Gregory K. Chow - 02 Jun 2025 Form 4 Insider Report for SUTRO BIOPHARMA, INC. (STRO)

Role
CFO
Signature
/s/ David Pauling as attorney-in-fact for Gregory K. Chow
Issuer symbol
STRO
Transactions as of
02 Jun 2025
Net transactions value
$0
Form type
4
Filing time
02 Jun 2025, 16:27:52 UTC
Next filing
16 Oct 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Chow Gregory K. CFO C/O SUTRO BIOPHARMA, INC., 111 OYSTER POINT BOULEVARD, SOUTH SAN FRANCISCO /s/ David Pauling as attorney-in-fact for Gregory K. Chow 02 Jun 2025 0001761333

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction STRO Stock Option (right to buy) Award $0 +275,000 $0.000000 275,000 02 Jun 2025 Common Stock 275,000 $0.9000 Direct F1
transaction STRO Restricted Stock Unit (RSU) Award $0 +100,000 $0.000000 100,000 02 Jun 2025 Common Stock 100,000 Direct F2, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 25% of the option award vests on June 2, 2026. The remainder vests ratably as to 1/48th of the total award monthly thereafter, subject to the reporting person's continued service to the Issuer on each vesting date.
F2 Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement.
F3 The RSU award vests annually as to 1/4th of the total award beginning on June 2, 2026, subject to the reporting person's continued service to the Issuer on each vesting date.