GERBER HANS-PETER (CHIEF SCIENTIFIC OFFICER) exercised options at SUTRO BIOPHARMA, INC.

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 2 exercises

GERBER HANS-PETER

Filed: 3/3/2026ACC: 0001992979-26-000002

InsiderGERBER HANS-PETERCIK 1992979

→

IssuerSUTRO BIOPHARMA, INC.CIK 1382101

Officer· CHIEF SCIENTIFIC OFFICER

Since Mar 2026

+43.37K

Net shares

Net buyer

$33.5K

Total sold

Open market trades

0B · 0S

Total transactions

48.97K acquired · 5.60K disposed

Non-Derivative Transactions4

Common Stock

Direct

M · Option Exercise

+1.13K

Price / share

—

Trade value

—

% of position

15.7%

3/1/2026

7.18K→8.31K

Common Stock

Direct

F · Tax Withholding

−463.00

Price / share

$20.47

Trade value

$9.48K

% of position

5.6%

3/1/2026

8.31K→7.84K

Common Stock

Direct

M · Option Exercise

+2.84K

Price / share

—

Trade value

—

% of position

36.2%

3/2/2026

7.84K→10.69K

Common Stock

Direct

F · Tax Withholding

−1.17K

Price / share

$20.55

Trade value

$24.04K

% of position

10.9%

3/2/2026

10.69K→9.52K

Total

Net shares

+2.33K

Net value

-$33.52K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/1/2026	M · Option Exercise	+1.13K	—	—	15.7%	7.18K	8.31K
Common Stock Direct	3/1/2026	F · Tax Withholding	−463.00	$20.47	$9.48K	5.6%	8.31K	7.84K
Common Stock Direct	3/2/2026	M · Option Exercise	+2.84K	—	—	36.2%	7.84K	10.69K
Common Stock Direct	3/2/2026	F · Tax Withholding	−1.17K	$20.55	$24.04K	10.9%	10.69K	9.52K
Total			+2.33K		-$33.52K

Derivative Transactions4

Restricted Stock Units (RSUs)

Direct

M · Option Exercise

Converts to

Common Stock

1.13K shares

−1.13K

Strike price

Held after

2.25K

Exercisable

—

3/1/2026

Restricted Stock Units (RSUs)

Direct

M · Option Exercise

Converts to

Common Stock

2.84K shares

−2.84K

Strike price

Held after

8.53K

Exercisable

—

3/2/2026

Restricted Stock Units (RSUs)

Direct

A · Award

Converts to

Common Stock

5K shares

+5K

Strike price

Held after

Exercisable

—

3/2/2026

Stock Option (right to buy)

Direct

A · Award

Converts to

Common Stock

40K shares

+40K

Strike price

20.55

Held after

40K

Exercisable

—

3/2/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units (RSUs) Direct	Common Stock1.13K shares	3/1/2026	M · Option Exercise	−1.13K		—	2.25K
Restricted Stock Units (RSUs) Direct	Common Stock2.84K shares	3/2/2026	M · Option Exercise	−2.84K		—	8.53K
Restricted Stock Units (RSUs) Direct	Common Stock5K shares	3/2/2026	A · Award	+5K		—	5K
Stock Option (right to buy) Direct	Common Stock40K shares	3/2/2026	A · Award	+40K	20.55	—	40K