SCHEDULE 14A
Proxy Statement Pursuant to Section 14(a)
of the Securities Exchange Act of 1934
(Amendment No. __)

Filed by the Registrant [ ]

Filed by a Party other than the Registrant [x]

Check the appropriate box:

[ ] Preliminary Proxy Statement
[ ] Confidential, for Use of the Commission Only (as permitted by Rule
14a-6(e)(2))
[ ] Definitive Proxy Statement
[ ] Definitive Additional Materials
[X] Soliciting Material Pursuant to 240.14a-12

Mentor Graphics Corporation
(Name of Registrant as Specified In Its Charter)

Icahn Partners LP
Icahn Partners Master Fund LP
Icahn Partners Master Fund II LP
Icahn Partners Master Fund III LP
High River Limited Partnership
Hopper Investments LLC
Barberry Corp.
Icahn Onshore LP
Icahn Offshore LP
Icahn Capital L.P.
IPH GP LLC
Icahn Enterprises Holdings L.P.
Icahn Enterprises G.P. Inc.
Beckton Corp.
Carl C. Icahn
Brett Icahn
David Schechter
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (check the appropriate box):

[X] No fee required.

[ ] Fee computed on table below per Exchange Act Rule 14a-6(i)(4) and 0-11.

1) Title of each class of securities to which transaction applies:

2) Aggregate number of securities to which transaction applies:

3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

4) Proposed maximum aggregate value of transaction:

5) Total fee paid:

[ ] Fee paid previously with preliminary materials.

[ ] Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

1) Amount Previously Paid:

2) Form, Schedule or Registration Statement No.:

3) Filing Party:

4) Date Filed:


On February 8, 2010, Carl C. Icahn and affiliated entities filed an amendment to their Schedule 13D relating to Mentor Graphics Corporation disclosing their intention to nominate individuals for election as directors at the 2011 annual meeting, a copy of which is filed herewith as Exhibit 2.

SECURITY HOLDERS ARE ADVISED TO READ THE PROXY STATEMENT AND OTHER DOCUMENTS RELATED TO THE SOLICITATION OF PROXIES BY CARL C. ICAHN AND HIS AFFILIATES FROM THE STOCKHOLDERS OF MENTOR GRAPHICS CORPORATION FOR USE AT ITS 2011 ANNUAL MEETING WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION, INCLUDING INFORMATION RELATING TO THE PARTICIPANTS IN SUCH PROXY SOLICITATION. WHEN COMPLETED, A DEFINITIVE PROXY STATEMENT AND A FORM OF PROXY WILL BE MAILED TO STOCKHOLDERS OF MENTOR GRAPHICS CORPORATION AND WILL ALSO BE AVAILABLE AT NO CHARGE AT THE SECURITIES AND EXCHANGE COMMISSION'S WEBSITE AT HTTP://WWW.SEC.GOV. INFORMATION RELATING TO THE PARTICIPANTS IN SUCH PROXY SOLICITATION IS CONTAINED IN EXHIBIT 1 HERETO.


EXHIBIT 1

PARTICIPANTS

The participants in the solicitation of proxies (the "Participants") may include the following: Icahn Partners LP ("Icahn Partners"), Icahn Onshore LP ("Icahn Onshore"), Icahn Partners Master Fund LP ("Icahn Master"), Icahn Partners Master Fund II LP ("Icahn Master II"), Icahn Partners Master Fund III LP ("Icahn Master III"), Icahn Offshore LP ("Icahn Offshore"), Icahn Capital LP ("Icahn Capital"), IPH GP LLC ("IPH"), Icahn Enterprises Holdings L.P. ("Icahn Enterprises Holdings"), Icahn Enterprises G.P. Inc. ("Icahn Enterprises GP"), Beckton Corp. ("Beckton"), High River Limited Partnership ("High River"), Hopper Investments LLC ("Hopper"), Barberry Corp. ("Barberry"), Mr. Carl C. Icahn, Mr. Brett Icahn and Mr. David S. Schechter.

