FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response...
0.5
                      
Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      
1. Name and Address of Reporting Person * GILL DAVID N 2. Issuer Name and Ticker or Trading Symbol Y-mAbs Therapeutics, Inc. [ YMAB ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)__X__ Director                    _____ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)         (First)         (Middle)
C/O Y-MABS THERAPEUTICS, INC., 230 PARK AVENUE SUITE 3350
3. Date of Earliest Transaction (MM/DD/YYYY)
11/3/2020
(Street)
NEW YORK, NY 10169
(City)       (State)       (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)
 
6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock (1) 11/3/2020    M    4000  A $11.16  4000  D   
Common Stock (1) 11/3/2020    S    4000  D $45.00  0  D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Employee Stock Option (right to buy) (2) $11.16  11/3/2020    M        4000    (3) 4/24/2028  Common stock  4000  $0  28000  D   

Explanation of Responses:
(1)  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.
(2)  Stock option granted to the Reporting Person as a non-employee director pursuant to the 2015 Equity Incentive Plan of Y-mAbs Therapeutics, Inc.
(3)  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.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
GILL DAVID N
C/O Y-MABS THERAPEUTICS, INC.
230 PARK AVENUE SUITE 3350
NEW YORK, NY 10169
X



Signatures
/s/ David N Gill 11/5/2020
**Signature of Reporting Person Date
Y mAbs Therapeutics (NASDAQ:YMAB)
Historical Stock Chart
From Dec 2020 to Jan 2021 Click Here for more Y mAbs Therapeutics Charts.
Y mAbs Therapeutics (NASDAQ:YMAB)
Historical Stock Chart
From Jan 2020 to Jan 2021 Click Here for more Y mAbs Therapeutics Charts.