UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

(RULE 14a-101)

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.    )

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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

National Instruments 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

Shareholder Meeting to Be Held on May 10, 2016

NATIONAL INSTRUMENTS CORPORATION		Meeting Information
		Meeting Type: Annual Meeting
		For holders as of:   March 11, 2016
		Date:  May 10, 2016	Time: 09:00 AM CDT
		Location: National Instruments Corporation      Principal Executive Offices      11500 North Mopac Expressway      Building C      Austin, Texas 78759
	NATIONAL INSTRUMENTS CORPORATION 11500 NORTH MOPAC EXPRESSWAY AUSTIN, TX 78759	You are receiving this communication because you hold shares in the above named company.
		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:
	1. Notice & Proxy Statement            2. Annual Report and Form 10-K
	How to View Online:
	Have the information that is printed in the box marked by the arrow (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 (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 26, 2016 to facilitate timely delivery.
	— How To Vote — Please Choose One of the Following Voting Methods
	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. Have the information that is printed in the box marked by the arrow 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.

Voting Items

The Board of Directors recommends you vote
FOR the following:
1.	Election  of  Directors
	Nominees
01	Dr. James J. Truchard      02   John M. Berra
The Board of Directors recommends you vote FOR the following proposal 2:
2.	To ratify the appointment of Ernst & Young LLP as National Instruments Corporation’s independent registered public accounting firm for the fiscal year ending December 31, 2016.
NOTE:  Such other business as may properly come before the meeting or any adjournment thereof.