Calgon Carbon SC 13D/A CALGON CARBON / Starboard Value ownership change

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. 1)1

Calgon Carbon Corporation

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

129603106

(CUSIP Number)

JEFFREY C. SMITH

STARBOARD VALUE LP

830 Third Avenue, 3rd Floor

New York, New York 10022

(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 27, 2013

(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. 129603106

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 3,015,003
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 3,015,003
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,015,003
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.6%
14	TYPE OF REPORTING PERSON CO

2

CUSIP NO. 129603106

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 668,550
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 668,550
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 668,550
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 1.2%
14	TYPE OF REPORTING PERSON OO

3

CUSIP NO. 129603106

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 4,965,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 4,965,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,965,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.2%
14	TYPE OF REPORTING PERSON PN

4

CUSIP NO. 129603106

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 4,965,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 4,965,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,965,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.2%
14	TYPE OF REPORTING PERSON OO

5

CUSIP NO. 129603106

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 4,965,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 4,965,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,965,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.2%
14	TYPE OF REPORTING PERSON PN

6

CUSIP NO. 129603106

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 4,965,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 4,965,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,965,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.2%
14	TYPE OF REPORTING PERSON OO

7

CUSIP NO. 129603106

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 4,965,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 4,965,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,965,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.2%
14	TYPE OF REPORTING PERSON IN

8

CUSIP NO. 129603106

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 4,965,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 4,965,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,965,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.2%
14	TYPE OF REPORTING PERSON IN

9

CUSIP NO. 129603106

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 - 0 -
	8	SHARED VOTING POWER 4,965,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 4,965,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,965,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.2%
14	TYPE OF REPORTING PERSON IN

10

CUSIP NO. 129603106

1	NAME OF REPORTING PERSON LOUIS S. MASSIMO
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS PF
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 1,000
	8	SHARED VOTING POWER - 0-
	9	SOLE DISPOSITIVE POWER 1,000
	10	SHARED DISPOSITIVE POWER - 0-
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Less than 1%
14	TYPE OF REPORTING PERSON IN

11

CUSIP NO. 129603106

1	NAME OF REPORTING PERSON LEE D. MEYER
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP		(a) o   (b) o
3	SEC USE ONLY
4	SOURCE OF FUNDS PF
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 402
	8	SHARED VOTING POWER - 0-
	9	SOLE DISPOSITIVE POWER 402
	10	SHARED DISPOSITIVE POWER - 0-
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 402
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 IN

12

CUSIP NO. 129603106

The following constitutes Amendment No. 1 to the Schedule 13D filed by the undersigned (“Amendment No. 1”).  This Amendment No. 1 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 as follows:

The Shares purchased by each of Starboard V&O Fund and Starboard LLC and held in the Starboard Value LP Accounts 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 3,015,003 Shares beneficially owned by Starboard V&O Fund is approximately $44,158,222, excluding brokerage commissions.  The aggregate purchase price of the 668,550 Shares beneficially owned by Starboard LLC is approximately $9,794,348, excluding brokerage commissions.  The aggregate purchase price of the 1,281,447 Shares held in the Starboard Value LP Accounts is approximately $19,072,564, excluding brokerage commissions.

The Shares owned by Messrs. Massimo and Meyer were purchased with personal funds 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 1,000 Shares beneficially owned by Mr. Massimo is approximately $16,000, excluding brokerage commissions. The aggregate purchase price of the 402 Shares beneficially owned by Mr. Meyer is approximately $6,441, excluding brokerage commissions.

Item 5. Interest in Securities of the Issuer.

Items 5(a) - 5(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 53,926,617 Shares outstanding, as of February 22, 2013, which is the total number of Shares outstanding as reported in the Issuer’s Annual Report on Form 10-K filed with the Securities and Exchange Commission on February 27, 2013.

A. Starboard V&O Fund

(a) As of the close of business on February 28, 2013, Starboard V&O Fund beneficially owned 3,015,003 Shares.

Percentage: Approximately 5.6%

(b) 1. Sole power to vote or direct vote: 3,015,003

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 3,015,003

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

(c) The transactions in the Shares by Starboard V&O Fund since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

13

CUSIP NO. 129603106

B. Starboard LLC

(a) As of the close of business on February 28, 2013, Starboard LLC beneficially owned 668,550 Shares.

Percentage: 1.2%

(b) 1. Sole power to vote or direct vote: 668,550

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 668,550

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

(c) The transactions in the Shares by Starboard LLC since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

C. Starboard Value LP

(a) As of the close of business on February 28, 2013, 1,281,447 Shares were held in the Starboard Value LP Accounts.  Starboard Value LP, as the investment manager of Starboard V&O Fund and the Starboard Value LP Accounts and the manager of Starboard LLC, may be deemed the beneficial owner of the (i) 3,015,003 Shares owned by Starboard V&O Fund, (ii) 668,550 Shares owned by Starboard LLC and (iii) 1,281,447 Shares held in the Starboard Value LP Accounts.

Percentage: Approximately 9.2%

(b) 1. Sole power to vote or direct vote: 4,965,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 4,965,000

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 Accounts and on behalf of each of Starboard V&O Fund and Starboard LLC since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

D. Starboard Value GP

(a) Starboard Value GP, as the general partner of Starboard Value LP, may be deemed the beneficial owner of the (i) 3,015,003 Shares owned by Starboard V&O Fund, (ii) 668,550 Shares owned by Starboard LLC and (iii) 1,281,447 Shares held in the Starboard Value LP Accounts.

