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 · 3 exercises
InsiderCHUNG JANECIK 1872398
IssuerSUTRO BIOPHARMA, INC.CIK 1382101
Officer· Chief Commercial Officer
Since Aug 2021
+210.95K
Net shares
Net buyer
$83.1K
Total sold
0
Open market trades
0B · 0S
10
Total transactions
225.94K acquired · 14.99K disposed
Non-Derivative Transactions5

Common Stock

Direct
M · Option Exercise

Shares

+688.00

Price / share

Trade value

% of position

5.0%
3/1/2026
13.89K14.58K

Common Stock

Direct
M · Option Exercise

Shares

+2.50K

Price / share

Trade value

% of position

17.1%
3/1/2026
14.58K17.08K

Common Stock

Direct
F · Tax Withholding

Shares

1.27K

Price / share

$20.47

Trade value

$26.02K

% of position

7.4%
3/1/2026
17.08K15.81K

Common Stock

Direct
M · Option Exercise

Shares

+7.75K

Price / share

Trade value

% of position

49.0%
3/2/2026
15.81K23.56K

Common Stock

Direct
F · Tax Withholding

Shares

2.78K

Price / share

$20.55

Trade value

$57.11K

% of position

11.8%
3/2/2026
23.56K20.78K
Total

Net shares

+6.89K

Net value

-$83.13K

Derivative Transactions5

Restricted Stock Units (RSUs)

Direct
M · Option Exercise
Converts to

Common Stock

688.00 shares

Shares

688.00

Strike price

Held after

688.00

Exercisable

3/1/2026

Restricted Stock Units (RSUs)

Direct
M · Option Exercise
Converts to

Common Stock

2.50K shares

Shares

2.50K

Strike price

Held after

5K

Exercisable

3/1/2026

Restricted Stock Units (RSUs)

Direct
M · Option Exercise
Converts to

Common Stock

7.75K shares

Shares

7.75K

Strike price

Held after

23.25K

Exercisable

3/2/2026

Restricted Stock Units (RSUs)

Direct
A · Award
Converts to

Common Stock

40K shares

Shares

+40K

Strike price

Held after

40K

Exercisable

3/2/2026

Stock Option (right to buy)

Direct
A · Award
Converts to

Common Stock

175K shares

Shares

+175K

Strike price

20.55

Held after

175K

Exercisable

3/2/2026
CHUNG JANE — Insider Transaction (Form 4) Filed Mar 3, 2026 | Finecho