UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

(Amendment No. 8)1

Tessera Technologies, Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

88164L100

(CUSIP Number)

JEFFREY C. SMITH

STARBOARD VALUE LP

777 Third Avenue, 18th Floor

New York, New York 10017

(212) 845-7977

STEVE WOLOSKY, ESQ.

OLSHAN FROME WOLOSKY LLP

Park Avenue Tower

65 East 55th Street

New York, New York 10022

(212) 451-2300

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

February 20, 2015

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ¨.

Note:  Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See § 240.13d-7 for other parties to whom copies are to be sent.

_______________

1              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).

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON STARBOARD VALUE LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 3,175,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 3,175,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,175,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.0%
14	TYPE OF REPORTING PERSON PN

2

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION CAYMAN ISLANDS
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 1,921,392
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 1,921,392
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,921,392
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 3.6%
14	TYPE OF REPORTING PERSON CO

3

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY S LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 435,019
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 435,019
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 435,019
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON OO

4

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON STARBOARD VALUE AND OPPORTUNITY C LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 136,342
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 136,342
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 136,342
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON PN

5

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON STARBOARD VALUE R LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 136,342
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 136,342
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 136,342
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON PN

6

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON STARBOARD VALUE R GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 136,342
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 136,342
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 136,342
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON OO

7

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON STARBOARD VALUE GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 3,175,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 3,175,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,175,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.0%
14	TYPE OF REPORTING PERSON OO

8

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON STARBOARD PRINCIPAL CO LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 3,175,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 3,175,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,175,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.0%
14	TYPE OF REPORTING PERSON PN

9

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON STARBOARD PRINCIPAL CO GP LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 3,175,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 3,175,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,175,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.0%
14	TYPE OF REPORTING PERSON OO

10

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON JEFFREY C. SMITH
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 3,175,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 3,175,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,175,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.0%
14	TYPE OF REPORTING PERSON IN

11

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON MARK R. MITCHELL
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER - 0 -
	8	SHARED VOTING POWER 3,175,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 3,175,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,175,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.0%
14	TYPE OF REPORTING PERSON IN

12

CUSIP NO. 88164L100

1	NAME OF REPORTING PERSON PETER A. FELD
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS OO
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) OR 2(e)		¨
6	CITIZENSHIP OR PLACE OF ORGANIZATION USA
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	7	SOLE VOTING POWER 11,541
	8	SHARED VOTING POWER 3,175,000
	9	SOLE DISPOSITIVE POWER 11,541
	10	SHARED DISPOSITIVE POWER 3,175,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,186,541
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.0%
14	TYPE OF REPORTING PERSON IN

13

CUSIP NO. 88164L100

The following constitutes Amendment No. 8 to the Schedule 13D filed by the undersigned (“Amendment No. 8”).  This Amendment No. 8 amends the Schedule 13D as specifically set forth herein.

Item 3. Source and Amount of Funds or Other Consideration.

Item 3 is hereby amended and restated to read as follows:

The Shares purchased by each of Starboard V&O Fund, Starboard S LLC and Starboard C LP and held in the Starboard Value LP Account were purchased with working capital (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business) in open market purchases, except as otherwise noted, as set forth in Schedule A, which is incorporated by reference herein.  The aggregate purchase price of the 1,921,392 Shares beneficially owned by Starboard V&O Fund is approximately $27,941,053, excluding brokerage commissions.  The aggregate purchase price of the 435,019 Shares beneficially owned by Starboard S LLC is approximately $7,059,387, excluding brokerage commissions. The aggregate purchase price of the 136,342 Shares beneficially owned by Starboard C LP is approximately $2,431,124, excluding brokerage commissions. The aggregate purchase price of the 682,247 Shares held in the Starboard Value LP Account is approximately $11,092,813, excluding brokerage commissions.  The 11,541 Shares directly owned by Mr. Feld were granted to Mr. Feld by the Issuer in his capacity as a director of the Issuer.

Item 5. Interest in Securities of the Issuer.

Items 5(a)-(c) are hereby amended and restated to read as follows:

The aggregate percentage of Shares reported owned by each person named herein is based upon 52,770,296 Shares outstanding, as of October 24, 2014, which is the total number of Shares outstanding as reported in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on November 4, 2014.

A. Starboard V&O Fund

(a) As of the close of business on February 20, 2015, Starboard V&O Fund beneficially owned 1,921,392Shares.

