHEREAS, in connection with the execution and delivery of this Supplemental Indenture, the Trustee has received an Officer's Certificate and an Opinion of Counsel as contemplated by Sections 10.05, 14.07(b) and 17.05 of the Indenture;

WHEREAS, the Company has requested that the Trustee execute and deliver this Supplemental Indenture; and

WHEREAS, all conditions precedent provided for in the Indenture relating to the execution of this Supplemental Indenture have been complied with.

NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH, for and in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties hereto mutually covenant and agree for the equal and proportionate benefit of the Holders as follows:

ARTICLE I

TERMS

Section 1.01 *Definitions in the Supplemental Indenture*. Unless otherwise specified herein or the context otherwise requires:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) a term defined in the Indenture has the same meaning when used in this Supplemental Indenture unless the *definition* of such term is amended or supplemented pursuant to this Supplemental Indenture;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) the terms defined in this Article and in this Supplemental Indenture include the plural as well as the singular; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) unless otherwise stated, a reference to a Section or Article is to a Section or Article of this Supplemental Indenture.

ARTICLE II

EFFECT OF MERGER

Section 2.01 *Conversion Right*. Pursuant to Section 14.07(a) of the Indenture, from and after the Effective Time, (a) the right to convert each $1,000 principal amount of Notes shall be changed into a right to convert such principal amount of Notes into the Reference Property, which Reference Property shall be solely cash in an amount equal to the Conversion Rate in effect on the Conversion Date (as may be increased by Additional Shares pursuant to Section 14.03 of the Indenture), multiplied by $15.50; and a unit of Reference Property under the Indenture will be comprised of an amount in cash equal to $15.50, (b) the Company shall satisfy its Conversion Obligation by paying cash to converting Holders on the second Business Day immediately following the relevant Conversion Date, (c) the Conversion Rate will be adjusted in the same manner as, and at the same time and for the same events for which, the Conversion Rate is adjusted pursuant to Section 14.04 of the Indenture in a manner consistent with Section 14.07 of the Indenture, and (d) the Daily VWAP of a unit of Reference Property shall be $15.50.<u> </u>

------

ARTICLE III

ACCEPTANCE OF SUPPLEMENTAL INDENTURE

Section 3.01 *Trustee's Acceptance*. The Trustee hereby accepts this Supplemental Indenture and agrees to perform the same under the terms and conditions set forth in the Indenture.

ARTICLE IV

MISCELLANEOUS PROVISIONS

Section 4.01 *Governing Law; Waiver of Trial by Jury*. THIS SUPPLEMENTAL INDENTURE AND ANY CLAIM, CONTROVERSY OR DISPUTE ARISING UNDER OR RELATED TO THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

EACH OF THE COMPANY AND THE TRUSTEE HEREBY IRREVOCABLY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS SUPPLEMENTAL INDENTURE OR THE TRANSACTIONS CONTEMPLATED HEREBY.

Section 4.02 *Benefits of Supplemental Indenture*. Nothing in this Supplemental Indenture, expressed or implied, shall give to any Person, other than the Holders, the parties hereto, any Paying Agent, any Conversion Agent, any authenticating agent, any Note Registrar and their successors hereunder, any benefit or any legal or equitable right, remedy or claim under this Supplemental Indenture.

Section 4.03 *Execution in Counterparts*. This Supplemental Indenture may be executed in any number of counterparts, each of which shall be an original, but such counterparts shall together constitute but one and the same instrument. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile or PDF shall be deemed to be their original signatures for all purposes.

Section 4.04 *Severability*. In the event any provision of this Supplemental Indenture shall be invalid, illegal or unenforceable, then (to the extent permitted by law) the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired.

Section 4.05 *Ratification of Indenture*. The Indenture, as supplemented by this Supplemental Indenture, is in all respects ratified and confirmed, and this Supplemental Indenture shall be deemed part of the Indenture in the manner and to the extent herein provided.

Section 4.06 *Effect on Successors and Assigns*. Notwithstanding Section 17.08 of the Indenture, all agreements of the Company, the Trustee, the Note Registrar, the Paying Agent and the Conversion Agent in this Supplemental Indenture will bind their respective successors.