Icahn Partners, Icahn Master, Icahn Master II, Icahn Master III and High River (collectively, the "Icahn Parties") are entities controlled by Carl C. Icahn. Brett Icahn and David S. Schechter are employees of the Icahn Parties who may also participate in soliciting proxies from the stockholders of Mentor Graphics Corporation (the "Issuer"). Neither Brett Icahn nor David Schechter own beneficially any interest in securities of the Issuer, and will not receive any special compensation in connection with such solicitation.

Icahn Partners is a Delaware limited partnership principally engaged in the business of investing in securities. Icahn Onshore, a Delaware limited partnership, is the general partner of Icahn Partners. Each of Icahn Master, Icahn Master II and Icahn Master III is a Cayman Islands exempted limited partnership principally engaged in the business of investing in securities. Icahn Offshore, a Delaware limited partnership, is the general partner of each of Icahn Master, Icahn Master II and Icahn Master III. Icahn Capital, a Delaware limited partnership, is the general partner of each of Icahn Onshore and Icahn Offshore. IPH, a Delaware limited liability company, is the general partner of Icahn Capital. Icahn Enterprises Holdings, a Delaware limited partnership, is the sole member of IPH. Icahn Enterprises GP, a Delaware corporation, is the general partner of Icahn Enterprises Holdings. Beckton, a Delaware corporation, is the sole stockholder of Icahn Enterprises GP. High River is a Delaware limited partnership principally engaged in the business of investing in securities. Hopper, a Delaware limited liability company, is the general partner of High River. Barberry, a Delaware corporation, is the managing member of Hopper. Each of Beckton and Barberry is wholly owned by Carl C. Icahn. Mr. Icahn, through his ownership of Beckton and Barberry, indirectly controls each of the Icahn Parties.

Brett Icahn and David S. Schechter are employees and/or officers or directors of the Icahn Parties and various other entities controlled by Mr. Icahn. In connection with their employment by Icahn Capital LP, Brett Icahn and David Schechter each has a participatory interest in the profits derived by its affiliated entities from their investment in certain companies, including the Issuer. The participatory interests of Messrs. Icahn and Schechter entitle them each to 5.1% of the aggregate profits from such investments after an 8% hurdle rate is achieved.

Mr. Icahn, through his control of the Icahn Parties, may be deemed to be the indirect beneficial owner of 16,120,289 shares of common stock of the Issuer, without par value ("Shares"), which represents approximately 14.70% of the outstanding Shares as of the date hereof.

High River has sole voting power and sole dispositive power with regard to 3,224,057 Shares. Each of Hopper, Barberry and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master has sole voting power and sole dispositive power with regard to 5,568,678 Shares. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master II has sole voting power and sole dispositive power with regard to 1,632,955 Shares. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master III has sole voting power and sole dispositive power with regard to 786,410 Shares. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Partners has sole voting power and sole dispositive power with regard to 4,908,189 Shares. Each of Icahn Onshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares.

Each of Hopper, Barberry and Mr. Icahn, by virtue of their relationships to High River, may be deemed to indirectly beneficially own the Shares which High River directly beneficially owns. Each of Icahn Onshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn, by virtue of their relationships to Icahn Partners, may be deemed to indirectly beneficially own the Shares which Icahn Partners directly beneficially owns. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn, by virtue of their relationships to Icahn Master, Icahn Master II and Icahn Master III, may be deemed to indirectly beneficially own the Shares which Icahn Master, Icahn Master II and Icahn Master III directly beneficially own.

EXHIBIT 2

Amendment No. 8 to Schedule 13D

[see attached]


SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934 (Amendment No. 8)*

Mentor Graphics Corporation
(Name of Issuer)

Common Stock, without par value
(Title of Class of Securities)

587200106
(CUSIP Number)

Marc Weitzen
Icahn Capital LP
767 Fifth Avenue, 47th Floor
New York, New York 10153
(212) 702-4300

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

February 8, 2011
(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 Section 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 Rule 13d-7 for other parties to whom copies are to be sent.

