SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                               (Amendment No. 5)*

                          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)

                                 July 22, 2010
            (Date of Event which Required 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
      2,792,715

8   SHARED  VOTING  POWER
      0

9   SOLE  DISPOSITIVE  POWER
      2,792,715

10  SHARED  DISPOSITIVE  POWER
      0

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      2,792,715

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      2.61%

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
      2,792,715

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      2,792,715

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      2,792,715

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      2.61%

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
      2,792,715

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      2,792,715

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      2,792,715

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      2.61%

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
      4,827,214

8   SHARED  VOTING  POWER
      0

9   SOLE  DISPOSITIVE  POWER
      4,827,214

10  SHARED  DISPOSITIVE  POWER
      0

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      4,827,214

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      4.52%

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
      1,392,042

8   SHARED  VOTING  POWER
      0

9   SOLE  DISPOSITIVE  POWER
      1,392,042

10  SHARED  DISPOSITIVE  POWER
      0

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      1,392,042

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      1.30%

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
      685,061

8   SHARED  VOTING  POWER
      0

9   SOLE  DISPOSITIVE  POWER
      685,061

10  SHARED  DISPOSITIVE  POWER
      0

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      685,061

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      0.64%

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
      6,904,317

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      6,904,317

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      6,904,317

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      6.46%

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
      4,266,547

8   SHARED  VOTING  POWER
      0

9   SOLE  DISPOSITIVE  POWER
      4,266,547

10  SHARED  DISPOSITIVE  POWER
      0

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      4,266,547

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      3.99%

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
      4,266,547

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      4,266,547

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      4,266,547

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      3.99%

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
      11,170,864

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      11,170,864

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      11,170,864

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      10.46%

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
      11,170,864

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      11,170,864

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      11,170,864

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      10.46%

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
      11,170,864

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      11,170,864

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      11,170,864

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      10.46%

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
      11,170,864

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      11,170,864

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      11,170,864

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      10.46%

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
      11,170,864

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      11,170,864

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      11,170,864

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      10.46%

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
      13,963,579

9   SOLE  DISPOSITIVE  POWER
      0

10  SHARED  DISPOSITIVE  POWER
      13,963,579

11  AGGREGATE  AMOUNT  BENEFICIALLY  OWNED  BY  EACH  REPORTING  PERSON
      13,963,579

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

13  PERCENT  OF  CLASS  REPRESENTED  BY  AMOUNT  IN  ROW  (11)
      13.07%

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, 13,963,579 Shares (including
Shares underlying call options. See Item 5). The aggregate purchase price of the
Shares  purchased  by  the  Reporting  Persons  collectively  was  $90,762,134
(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 July 21, 2010, the indebtedness of (i) High
River's  margin  account  was  approximately  $693,848,574, (ii) Icahn Partners'
margin  account  was  approximately  $137,378,588,  (iii)  Icahn Master's margin
account  was  approximately  $119,907,544, (iv) Icahn Master II's margin account
was  approximately  $31,983,231,  and  (v) Icahn Master III's margin account was
approximately  $23,574,486.

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,  13,963,579  Shares  (including  Shares  underlying  call  options),
representing approximately 13.07% of the Issuer's outstanding Shares (based upon
the 106,827,894 Shares stated to be outstanding as of June 4, 2010 by the Issuer
in  the  Issuer's  quarterly  report  on Form 10-Q filed with the Securities and
Exchange  Commission  on  June  8,  2010).

     (b) High River has sole voting power and sole dispositive power with regard
to  2,792,715 Shares (including Shares underlying call options). 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  4,827,214  Shares  (including  Shares  underlying  call
options).  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 1,392,042 Shares
(including  Shares  underlying  call  options).  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  685,061  Shares  (including Shares underlying call options). 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 4,266,547 Shares (including
Shares  underlying  call  options).  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)  The following table sets forth all transactions with respect to Shares
effected  by  any  of  the Reporting Persons since their last filing on Schedule
13D.  Except  as  otherwise noted below, all such transactions were purchases of
Shares  effected  in the open market, and the table includes commissions paid in
per  share  prices.