------

Section 4.07 *Headings, Etc*. The titles and headings of the articles and sections of this Supplemental Indenture have been inserted for convenience of reference only, are not to be considered a part hereof, and shall in no way modify or restrict any of the terms or provisions hereof.

Section 4.08 *Trustee Makes No Representation*. The Trustee makes no representations as to the validity or sufficiency of this Supplemental Indenture. The recitals and statements contained in this Supplemental Indenture shall be taken as the statements of the Company, and the Trustee assumes no responsibility for the correctness of the same. The Trustee is not charged with any knowledge of the Merger Agreement or any of the terms thereof

[*Signature Pages Follow*]

------

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed as of the day and year first written above.

---

| | |
|:---|:---|
| **DYNAVAX TECHNOLOGIES CORPORATION** | **DYNAVAX TECHNOLOGIES CORPORATION** |
| By: |  |
|  | Name: |
|  | Title: |

---

[Signature Page to the Supplemental Indenture]

------

---

| | |
|:---|:---|
| **U.S. BANK TRUST COMPANY, NATIONAL<br>ASSOCIATION**, as Trustee | **U.S. BANK TRUST COMPANY, NATIONAL<br>ASSOCIATION**, as Trustee |
| By: |  |
|  | Name: |
|  | Title: |

---

[Signature Page to the Supplemental Indenture]

## Exhibit 10.1

**Exhibit 10.1** 

[Name]

[Date]

Dear [Name]:

As you know, Dynavax Technologies Corporation, a Delaware corporation (the "<u>Company</u>") entered into an Agreement and Plan of Merger, dated as of December 23, 2025, with SANOFI, a French *société anonyme* ("<u>Parent</u>") and Samba Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Parent (the "<u>Merger Agreement</u>"). Capitalized terms used but not defined herein shall have the meanings ascribed to such terms in the Merger Agreement.

In recognition of your service to the Company and contingent upon the Closing, the Company has approved the Gross-Up Payment(s) (as defined below) to be made to you, to the extent required, and on the terms and conditions set forth in this letter agreement between you and the Company (this "<u>Agreement</u>"). This Agreement and the Gross-Up Payment(s) provided for herein shall replace and supersede any other agreements and promises made to you by the Company, whether written or oral, with respect to the subject matter herein, including any provision in any Employee Plan or other agreement between you and the Company (which, for the avoidance of doubt, is inclusive of Section 10 of your Management Continuity and Severance Agreement with the Company), providing for different treatment with respect to payments subject to Section 280G of the Internal Revenue Code of 1986, as amended, and the regulations and guidance issued thereunder (the "<u>Code</u>"). For the avoidance of doubt, if the Closing does not occur, you will not receive a Gross-Up Payment and this Agreement shall be null and void *ab initio*.

