Definitive Additional Materials

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a)

of the Securities Exchange Act of 1934

Filed by the Registrant    x

Filed by a Party other than the Registrant    ¨

Check the appropriate box:

 

¨        Preliminary Proxy Statement.

 

¨        Definitive Proxy Statement.

 

x       Definitive Additional Materials.

 

¨        Soliciting Materials Pursuant to Rule 14a-12.

 

¨        Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)).

ALTERA CORPORATION

(Name of Registrant as Specified in Its Charter)

(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 Rules 14a-6(i)(1) and 0-11.

 

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  (2) Aggregate number of securities to which transaction applies:

 

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

 

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  ¨ 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:

 

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LOGO

 

Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to be held on 5/13/08.

This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting.

The following materials are available for view:

Notice and Proxy Statement / Form 10K / Letter to Shareholders

To view this material, have the 12-digit Control #(s) available and visit: www.proxyvote.com

If you want to receive a paper or e-mail copy of the above listed documents you must request one. There is no charge to you for requesting a copy. To facilitate timely delivery please make the request as instructed below on or before 4/23/08.

To request material: Internet: www.proxyvote.com Telephone: 1-800-579-1639 **Email: sendmaterial@proxyvote.com

**If requesting material by e-mail please send a blank e-mail with the 12-digit Control# (located on the following page) in the subject line.

Requests, instructions and other inquiries will NOT be forwarded to your investment advisor.

ALTERA CORPORATION

Vote In Person

Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the Meeting you will need to request a ballot to vote these shares.

Vote By Internet

To vote now by Internet, go to WWW.PROXYVOTE.COM.

Use the Internet to transmit your voting instructions and for electronic delivery of information up until 11:59 P.M. Eastern Time the day before the cut-off date or meeting date. Have your notice in hand when you access the web site and follow the instructions.

Meeting Location

The Annual Meeting of ALTERA CORPORATION for shareholders as of 3/14/08 is to be held on 5/13/08 at 4:00 p.m. local time

at: 101 Innovation Drive

San Jose, CA 95134


LOGO

 

Voting items

THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR ITEMS 1, 2, 3, 4 AND 5.

1. Election of directors.

Nominees:

1a. John P. Daane

1b. Robert J. Finocchio, Jr.

1c. Kevin McGarity

1d. Gregory E. Myers

1e. John Shoemaker

1f. Susan Wang

2. To approve an amendment to the 2005 Equity Incentive Plan to increase by 5,000,000 the number of shares of common stock reserved for issuance under the plan.

3. To approve a second amendment to the 2005 Equity Incentive Plan regarding non-employee director equity awards.

4. To approve an amendment to the 1987 Employee Stock Purchase Plan to increase by 1,000,000 the number of shares of common stock reserved for issuance under the plan.

5. To ratify the appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the fiscal year ending December 26, 2008.

6. To transact such other business as may properly come before the meeting or any postponement or adjournment of the meeting.