MERENDINO LAUREN

PrivateCIK: 1855298
Location

BRISBANE, CA

MERENDINO LAUREN (Chief Commercial Officer) reported 1 transaction at DAY ONE BIOPHARMACEUTICALS, INC.

Review the transaction codes below to understand the nature of each event.

InsiderMERENDINO LAURENCIK 1855298
Officer· Chief Commercial Officer
Since Feb 2026
-835.09K
Net shares
Net seller
$0.00
Total acquired
0
Open market trades
0B · 0S
9
Total transactions
835.09K disposed
Non-Derivative Transactions1

Common Stock

Direct
D · Disposition

Shares

60.16K

Price / share

Trade value

% of position

New position
4/23/2026
60.16K0.00
Total

Net shares

60.16K

Net value

$0.00

Derivative Transactions8

Stock Option (right to buy Common Stock)

Direct
D · Disposition
Converts to

Common Stock

330.20K shares

Shares

330.20K

Strike price

8.99

Held after

0.00

Exercisable

4/23/2026

Stock Option (right to buy Common Stock)

Direct
D · Disposition
Converts to

Common Stock

90K shares

Shares

90K

Strike price

8.99

Held after

0.00

Exercisable

4/23/2026

Stock Option (right to buy Common Stock)

Direct
D · Disposition
Converts to

Common Stock

90K shares

Shares

90K

Strike price

8.99

Held after

0.00

Exercisable

4/23/2026

Stock Option (right to buy Common Stock)

Direct
D · Disposition
Converts to

Common Stock

110K shares

Shares

110K

Strike price

11.16

Held after

0.00

Exercisable

4/23/2026

Restricted Stock Unit (RSU)

Direct
D · Disposition
Converts to

Common Stock

18.98K shares

Shares

18.98K

Strike price

Held after

0.00

Exercisable

4/23/2026

Restricted Stock Unit (RSU)

Direct
D · Disposition
Converts to

Common Stock

25.82K shares

Shares

25.82K

Strike price

Held after

0.00

Exercisable

4/23/2026

Restricted Stock Unit (RSU)

Direct
D · Disposition
Converts to

Common Stock

40.56K shares

Shares

40.56K

Strike price

Held after

0.00

Exercisable

4/23/2026

Restricted Stock Unit (RSU)

Direct
D · Disposition
Converts to

Common Stock

69.38K shares

Shares

69.38K

Strike price

Held after

0.00

Exercisable

4/23/2026
MERENDINO LAUREN — Insider Transaction (Form 4) Filed Apr 23, 2026 | Finecho