1. Notwithstanding anything to the contrary in any Employee Plan, if any compensatory payment or benefit
(including payments and benefits received pursuant to this Agreement) you receive (or retain) in connection with the Merger, and the transactions contemplated by the Merger Agreement, from the Company or otherwise (each, a
" <u>Payment</u> "), other than an Excluded Payment (as defined in the Company Disclosure Letter to the Merger Agreement), would (i) constitute a "parachute payment" within the meaning of Section 280G of the Code, and
(ii) be subject to the excise tax imposed by Section 4999 of the Code (the " <u>Excise Tax</u> "), then the Company shall pay, and you shall be entitled to receive from the Company, an additional payment or payments in an amount
equal to such Excise Tax (the " <u>Excise Tax Payment(s)</u> ") plus the amount necessary to put you in the same after-tax position (taking into account (a) any income or employment taxes,
(b) any interest or penalties imposed with respect to such taxes other than any interest or penalties (other than any underlying excise taxes owed under Section 4999 of the Code) from which you are held harmless as contemplated by Sections
2 and 3, and (c) any additional Excise Tax imposed by Section 4999 of the Code) as if you had not received the Excise Tax Payment(s) (the " <u>Make Whole Payment(s)</u> " and collectively with the Excise Tax Payment(s), the
" <u>Gross-Up Payment(s)</u> "). Notwithstanding anything to the contrary herein, (A) you shall not be entitled to a Gross-Up Payment if the aggregate
amount of your Payments do not exceed 105% of the amount which is three times your "base amount" (within the meaning of Section 280G of the Code) and (B) the maximum aggregate value of the Gross-Up Payment(s) (other than Contest Indemnification Payments (as defined below) and any interest or penalties (other than any underlying excise taxes owed under Section 4999 of the Code) from which
you are held harmless as contemplated by Sections 2 and 3) that may be paid to you or to a taxing authority on your behalf shall not exceed an aggregate amount of $[____] (the " <u>Maximum Payment Amount</u> ") and, if the aggregate amount
of such Gross-Up Payment(s) paid or payable to you exceeds the Maximum Payment Amount, then such Gross-Up Payment(s) shall be reduced such that the aggregate amount of
such Gross-Up Payment(s) payable to you equals the Maximum Payment Amount. The Company's obligation to make any Gross-Up Payment(s) or Contest Indemnification
Payment(s) under this Agreement shall not be conditioned upon your continued employment or termination of employment or the reduction of any amount of payments or benefits otherwise due or payable to you in connection with the transactions
contemplated by the Merger Agreement.

------

2. All determinations required to be made under this Agreement, including whether and when a Gross-Up Payment is required, the amount of any such Gross-Up Payment, the allocation of the value of any mitigation actions and the assumptions to be utilized in arriving at
such determination, shall be made by a public accounting firm or other consultant selected by, and acting at the direction of, the Company (the " <u>Accounting Firm</u> "). For purposes of this Agreement, " <u>Accounting Firm</u> " means Golden Parachute Tax Solutions LLC, provided, that, if Golden Parachute Tax Solutions LLC withdraws, or is terminated, from its provision of services to the Company with respect to this Agreement, then Accounting Firm shall
mean an independent nationally recognized accounting firm or other consultant selected by the Company. For purposes of determining the amount of the Gross-Up Payment(s), you shall be deemed to have:
(x) paid federal income taxes at the highest marginal rate of federal income and employment taxation applicable to you for the calendar year in which the Gross-Up Payment(s) (or a portion thereof) is to
be made, and (y) paid applicable state and local income taxes at the highest rate of taxation applicable to you for the calendar year in which the Gross-Up Payment(s) (or a portion thereof) is to be made
(based on the state in which you reside at the relevant time), net of the maximum reduction in federal income taxes which could be obtained from deduction of such state and local taxes. The Accounting Firm may make such other reasonable assumptions
and approximations concerning applicable taxes and may rely on reasonable, good-faith interpretations concerning the application of Sections 280G and 4999 of the Code to the Payments. The Company shall request that the Accounting Firm provide
detailed supporting calculations to both Parent and you within fifteen (15) business days of a Payment or such earlier time as is reasonably requested by Parent. All fees and expenses of the Accounting Firm shall be borne solely by Parent or
the Company. Parent shall have a reasonable opportunity to review and comment on any draft determination by the Accounting Firm. Following final determination by the Accounting Firm, any such determination shall be binding upon Parent, the Company
and you (unless such determination is later determined to be an Incorrect Determination (as defined below)).

As a result of the uncertainty in the application of Sections 280G and 4999 of the Code, if the initial determination of the Accounting Firm with respect to any Payment is later determined to be incorrect by Parent, the Company and/or a taxing authority (an "<u>Incorrect Determination</u>"), the Gross-Up Payment(s) will be redetermined by the Accounting Firm, at the direction of the Company, in accordance with the applicable Treasury regulations, and the amount of the Gross-Up Payment(s) payable to you or to any taxing authority on your behalf will be redetermined by the Accounting Firm. In such event, (i) subject to the Maximum Payment Amount (set forth above), the Company shall pay to you or to the relevant taxing authority on your behalf any resulting underpayment, or you shall return to the Company any resulting overpayment refund that is paid to you thereafter by any taxing authority and (ii) the Company shall pay to you the amount necessary such that, on an after-tax basis, you are held harmless for any interest or penalties imposed by the applicable taxing authority as a result of your underpayment of taxes as a result of the Incorrect Determination. Except as hereinafter set forth in the case of a claim made by a taxing authority, following approval by Parent, any determination (or redetermination, if applicable) of the amount of the Gross-Up Payment(s) shall be binding upon Parent, the Company and you, and you agree that, absent manifest error, you shall file all tax returns in respect of the relevant tax years consistently with such determination (or redetermination, if applicable).

