- Amended Statement of Ownership (SC 13G/A)

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. 2)*

TechTarget, Inc.

(Name of Issuer)

Common Stock, $0.001 par value

(Title of Class of Securities)

87874R100

(CUSIP Number)

December 31, 2010

(Date of Event Which Requires Filing of this Statement)

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

o Rule 13d-1(b)

o Rule 13d-1(c)

x 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)

Page 1 of 18

CUSIP No: 87874R100

Page 2 of 18

1	NAME OF REPORTING PERSON SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Polaris Venture Partners III, L.P. (“PVP III”)
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) o (b) x
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 200,440 shares, except that (i) Polaris Venture Management Co. III, L.L.C. (“PVM III”), the general partner of PVP III, may be deemed to have sole power to vote these shares, and (ii) Jonathan A. Flint (“Flint”), a managing member of PVM III, may be deemed to have shared power to vote these shares, Terrance G. McGuire (“McGuire”), a managing member of PVM III, may be deemed to have shared power to vote these shares, and Alan G. Spoon (“Spoon”), a managing member of PVM III, may be deemed to have shared power to vote these shares.
		6	SHARED VOTING POWER See response to row 5
		7	SOLE DISPOSITIVE POWER 200,440 shares, except that (i) PVM III, the general partner of PVP III, may be deemed to have sole power to dispose of these shares, and (ii) Flint, a managing member of PVM III, may be deemed to have shared power to dispose of these shares, McGuire, a managing member of PVM III, may be deemed to have shared power to dispose of these shares, and Spoon, a managing member of PVM III, may be deemed to have shared power to dispose of these shares.
		8	SHARED DISPOSITIVE POWER See response to row 7
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 200,440
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.47 %
12	TYPE OF REPORTING PERSON* PN

CUSIP No: 87874R100

Page 3 of 18

1	NAME OF REPORTING PERSON SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Polaris Venture Partners Entrepreneurs’ Fund III, L.P. (“PVP Entrepreneurs III”)
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) o (b) x
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 51,941 shares, except that (i) PVM III, the general partner of PVP Entrepreneurs III, may be deemed to have sole power to vote these shares, and (ii) Flint, a managing member of PVM III, may be deemed to have shared power to vote these shares, McGuire, a managing member of PVM III, may be deemed to have shared power to vote these shares, and Spoon, a managing member of PVM III, may be deemed to have shared power to vote these shares.
		6	SHARED VOTING POWER See response to row 5
		7	SOLE DISPOSITIVE POWER 51,941 shares, except that (i) PVM III, the general partner of PVP Entrepreneurs III, may be deemed to have sole power to dispose of these shares, and (ii) Flint, a managing member of PVM III, may be deemed to have shared power to dispose of these shares, McGuire, a managing member of PVM III, may be deemed to have shared power to dispose of these shares, and Spoon, a managing member of PVM III, may be deemed to have shared power to dispose of these shares.
		8	SHARED DISPOSITIVE POWER See response to row 7
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 51,941
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0. 12 %
12	TYPE OF REPORTING PERSON* PN

CUSIP No: 87874R100

Page 4 of 18

1	NAME OF REPORTING PERSON SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Polaris Venture Partners Founders’ Fund III, LP (“PVP Founders III”)
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) o (b) x
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 31,629 shares , except that (i) PVM III, the general partner of PVP Founders III, may be deemed to have sole power to vote these shares, and (ii) Flint, a managing member of PVM III, may be deemed to have shared power to vote these shares, McGuire, a managing member of PVM III, may be deemed to have shared power to vote these shares, and Spoon, a managing member of PVM III, may be deemed to have shared power to vote these shares.
		6	SHARED VOTING POWER See response to row 5
		7	SOLE DISPOSITIVE POWER 31 ,629 shares, except that (i) PVM III, the general partner of PVP Founders III, may be deemed to have sole power to dispose of these shares, and (ii) Flint, a managing member of PVM III, may be deemed to have shared power to dispose of these shares, McGuire, a managing member of PVM III, may be deemed to have shared power to dispose of these shares, and Spoon, a managing member of PVM III, may be deemed to have shared power to dispose of these shares.
		8	SHARED DISPOSITIVE POWER See response to row 7
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 31 ,629
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.07 %
12	TYPE OF REPORTING PERSON* PN

