NEWELL WILLIAM J (CEO & President) exercised options at SUTRO BIOPHARMA, INC.

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

M · 2 exercises

NEWELL WILLIAM J

Filed: 3/7/2023ACC: 0001209191-23-016809

InsiderNEWELL WILLIAM JCIK 1309660

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IssuerSUTRO BIOPHARMA, INC.CIK 1382101

DirectorOfficer· CEO & President

Since Sep 2018

+202.75K

Net shares

Net buyer

$99.9K

Total sold

Open market trades

0B · 0S

Total transactions

269.88K acquired · 67.12K disposed

Non-Derivative Transactions3

Common Stock

Direct

M · Option Exercise

+31.13K

Price / share

—

Trade value

—

% of position

23.5%

3/3/2023

132.19K→163.31K

Common Stock

Direct

M · Option Exercise

+18.75K

Price / share

—

Trade value

—

% of position

11.5%

3/3/2023

163.31K→182.06K

Common Stock

Direct

F · Tax Withholding

−17.25K

Price / share

$5.79

Trade value

$99.85K

% of position

9.5%

3/3/2023

182.06K→164.82K

Total

Net shares

+32.63K

Net value

-$99.85K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/3/2023	M · Option Exercise	+31.13K	—	—	23.5%	132.19K	163.31K
Common Stock Direct	3/3/2023	M · Option Exercise	+18.75K	—	—	11.5%	163.31K	182.06K
Common Stock Direct	3/3/2023	F · Tax Withholding	−17.25K	$5.79	$99.85K	9.5%	182.06K	164.82K
Total			+32.63K		-$99.85K

Derivative Transactions4

Stock Option (right to buy Common Stock)

Direct

A · Award

Converts to

Common Stock

125K shares

+125K

Strike price

5.79

Held after

125K

Exercisable

—

3/3/2023

Restricted Stock Unit (RSU)

Direct

A · Award

Converts to

Common Stock

95K shares

+95K

Strike price

Held after

95K

Exercisable

—

3/3/2023

Restricted Stock Unit (RSU)

Direct

M · Option Exercise

Converts to

Common Stock

31.13K shares

−31.13K

Strike price

Held after

93.38K

Exercisable

—

3/3/2023

Restricted Stock Unit (RSU)

Direct

M · Option Exercise

Converts to

Common Stock

18.75K shares

−18.75K

Strike price

Held after

37.50K

Exercisable

—

3/3/2023

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (right to buy Common Stock) Direct	Common Stock125K shares	3/3/2023	A · Award	+125K	5.79	—	125K
Restricted Stock Unit (RSU) Direct	Common Stock95K shares	3/3/2023	A · Award	+95K		—	95K
Restricted Stock Unit (RSU) Direct	Common Stock31.13K shares	3/3/2023	M · Option Exercise	−31.13K		—	93.38K
Restricted Stock Unit (RSU) Direct	Common Stock18.75K shares	3/3/2023	M · Option Exercise	−18.75K		—	37.50K

Non-Derivative Holdings (Post-Transaction)1

Common Stock

Indirect

Shares owned116.53K

Total

116.53K indirect116.53K

Security Title	Shares Owned	Ownership Type
Common Stock	116.53K	Indirect
Total	116.53K	116.53K indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported