GAD THOMAS

PrivateCIK: 1753224
Location

PRINCETON, NJ

GAD THOMAS (President and Chairman) reported 4 transactions at Y-MABS THERAPEUTICS, INC.

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

InsiderGAD THOMASCIK 1753224
IssuerY-MABS THERAPEUTICS, INC.CIK 1722964
DirectorOfficer· President and Chairman
Since Sep 2018
-1.74M
Net shares
Net seller
$3.21M
Total sold
0
Open market trades
0B · 0S
18
Total transactions
1.74M disposed
Non-Derivative Transactions4

Common Stock

Direct
U · U

Shares

245.49K

Price / share

$8.60

Trade value

$2.11M

% of position

New position
9/16/2025
245.49K0.00

Common Stock

Direct
D · Disposition

Shares

60.23K

Price / share

Trade value

% of position

New position
9/16/2025
60.23K0.00

Common Stock

Indirect
U · U

Shares

67.68K

Price / share

$8.60

Trade value

$582.06K

% of position

New position
9/16/2025
67.68K0.00

Common Stock

Indirect
U · U

Shares

60K

Price / share

$8.60

Trade value

$516K

% of position

New position
9/16/2025
60K0.00
Total

Net shares

433.40K

Net value

-$3.21M

Derivative Transactions14

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

143.17K shares

Shares

143.17K

Strike price

4.38

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

16K shares

Shares

16K

Strike price

8.50

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

100K shares

Shares

100K

Strike price

11.16

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

107.50K shares

Shares

107.50K

Strike price

21.97

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

130K shares

Shares

130K

Strike price

30.34

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

91.45K shares

Shares

91.45K

Strike price

53.88

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

110K shares

Shares

110K

Strike price

15.73

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

60K shares

Shares

60K

Strike price

9.52

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

242.20K shares

Shares

242.20K

Strike price

4.70

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

75K shares

Shares

75K

Strike price

5.75

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

132.50K shares

Shares

132.50K

Strike price

9.83

Held after

0.00

Exercisable

9/16/2025

Employee Stock Option (right to buy)

Direct
D · Disposition
Converts to

Common Stock

64K shares

Shares

64K

Strike price

6.16

Held after

0.00

Exercisable

9/16/2025

Restricted Stock Units

Direct
D · Disposition
Converts to

Common Stock

16K shares

Shares

16K

Strike price

Held after

0.00

Exercisable

9/16/2025

Restricted Stock Units

Direct
D · Disposition
Converts to

Common Stock

16K shares

Shares

16K

Strike price

Held after

0.00

Exercisable

9/16/2025
GAD THOMAS — Insider Transaction (Form 4) Filed Sep 18, 2025 | Finecho