Percentage: Approximately 3.6%

(b) 1. Sole power to vote or direct vote: 1,921,392

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 1,921,392

4. Shared power to dispose or direct the disposition: 0

(c) The transactions in the Shares by Starboard V&O Fund during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

B. Starboard S LLC

(a) As of the close of business on February 20, 2015, Starboard S LLC beneficially owned 435,019Shares.

Percentage: Less than 1%

14

CUSIP NO. 88164L100

(b) 1. Sole power to vote or direct vote: 435,019

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 435,019

4. Shared power to dispose or direct the disposition: 0

(c) The transactions in the Shares by Starboard S LLC during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

C. Starboard C LP

(a) As of the close of business on February 20, 2015, Starboard C LP beneficially owned 136,342 Shares.

Percentage: Less than 1%

(b) 1. Sole power to vote or direct vote: 136,342

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 136,342

4. Shared power to dispose or direct the disposition: 0

(c) The transactions in the Shares by Starboard C LP during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

D. Starboard R LP

(a) Starboard R LP, as the general partner of Starboard C LP, may be deemed the beneficial owner of the 136,342 shares owned by Starboard C LP.

Percentage: Less than 1%

(b) 1. Sole power to vote or direct vote: 136,342

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 136,342

4. Shared power to dispose or direct the disposition: 0

(c) Starboard R LP has not entered into any transactions in the Shares during the past sixty days.  The transactions in the Shares on behalf of Starboard C LP during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

E. Starboard R GP

(a) Starboard R GP, as the general partner of Starboard R LP, may be deemed the beneficial owner of the 136,342 shares owned by Starboard C LP.

Percentage: Less than 1%

(b) 1. Sole power to vote or direct vote: 136,342

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 136,342

4. Shared power to dispose or direct the disposition: 0

(c) Starboard R GP has not entered into any transactions in the Shares during the past sixty days.  The transactions in the Shares on behalf of Starboard C LP during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

15

CUSIP NO. 88164L100

F. Starboard Value LP

(a) As of the close of business on February 20, 2015, 682,247 Shares were held in the Starboard Value LP Account.  Starboard Value LP, as the investment manager of Starboard V&O Fund, Starboard C LP and the Starboard Value Account and the manager of Starboard S LLC, may be deemed the beneficial owner of the (i) 1,921,392Shares owned by Starboard V&O Fund, (ii) 435,019 Shares owned by Starboard S LLC, (iii) 136,342 Shares owned by Starboard C LP and (iv) 682,247 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.0%

(b) 1. Sole power to vote or direct vote: 3,175,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 3,175,000

4. Shared power to dispose or direct the disposition: 0

(c) The transactions in the Shares by Starboard Value LP through the Starboard Value LP Account and on behalf of each of Starboard V&O Fund, Starboard S LLC and Starboard C LP during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

G. Starboard Value GP

(a) Starboard Value GP, as the general partner of Starboard Value LP, may be deemed the beneficial owner of the (i) 1,921,392Shares owned by Starboard V&O Fund, (ii) 435,019 Shares owned by Starboard S LLC, (iii) 136,342 Shares owned by Starboard C LP and (iv) 682,247 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.0%

(b) 1. Sole power to vote or direct vote: 3,175,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 3,175,000

4. Shared power to dispose or direct the disposition: 0

(c) Starboard Value GP has not entered into any transactions in the Shares during the past sixty days.  The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and through the Starboard Value LP Account during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

H. Principal Co

(a) Principal Co, as a member of Starboard Value GP, may be deemed the beneficial owner of the (i) 1,921,392 Shares owned by Starboard V&O Fund, (ii) 435,019 Shares owned by Starboard S LLC, (iii) 136,342 Shares owned by Starboard C LP and (iv) 682,247 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.0%

16

CUSIP NO. 88164L100

(b) 1. Sole power to vote or direct vote: 3,175,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 3,175,000

4. Shared power to dispose or direct the disposition: 0

(c) Principal Co has not entered into any transactions in the Shares during the past sixty days.  The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and through the Starboard Value LP Account during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

I. Principal GP

(a) Principal GP, as the general partner of Principal Co, may be deemed the beneficial owner of the (i) 1,921,392 Shares owned by Starboard V&O Fund, (ii) 435,019 Shares owned by Starboard S LLC, (iii) 136,342 Shares owned by Starboard C LP and (iv) 682,247 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.0%

(b) 1. Sole power to vote or direct vote: 3,175,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 3,175,000

4. Shared power to dispose or direct the disposition: 0

(c) Principal GP has not entered into any transactions in the Shares during the past sixty days. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and through the Starboard Value LP Account during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

