Pauling David 4

4 · SUTRO BIOPHARMA, INC. · Filed Mar 3, 2026

Form 4

Period: 2026-03-01

Chief Admin. Ofcr. & GC

Transactions

Exercise/Conversion
Common Stock
2026-03-01+500→ 7,673 total
Exercise/Conversion
Common Stock
2026-03-01+842→ 8,515 total
Tax Payment
Common Stock
[F1]
2026-03-01$20.47/sh−551$11,279→ 7,964 total
Exercise/Conversion
Common Stock
2026-03-02+2,356→ 10,320 total
Tax Payment
Common Stock
[F1]
2026-03-02$20.55/sh−970$19,934→ 9,350 total
Exercise/Conversion
Restricted Stock Units (RSUs)
[F2][F3]
2026-03-01−500→ 500 total
Exp: 2027-03-01→ Common Stock (500 underlying)
Exercise/Conversion
Restricted Stock Units (RSUs)
[F2][F4]
2026-03-01−842→ 1,686 total
Exp: 2028-03-01→ Common Stock (842 underlying)
Exercise/Conversion
Restricted Stock Units (RSUs)
[F2][F5]
2026-03-02−2,356→ 7,069 total
Exp: 2029-03-02→ Common Stock (2,356 underlying)
Award
Restricted Stock Units (RSUs)
[F2][F6]
2026-03-02+4,200→ 4,200 total
Exp: 2030-03-01→ Common Stock (4,200 underlying)
Award
Stock Option (right to buy)
[F7]
2026-03-02+33,600→ 33,600 total
Exercise: $20.55Exp: 2036-03-02→ Common Stock (33,600 underlying)

Footnotes (7)

[F1]Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding and remittance obligations in connection with the net settlement of RSUs; does not represent a sale by the reporting person.
[F2]Each RSU represents a contingent right to receive one (1) share of the Issuer's Common Stock upon settlement.
[F3]The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 1, 2024, subject to continued service through each vesting date.
[F4]The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 1, 2025, subject to continued service through each vesting date.
[F5]The RSUs vested or vest as to 1/4 of the total award annually, with the first tranche vested on March 2, 2026, subject to continued service through each vesting date.
[F6]The RSUs shall vest as to 1/4 of the total award annually, with the first tranche vesting on March 1, 2027, subject to continued service through each vesting date.
[F7]1/48 of the total option award shall vest monthly, subject to the reporting person's continued service to the Issuer on each vesting date, with the first tranche vesting on April 1, 2026.

Signature

/s/ David Pauling|2026-03-03

Documents

1 file