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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1722964	Y-Mabs Therapeutics Inc.	YMAB	Pharmaceutical Preparations (2834)	474619612

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1753222	Juan Claus Pedro Moller-San	C/O Y-Mabs Therapeutics, Inc. 230 Park Avenue, Suite 3350 New York NY 10169	Chief Executive Officer	Yes	Yes	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	Disposition	2020-12-02	40,734	$51.27	616,569	No	4	S	Indirect	By CM Holding 2015 ApS
Common Stock	Disposition	2020-12-03	9,266	$50.98	607,303	No	4	S	Indirect	By CM Holding 2015 ApS

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By CM Holding 2015 ApS
No	4	S	Indirect	By CM Holding 2015 ApS

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	1,900	Indirect	By minor child
Common Stock	15,625	Direct

Footnotes

This transaction was executed in multiple trades at prices ranging from $51.00 to $51.975. 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.
CM Holding 2015 ApS is Reporting Person's personal holding company of which Reporting Person is the sole owner and as such Reporting Person has sole voting and dispositive power with respect to such shares.
This transaction was executed in multiple trades at prices ranging from $50.81 to $51.16. 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.
Reporting Person may be deemed to have a pecuniary interest in the securities due to family relationship.
Reporting Person disclaims beneficial ownership of the securities reported and this report shall not be deemed an admission that Reporting Person is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.