UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.     )

Filed by the Registrant  x                             Filed by a Party other than the Registrant  ¨

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¨ Preliminary Proxy Statement

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

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material Pursuant to §240.14a-12

ALTERA CORPORATION

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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*** Exercise Your Right to Vote ***
Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on May 13, 2014.
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ALTERA CORPORATION
ALTERA CORPORATION
101 INNOVATION DRIVE
SAN JOSE, CA 95134
Meeting Information
Meeting Type: Annual Meeting
For holders as of: March 14, 2014
Date: May 13, 2014 Time: 2:30 P.M., Pacific Time
Location: 101 Innovation Drive
San Jose, California 95134
You are receiving this communication because you hold shares in the company named above.
This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side).
We encourage you to access and review all of the important information contained in the proxy materials before voting.
See the reverse side of this notice to obtain proxy materials and voting instructions.

— Before You Vote —
How to Access the Proxy Materials
Proxy Materials Available to VIEW or RECEIVE:
NOTICE AND PROXY STATEMENT ANNUAL REPORT
How to View Online:
Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX (located on the following page) and visit: www.proxyvote.com.
How to Request and Receive a PAPER or E-MAIL Copy:
If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:
1) BY INTERNET: www.proxyvote.com
2) BY TELEPHONE: 1-800-579-1639
3) BY E-MAIL*: sendmaterial@proxyvote.com
* If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow XXXX XXXX XXXX (located on the following page) in the subject line.
Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before April 29, 2014 to facilitate timely delivery.
— How To Vote —
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Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX (located on the following page) available and follow the instructions.
Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.
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Voting Items
THE BOARD OF DIRECTORS RECOMMENDS A VOTE FOR THE ELECTION OF ALL NOMINEES UNDER PROPOSAL 1, FOR PROPOSALS 2, 3, 4 AND 5 AND AGAINST PROPOSAL 6.
1. ELECTION OF DIRECTORS
Nominees:
1a. John P. Daane
1b. T. Michael Nevens
1c. A. Blaine Bowman
1d. Elisha W. Finney
1e. Kevin McGarity
1f. Krish A. Prabhu
1g. Shane V. Robison
1h. John Shoemaker
1i. Thomas H. Waechter
2. To approve an amendment to the 2005 Equity Incentive Plan to (i) extend the term of the plan, (ii) increase by 3,000,000 the number of shares of common stock reserved for issuance under the plan and (iii) make certain other changes as described in more detail in the proxy statement.
3. 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.
4. To approve, on an advisory basis, named executive officer compensation.
5. To ratify the appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2014.
6. If properly presented at the annual meeting, to consider a stockholder proposal regarding an independent chair of the board.
NOTE: Such other business as may properly come before the
meeting or any postponement or adjournment thereof.
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