SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Schedule 13G

(Rule 13d-102)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED

PURSUANT TO RULES 13d-1 (b), (c) AND (d) AND AMENDMENTS THERETO FILED

PURSUANT TO 13d-2 (b)

(Amendment No. 1)

Cardlytics, Inc.

(Name of Issuer)

Common Stock, par value $0.0001 per share

(Title of Class of Securities)

14161W105

(CUSIP Number)

December 31, 2019

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☐ Rule 13d-1(b)

☐ Rule 13d-1(c)

☒ Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

(Continued on following pages)

CUSIP #14161W105

1	NAME OF REPORTING PERSONS   Polaris Venture Partners V, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP   (a)  ☐        (b)  ☒
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION   Delaware

NUMBER OF SHARES   BENEFICIALLY   OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER   0
	6	SHARED VOTING POWER   0
	7	SOLE DISPOSITIVE POWER   0
	8	SHARED DISPOSITIVE POWER   0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON   0
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES   ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9   0.0%
12	TYPE OF REPORTING PERSON   PN

CUSIP #14161W105

1	NAME OF REPORTING PERSONS   Polaris Venture Partners Entrepreneurs’ Fund V, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP   (a)  ☐        (b)  ☒
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION   Delaware

NUMBER OF SHARES   BENEFICIALLY   OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER   0
	6	SHARED VOTING POWER   0
	7	SOLE DISPOSITIVE POWER   0
	8	SHARED DISPOSITIVE POWER   0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON   0
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES   ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9   0.0%
12	TYPE OF REPORTING PERSON   PN

CUSIP #14161W105

1	NAME OF REPORTING PERSONS   Polaris Venture Partners Founders’ Fund V, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP   (a)  ☐        (b)  ☒
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION   Delaware

NUMBER OF SHARES   BENEFICIALLY   OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER   0
	6	SHARED VOTING POWER   0
	7	SOLE DISPOSITIVE POWER   0
	8	SHARED DISPOSITIVE POWER   0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON   0
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES   ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9   0.0%
12	TYPE OF REPORTING PERSON   PN

CUSIP #14161W105

1	NAME OF REPORTING PERSONS   Polaris Venture Partners Special Founders’ Fund V, L.P.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP   (a)  ☐        (b)  ☒
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION   Delaware

NUMBER OF SHARES   BENEFICIALLY   OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER   0
	6	SHARED VOTING POWER   0
	7	SOLE DISPOSITIVE POWER   0
	8	SHARED DISPOSITIVE POWER   0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON   0
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES   ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9   0.0%
12	TYPE OF REPORTING PERSON   PN

CUSIP #14161W105

1	NAME OF REPORTING PERSONS   Polaris Venture Management Co. V, L.L.C.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP   (a)  ☐        (b)  ☒
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION   Delaware

NUMBER OF SHARES   BENEFICIALLY   OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER   0
	6	SHARED VOTING POWER   0
	7	SOLE DISPOSITIVE POWER   0
	8	SHARED DISPOSITIVE POWER   0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON   0
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES   ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9   0.0%
12	TYPE OF REPORTING PERSON   OO

CUSIP #14161W105

1	NAME OF REPORTING PERSONS   Jonathan A. Flint
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP   (a)  ☐        (b)  ☒
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION   United States

NUMBER OF SHARES   BENEFICIALLY   OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER   0
	6	SHARED VOTING POWER   0
	7	SOLE DISPOSITIVE POWER   0
	8	SHARED DISPOSITIVE POWER   0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON   0
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES   ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9   0.0%
12	TYPE OF REPORTING PERSON   IN

CUSIP #14161W105

1	NAME OF REPORTING PERSONS   Terrance G. McGuire
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP   (a)  ☐        (b)  ☒
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION   United States

NUMBER OF SHARES   BENEFICIALLY   OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER   0
	6	SHARED VOTING POWER   0
	7	SOLE DISPOSITIVE POWER   0
	8	SHARED DISPOSITIVE POWER   0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON   0
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES   ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9   0.0%
12	TYPE OF REPORTING PERSON   IN

CUSIP #14161W105

1	NAME OF REPORTING PERSONS   Bryce Youngren
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP   (a)  ☐        (b)  ☒
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION   United States

NUMBER OF SHARES   BENEFICIALLY   OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER   9,010
	6	SHARED VOTING POWER   0
	7	SOLE DISPOSITIVE POWER   9,010
	8	SHARED DISPOSITIVE POWER   0

9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON   9,010
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES   ☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9   0.0% (2)
12	TYPE OF REPORTING PERSON   IN

(1) Based on 25,711,713 shares of Common Stock outstanding as of October 31, 2019, as reported by the Issuer in its Quarterly Report on Form 10-Q for the quarter ended September 30, 2019, filed with the Securities and Exchange Commission on November 12, 2019.

