Sec Form 4 Filing - Steinert Langley @ CarGurus, Inc. - 2017-10-16

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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Steinert Langley 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 X __ Officer (give title below) _____ Other (specify below) CEO, President and Chairman (Last) (First) (Middle) 2 CANAL PARK, 4TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 10/16/2017 (Street) CAMBRIDGE, MA02141 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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 10/16/2017 C 3,317,659 A 12,429,285 D Class A Common Stock 10/16/2017 S 3,378,084 D $ 14.88 9,051,201 D Class A Common Stock 10/16/2017 S 3,110 D $ 14.88 7,258 I See Footnote ( 2 ) Class A Common Stock 10/16/2017 S 3,110 D $ 14.88 7,258 I See Footnote ( 3 ) Class A Common Stock 10/16/2017 S 3,110 D $ 14.88 7,258 I See Footnote ( 4 ) Class A Common Stock 10/16/2017 S 3,110 D $ 14.88 7,258 I See Footnote ( 5 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 Series A Convertible Preferred Stock ( 1 ) 10/16/2017 C 380,914 ( 1 ) ( 1 ) Class A Common Stock 2,285,485 $ 0 0 D Series B Convertible Preferred Stock ( 1 ) 10/16/2017 C 128,058 ( 1 ) ( 1 ) Class A Common Stock 768,348 $ 0 0 D Series C Convertible Preferred Stock ( 1 ) 10/16/2017 C 43,971 ( 1 ) ( 1 ) Class A Common Stock 263,826 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Steinert Langley 2 CANAL PARK, 4TH FLOOR CAMBRIDGE, MA02141 X X CEO, President and Chairman Signatures /s/ Kathleen Patton, as attorney-in-fact 10/18/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Each share of the Issuer's Series A Convertible Preferred Stock converted into 6.0000023 shares of the Issuer's Class A Common Stock upon the closing of the Issuer's sale of its Class A Common Stock in its firm commitment underwritten initial public offering pursuant to a registration statement on Form S-1 (File No. 333-220495) under the Securities Act of 1933, as amended (the "IPO"), and had no expiration date. Each share of the Issuer's Series B Convertible Preferred Stock converted into 6.0000015 shares of the Issuer's Class A Common Stock upon closing of the IPO and had no expiration date. Each share of the Issuer's Series C Convertible Preferred Stock converted into 6 shares of the Issuer's Class A Common Stock upon closing of the IPO and had no expiration date. ( 2 )These shares are owned directly by an irrevocable family trust, of which Langley Steinert's mother is the beneficiary. Langley Steinert may be deemed to have indirect ownership over such shares, but expressly disclaims beneficial ownership of such shares. ( 3 )These shares are owned directly by an irrevocable family trust, of which Langley Steinert's brother is the beneficiary. Langley Steinert may be deemed to have indirect ownership over such shares, but expressly disclaims beneficial ownership of such shares. ( 4 )These shares are owned directly by an irrevocable family trust, of which Langley Steinert's mother-in-law is the beneficiary. Langley Steinert may be deemed to have indirect ownership over such shares, but expressly disclaims beneficial ownership of such shares. ( 5 )These shares are owned directly by an irrevocable family trust, of which Langley Steinert's brother is the beneficiary. Langley Steinert may be deemed to have indirect ownership over such shares, but expressly disclaims beneficial ownership of such shares.

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).

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