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

Securities Exchange Act of 1934 (Amendment

(Amendment No.    )

Filed by the Registrant  x

Filed by a Party other than the Registrant  ¨

Check the appropriate box:

National Instruments 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):

NATIONAL INSTRUMENTS CORPORATION

Notice of Annual Meeting of Stockholders

May 14, 201313, 2014

TO THE STOCKHOLDERS:

NOTICE IS HEREBY GIVEN that the 20132014 Annual Meeting of Stockholders (the “Annual Meeting”) of National Instruments Corporation, a Delaware corporation (“NI”), will be held on May 14, 2013,13, 2014, at 9:00 a.m. local time, at NI’s principal executive offices located at 11500 North Mopac Expressway, Building C, Austin, Texas 78759 for the following purposes as more fully described in the Proxy Statement accompanying this Notice:

1.     To elect each of Mr. Jeffrey L. Kodosky, Dr. James J. TruchardDonald M. Carlton and Mr. John M. BerraMichael E. McGrath to the Board of Directors for a term of three years.

2.     To approve an amendment of NI’s Certificate of Incorporation to increase the authorized number of shares of Commonreserved under NI’s 1994 Employee Stock Purchase Plan by 180,000,000.3,000,000 shares.

3.     To ratify the appointment of Ernst & Young LLP as NI’s independent registered public accounting firm for the fiscal year ending December 31, 2013.2014.

4.     To consider and approve an advisory (non-binding) proposal concerning our executive compensation program.

5.     To transact such other business as may properly come before the meeting or any adjournment thereof.

Only stockholders of record at the close of business on March 15, 2013,14, 2014, are entitled to receive notice of and to vote at the meeting.

All stockholders are cordially invited to attend the Annual Meeting in person. However, whether or not you plan to attend the Annual Meeting, we hope that you will vote as soon as possible. You may vote on the Internet or by telephone by following the instructions provided in the Notice of Internet Availability of Proxy Materials you received in the mail. If you received a paper copy of a proxy card by mail in response to your request for a hard copy of the proxy materials for the Annual Meeting, you may also vote by Internet, telephone, or by completing, signing and dating your proxy card and mailing it in the postage-prepaid envelope enclosed for that purpose, in each case by following the instructions on the proxy card. Voting over the Internet, by telephone or by written proxy will ensure your representation at the Annual Meeting, if you do not attend in person. For specific instructions on how to vote your shares, please review the instructions on the Notice of Internet Availability of Proxy Materials you received in the mail or the proxy card if you received a paper copy of the proxy materials.

Stockholders attending the Annual Meeting may vote in person even if they have submitted a proxy. However, if you have submitted a proxy and wish to vote at the Annual Meeting, you must notify the inspector of elections of your intention to revoke the proxy you previously submitted and instead vote in person at the Annual Meeting. If your shares are held in the name of a broker, trustee, bank or other nominee, please bring a proxy from the broker, trustee, bank or other nominee with you to confirm you are entitled to vote the shares.

Sincerely,

/s/ David G. Hugley

Secretary

Austin, Texas

April 1, 20132014

NATIONAL INSTRUMENTS CORPORATION

PROXY STATEMENT

INFORMATION CONCERNING SOLICITATION AND VOTING

General

The Board of Directors (the “Board”) of National Instruments Corporation, a Delaware corporation (“NI”), has made proxy materials available to you on the Internet or, upon your request, has delivered printed versions of proxy materials to you by mail, in connection with the Board’s solicitation of proxies for use at NI’s 20132014 Annual Meeting of Stockholders (the “Annual Meeting”) to be held on May 14, 2013,13, 2014, at 9:00 a.m., local time, or at any adjournments or postponements thereof, for the purposes set forth in this Proxy Statement and in the accompanying Notice of Annual Meeting of Stockholders. The Annual Meeting will be held at NI’s principal executive offices at 11500 North Mopac Expressway, Building C, Austin, Texas 78759. NI’s telephone number is (512) 338-9119.

Under rules adopted by the U.S. Securities and Exchange Commission (the “SEC”), NI is now furnishing proxy materials to NI’s stockholders on the Internet, rather than mailing printed copies of those materials to each stockholder. If you received a Notice of Internet Availability of Proxy Materials by mail, you will not receive a printed copy of the proxy materials unless you request one. Instead, the Notice of Internet Availability of Proxy Materials will instruct you as to how you may access and review the proxy materials on the Internet. If you received a Notice of Internet Availability of Proxy Materials by mail and would like to receive a printed copy of our proxy materials, please follow the instructions included in the Notice of Internet Availability of Proxy Materials. We anticipate that the Notice of Internet Availability of Proxy Materials will be mailed to stockholders on or about April 1, 2013.2014.