CUSIP #14161W105

This Amendment No. 1 (“Amendment No. 1”) amends and supplements the Schedule 13G initially filed with the United States Securities and Exchange Commission on February 14, 2019 (the “Original Schedule 13G”) by the Reporting Persons. The “Reporting Persons” are collectively, Polaris Venture Partners V, L.P. (“PVP V”), Polaris Venture Partners Entrepreneurs’ Fund V, L.P. (“PVPE V”), Polaris Venture Partners Founders’ Fund V, L.P. (“PVPFF V”), Polaris Venture Partners Special Founders’ Fund V, L.P. (“PVPSFF V”), Polaris Venture Management Co. V, L.L.C. (“PVM V”), Jonathan A. Flint (“Flint”), Terrance G. McGuire (“McGuire”) and Bryce Youngren (“Youngren”), a member of the Issuer’s board of directors. Only those items that are hereby reported are amended; all other items reported in the Original Schedule 13G remain unchanged. Information given in response to each item shall be deemed incorporated by reference in all other items, as applicable. Capitalized terms not defined in this Amendment No. 1 have the meanings ascribed to them in the Original Schedule 13G.

ITEM 4. OWNERSHIP

The approximate percentages of Common Stock reported as beneficially owned by the Reporting Persons are based upon 25,711,713 shares of Common Stock outstanding as of October 31, 2019, as reported on the Issuer’s Quarterly Report on Form 10-Q pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, as filed with the United States Securities and Exchange Commission on November 12, 2019.

The following information with respect to the ownership of the common stock of the Issuer by the Reporting Persons filing this Statement is provided as of January 29, 2020:

(a) Amount beneficially owned:

See Row 9 of cover page for each Reporting Person.

(b) Percent of Class:

See Row 11 of cover page for each Reporting Person.

(c) Number of shares as to which such person has:

(i) Sole power to vote or to direct the vote:

See Row 5 of cover page for each Reporting Person.

(ii) Shared power to vote or to direct the vote:

See Row 6 of cover page for each Reporting Person.

(iii) Sole power to dispose or to direct the disposition of:

See Row 7 of cover page for each Reporting Person.

(iv) Shared power to dispose or to direct the disposition of:

See Row 8 of cover page for each Reporting Person.

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than 5% of the class of securities, check the following: ☒

Material to be Filed as Exhibits.

Exhibit A – Agreement regarding filing of joint Schedule 13G.

Exhibit B – Power of Attorney (Jonathan A. Flint)

Exhibit C – Power of Attorney (Terrance G. McGuire)

Exhibit D – Power of Attorney (Bryce Youngren)

CUSIP #14161W105

SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: February 12, 2020

POLARIS VENTURE PARTNERS V, L.P.
By:	Polaris Venture Management Co. V, L.L.C.
By:	*
	Authorized Signatory
POLARIS VENTURE PARTNERS ENTREPRENEURS’ FUND V, L.P.
By:	Polaris Venture Management Co. V, L.L.C.
By:	*
	Authorized Signatory
POLARIS VENTURE PARTNERS FOUNDERS’ FUND V, L.P.
By:	Polaris Venture Management Co. V, L.L.C.
By:	*
	Authorized Signatory
POLARIS VENTURE PARTNERS SPECIAL FOUNDERS’ FUND V, L.P.
By:	Polaris Venture Management Co. V, L.L.C.
By:	*
	Authorized Signatory
POLARIS VENTURE MANAGEMENT CO. V, L.L.C.
By:	*
	Authorized Signatory

CUSIP #14161W105

JONATHAN A. FLINT
By:	**
	Jonathan A. Flint
TERRANCE G. MCGUIRE
By:	**
	Terrance G. McGuire
BRYCE YOUNGREN
By:	**
	Bryce Youngren

By:	/s/ Lauren Crockett
Name:	Lauren Crockett
	Attorney-in-Fact

[* This Schedule 13G was executed pursuant to a Power of Attorney. Note that copies of the applicable Powers of Attorney are already on file with the appropriate agencies.]

[** This Schedule 13G was executed pursuant to a Power of Attorney. Note that copies of the applicable Powers of Attorney are included as exhibits to this Amendment No. 1.]