3. You shall notify Parent in writing of any claim by any taxing authority that, if successful, would require the
payment by the Company of any Gross-Up Payment(s). Such notification shall be given as soon as practicable, but no later than ten (10) business days after you are informed in writing of such

------

claim. You are required to provide Parent with a copy of the notice of claim by the taxing authority and the date set forth in the claim that the taxing authority specifies as the due date for payment of such claim. You may not pay such claim prior to the expiration of the thirty (30) day period following the date on which you give such notice to Parent (or such shorter period ending on the date that any payment of taxes with respect to such claim is due).

If Parent or the Company does not notify you in writing prior to the expiration of such thirty (30) day period (or such shorter period ending on the date that any payment of taxes with respect to such claim is due) that Parent desires to contest such claim, the Company shall, within fifteen (15) business days after the expiration of such thirty (30) day period (or such shorter period ending on the date that any payment of taxes with respect to such claim is due), pay to you or to any taxing authority on your behalf (i) the amount (subject to the Maximum Payment Amount) claimed to be due by the taxing authority plus the amount necessary to put you in the same after-tax position as if you had not received such amount, in accordance with the methodology applicable to the determination of the Gross-Up Payment(s) set forth in <u>Section</u> <u>1</u>, such that, on an after-tax basis you are held harmless for any Excise Tax or any other tax (including interest or penalties thereon) imposed with respect to the payment required to be made by the Company to you or to any taxing authority on your behalf pursuant to this sentence, and (ii) the amount necessary such that, on an after tax basis, you are held harmless for any interest or penalties (other than any underlying excise taxes owed under Section 4999 of the Code) imposed by the applicable taxing authority as a result of your underpayment of taxes as a result of the Incorrect Determination.

Without prejudice to the obligation to hold you harmless for interest or penalties (other than any underlying excise taxes owed under Section 4999 of the Code) imposed by the applicable taxing authority as a result of any underpayment by you of taxes as a result of the Incorrect Determination, if Parent or the Company notifies you in writing prior to the expiration of such thirty (30) day period (or such shorter period ending on the date that any payment of taxes with respect to such claim is due) that Parent desires that you contest such claim with the taxing authority (including without limitation by paying the tax claimed and suing for a refund) (such contest with the taxing authority, the "<u>Contest</u>"), you must (i) give Parent any information reasonably requested by Parent relating to such claim, (ii) take such action in connection with contesting such claim as Parent shall reasonably request in writing from time to time, including, without limitation, accepting legal representation with respect to such claim by an attorney reasonably selected by Parent, (iii) cooperate with Parent in good faith in order to effectively contest such claim, and (iv) permit Parent to participate in any proceedings relating to such claim; provided, however, that the Company shall cause Parent to bear and pay directly all costs and expenses (including additional taxes, interest and penalties, all attorneys' fees and expenses in respect of any attorney that Parent selects or retains and other reasonable professional fees) incurred in connection with such Contest, and shall indemnify and hold you harmless, on an after-tax basis, for any Excise Tax or any other tax (including interest or penalties thereon) imposed and any such costs and expenses incurred by you during your lifetime (or by your estate while such estate is in existence) as a result of such Contest (such payments made to so indemnify and hold you harmless (on an after-tax basis) with respect to any costs or expenses (e.g., professional fees and interest) incurred solely as a result of such Contest, the "<u>Contest Indemnification Payments</u>"). Notwithstanding anything to the contrary in this Agreement, no Contest Indemnification Payments made to you shall count towards the Maximum Payment Amount. For the avoidance of doubt, for purposes of the preceding sentence, (i) any costs and expenses (e.g., professional fees and interest (on an after-tax basis)) constituting additional income to you as a result of any such Contest shall be deemed "Contest Indemnification Payments" and (ii) any Gross-Up Payments that relate to payments that were (or would have been) made to you irrespective of a Contest shall not be deemed "Contest Indemnification Payments" and shall count towards the Maximum Payment Amount.