CUSIP No: 87874R100

Page 5 of 18

1	NAME OF REPORTING PERSON SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Polaris Venture Management Co. III, L.L.C. (“PVM III”)
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) o (b) x
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 284 ,010 shares , of which 2 00,440 shares are directly owned by PVP III, 51,941 shares are directly owned by PVP Entrepreneurs III, and 31,629 shares are directly owned by PVP Founders III, except that Flint, a managing member of PVM III (which is general partner of PVP III, PVP Entrepreneurs III, and PVP Founders III and may be deemed to have sole power to vote these shares), may be deemed to have shared power to vote these shares, McGuire, a managing member of PVM III, may be deemed to have shared power to vote these shares, and Spoon, a managing member of PVM III, may be deemed to have shared power to vote these shares.
		6	SHARED VOTING POWER See response to row 5
		7	SOLE DISPOSITIVE POWER 284 ,010 shares , of which 2 00,440 shares are directly owned by PVP III, 51,941 shares are directly owned by PVP Entrepreneurs III, and 31,629 shares are directly owned by PVP Founders III, except that Flint, a managing member of PVM III (which is general partner of PVP III, PVP Entrepreneurs III, and PVP Founders III and may be deemed to have sole power to vote these shares), may be deemed to have shared power to dispose of these shares, McGuire, a managing member of PVM III, may be deemed to have shared power to dispose of these shares, and Spoon, a managing member of PVM III, may be deemed to have shared power to dispose of these shares.
		8	SHARED DISPOSITIVE POWER See response to row 7
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 284 ,010
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0 .67 %
12	TYPE OF REPORTING PERSON* OO

CUSIP No: 87874R100

Page 6 of 18

1	NAME OF REPORTING PERSON SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Polaris Venture Partners IV, L.P. (“PVP IV”)
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) o (b) x
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 3, 014,764 shares , except that (i) Polaris Venture Management Co. IV, L.L.C. (“PVM IV”), the general partner of PVP IV, may be deemed to have sole power to vote these shares, and (ii) Flint, a managing member of PVM IV, may be deemed to have shared power to vote these shares, McGuire, a managing member of PVM IV, may be deemed to have shared power to vote these shares, and Spoon, a managing member of PVM IV, may be deemed to have shared power to vote these shares.
		6	SHARED VOTING POWER See response to row 5
		7	SOLE DISPOSITIVE POWER 3, 014,764 shares , except that (i) PVM IV, the general partner of PVP IV, may be deemed to have sole power to dispose of these shares, and (ii) Flint, a managing member of PVM IV, may be deemed to have shared power to dispose of these shares, McGuire, a managing member of PVM IV, may be deemed to have shared power to dispose of these shares, and Spoon, a managing member of PVM IV, may be deemed to have shared power to dispose of these shares.
		8	SHARED DISPOSITIVE POWER See response to row 7
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3, 014,764
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.07%
12	TYPE OF REPORTING PERSON* PN

CUSIP No: 87874R100

Page 7 of 18

1	NAME OF REPORTING PERSON SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Polaris Venture Partners Entrepreneurs’ Fund IV, L.P. (“PVP Entrepreneurs IV”)
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) o (b) x
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 54,561 shares , except that (i) PVM IV, the general partner of PVP Entrepreneurs IV, may be deemed to have sole power to vote these shares, and (ii) Flint, a managing member of PVM IV, may be deemed to have shared power to vote these shares, McGuire, a managing member of PVM IV, may be deemed to have shared power to vote these shares, and Spoon, a managing member of PVM IV, may be deemed to have shared power to vote these shares.
		6	SHARED VOTING POWER See response to row 5
		7	SOLE DISPOSITIVE POWER 54,561 shares , except that (i) PVM IV, the general partner of PVP Entrepreneurs IV, may be deemed to have sole power to dispose of these shares, and (ii) Flint, a managing member of PVM IV, may be deemed to have shared power to dispose of these shares, McGuire, a managing member of PVM IV, may be deemed to have shared power to dispose of these shares, and Spoon, a managing member of PVM IV, may be deemed to have shared power to dispose of these shares.
		8	SHARED DISPOSITIVE POWER See response to row 7
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 54,561
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.13%
12	TYPE OF REPORTING PERSON* PN

