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 *

FLORANCE ANDREW C
2. Issuer Name and Ticker or Trading Symbol

COSTAR GROUP, INC. [ CSGP ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
President and CEO
(Last)          (First)          (Middle)

C/O COSTAR GROUP, INC., 1331 L STREET, NW
3. Date of Earliest Transaction (MM/DD/YYYY)

12/31/2019
(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 12/31/2019  M  1032 A$193.69 97330 (1)D  
Common Stock, par value $0.01 per share 12/31/2019  M  547 A$182.75 97877 (2)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 Security3. Trans. Date3A. Deemed Execution Date, if any4. 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 Date7. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Option to Acquire Common Stock $193.69 12/31/2019  M     1032   (3)3/4/2025 Common Stock 1032.0 $0 31168 D  
Option to Acquire Common Stock $182.75 12/31/2019  M     547   (4)3/10/2026 Common Stock 547.0 $0 36053 D  

Explanation of Responses:
(1) Represents all shares of Common Stock owned, consisting of 25,570 shares of Common Stock and 69,334 shares of Common Stock subject to unvested Restricted Stock grants, 1,213 shares of Deferred Stock Units and 1,213 shares of unvested Restricted Stock Units.
(2) Represents all shares of Common Stock owned, consisting of 26,117 shares of Common Stock and 69,334 shares of Common Stock subject to unvested Restricted Stock grants, 1,213 shares of Deferred Stock Units and 1,213 shares of unvested Restricted Stock Units.
(3) The option vested in three equal installments on March 5, 2016, March 5, 2017 and March 5, 2018.
(4) The option vested in three equal installments on March 11, 2017, March 11, 2018 and March 11, 2019.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
FLORANCE ANDREW C
C/O COSTAR GROUP, INC.
1331 L STREET, NW
WASHINGTON, DC 20005
X
President and CEO

Signatures
/s/ Jonathan Coleman, Attorney-in-Fact1/2/2020
**Signature of Reporting PersonDate

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