------

Without limitation of the foregoing provisions of this Agreement, Parent or the Company shall control all proceedings taken in connection with such Contest, and, at its sole discretion, may pursue or forgo any and all administrative appeals, proceedings, hearings and conferences with the taxing authority in respect of such claim and may, at its sole discretion, either direct you to pay the tax claimed and sue for a refund or Contest the claim in any other permissible manner, and you agree to prosecute such Contest to a determination before any administrative tribunal, in a court of initial jurisdiction and in one or more appellate courts, as Parent shall determine; provided, however, that (A) if Parent or the Company directs you to pay such claim and sue for a refund, the Company shall advance the amount of such payment to you, on an interest-free basis, and shall indemnify and hold you harmless, on an after-tax basis, from any Excise Tax or income or employment tax (including interest or penalties thereon) imposed with respect to such advance, including any forgiveness thereof, or with respect to any imputed income in connection with such advance and (B) if such Contest results in any extension of the statute of limitations relating to payment of taxes for your taxable year with respect to which such contested amount is claimed to be due, such extension must be limited solely to such contested amount. Furthermore, the Company or Parent's control of the Contest shall be limited to issues with respect to which the Gross-Up Payment(s) would be payable hereunder, and you are entitled to settle or contest, as the case may be, any other issue raised by the taxing authority.

4. If, after the receipt by you of any Gross-Up Payment(s) or payment by
the Company of an amount on your behalf pursuant to this Agreement, you become entitled to receive any refund with respect to the Excise Tax or the Gross-Up Payment(s), as determined by you and/or your
personal accountants, in good faith, following good faith consultation with Parent or the Company, you shall promptly pay to the Company the amount of such refund following receipt thereof (together with any interest paid or credited thereon after
taxes applicable thereto). If, after payment by the Company of an amount on your behalf, a determination is made that you shall not be entitled to any refund with respect to such claim and Parent or the Company does not notify you in writing of its
intent to contest such denial of refund prior to the expiration of thirty (30) days after such determination, then the amount of such payment shall offset, to the extent thereof, the amount of the Gross-Up Payment(s) required to be paid and shall count towards the Maximum Payment Amount.

5. It is intended that the Gross-Up Payment(s) and Contest Indemnification
Payment(s) satisfy an exemption from, or comply with, Section 409A of the Code and the Treasury Regulations promulgated thereunder. To the maximum extent possible, this Agreement shall be construed accordingly. The amount of Gross-Up Payment(s) or Contest Indemnification Payment(s) provided during any year will not affect the amount of Gross-Up Payment(s) or Contest Indemnification Payment(s) you
may receive in any other year. The right to receive any Gross-Up Payment(s) or Contest Indemnification Payment(s) is not subject to liquidation or exchange for another benefit.

6. Any Gross-Up Payment(s), as determined pursuant to this Agreement,
shall be paid by the Company to you (subject to all required applicable withholdings) no later than the date that the corresponding withholding of the Excise Tax or other amount is required to be remitted to the Internal Revenue Service or any other
applicable taxing authority or, in the case of amounts relating to a claim described in <u>Section</u> <u>3</u> that does not result in the remittance of any federal, state, local and foreign income, excise, social security and other
taxes, the calendar year in which the claim is finally settled or otherwise resolved. Notwithstanding any other provision of this Agreement, the Company may, in its sole discretion, withhold and pay over to the Internal Revenue Service or any other
applicable taxing authority, for the benefit of you, all or any portion of any Gross-Up Payment(s), and you hereby consent to such withholding and such amounts withheld shall count towards the Maximum Payment
Amount. Subject to you providing reasonable evidence substantiating the applicable costs and expenses no later than thirty-one (31) days prior to the last day of the year following the year in

------

which the applicable cost or expense was incurred, any Contest Indemnification Payments (other than Gross-Up Payments) and other amounts due to you as a result of your underpayment of taxes as a result of an Incorrect Determination) shall be paid by the Company to you (subject to all required applicable withholdings) within thirty (30) days after you provide the Company with such substantiation of the applicable costs and expenses.

