SEC FORM 4

SEC FORM 4 SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Jooss Karin

(Last)

(First)

(Middle)

C/O GRITSTONE BIO, INC.

5959 HORTON STREET, SUITE 300

(Street)

EMERYVILLE

94608

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
Gritstone bio, Inc. [ GRTS ]

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

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	SEE REMARKS

3. Date of Earliest Transaction (Month/Day/Year)
05/15/2024

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

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/15/2024		A		27,128⁽¹⁾	A	$0	697,275⁽²⁾	D
Common Stock	05/16/2024		S⁽³⁾		13,749	D	$0.7483⁽⁴⁾	683,526	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (Right to Buy)	$0.75	05/15/2024		A		235,000		⁽⁵⁾	05/14/2034	Common Stock	235,000	$0	235,000	D

Explanation of Responses:

1. Represents Performance Stock Units ("PSUs") granted on March 22, 2024 that were earned by the Reporting Person as a result of the achievement of certain performance criteria as certified by the Issuer's Board of Directors on May 15, 2024. The PSUs vest over one year; 1/2 vested on May 15, 2024, and thereafter the remaining 1/2 will vest on May 15, 2025, subject to the continuing service of the Reporting Person on such vesting date. Each PSU represents a contingent right to receive one share of the Issuer's Common Stock.

2. Includes 362,694 Restricted Stock Units ("RSUs") and PSUs which are subject to vesting.

3. The sale of shares is for the sole purpose of covering the Reporting Person's tax liability with respect to the settlement of PSUs.

4. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.735 to $0.7616 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

5. The option vests as to 1/2 of the total grant on September 30, 2024, with the remainder of grant vesting on September 30, 2025, subject to the continued service of the Reporting Person on each vesting date.

Remarks:

EVP, Head of Research and Development

	/s/ Vassiliki Economides, Attorney-in-Fact for Karin Jooss	05/17/2024
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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Jooss Karin sold $10,288 worth of shares (13,749 units at $0.75) and was granted 27,128 shares, increasing direct ownership by 2% to 683,526 units (SEC Form 4)