Percentage: Approximately 9.2%

(b) 1. Sole power to vote or direct vote: 4,965,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 4,965,000

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

14

CUSIP NO. 129603106

(c) Starboard Value GP has not entered into any transactions in the Shares since the filing of the Schedule 13D.  The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard LLC and through the Starboard Value LP Accounts since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

E. Principal Co

(a) Principal Co, as a member of Starboard Value GP, may be deemed the beneficial owner of the (i) 3,015,003 Shares owned by Starboard V&O Fund, (ii) 668,550 Shares owned by Starboard LLC and (iii) 1,281,447 Shares held in the Starboard Value LP Accounts.

Percentage: Approximately 9.2%

(b) 1. Sole power to vote or direct vote: 4,965,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 4,965,000

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

(c) Principal Co has not entered into any transactions in the Shares since the filing of the Schedule 13D.  The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard LLC and through the Starboard Value LP Accounts since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

F. Principal GP

(a) Principal GP, as the general partner of Principal Co, may be deemed the beneficial owner of the (i) 3,015,003 Shares owned by Starboard V&O Fund, (ii) 668,550 Shares owned by Starboard LLC and (iii) 1,281,447 Shares held in the Starboard Value LP Accounts.

Percentage: Approximately 9.2%

(b) 1. Sole power to vote or direct vote: 4,965,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 4,965,000

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

(c) Principal GP has not entered into any transactions in the Shares since the filing of the Schedule 13D. The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard LLC and through the Starboard Value LP Accounts since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

G. Messrs. Smith, Mitchell and Feld

(a) Each of Messrs. Smith, Mitchell and 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) 3,015,003 Shares owned by Starboard V&O Fund, (ii) 668,550 Shares owned by Starboard LLC and (iii) 1,281,447 Shares held in the Starboard Value LP Accounts.

Percentage: Approximately 9.2%

15

CUSIP NO. 129603106

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

2. Shared power to vote or direct vote: 4,965,000

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

4. Shared power to dispose or direct the disposition: 4,965,000

(c) None of Messrs. Smith, Mitchell or Feld has entered into any transactions in the Shares since the filing of the Schedule 13D.  The transactions in the Shares on behalf of each of Starboard V&O Fund, Starboard LLC and through the Starboard Value LP Accounts since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

H. Mr. Massimo

(a) As of the close of business on February 28, 2013, Mr. Massimo beneficially owned 1,000 Shares.

Percentage: Less than 1%

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

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 1,000

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

(c) The transactions in the Shares by Mr. Massimo since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

I. Mr. Meyer

(a) As of the close of business on February 28, 2013, Mr. Meyer beneficially owned 402 Shares.

Percentage: Less than 1%

(b) 1. Sole power to vote or direct vote: 402

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 402

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

(c) The transactions in the Shares by Mr. Meyer since the filing of the Schedule 13D are set forth in Schedule A and are incorporated herein by reference.

An aggregate of 4,966,402 Shares, constituting approximately 9.2% of the Shares outstanding, are reported in this Amendment No. 1.

Each Reporting Person, as a member of a “group” with the other Reporting Persons for the purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended, may be deemed the beneficial owner of the Shares directly owned by the other Reporting Persons.  Each Reporting Person disclaims beneficial ownership of such Shares except to the extent of his or its pecuniary interest therein.

16

CUSIP NO. 129603106

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:  March 1, 2013

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 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

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, Peter A. Feld, Louis S. Massimo and Lee D. Meyer

17

CUSIP NO. 129603106

SCHEDULE A

Transactions in the Shares Since the Filing of the Schedule 13D

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

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD

31,500	15.7955	01/22/2013
31,500	15.8851	01/22/2013
31,300	15.6986	02/04/2013
46,950	15.8707	02/07/2013
31,300	16.4609	02/08/2013
31,300	16.2482	02/11/2013
21,691	16.2507	02/12/2013
9,609	16.1909	02/12/2013

STARBOARD VALUE AND OPPORTUNITY S LLC

7,000	15.7955	01/22/2013
7,000	15.8851	01/22/2013
7,000	15.6986	02/04/2013
10,500	15.8707	02/07/2013
7,000	16.4609	02/08/2013
7,000	16.2482	02/11/2013
4,851	16.2507	02/12/2013
2,149	16.1909	02/12/2013

STARBOARD VALUE LP

(Through the Starboard Value LP Accounts)

11,500	15.7955	01/22/2013
11,500	15.8851	01/22/2013
78,863	16.1180	01/28/2013
21,137	16.3736	01/29/2013
50,000	16.2890	01/30/2013
11,700	15.6986	02/04/2013
10,000	15.7500	02/05/2013
5,800	15.7419	02/06/2013
26,750	15.8707	02/07/2013
11,700	16.4609	02/08/2013
11,700	16.2482	02/11/2013
18,458	16.2507	02/12/2013
8,242	16.1909	02/12/2013

LOUIS S. MASSIMO

1,000 16.0000 01/24/2013

LEE D. MEYER

402 16.0220 01/24/2013