Householding of Annual Meeting Materials

Some brokers and other nominee record holders may be participating in the practice of “householding” notices of Internet availability of proxy materials, proxy statements and annual reports. This means that only one (1) copy of the Notice of Internet Availability of Proxy Materials may have been sent to multiple stockholders in a stockholder’s household. We will promptly deliver a separate copy of any of these documents to any stockholder who contacts our investor relations department at 11500 North Mopac Expressway, Austin, Texas 78759-3504, (512) 683-5090, requesting such copies. If a stockholder is receiving multiple copies of the Notice of Internet Availability of Proxy Materials or the printed versions of such other accounts at the stockholder’s household and would like to receive a single copy of these documents for a stockholder’s household in the future, stockholders should contact their broker, other nominee record holder, or our investor relations department to request mailing of a single copy of any of these documents.

Record Date; Outstanding Shares

Stockholders of record at the close of business on March 15, 201314, 2014 (the “Record Date”) are entitled to receive notice of and vote at the Annual Meeting. On the Record Date, 123,502,067126,091,842 shares of NI’s common stock, $0.01 par value, were issued and outstanding.

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Voting and Solicitation

Every stockholder of record on the Record Date is entitled, for each share held, to one vote on each proposal that comes before the Annual Meeting. In the election of directors in Proposal One, each stockholder will be entitled to vote for twothree nominees and the twothree nominees with the greatest number of votes will be elected. Beginning with the Annual Meeting,However, any nominee for director in an uncontested election who receives a greater number of votes “withheld” from his or her election than votes “for” such election shall promptly tender his or her resignation following certification of the stockholder vote. See “Proposal One: Election of Directors—Vote Required; Recommendation of Board of Directors” for additional information on these guidelines.

The affirmative vote of the holders of a majority of the shares of Common Stock issued and outstanding on the Record Date will be required to approve Proposal Two. The affirmative vote of a majority of the votes cast on the proposal at the Annual Meeting will be required to approve Proposal Three.each of Proposals Two, Three and Four.

Whether you hold shares directly as the stockholder of record or beneficially in street name, you may vote on the Internet, by telephone or, if you received a paper copy of the proxy materials, by completing, signing and mailing the proxy card enclosed therewith in the postage-prepaid envelope provided for that purpose. Voting over the Internet, by telephone or by written proxy will ensure your representation at the Annual Meeting, if you do not attend in person. For specific instructions on how to vote your shares, please review the instructions on the Notice of Internet Availability of Proxy Materials you received in the mail or the proxy card if you received a paper copy of the proxy materials.

The cost of this solicitation will be borne by NI. NI may reimburse expenses incurred by brokerage firms and other persons representing beneficial owners of shares in forwarding solicitation materials to beneficial owners. Proxies may be solicited by certain of NI’s directors, officers and other employees, without additional compensation, personally, by telephone or by email.

Treatment of Abstentions and Broker Non-Votes

Abstentions will be counted for purposes of determining (i) either the presence or absence of a quorum for the transaction of business and (ii) the total number of votes cast with respect to a proposal (other than the election of directors). Accordingly, abstentions will have no effect on the election of directors in Proposal One and will have the effect of a vote against Proposals Two and Three.One.

While broker non-votes will be counted for purposes of determining the presence or absence of a quorum for the transaction of business, broker non-votes will not be counted for purposes of determining the number of votes cast with respect to the particular proposal on which the broker has expressly not voted. Thus, broker non-votes will not affect the outcome of the voting on Proposals One, Two, Three or Three and will have the effect of a vote against Proposal Two.Four.

A broker will vote your shares only if the proposal is a matter on which your broker has discretion to vote (such as the ratification of our independent registered public accounting firm in Proposal Three), or if you provide instructions on how to vote by following the instructions provided to you by your broker.

