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 *

Parafestas Anastasios 		2. Issuer Name and Ticker or Trading Symbol

CarGurus, Inc. [ CARG ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

ONE JOY STREET 		3. Date of Earliest Transaction (MM/DD/YYYY)

5/17/2018
(Street)

BOSTON, MA 02108
(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
Class A Common Stock                  102080   D    
Class A Common Stock   5/17/2018     S (1)    54625   D $32.26   (2) 13523713   I   See footnote   (3)
Class A Common Stock   5/17/2018     S (1)    11992   D $32.26   (2) 2974909   I   See footnote   (4)
Class A Common Stock   5/18/2018     S (1)    79873   D $32.12   (5) 13443840   I   See footnote   (3)
Class A Common Stock   5/18/2018     S (1)    17534   D $32.12   (5) 2957375   I   See footnote   (4)

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)  This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person.
(2)  The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.64 to $32.74 per share, inclusive. Information regarding the number of shares sold at each separate price will be made available from the Reporting Person upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer.
(3)  The shares are owned directly by Argonaut 22 LLC. Spinnaker Capital LLC is the Managing Member of Argonaut 22 LLC and the Reporting Person, a director of the Issuer, is the Managing Member of Spinnaker Capital LLC. The Reporting Person and Spinnaker Capital LLC are indirect beneficial owners of the reported securities.
(4)  The shares are owned directly by The RWS 2006 Family Trust. The Reporting Person, a director of the Issuer, is a co-trustee of The RWS 2006 Family Trust and may be deemed to be an indirect beneficial owner of the shares held by The RWS 2006 Family Trust. The Reporting Person expressly disclaims beneficial ownership of the shares held by The RWS 2006 Family Trust and this report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.
(5)  The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $31.77 to $33.09 per share, inclusive. Information regarding the number of shares sold at each separate price will be made available from the Reporting Person upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Parafestas Anastasios
ONE JOY STREET
BOSTON, MA 02108 		X X


Signatures
/s/ Anastasios Parafestas 5/21/2018
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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