CUSIP No: 87874R100

Page 8 of 18

1	NAME OF REPORTING PERSON SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Polaris Venture Management Co. IV, L.L.C. (“PVM IV”)
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) o (b) x
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 3,069,325 shares , of which 3, 014,764 shares are directly owned by PVP IV, and 54,561 are directly owned by PVP Entrepreneurs IV, except that Flint, a managing member of PVM IV (which is general partner of PVP IV and PVP Entrepreneurs IV and may be deemed to have sole power to vote these shares), may be deemed to have shared power to vote these shares, McGuire, a managing member of PVM IV, may be deemed to have shared power to vote these shares, and Spoon, a managing member of PVM IV, may be deemed to have shared power to vote these shares.
		6	SHARED VOTING POWER See response to row 5
		7	SOLE DISPOSITIVE POWER 3,069,325 shares , of which 3, 014,764 shares are directly owned by PVP IV, and 54,561 are directly owned by PVP Entrepreneurs IV, except that Flint, a managing member of PVM IV (which is general partner of PVP IV and PVP Entrepreneurs IV and may be deemed to have sole power to vote these shares), may be deemed to have shared power to dispose of these shares, McGuire, a managing member of PVM IV, may be deemed to have shared power to dispose of these shares, and Spoon, a managing member of PVM IV, may be deemed to have shared power to dispose of these shares.
		8	SHARED DISPOSITIVE POWER See response to row 7
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,069,325
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.20%
12	TYPE OF REPORTING PERSON* OO

CUSIP No: 87874R100

Page 9 of 18

1	NAME OF REPORTING PERSON SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Alan G. Spoon
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) o (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 3 , 360,358 shares, of which (i) Spoon owns 7,023 directly (of which 4,523 are shares of common stock and 2,500 are options to purchase shares of common stock), and (ii) 200,440 shares are directly owned by PVP III, 51,941 are directly owned by PVP Entrepreneurs III, 31 ,629 shares are directly owned by PVP Founders III, 3,0 14 , 764 shares are directly owned by PVP IV, and 54,561 shares are directly owned by PVP Entrepreneurs IV, except that, PVM III, as the general partner of PVP III, PVP Entrepreneurs III and PVP Founders III, may be deemed to have sole power to vote PVP III’s shares, PVP Entrepreneurs III’s shares, and PVP Founders III’s shares (collectively, the “Fund III Shares”), and PVM IV, as general partner of PVP IV and PVP Entrepreneurs IV, may be deemed to have sole power to vote the PVP IV shares and PVP Entrepreneurs IV shares (collectively the “Fund IV Shares”), Flint, as a managing member of PVM III and PVM IV, may be deemed to have shared power to vote the Fund III Shares and the Fund IV Shares, and McGuire, as a managing member of PVM III and PVM IV, may be deemed to have shared power to vote the Fund III Shares and the Fund IV Shares.
		6	SHARED VOTING POWER See response to row 5
		7	SOLE DISPOSITIVE POWER 3 ,360,358 shares, of which (i) Spoon owns 7,023 directly (of which 4,523 are shares of common stock and 2,500 are options to purchase shares of common stock), and (ii) 200,440 shares are directly owned by PVP III, 51, 941 are directly owned by PVP Entrepreneurs III, 31 , 629 shares are directly owned by PVP Founders III, 3,014,764 shares are directly owned by PVP IV, and 5 4 , 56 1 shares are directly owned by PVP Entrepreneurs IV, except that, PVM III, as the general partner of PVP III, PVP Entrepreneurs III and PVP Founders III, may be deemed to have sole power to dispose of the Fund III Shares, and PVM IV, as general partner of PVP IV and PVP Entrepreneurs IV, may be deemed to have sole power to dispose of Fund IV Shares, Flint, as a managing member of PVM III and PVM IV, may be deemed to have shared power to dispose of the Fund III Shares and the Fund IV Shares, and McGuire, as a managing member of PVM III and PVM IV, may be deemed to have shared power to dispose of the Fund III Shares and the Fund IV Shares.
		8	SHARED DISPOSITIVE POWER See response to row 7
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3 , 360,358
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7 .88%
12	TYPE OF REPORTING PERSON* IN