J. Messrs. Smith and Mitchell

(a) Each of Messrs. Smith and Mitchell, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP, may be deemed the beneficial owner of the (i) 1,921,392 Shares owned by Starboard V&O Fund, (ii) 435,019 Shares owned by Starboard S LLC, (iii) 136,342 Shares owned by Starboard C LP and (iv) 682,247 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.0%

(b) 1. Sole power to vote or direct vote: 0

2. Shared power to vote or direct vote: 3,175,000

3. Sole power to dispose or direct the disposition: 0

4. Shared power to dispose or direct the disposition: 3,175,000

(c) None of Messrs. Smith or Mitchell has entered into any transactions in the Shares during the past sixty days.  The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and through the Starboard Value LP Account during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

17

CUSIP NO. 88164L100

K. Mr. Feld

(a) As of the close of business on February 20, 2015, Mr. Feld directly owned 11,541 Shares.  Mr. Feld, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP, may be deemed the beneficial owner of the (i) 1,921,392 Shares owned by Starboard V&O Fund, (ii) 435,019 Shares owned by Starboard S LLC, (iii) 136,342 Shares owned by Starboard C LP and (iv) 682,247 Shares held in the Starboard Value LP Account.

Percentage: Approximately 6.0%

(b) 1. Sole power to vote or direct vote: 11,541

2. Shared power to vote or direct vote: 3,175,000

3. Sole power to dispose or direct the disposition: 11,541

4. Shared power to dispose or direct the disposition: 3,175,000

(c) Mr. Feld has not entered into any transactions in the Shares during the past sixty days. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and through the Starboard Value LP Account during the past sixty days are set forth in Schedule A and are incorporated herein by reference.

18

CUSIP NO. 88164L100

SIGNATURES

After reasonable inquiry and to the best of his knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated:  February 20, 2015

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD By: Starboard Value LP,        its investment manager   STARBOARD VALUE AND OPPORTUNITY S LLC By: Starboard Value LP,        its manager   STARBOARD VALUE AND OPPORTUNITY C LP By: Starboard Value R LP,        its general partner   STARBOARD VALUE R LP By: Starboard Value R GP LLC,        its general partner   STARBOARD VALUE LP By: Starboard Value GP LLC,        its general partner   STARBOARD VALUE GP LLC By: Starboard Principal Co LP,        its member   STARBOARD PRINCIPAL CO LP By: Starboard Principal Co GP LLC,        its general partner   STARBOARD PRINCIPAL CO GP LLC   STARBOARD VALUE R GP LLC

By:	/s/ Jeffrey C. Smith
	Name:	Jeffrey C. Smith
	Title:	Authorized Signatory

/s/ Jeffrey C. Smith

JEFFREY C. SMITH

Individually and as attorney-in-fact for Mark R. Mitchell and Peter A. Feld

19

CUSIP NO. 88164L100

SCHEDULE A

Transactions in the Shares During the Past Sixty Days

Shares of Common Stock Purchased/(Sold) Price Per Share($) Date of Purchase/Sale

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD

(45,387)	39.3681	02/12/2015
(15,129)	39.3789	02/12/2015
(60,517)	39.1269	02/13/2015
(75,645)	39.6707	02/17/2015
(48,414)	39.7365	02/18/2015
(42,361)	39.6796	02/19/2015

(60,517) 39.8656 02/20/2015

STARBOARD VALUE AND OPPORTUNITY S LLC

(10,276)	39.3681	02/12/2015
(3,425)	39.3789	02/12/2015
(13,701)	39.1269	02/13/2015
(17,127)	39.6707	02/17/2015
(10,961)	39.7365	02/18/2015
(9,591)	39.6796	02/19/2015

(13,701) 39.8656 02/20/2015

STARBOARD VALUE AND OPPORTUNITY C LP

(3,221)	39.3681	02/12/2015
(1,074)	39.3789	02/12/2015
(4,294)	39.1269	02/13/2015
(5,368)	39.6707	02/17/2015
(3,435)	39.7365	02/18/2015
(3,006)	39.6796	02/19/2015

(4,294) 39.8656 02/20/2015

STARBOARD VALUE LP

(Through the Starboard Value LP Account)

(16,116)	39.3681	02/12/2015
(5,372)	39.3789	02/12/2015
(21,488)	39.1269	02/13/2015
(26,860)	39.6707	02/17/2015
(17,190)	39.7365	02/18/2015
(15,042)	39.6796	02/19/2015

(21,488) 39.8656 02/20/2015