Starboard Value SC 13D/A Wausau Paper Corp.

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. 15)1

Wausau Paper Corp.

(Name of Issuer)

Common Stock, no par value

(Title of Class of Securities)

943315101

(CUSIP Number)

JEFFREY C. SMITH

STARBOARD VALUE LP

777 Third Avenue, 18th Floor

New York, New York 10017

(212) 845-7977

STEVEN 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)

October 12, 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. 943315101

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 7,500,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 7,500,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,500,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0%
14	TYPE OF REPORTING PERSON PN

2

CUSIP NO. 943315101

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 4,713,392
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 4,713,392
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,713,392
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 9.4%
14	TYPE OF REPORTING PERSON CO

3

CUSIP NO. 943315101

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 1,154,496
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 1,154,496
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,154,496
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 2.3%
14	TYPE OF REPORTING PERSON OO

4

CUSIP NO. 943315101

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 200,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 200,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 200,000
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 PN

5

CUSIP NO. 943315101

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 200,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 200,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 200,000
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 PN

6

CUSIP NO. 943315101

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 200,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 200,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 200,000
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 OO

7

CUSIP NO. 943315101

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 7,500,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 7,500,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,500,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0%
14	TYPE OF REPORTING PERSON OO

8

CUSIP NO. 943315101

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 7,500,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 7,500,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,500,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0%
14	TYPE OF REPORTING PERSON PN

9

CUSIP NO. 943315101

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 7,500,000
	8	SHARED VOTING POWER - 0 -
	9	SOLE DISPOSITIVE POWER 7,500,000
	10	SHARED DISPOSITIVE POWER - 0 -
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,500,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0%
14	TYPE OF REPORTING PERSON OO

10

CUSIP NO. 943315101

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 7,500,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 7,500,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,500,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0%
14	TYPE OF REPORTING PERSON IN

11

CUSIP NO. 943315101

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 7,500,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 7,500,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,500,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0%
14	TYPE OF REPORTING PERSON IN

12

CUSIP NO. 943315101

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 7,500,000
	9	SOLE DISPOSITIVE POWER - 0 -
	10	SHARED DISPOSITIVE POWER 7,500,000
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 7,500,000
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES		o
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 15.0%
14	TYPE OF REPORTING PERSON IN

13

CUSIP NO. 943315101

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

14

CUSIP NO. 943315101

The following constitutes Amendment No. 15 to the Schedule 13D filed by the undersigned (“Amendment No. 15”).  This Amendment No. 15 amends the Schedule 13D as specifically set forth herein.

Item 2. Identity and Background.

Item 2(b) is hereby amended and restated as follows:

(b)           The address of the principal office of each of Starboard S LLC, Starboard C LP, Starboard R LP, Starboard R GP, Starboard Value LP, Starboard Value GP, Principal Co, Principal GP, and Messrs. Smith, Mitchell, Feld and Molinelli is 777 Third Avenue, 18th Floor, New York, New York 10017.  The address of the principal office of Starboard V&O Fund is 89 Nexus Way, Camana Bay, PO Box 31106, Grand Cayman KY1-1205, Cayman Islands.  The officers and directors of Starboard V&O Fund and their principal occupations and business addresses are set forth on Schedule A to the Schedule 13D and are incorporated by reference in this Item 2.

Item 4. Purpose of Transaction.

Item 4 is hereby amended to add the following: 

On October 12, 2015, each of (i) Starboard Value LP and certain of its affiliates (collectively, “Starboard”) and (ii) Gavin Molinelli, a director of the Issuer ("Mr. Molinelli"), entered into voting agreements (the “Voting Agreements”) with SCA Americas Inc., a Delaware corporation (“Parent”), in connection with that certain Agreement and Plan of Merger (the “Merger Agreement”), dated October 12, 2015, by and among the Issuer,  Parent, and Salmon Acquisition, Inc., a Wisconsin corporation (“Merger Sub”) and wholly owned subsidiary of Parent, pursuant to which, Merger Sub will merge with and into the Issuer (the “Merger”), with the Issuer as the surviving entity.

Pursuant to the Voting Agreements, each of Starboard and Mr. Molinelli agreed, among other things, to vote all of the Shares and Options (as defined therein), beneficially owned by each of Starboard and Mr. Molinelli, respectively, in favor of the adoption of the Merger Agreement, the Merger and the other transactions contemplated by the Merger Agreement, on the terms and subject to the conditions set forth in each such Voting Agreement. Each Voting Agreement, subject to certain limitations, will terminate upon the earlier of (i) the effective time of the Merger, (ii) the date on which the Merger Agreement is terminated in accordance with its terms and (iii) the date of any amendment to the Merger Agreement reducing the amount or changing the form of the Merger Consideration (as defined in the Merger Agreement). The foregoing description of the Voting Agreements is qualified in its entirety by reference to the Voting Agreements, which are attached hereto as Exhibits 99.1 and 99.2 and are incorporated herein by reference. 

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 50,082,108 Shares outstanding, as of October 8, 2015, which is the total number of Shares outstanding as reported in the Merger Agreement filed as an exhibit to the Issuer’s Form 8-K filed with the Securities and Exchange Commission on October 13, 2015.

15

CUSIP NO. 943315101

A. Starboard V&O Fund

(a) As of the close of business on October 14, 2015, Starboard V&O Fund beneficially owned 4,713,392 Shares.

Percentage: Approximately 9.4%.

(b) 1. Sole power to vote or direct vote: 4,713,392

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 4,713,392

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

(c) Starboard V&O Fund has not entered into any transactions in the Shares during the past sixty days.