7. This Agreement is intended to bind and inure to the benefit of and be enforceable by you, the Company, and the
Surviving Corporation and any other person or entity who is a successor by merger, acquisition, consolidation or otherwise to the business formerly carried on by the Company, and their respective successors, assigns, heirs, executors and
administrators, without regard to whether or not such person or entity actively assumes any rights or duties hereunder; provided, however, that (i) you may not assign any duties hereunder and may not assign any rights hereunder (other than by
will or the laws of descent and distribution) without the written consent of the Company, which consent shall not be unreasonably withheld, conditioned or delayed and (ii) the Company may not assign any duties or rights hereunder (other than to
an Affiliate, in which case the Company, as applicable, shall remain liable hereunder) without your written consent, which consent shall not be unreasonably withheld, conditioned or delayed. If you shall die while any amounts would be payable to you
hereunder had you continued to live, all such amounts, unless otherwise provided herein, shall be paid in accordance with the terms of this Agreement to such person or persons appointed in writing to you to receive such amounts or, if no person is
so appointed, to your estate. This Agreement sets forth the entire agreement between you and the Company with respect to Sections 280G and 4999 of the Code and any Gross-Up Payment(s) or Contest
Indemnification Payment(s) to be provided to you or on your behalf relating to such Sections 280G and 4999, and supersedes all prior and contemporaneous communications, agreements, and understandings, written or oral, with respect thereto (which,
for the avoidance of doubt, is inclusive of Section 10 of your Management Continuity and Severance Agreement with the Company). This Agreement may not be modified or amended, and no breach shall be deemed to be waived, unless agreed to in
writing by you and the Company. This Agreement may be executed in two or more counterparts, each of which shall be an original and all of which together shall constitute one and the same instrument. The parties agree that this Agreement may be
executed and delivered by electronic signatures and that the signatures appearing on this Agreement are the same as handwritten signatures for the purposes of validity, enforceability and admissibility. This Agreement shall be governed and construed
in accordance with the laws of the State of [____], without regard to any conflict of laws principles that would result in the application of the laws of any jurisdiction.

8. All notices, requests, claims, demands and other communications hereunder must be in writing and must be given
(and will be deemed to have been duly given): (a) when delivered, if delivered in Person, (b) when sent, if sent by email, (c) three (3) Business Days after sending, if sent by registered or certified mail (postage prepaid, return receipt
requested) and (d) one (1) Business Day after sending, if sent by overnight courier, in each case, to the respective parties at the following addresses (or at such other address for a party as has been specified by like notice):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i. if to Parent or the Company:

SANOFI

46, avenue de la Grande-Armée

75017 Paris – France

Attention: [\*\*\*\*]

Email: [\*\*\*\*]

with an additional copy (which will not constitute notice) to:

------

Weil, Gotshal & Manges LLP

767 5th Avenue

New York, NY 10153

Attention: Michael J. Aiello; Sachin Kohli

Email: michael.aiello@weil.com; sachin.kohli@weil.com

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ii. if to you:

the email address listed below your signature, with an additional copy (which will not constitute notice) to your last known mailing address as reflected in the Company's records.

[Signature Page Follows]

------

The parties have executed this Agreement effective as of the latest date stated by the parties' signatures.

Dynavax Technologies Corporation

---

| | |
|:---|:---|
|  By: |  |
|  | Name: |
|  | Title: |
|  | Date: |

---

---

| | |
|:---|:---|
|  Accepted and Agreed: | |
|  | [Name]: |
|  | Title: |
|  | Email Address: |

---