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
                                                                                  
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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 * Wheeler Scott T 2. Issuer Name and Ticker or Trading Symbol COSTAR GROUP, INC. [ CSGP ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable)_____ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
Chief Financial Officer
(Last)         (First)         (Middle)
C/O COSTAR GROUP, INC., 1331 L STREET NW		 3. Date of Earliest Transaction (MM/DD/YYYY)
2/28/2021
(Street)
WASHINGTON, DC 20005
(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, par value $0.01 per share  2/28/2021    D    280 (1) D $0  29780 (2) D   
Common Stock, par value $0.01 per share  2/28/2021    F    2372  D $823.76  27408 (3) D   
Common Stock, par value $0.01 per share                 36  I  By Abraham James Wheeler Trust 
Common Stock, par value $0.01 per share                 36  I  By Jacob Paul Wheeler Trust 
Common Stock, par value $0.01 per share                 36  I  By Anna Karin Wheeler Trust 

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

Explanation of Responses:
(1)  Shares forfeited from February 28, 2018 performance restricted stock grant after measurement and certification of actual achievement of the performance goal by the Compensation Committee.
(2)  Represents all shares of Common Stock owned, consisting of 2,467 shares of Common Stock, 23,135 shares of Common Stock subject to unvested Restricted Stock grants, 2,089 shares of Deferred Stock Units and 2,089 shares of unvested Restricted Stock Units.
(3)  Represents all shares of Common Stock owned, consisting of 5,009 shares of Common Stock, 18,221 shares of Common Stock subject to unvested Restricted Stock grants, 2,089 shares of Deferred Stock Units and 2,089 shares of unvested Restricted Stock Units.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Wheeler Scott T
C/O COSTAR GROUP, INC.
1331 L STREET NW
WASHINGTON, DC 20005

Chief Financial Officer

Signatures
/s/ Jeannette Koonce, Attorney-in-Fact 3/2/2021
**Signature of Reporting Person Date