CUSIP No: 87874R100

Page 10 of 18

1	NAME OF REPORTING PERSON SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Terrance G. McGuire
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) o (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 3 , 353,335 shares, of which 200,440 shares are directly owned by PVP III, 51,941 are directly owned by PVP Entrepreneurs III, 31,629 shares are directly owned by PVP Founders III, 3,0 14 , 764 shares are directly owned by PVP IV, and 54,561 shares are directly owned by PVP Entrepreneurs IV, except that, PVM III, as the general partner of PVP III, PVP Entrepreneurs III and PVP Founders III, may be deemed to have sole power to vote the Fund III Shares, and PVM IV, as general partner of PVP IV and PVP Entrepreneurs IV, may be deemed to have sole power to vote the Fund IV Shares, Flint, as a managing member of PVM III and PVM IV, may be deemed to have shared power to vote the Fund III Shares and the Fund IV Shares, and Spoon, as a managing member of PVM III and PVM IV, may be deemed to have shared power to vote the Fund III Shares and the Fund IV Shares.
		6	SHARED VOTING POWER See response to row 5
		7	SOLE DISPOSITIVE POWER 3 ,353,335 shares, of which 200,440 shares are directly owned by PVP III, 51, 941 are directly owned by PVP Entrepreneurs III, 31 , 629 shares are directly owned by PVP Founders III, 3,0 14 , 764 shares are directly owned by PVP IV, and 5 4 , 56 1 shares are directly owned by PVP Entrepreneurs IV, except that, PVM III, as the general partner of PVP III, PVP Entrepreneurs III and PVP Founders III, may be deemed to have sole power to dispose of the Fund III Shares, and PVM IV, as general partner of PVP IV and PVP Entrepreneurs IV, may be deemed to have sole power to dispose of the Fund IV Shares, Flint, as a managing member of PVM III and PVM IV, may be deemed to have shared power to dispose of the Fund III Shares and the Fund IV Shares, and Spoon, as a managing member of PVM III and PVM IV, may be deemed to have shared power to dispose of the Fund III Shares and the Fund IV Shares.
		8	SHARED DISPOSITIVE POWER See response to row 7
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3 , 353 , 335
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.86%
12	TYPE OF REPORTING PERSON* IN