*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).


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
High River Limited Partnership

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 3,224,057

8 SHARED VOTING POWER 0

9 SOLE DISPOSITIVE POWER 3,224,057

10 SHARED DISPOSITIVE POWER
0

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
3,224,057

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
 2.94%

14 TYPE OF REPORTING PERSON
 PN

 SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
 Hopper Investments LLC

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 (a) / /
 (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 0

8 SHARED VOTING POWER 3,224,057

9 SOLE DISPOSITIVE POWER 0

10 SHARED DISPOSITIVE POWER
3,224,057

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
3,224,057

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
2.94%

14 TYPE OF REPORTING PERSON

OO


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
Barberry Corp.

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 0

8 SHARED VOTING POWER 3,224,057

9 SOLE DISPOSITIVE POWER 0

10 SHARED DISPOSITIVE POWER
3,224,057

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
3,224,057

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
2.94%

14 TYPE OF REPORTING PERSON

CO


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
Icahn Partners Master Fund LP

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 5,568,678

8 SHARED VOTING POWER 0

9 SOLE DISPOSITIVE POWER 5,568,678

10 SHARED DISPOSITIVE POWER
0

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,568,678

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
5.08%

14 TYPE OF REPORTING PERSON

PN


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
Icahn Partners Master Fund II LP

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 1,632,955

8 SHARED VOTING POWER 0

9 SOLE DISPOSITIVE POWER 1,632,955

10 SHARED DISPOSITIVE POWER
0

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
1,632,955

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
1.49%

14 TYPE OF REPORTING PERSON

PN


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
Icahn Partners Master Fund III LP

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 786,410

8 SHARED VOTING POWER 0

9 SOLE DISPOSITIVE POWER 786,410

10 SHARED DISPOSITIVE POWER
0

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
786,410

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
 0.72%

14 TYPE OF REPORTING PERSON
 PN

 SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
 Icahn Offshore LP

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 (a) / /
 (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 0

8 SHARED VOTING POWER 7,988,043

9 SOLE DISPOSITIVE POWER 0

10 SHARED DISPOSITIVE POWER
7,988,043

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
7,988,043

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
7.28%

14 TYPE OF REPORTING PERSON

PN


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
Icahn Partners LP

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 4,908,189

8 SHARED VOTING POWER 0

9 SOLE DISPOSITIVE POWER 4,908,189

10 SHARED DISPOSITIVE POWER
0

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
4,908,189

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
4.48%

14 TYPE OF REPORTING PERSON

PN


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
Icahn Onshore LP

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 0

8 SHARED VOTING POWER 4,908,189

9 SOLE DISPOSITIVE POWER 0

10 SHARED DISPOSITIVE POWER
4,908,189

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
4,908,189

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
4.48%

14 TYPE OF REPORTING PERSON

PN


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
Icahn Capital LP

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 0

8 SHARED VOTING POWER 12,896,232

9 SOLE DISPOSITIVE POWER 0

10 SHARED DISPOSITIVE POWER
12,896,232

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
12,896,232

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
11.76%

14 TYPE OF REPORTING PERSON

PN


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON IPH GP LLC

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 0

8 SHARED VOTING POWER 12,896,232

9 SOLE DISPOSITIVE POWER 0

10 SHARED DISPOSITIVE POWER
12,896,232

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
12,896,232

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
11.76%

14 TYPE OF REPORTING PERSON

OO


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
Icahn Enterprises Holdings L.P.

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 0

8 SHARED VOTING POWER 12,896,232

9 SOLE DISPOSITIVE POWER 0

10 SHARED DISPOSITIVE POWER
12,896,232

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
12,896,232

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
11.76%

14 TYPE OF REPORTING PERSON

PN


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON Icahn Enterprises G.P. Inc.

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 0

8 SHARED VOTING POWER 12,896,232

9 SOLE DISPOSITIVE POWER 0

10 SHARED DISPOSITIVE POWER
12,896,232

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
12,896,232

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
11.76%

14 TYPE OF REPORTING PERSON

CO


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON
Beckton Corp.

