DUBOW ADAM

PrivateCIK: 1744507
Location

BRISBANE, CA

DUBOW ADAM (Gen Counsel & Secretary) reported 1 transaction at DAY ONE BIOPHARMACEUTICALS, INC.

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

InsiderDUBOW ADAMCIK 1744507
Officer· Gen Counsel & Secretary
Since Feb 2026
-902.84K
Net shares
Net seller
$0.00
Total acquired
0
Open market trades
0B · 0S
11
Total transactions
902.84K disposed
Non-Derivative Transactions1

Common Stock

Direct
D · Disposition

Shares

72.69K

Price / share

Trade value

% of position

New position
4/23/2026
72.69K0.00
Total

Net shares

72.69K

Net value

$0.00

Derivative Transactions10

Stock Option (right to buy Common Stock)

Direct
D · Disposition
Converts to

Common Stock

309K shares

Shares

309K

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

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

105K shares

Shares

105K

Strike price

11.16

Held after

0.00

Exercisable

4/23/2026

Restricted Stock Unit (RSU)

Direct
D · Disposition
Converts to

Common Stock

8.89K shares

Shares

8.89K

Strike price

Held after

0.00

Exercisable

4/23/2026

Restricted Stock Unit (RSU)

Direct
D · Disposition
Converts to

Common Stock

5.25K shares

Shares

5.25K

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

65.63K shares

Shares

65.63K

Strike price

Held after

0.00

Exercisable

4/23/2026
DUBOW ADAM — Insider Transaction (Form 4) Filed Apr 23, 2026 | Finecho