CUSIP No: 87874R100

Page 11 of 18

1	NAME OF REPORTING PERSON SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Jonathan A. Flint
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) o (b) x
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 3 , 353 , 335 shares, of which 200,440 shares are directly owned by PVP III, 51,941 are directly owned by PVP Entrepreneurs III, 31 ,629 shares are directly owned by PVP Founders III, 3,0 14,764 shares are directly owned by PVP IV, and 54,561 shares are directly owned by PVP Entrepreneurs IV, except that, PVM III, as the general partner of PVP III, PVP Entrepreneurs III and PVP Founders III, may be deemed to have sole power to vote the Fund III Shares, and PVM IV, as general partner of PVP IV and PVP Entrepreneurs IV, may be deemed to have sole power to vote the Fund IV Shares, McGuire, as a managing member of PVM III and PVM IV, may be deemed to have shared power to vote the Fund III Shares and the Fund IV Shares, and Spoon, as a managing member of PVM III and PVM IV, may be deemed to have shared power to vote the Fund III Shares and the Fund IV Shares.
		6	SHARED VOTING POWER See response to row 5
		7	SOLE DISPOSITIVE POWER 3 , 353 , 335 shares, of which 200,440 shares are directly owned by PVP III, 51, 941 are directly owned by PVP Entrepreneurs III, 31 , 629 shares are directly owned by PVP Founders III, 3,0 14 , 764 shares are directly owned by PVP IV, and 5 4 , 56 1 shares are directly owned by PVP Entrepreneurs IV, except that, PVM III, as the general partner of PVP III, PVP Entrepreneurs III and PVP Founders III, may be deemed to have sole power to dispose of the Fund III Shares, and PVM IV, as general partner of PVP IV and PVP Entrepreneurs IV, may be deemed to have sole power to dispose of the Fund IV Shares, McGuire, as a managing member of PVM III and PVM IV, may be deemed to have shared power to dispose of the Fund III Shares and the Fund IV Shares, and Spoon, as a managing member of PVM III and PVM IV, may be deemed to have shared power to dispose of the Fund III Shares and the Fund IV Shares.
		8	SHARED DISPOSITIVE POWER See response to row 7
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3 , 353 , 335
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* o
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 7.86%
12	TYPE OF REPORTING PERSON* IN

CUSIP No: 87874R100

Page 12 of 18

ITEM 1(A).

NAME OF ISSUER

TechTarget, Inc.

ITEM 1(B).

ADDRESS OF ISSUER’S PRINCIPAL EXECUTIVE OFFICES

117 Kendrick Street, Suite 800

Needham, MA 02494, United States

ITEM 2(A).

NAME OF PERSONS FILING

PVP III, PVP Entrepreneurs III, PVP Founders III, PVM III, PVP IV, PVP Entrepreneurs IV, PVM IV, Flint, McGuire, and Spoon. The foregoing entities and individuals are collectively referred to as the “Reporting Persons.”

Flint, McGuire and Spoon, are the sole managing members of (i) PVM III (the sole general partner of PVP III, PVP Entrepreneurs III and PVP Founders III), and (ii) PVM IV (the sole general partner of PVP IV and PVP Founders IV). To the extent feasible, PVP Entrepreneurs III and PVP Founders III invest alongside PVP III and PVP Entrepreneurs IV invests alongside PVP IV.

ITEM 2(B).

ADDRESS OF PRINCIPAL OFFICE

The address for each of the Reporting Persons is:

c/o Polaris Venture Partners

1000 Winter Street

Waltham, MA 02451

ITEM 2(C).

CITIZENSHIP

Flint , McGuire and Spoon are United States citizens . PVP III, PVP Entrepreneurs III, PVP Founders III, PVP IV and PVP Entrepreneurs IV are limited partnerships organized under the laws of the State of Delaware. PVM III and PVM IV are limited liability companies organized under the laws of the State of Delaware.

ITEM 2(D).

TITLE OF CLASS OF SECURITIES AND CUSIP NUMBER

Common Stock, $0.001 par value per share

ITEM 2(E).

CUSIP NUMBER

87874R100

ITEM 3.

Not Applicable

CUSIP No: 87874R100

Page 13 of 18

ITEM 4.

OWNERSHIP

The approximate percentages of Common Stock reported as beneficially owned by the Reporting Persons are based upon 42,652,132 shares of Common Stock outstanding as of October 29, 2010, as reported on TechTarget, Inc.’s Form 10-Q for the quarterly period ended September 30, 2010.

The following information with respect to the ownership of the ordinary shares of the issuer by the Reporting Persons filing this Statement is provided as of December 31, 2010:

(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

Not applicable.

ITEM 6.

OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON .

Under certain circumstances set forth in the limited partnership agreements of PVP III, PVP Entrepreneurs III, PVP Founders III, PVP IV, and PVP Entrepreneurs IV, and the limited liability company agreements of PVM III and PVM IV, the general and limited partners or members of each such entity, as applicable, may be deemed to have the right to receive dividends from, or the proceeds from, the sale of shares of the issuer owned by each such entity of which they are a partner or member, as applicable.

ITEM 7.

IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY

Not applicable.

CUSIP No: 87874R100

Page 14 of 18

ITEM 8.

IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP .

Not applicable.

ITEM 9.

NOTICE OF DISSOLUTION OF GROUP .

Not applicable.

ITEM 10.

CERTIFICATION .

Not applicable.

CUSIP No: 87874R100

Page 15 of 18

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 11, 2011

	POLARIS VENTURE PARTNERS III, L.P.

	By:	Polaris Venture Management Co. III, L.L.C.


	By:	*
		Managing Member

	POLARIS VENTURE PARTNERS ENTREPRENEURS’ FUND III, L.P.

	By:	Polaris Venture Management Co. III, L.L.C.


	By:	*
		Managing Member

	POLARIS VENTURE PARTNERS FOUNDERS’ FUND III, L.P.

	By:	Polaris Venture Management Co. III, L.L.C.


	By:	*
		Managing Member

	POLARIS VENTURE MANAGEMENT CO. III, L.L.C.

	By:	*
		Managing Member

	POLARIS VENTURE PARTNERS IV, L.P.

	By:	Polaris Venture Management Co. IV, L.L.C.


	By:	*
		Managing Member

CUSIP No: 87874R100

Page 16 of 18


	POLARIS VENTURE PARTNERS ENTREPRENEURS’ FUND IV, L.P.

	By:	Polaris Venture Management Co. IV, L.L.C.


	By:	*
		Managing Member

	POLARIS VENTURE MANAGEMENT CO. IV, L.L.C.

	By:	*
		Managing Member

	JONATHAN A. FLINT

	By:	*
		Jonathan A. Flint

	TERRANCE G. MCGUIRE

	By:	*
		Terrance G. McGuire

	ALAN G. SPOON

	By:	*
		Alan G. Spoon
*By: /s/ John Gannon
Name: John Gannon
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.]

CUSIP No: 87874R100

Page 17 of 18

EXHIBIT I

Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required on Schedule 13G need be filed with respect to ownership by each of the undersigned of shares of Common Stock of TechTarget, Inc.

This Agreement may be executed in any number of counterparts, each of which shall be deemed an original.

Date: February 11, 2011

	POLARIS VENTURE PARTNERS III, L.P.

	By:	Polaris Venture Management Co. III, L.L.C.


	By:	*
		Managing Member

	POLARIS VENTURE PARTNERS ENTREPRENEURS’ FUND III, L.P.

	By:	Polaris Venture Management Co. III, L.L.C.


	By:	*
		Managing Member

	POLARIS VENTURE PARTNERS FOUNDERS’ FUND III, L.P.

	By:	Polaris Venture Management Co. III, L.L.C.


	By:	*
		Managing Member

	POLARIS VENTURE MANAGEMENT CO. III, L.L.C.

	By:	*
		Managing Member

	POLARIS VENTURE PARTNERS IV, L.P.

	By:	Polaris Venture Management Co. IV, L.L.C.


	By:	*
		Managing Member

CUSIP No: 87874R100

Page 18 of 18

	POLARIS VENTURE PARTNERS ENTREPRENEURS’ FUND IV, L.P.

	By:	Polaris Venture Management Co. IV, L.L.C.


	By:	*
		Managing Member

	POLARIS VENTURE MANAGEMENT CO. IV, L.L.C.

	By:	*
		Managing Member

	JONATHAN A. FLINT

	By:	*
		Jonathan A. Flint

	TERRANCE G. MCGUIRE

	By:	*
		Terrance G. McGuire

	ALAN G. SPOON

	By:	*
		Alan G. Spoon
*By: /s/ John Gannon
Name: John Gannon
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.]