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS WC

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 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 0

8 SHARED VOTING POWER 12,896,232

9 SOLE DISPOSITIVE POWER 0

10 SHARED DISPOSITIVE POWER
12,896,232

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
12,896,232

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
11.76%

14 TYPE OF REPORTING PERSON

CO


SCHEDULE 13D

CUSIP No. 587200106

1 NAME OF REPORTING PERSON Carl C. Icahn

2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) / / (b) / /

3 SEC USE ONLY

4 SOURCE OF FUNDS

5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) / /

6 CITIZENSHIP OR PLACE OF ORGANIZATION
United States of America

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

7 SOLE VOTING POWER 0

8 SHARED VOTING POWER 16,120,289

9 SOLE DISPOSITIVE POWER 0

10 SHARED DISPOSITIVE POWER
16,120,289

11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
16,120,289

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES / /

13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
14.70%

14 TYPE OF REPORTING PERSON

IN


SCHEDULE 13D

Item 1. Security and Issuer

The Schedule 13D filed with the Securities and Exchange Commission on May 27, 2010 (the "Initial 13D"), by the Reporting Persons with respect to the shares of Common Stock, without par value (the "Shares"), issued by Mentor Graphics Corporation (the "Issuer"), is hereby amended to furnish the additional information set forth herein. All capitalized terms contained herein but not otherwise defined shall have the meanings ascribed to such terms in the Initial 13D.

Item 3. Source and Amount of Funds or Other Consideration

Item 3 of the Initial 13D is hereby amended and restated in its entirety as
follows:

The Reporting Persons hold, in the aggregate, 16,120,289 Shares. The aggregate purchase price of the Shares purchased by the Reporting Persons collectively was $146,433,694 (including commissions and premiums for the options to purchase Shares). The source of funding for the purchase of these Shares was the general working capital of the respective purchasers. The Shares are held by the Reporting Persons in margin accounts together with other securities. Such margin accounts may from time to time have debit balances. Part of the purchase price of the Shares purchased by the Reporting Persons was obtained through margin borrowing. As of the close of business on February 7, 2011, the indebtedness of (i) High River's margin account was approximately $767,237,936, (ii) Icahn Partners' margin account was approximately $577,082,565, (iii) Icahn Master's margin account was approximately $756,279,432, (iv) Icahn Master II's margin account was approximately $285,031,934, and (v) Icahn Master III's margin account was approximately $66,422,893.

Item 4. Purpose of Transaction.

Item 4 of the Initial 13D is hereby amended to add the following:

Mentor Graphics Corporation (the "Company") on Friday, February 4, 2010, announced that it will hold its 2011 annual meeting of shareholders six weeks earlier than last year, and left shareholders with only 10 days to nominate a dissident slate. We, at that time, called the Company and stated that, in light of our prior friendly discussions, we viewed the announcement as a hostile and unprovoked defensive tactic intended to impede shareholder rights. We asked the Company to rescind the announcement, which it refused to do. We therefore currently intend to nominate three individuals for election as directors of the Company at the 2011 annual meeting, but reserve the right to nominate a different number of individuals, up to a full slate. We intend to notify the Company as to the composition of our slate prior to the new deadline.

SECURITY HOLDERS ARE ADVISED TO READ THE PROXY STATEMENT AND OTHER DOCUMENTS RELATED TO THE SOLICITATION OF PROXIES BY CARL C. ICAHN AND HIS AFFILIATES FROM THE STOCKHOLDERS OF MENTOR GRAPHICS CORPORATION FOR USE AT ITS 2011 ANNUAL MEETING WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION, INCLUDING INFORMATION RELATING TO THE PARTICIPANTS IN SUCH PROXY SOLICITATION. WHEN COMPLETED, A DEFINITIVE PROXY STATEMENT AND A FORM OF PROXY WILL BE MAILED TO STOCKHOLDERS OF MENTOR GRAPHICS CORPORATION AND WILL ALSO BE AVAILABLE AT NO CHARGE AT THE SECURITIES AND EXCHANGE COMMISSION'S WEBSITE AT HTTP://WWW.SEC.GOV.

