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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1722964	Y-Mabs Therapeutics Inc.	YMAB	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1106519	N David Gill	C/O Y-Mabs Therapeutics, Inc. 230 Park Avenue Suite 3350 New York NY 10169		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2021-01-19	2,000	$11.16	2,000	No	4	M	Direct
Common Stock	Disposition	2021-01-19	2,000	$46.52	0	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-Employee Stock Option (right to buy)	Disposition	2021-01-19	2,000	$0.00	2,000	$11.16

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
24,000		2028-04-24	No	4	M	Direct

Footnotes

The option exercise and sale transaction reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan previously adopted by the Reporting Person.
This transaction was executed in multiple trades at prices ranging from $45.9500 to $47.6800. The price reported reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was effected.
Stock option granted to the Reporting Person as a non-employee director pursuant to the 2015 Equity Incentive Plan of Y-mAbs Therapeutics, Inc.
The stock option was (a) granted on April 24, 2018 pursuant to the 2015 Equity Incentive Plan of Y-mAbs Therapeutics, Inc., and (b) represents the right to purchase a total of 32,000 shares of common stock; and (c) vests and becomes exercisable in equal monthly installments until the third anniversary of the date of grant subject to continued service through such dates and unless vesting is accelerated pursuant to the terms of the grant.