B. Starboard S LLC

(a) As of the close of business on October 14, 2015, Starboard S LLC beneficially owned 1,154,496 Shares.

Percentage: Approximately 2.3%.

(b) 1. Sole power to vote or direct vote: 1,154,496

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 1,154,496

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

(c) Starboard S LLC has not entered into any transactions in the Shares during the past sixty days.

C. Starboard C LP

(a) As of the close of business on October 14, 2015, Starboard C LP beneficially owned 200,000 Shares.

Percentage: Less than 1%.

(b) 1. Sole power to vote or direct vote: 200,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 200,000

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

(c) Starboard C LP has not entered into any transactions in the Shares during the past sixty days.

16

CUSIP NO. 943315101

D. Starboard R LP

(a) Starboard R LP, as the general partner of Starboard C LP, may be deemed the beneficial owner of the 200,000 Shares owned by Starboard C LP.

Percentage: Less than 1%.

(b) 1. Sole power to vote or direct vote: 200,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 200,000

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.

E. Starboard R GP

(a) Starboard R GP, as the general partner of Starboard R LP, may be deemed the beneficial owner of the 200,000 Shares owned by Starboard C LP.

Percentage: Less than 1%.

(b) 1. Sole power to vote or direct vote: 200,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 200,000

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.

F. Starboard Value LP

(a) As of the close of business on October 14, 2015, 1,432,112 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 LP Account and the manager of Starboard S LLC, may be deemed the beneficial owner of the (i) 4,713,392 Shares owned by Starboard V&O Fund, (ii) 1,154,496 Shares owned by Starboard S LLC, (iii) 200,000 Shares owned by Starboard C LP and (iv) 1,432,112 Shares held in the Starboard Value LP Account.

Percentage: Approximately 15.0%.

(b) 1. Sole power to vote or direct vote: 7,500,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 7,500,000

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

(c) Starboard Value LP has not entered into any transactions in the Shares during the past sixty days.

17

CUSIP NO. 943315101

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) 4,713,392 Shares owned by Starboard V&O Fund, (ii) 1,154,496 Shares owned by Starboard S LLC, (iii) 200,000 Shares owned by Starboard C LP and (iv) 1,432,112 Shares held in the Starboard Value LP Account.

Percentage: Approximately 15.0%.

(b) 1. Sole power to vote or direct vote: 7,500,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 7,500,000

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.

H. Principal Co

(a) Principal Co, as a member of Starboard Value GP, may be deemed the beneficial owner of the (i) 4,713,392 Shares owned by Starboard V&O Fund, (ii) 1,154,496 Shares owned by Starboard S LLC, (iii) 200,000 Shares owned by Starboard C LP and (iv) 1,432,112 Shares held in the Starboard Value LP Account.

Percentage: Approximately 15.0%.

(b) 1. Sole power to vote or direct vote: 7,500,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 7,500,000

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.

I. Principal GP

(a) Principal GP, as the general partner of Principal Co, may be deemed the beneficial owner of the (i) 4,713,392 Shares owned by Starboard V&O Fund, (ii) 1,154,496 Shares owned by Starboard S LLC, (iii) 200,000 Shares owned by Starboard C LP and (iv) 1,432,112 Shares held in the Starboard Value LP Account.

Percentage: Approximately 15.0%.

(b) 1. Sole power to vote or direct vote: 7,500,000

2. Shared power to vote or direct vote: 0

3. Sole power to dispose or direct the disposition: 7,500,000

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.

18

CUSIP NO. 943315101

J. 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 (i) 4,713,392 Shares owned by Starboard V&O Fund, (ii) 1,154,496 Shares owned by Starboard S LLC, (iii) 200,000 Shares owned by Starboard C LP and (iv) 1,432,112 Shares held in the Starboard Value LP Account.

Percentage: Approximately 15.0%.

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

2. Shared power to vote or direct vote: 7,500,000

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

4. Shared power to dispose or direct the disposition: 7,500,000

(c) None of Messrs. Smith, Mitchell or Feld has entered into any transactions in the Shares during the past sixty days.

K. Mr. Molinelli

(a) As of the close of business on October 14, 2015, Mr. Molinelli did not own any Shares.

Percentage: 0%

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

2. Shared power to vote or direct vote: 0

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

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

(c) Mr. Molinelli has not entered into any transactions in the Shares during the past sixty days.

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, her or its pecuniary interest therein.

Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

Item 6 is hereby amended to add the following:

On October 12, 2015, each of Starboard and Mr. Molinelli entered into the Voting Agreements with Parent defined and described in Item 4 above and attached as Exhibits 99.1 and 99.2 hereto.

Item 7. Material to be Filed as Exhibits.

Item 7 is hereby amended to add the following exhibits:

99.1 Voting Agreement by and among Starboard Value LP, Starboard Value and Opportunity Master Fund Ltd, Starboard Value and Opportunity S LLC, Starboard Value and Opportunity C LP, Starboard Value GP LLC, Starboard Principal Co LP, Starboard Principal Co GP LLC, Starboard Value R LP, Starboard Value R GP LLC, and SCA Americas Inc., dated October 12, 2015.

99.2 Voting Agreement by and between Gavin Molinelli and SCA Americas Inc., dated October 12, 2015.

19

CUSIP NO. 943315101

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:  October 14, 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 LP By: Starboard Value GP LLC,        its general partner   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 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

/s/ Gavin T. Molinelli

GAVIN T. MOLINELLI

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