Item 5. Interest in Securities of the Issuer

Item 5 of the Initial 13D is hereby amended and restated in its entirety as
follows:

(a) The Reporting Persons may be deemed to beneficially own, in the aggregate, 16,120,289 Shares, representing approximately 14.70% of the Issuer's outstanding Shares (based upon the 109,672,191 Shares stated to be outstanding as of December 3, 2010 by the Issuer in the Issuer's quarterly report on Form 10-Q filed with the Securities and Exchange Commission on December 7, 2010).

(b) High River has sole voting power and sole dispositive power with regard to 3,224,057 Shares. Each of Hopper, Barberry and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master has sole voting power and sole dispositive power with regard to 5,568,678 Shares. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master II has sole voting power and sole dispositive power with regard to 1,632,955 Shares. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master III has sole voting power and sole dispositive power with regard to 786,410 Shares. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Partners has sole voting power and sole dispositive power with regard to 4,908,189 Shares. Each of Icahn Onshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares.

Each of Hopper, Barberry and Mr. Icahn, by virtue of their relationships to High River (as disclosed in Item 2), may be deemed to indirectly beneficially own (as that term is defined in Rule 13d-3 under the Act) the Shares which High River directly beneficially owns. Each of Hopper, Barberry and Mr. Icahn disclaims beneficial ownership of such Shares for all other purposes. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn, by virtue of their relationships to each of Icahn Master, Icahn Master II and Icahn Master III (as disclosed in Item 2), may be deemed to indirectly beneficially own (as that term is defined in Rule 13d-3 under the Act) the Shares which each of Icahn Master, Icahn Master II and Icahn Master III directly beneficially owns. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn disclaims beneficial ownership of such Shares for all other purposes. Each of Icahn Onshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn, by virtue of their relationships to Icahn Partners (as disclosed in Item 2), may be deemed to indirectly beneficially own (as that term is defined in Rule 13d-3 under the Act) the Shares which Icahn Partners directly beneficially owns. Each of Icahn Onshore, Icahn Capital, IPH, Icahn Enterprises Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn disclaims beneficial ownership of such Shares for all other purposes.

(c) There were no transactions with respect to the Shares effected by the Reporting Persons during the past sixty days.


SIGNATURE

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

Dated: February 8, 2011

ICAHN PARTNERS MASTER FUND LP
ICAHN PARTNERS MASTER FUND II LP
ICAHN PARTNERS MASTER FUND III LP
ICAHN OFFSHORE LP
ICAHN PARTNERS LP
ICAHN ONSHORE LP
BECKTON CORP.
HOPPER INVESTMENTS LLC
BARBERRY CORP.
HIGH RIVER LIMITED PARTNERSHIP
By: Hopper Investments LLC, general partner

By: /s/ Edward E. Mattner
 ------------------------
 Name: Edward E. Mattner
 Title: Authorized Signatory

ICAHN CAPITAL LP
By: IPH GP LLC, its general partner By: Icahn Enterprises Holdings L.P., its sole member By: Icahn Enterprises G.P. Inc., its general partner
IPH GP LLC
By: Icahn Enterprises Holdings L.P., its sole member By: Icahn Enterprises G.P. Inc., its general partner
ICAHN ENTERPRISES HOLDINGS L.P.
By: Icahn Enterprises G.P. Inc., its general partner
ICAHN ENTERPRISES G.P. INC.

 By: /s/ Dominick Ragone
 ---------------------
 Name: Dominick Ragone
 Title: Chief Financial Officer




/s/ Carl C. Icahn
--------------------
CARL C. ICAHN

[Signature Page of Schedule 13D - Mentor Graphics Corporation]

Mentor Graphics Corp. (NASDAQ:MENT)
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