CHUNG JANE

PrivateCIK: 1872398
Location

SOUTH SAN FRANCISCO, CA

CHUNG JANE (Chief Commercial Officer) exercised options at SUTRO BIOPHARMA, INC.

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

M · 1 exercise
InsiderCHUNG JANECIK 1872398
IssuerSUTRO BIOPHARMA, INC.CIK 1382101
Officer· Chief Commercial Officer
Since Aug 2021
-282.00
Net shares
Net seller
$6.0K
Total sold
0
Open market trades
0B · 0S
3
Total transactions
788.00 acquired · 1.07K disposed
Non-Derivative Transactions2

Common Stock

Direct
M · Option Exercise

Shares

+788.00

Price / share

Trade value

% of position

3.8%
3/4/2026
20.78K21.57K

Common Stock

Direct
F · Tax Withholding

Shares

282.00

Price / share

$21.31

Trade value

$6.01K

% of position

1.3%
3/4/2026
21.57K21.29K
Total

Net shares

+506.00

Net value

-$6.01K

Derivative Transactions1

Restricted Stock Units (RSUs)

Direct
M · Option Exercise
Converts to

Common Stock

788.00 shares

Shares

788.00

Strike price

Held after

0.00

Exercisable

3/4/2026
CHUNG JANE — Insider Transaction (Form 4) Filed Mar 6, 2026 | Finecho