Name of              Date of               No. of                Purchase
Reporting            of                    Shares                Price per
Person               Transaction           Purchased             Share
- ----------------     -----------           ---------             ---------
High River            07/07/2010          (1) 20,000              (2) 2.96
High River            07/08/2010          (1) 26,949              (2) 3.36
High River            07/09/2010           (1) 8,732              (2) 3.43
High River            07/12/2010          (1) 17,780              (2) 3.42
High River            07/13/2010          (1) 33,937              (2) 3.74
High River            07/14/2010          (1) 37,354              (2) 3.77
High River            07/15/2010          (1) 15,457              (2) 3.68
High River            07/19/2010           (1) 2,027              (2) 3.24
High River            07/20/2010          (1) 20,000              (2) 3.30
High River            07/21/2010          (1) 20,000              (2) 3.40
High River            07/22/2010          (1) 40,000              (2) 3.76

Icahn Partners        07/07/2010          (1) 34,904              (2) 2.96
Icahn Partners        07/08/2010          (1) 47,032              (2) 3.36
Icahn Partners        07/09/2010          (1) 15,238              (2) 3.43
Icahn Partners        07/12/2010          (1) 31,030              (2) 3.42
Icahn Partners        07/13/2010          (1) 59,228              (2) 3.74
Icahn Partners        07/14/2010          (1) 65,191              (2) 3.77
Icahn Partners        07/15/2010          (1) 26,978              (2) 3.68
Icahn Partners        07/19/2010           (1) 3,538              (2) 3.24
Icahn Partners        07/20/2010          (1) 34,905              (2) 3.30
Icahn Partners        07/21/2010          (1) 34,905              (2) 3.40
Icahn Partners        07/22/2010          (1) 69,807              (2) 3.76

Icahn Master          07/07/2010          (1) 39,491              (2) 2.96
Icahn Master          07/08/2010          (1) 53,211              (2) 3.36
Icahn Master          07/09/2010          (1) 17,242              (2) 3.43
Icahn Master          07/12/2010          (1) 35,110              (2) 3.42
Icahn Master          07/13/2010          (1) 67,010              (2) 3.74
Icahn Master          07/14/2010          (1) 73,758              (2) 3.77
Icahn Master          07/15/2010          (1) 30,521              (2) 3.68
Icahn Master          07/19/2010           (1) 4,003              (2) 3.24
Icahn Master          07/20/2010          (1) 39,491              (2) 3.30
Icahn Master          07/21/2010          (1) 39,491              (2) 3.40
Icahn Master          07/22/2010          (1) 78,983              (2) 3.76

Icahn Master III      07/07/2010           (1) 5,605              (2) 2.96
Icahn Master III      07/08/2010           (1) 7,551              (2) 3.36
Icahn Master III      07/09/2010           (1) 2,446              (2) 3.43
Icahn Master III      07/12/2010           (1) 4,982              (2) 3.42
Icahn Master III      07/13/2010           (1) 9,511              (2) 3.74
Icahn Master III      07/14/2010          (1) 10,467              (2) 3.77
Icahn Master III      07/15/2010           (1) 4,331              (2) 3.68
Icahn Master III      07/19/2010             (1) 569              (2) 3.24
Icahn Master III      07/20/2010           (1) 5,604              (2) 3.30
Icahn Master III      07/21/2010           (1) 5,604              (2) 3.40
Icahn Master III      07/22/2010          (1) 11,210              (2) 3.76
_________________________
(1)  Shares  underlying  American-style call options purchased by the applicable
     Reporting  Person  in  the over-the-counter market, which expire on June 7,
     2012.
(2)  This amount represents the cost of an applicable American-style call option
     to  purchase  one Share. The per share exercise price of these call options
     is $5.65. This exercise price will be adjusted to account for any dividends
     or  other  distributions  declared  by  the Issuer prior to exercise of the
     options.

Item 6. Contracts, Arrangements, Understandings or Relationship with Respect to
        Securities of the Issuer

     Item  6  of  the  Initial  13D  is  hereby  amended  to  add the following:

     The  Reporting  Persons  have  purchased  American-style  call  options
referencing  an aggregate of 6,194,756 Shares, which expire on June 7, 2012. The
agreements provide for physical settlement (unless the Reporting Person opts for
a cash settlement). These agreements do not give the Reporting Persons direct or
indirect  voting,  investment  or  dispositive  control over the Shares to which
these  agreements  relate.  These agreements are further described in Item 5(c).

     The  Reporting  Persons have sold European-style put options referencing an
aggregate  of  6,194,756  Shares,  which  expire on June 7, 2012. The agreements
provide  that  they  settle  in cash. These agreements do not give the Reporting
Persons  direct  or  indirect voting, investment or dispositive control over the
Shares  to  which  these  agreements  relate.




                                   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:  July  22,  2010


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]