Gritstone Securities Litigation Online Claim Form

This form allows you to file your claim online securely through our website.

Before you begin:
Please have the following items ready to go before you begin filing your online claim form; it will make the process easier for you.
• You should have copies of your statements for the relevant date ranges so that you can enter your transactions.
• You should have copies of these statements scanned and saved on your computer so that you can upload them as proof. We prefer files in PDF format, but we can accept most file formats.

1. General Instructions
Please read this important information about the case. It provides important details you should understand before you file your claim.

2. Claimant Identification / Information
Please enter your current contact information to assist us in identifying your claim and contacting you for additional information and updates.

We recommend you turn off auto-fill settings in your browser to ensure incorrect information is not added by mistake. You will receive a confirmation email that we received your claim at the email address you provide.

Important: Double check the information before you click Nextas you will not have the opportunity to review it again prior to submitting.

3. Schedule of Transactions
Please read the instructions carefully and enter your relevant transactions. You must ensure that the number of shares in beginning holdings, plus purchases/acquisitions, minus sales, minus ending holdings equals zero. This ensures that all relevant transactions are accounted for. The form will not allow you to continue until all outstanding shares are accounted for.

4. Documentation
Please drag and drop your files or click Select Files to choose the documents you will provide as proof of your transactions and holdings.

Trade confirmations and monthly statements from your brokerage firm are typically the best documents to use as proof.

Once a file upload completes, the file name will appear below the upload box. You may click the trash can icon to remove a file if it was added in error.

5. Release of Claims, Certification, and Signature

Please read the Release of Claims and Certification. By typing your name and date in the fields provided, you are signing the document and certifying that all information submitted is true, correct, and complete.

After you click the submit button
Within a few minutes of submitting your claim, you will receive a confirmation email from us that contains your Form ID along with the information you submitted.

If you need to make any amendments to your claim, please reference the Form ID you received. Please check your spam folder if you did not receive the email confirmation in your inbox.

GENERAL INSTRUCTIONS

To be eligible to receive a share of the Net Settlement Fund in connection with the Settlement of this Action, you must complete and sign this Proof of Claim and Release Form (“Claim Form”) and mail it by first-class mail to the address below, or submit it online by clicking Next below and following all the instructions with supporting documentation, postmarked (if mailed) or online no later than November 13, 2026.

Failure to submit your Claim Form by the date specified will subject your claim to rejection and may preclude you from being eligible to receive any money in connection with the Settlement.

Do not mail or deliver your Claim Form to the Court, the Parties to the Action, or their counsel. Submit your Claim Form only to the Claims Administrator.

1. 1. It is important that you completely read the Notice of (I) Pendency of Class Action and Proposed Settlement; (II) Settlement Fairness Hearing; and (III) Motion for an Award of Attorneys’ Fees and Reimbursement of Litigation Expenses (the “Notice”) that accompanies this Claim Form, including the Plan of Allocation of the Net Settlement Fund set forth in the Notice.^[1] The Notice is also available on the Settlement website at www.strategicclaims.net/Gritstone/. The Notice describes the proposed Settlement, how Settlement Class Members are affected by the Settlement, and the manner in which the Net Settlement Fund will be distributed if the Settlement and Plan of Allocation are approved by the Court. The Notice also contains the definitions of many of the defined terms (which are indicated by initial capital letters) used in this Claim Form. By signing and submitting this Claim Form, you will be certifying that you have read and that you understand the Notice, including the terms of the releases described therein and provided for herein.


2. 2. By submitting this Claim Form, you will be making a request to share in the proceeds of the Settlement described in the Notice. If you are not a Settlement Class Member (see the definition of the Settlement Class on page 5 of the Notice), do not submit a Claim Form. You may not, directly or indirectly, participate in the Settlement if you are not a Settlement Class Member. Thus, if you are excluded from the Settlement Class, any Claim Form that you submit, or that may be submitted on your behalf, will not be accepted.


3. 3. Submission of this Claim Form does not guarantee that you will share in the proceeds of the Settlement. The distribution of the Net Settlement Fund will be governed by the Plan of Allocation set forth in the Notice or by such other plan of allocation as the Court approves.


4. 4. On the Schedule of Transactions of this Claim Form, provide all of the requested information with respect to your holdings, purchases, acquisitions, and sales of Gritstone bio, Inc. common stock (“Gritstone Securities”), regardless of whether such transactions resulted in a profit or a loss. Failure to report all transaction and holding information for Gritstone Securities during the requested time period may result in the rejection of your claim.


5. 5. Please note: Only publicly-traded Gritstone Securities purchased between March 9, 2023 and April 2, 2024, both dates inclusive, are eligible under the Settlement and the proposed Plan of Allocation set forth in the Notice. However, under the “90-day look-back period” (described in the Plan of Allocation) and the statutory formula set forth in the Securities Act of 1933, transactions in Gritstone Securities through as late as June 28, 2024 will be used for purposes of calculating certain Recognized Loss amounts under the Plan of Allocation. Therefore, in order for the Claims Administrator to be able to balance your claim, the requested transaction information during the 90-day look-back period must also be provided.


6. 6. You are required to submit genuine and sufficient documentation for all of your transactions in and holdings of Gritstone Securities set forth in the Schedule of Transactions of this Claim Form. Documentation may consist of copies of brokerage confirmation slips or monthly brokerage account statements, or an authorized statement from your broker containing the transactional and holding information found in a broker confirmation slip or account statement. The Parties and the Claims Administrator do not independently have information about your investments. IF SUCH DOCUMENTS ARE NOT IN YOUR POSSESSION, PLEASE OBTAIN COPIES OF THE DOCUMENTS OR EQUIVALENT DOCUMENTS FROM YOUR BROKER. FAILURE TO SUPPLY THIS DOCUMENTATION MAY RESULT IN THE REJECTION OF YOUR CLAIM. DO NOT SEND ORIGINAL DOCUMENTS.


7. 7. Please keep a copy of all documents that you send to the Claims Administrator. Also, do not highlight any portion of the Claim Form or any supporting documents.


8. 8. Use the part of this Claim Form entitled “Claimant Information” to identify the beneficial owner(s) of the Gritstone Securities that are the basis for the claim. The complete name(s) of the beneficial owner(s) must be entered. If you held the Gritstone Securities in your own name, you were the beneficial owner as well as the record owner. If, however, your Gritstone Securities were registered in the name of a third party, such as a nominee or brokerage firm, you were the beneficial owner of these shares, but the third party was the record owner. The beneficial owner, not the record owner, must sign this Claim Form to be eligible to participate in the Settlement. If there were joint beneficial owners, then each must sign this Claim Form, and all of their names must appear as “Claimants” in the Claimant Information portion of this Claim Form.


9. 9. One Claim should be submitted for each separate legal entity or separately managed account. Separate Claim Forms should be submitted for each separate legal entity (e.g., an individual should not combine his or her IRA transactions with transactions made solely in the individual’s name). Generally, a single Claim Form should be submitted on behalf of one legal entity including all holdings and transactions made by that entity on one Claim Form. However, if a single person or legal entity had multiple accounts that were separately managed, separate Claim Forms may be submitted for each such account. The Claims Administrator reserves the right to request information on all the holdings and transactions in Gritstone Securities made on behalf of a single beneficial owner.


10. 10. Agents, executors, administrators, guardians, and trustees must complete and sign the Claim Form on behalf of persons represented by them, and they must:

(a) expressly state the capacity in which they are acting;

(b) identify the name, account number, Social Security Number (or other taxpayer identification number), address, and telephone number of the beneficial owner of (or other person or entity on whose behalf they are acting with respect to) the Gritstone Securities; and

(c) furnish herewith evidence of their authority to bind to the Claim Form the person or entity on whose behalf they are acting. (Authority to complete and sign a Claim Form cannot be established by stockbrokers demonstrating only that they have discretionary authority to trade securities in another person’s accounts.)



11. 11. By submitting a signed Claim Form, you will be swearing that you:

(a) own(ed) the Gritstone Securities you have listed on the Claim Form; or

(b) are expressly authorized to act on behalf of the owner thereof.



12. 12. By submitting a signed Claim Form, you will be swearing to the truth of the statements contained therein and the genuineness of the documents attached thereto, subject to penalties of perjury under the laws of the United States of America. The making of false statements, or the submission of forged or fraudulent documentation, will result in the rejection of your claim and may subject you to civil liability or criminal prosecution.


13. 13. Payments to eligible Authorized Claimants will be made only if the Court approves the Settlement, after any appeals are resolved, and after the completion of all claims processing.


14. 14. PLEASE NOTE: As set forth in the Plan of Allocation, each Authorized Claimant shall receive his, her, or its pro rata share of the Net Settlement Fund. If the prorated payment to any Authorized Claimant calculates to less than $10.00, it will not be included in the calculation, and no distribution will be made to that Authorized Claimant.


15. 15. If you have questions concerning the Claim Form, or need additional copies of the Claim Form or the Notice, you may contact the Claims Administrator, Strategic Claims Services, at the above address, by email at info@strategicclaims.net, or by toll-free phone at (866) 274-4004, or you can visit the website, www.strategicclaims.net/Gritstone/, where copies of the Claim Form and the Notice are available for download.


16. 16. NOTICE REGARDING INSTITUTIONAL FILERS: Certain filers submitting claims on behalf of other beneficial owners (“Representative Filers”) and/or with large numbers of transactions may request to, or may be asked to, submit information regarding their transactions in electronic files. (This is different than the online claim portal on the Settlement website.) All such Representative Filers MUST also submit a manually signed paper Claim Form whether they also submit electronic copies. Claims should be combined on a legal entity basis, where applicable. Sub-accounts should be rolled up into a parent account if the sub-accounts contain the same tax identification number. If you are a Representative Filer and wish to submit your claim electronically, you must contact the Claims Administrator at (866) 274-4004, email at efile@strategicclaims.net, or visit the Settlement website at www.strategicclaims.net/Gritstone/ to obtain the required file layout. No electronic files will be considered to have been properly submitted unless the Claims Administrator issues to the Claimant a written acknowledgment of receipt and acceptance of electronically submitted data.


17. 17. NOTICE REGARDING ONLINE FILING: Claimants who are not Representative Filers may submit their claims online by clicking Next below and following all the instructions. If you are not acting as a Representative Filer, you do not need to contact the Claims Administrator prior to filing. You will receive an automated e-mail confirming receipt once your Claim Form has been submitted. If you are unsure if you should submit your claim as a Representative Filer, please contact the Claims Administrator at info@strategicclaims.net or (866) 274-4004. If you are not a Representative Filer, but your claim contains a large number of transactions, the Claims Administrator may request that you also submit an electronic spreadsheet showing your transactions to accompany your Claim Form.

1. ¹All capitalized terms not otherwise defined in this document shall have the meaning provided in the Notice and the Stipulation of Settlement, dated May 15, 2026 (the “Stipulation”). ↑