Thomas Gad - Dec 21, 2023 Form 4 Insider Report for Y-mAbs Therapeutics, Inc. (YMAB)

Role: Chief Business Officer, Director
Signature: /s/ Thomas Gad
Stock symbol: YMAB
Transactions as of: Dec 21, 2023
Transactions value $: $100,000
Form type: 4
Date filed: 12/26/2023, 04:15 PM
Previous filing: Dec 15, 2023
Next filing: Jan 22, 2024

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	YMAB	Common Stock	Options Exercise	$100K	+50K	+55.25%	$2.00	141K	Dec 21, 2023	Direct	F1, F2
holding	YMAB	Common Stock						265K	Dec 21, 2023	By GAD Enterprises LLC	F3
holding	YMAB	Common Stock						60K	Dec 21, 2023	By Children	F4

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	YMAB	Employee Stock Option (right to buy)	Options Exercise	$0	-50K	-32.68%	$0.00	103K	Dec 21, 2023	Common Stock	50K	$2.00	Direct	F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents shares acquired through the exercise of Employee Stock Options.
F2	Represents 100,000 shares of Common Stock owned by Reporting Person as well as 40,500 restricted stock units ("RSUs") granted to the Reporting Person on January 17, 2023 pursuant to the 2018 Equity Incentive Plan of Y-mAbs Therapeutics, Inc. Each RSU represents a contingent right to receive one share of Common Stock on the vesting dates of the RSU. The RSUs vest by 1/3 on each of January 17, 2024, January 17, 2025 and January 17, 2026 subject to the continuing employment of the Reporting Person on each vesting date.
F3	Reporting Person is sole member of GAD Enterprises, LLC and the sole member and manager of GAD Management, LLC, the manager of GAD Enterprises, LLC, and as such Reporting Person has sole voting and dispositive power with respect to such shares.
F4	Represents shares owned by Reporting Person's children who are deemed to share Reporting Person's household.
F5	The stock option vested and became exercisable as to 25% of the shares subject to the option on June 10, 2016, and thereafter vested as to 1/48th of the shares in equal monthly installments, until such time as the option was 100% vested on June 10, 2019.