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Revocability of Proxies

Proxies given pursuant to this solicitation may be revoked at any time before they have been used. You may change or revoke your proxy by entering a new vote by Internet or by telephone or by

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delivering a written notice of revocation to the Secretary of NI or by completing a new proxy card bearing a later date (which automatically revokes the earlier proxy instructions). Attendance at the Annual Meeting will not cause your previously granted proxy to be revoked unless you specifically so request by notifying the inspector of elections of your intention to revoke your proxy and voting in person at the Annual Meeting.

DEADLINE FOR RECEIPT OF STOCKHOLDER PROPOSALS

Stockholders of NI may submit proper proposals for inclusion in NI’s Proxy Statement and for consideration at the annual meeting of stockholders to be held in 20142015 by submitting their proposals in writing to the Secretary of NI in a timely manner. In order to be considered for inclusion in NI’s proxy materials for the annual meeting of stockholders to be held in 2014,2015, stockholder proposals must be received by the Secretary of NI no later than December 2, 2013,2014, and must otherwise comply with the requirements of Rule 14a-8 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

In addition, NI’s bylaws establish an advance notice procedure with regard to business to be brought before an annual meeting, including stockholder proposals not included in NI’s Proxy Statement. For director nominations or other business to be properly brought before NI’s 20142015 annual meeting by a stockholder, such stockholder must deliver written notice to the Secretary of NI at NI’s principal executive office no later than January 31, 20142015 and no earlier than January 1, 2014.2015. If the date of NI’s 20142015 annual meeting is advanced or delayed by more than 30 calendar days from the first anniversary date of the 20132014 Annual Meeting, your notice of a proposal will be timely if it is received by NI by the close of business on the tenth day following the day NI publicly announces the date of the 20142015 annual meeting.

The proxy grants the proxy holders discretionary authority to vote on any matter raised at the Annual Meeting. If a stockholder fails to comply with the foregoing notice provisions, proxy holders will be allowed to use their discretionary voting authority on such matter should the stockholder proposal come before the 20142015 annual meeting.

A copy of the full text of the bylaw provisions governing the notice requirements set forth above may be obtained by writing to the Secretary of NI. All notices of proposals and director nominations by stockholders should be sent to National Instruments Corporation, 11500 North Mopac Expressway, Building C, Austin, Texas 78759, Attention: Corporate Secretary.

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PROPOSAL ONE:

ELECTION OF DIRECTORS

General

NI’s Board of Directors is divided into three classes, with the term of the office of one class expiring each year. The authorized number of directors which constitutes the entire Board of Directors is currently seven, with two directors in Class I, three directors in Class II, and two directors in Class III. The terms of office of Class I directors Dr. James J. Truchard and Mr. John M. Berra will expire at the Annual Meeting. Dr. Truchard and Mr. Berra will stand for re-election to the Board of Directors at the Annual Meeting.

The terms of office of Class II directors Mr. Jeffrey L. Kodosky, Dr. Donald M. Carlton and Mr. John K. Medica will expire at the 2014 annual meeting.Annual Meeting. NI’s Board of Directors has nominated Mr. Kodosky, Dr. Carlton and Mr. Michael E. McGrath for election as Class II directors at the Annual Meeting. The terms of office of Class III directors Ms. Duy-Loan T. Le and Mr. Charles J. Roesslein will expire at the 2015 annual meeting. The terms of office of Class I directors Dr. James J. Truchard and Mr. John M. Berra will expire at the 2016 annual meeting.

Under the listing requirements of the Nasdaq Stock Market, a majority of the Board of Directors must be comprised of independent directors. The Board of Directors has determined that each of Mr. Berra, Dr. Carlton, Ms. Le, Mr. MedicaMcGrath and Mr. Roesslein is independent under applicable Nasdaq listing standards and Rule 10A-3 of the Securities Exchange Act of 1934.

Vote Required; Recommendation of Board of Directors

The nominees receiving the highest number of affirmative votes of the shares present in person or represented by proxy at the Annual Meeting and entitled to vote in the election of directors shall be elected to the Board of Directors. Votes withheld from any director are counted for purposes of determining the presence or absence of a quorum, but have no legal effect under Delaware law. Cumulative voting is not permitted by NI’s Certificate of Incorporation.

Beginning with the Annual Meeting,Under NI’s Corporate Governance Guidelines, any nominee for director in an uncontested election (i.e., an election where the only nominees are those recommended by the Board) who receives a greater number of votes “withheld” from his or her election than votes “for” such election shall promptly tender his or her resignation following certification of the stockholder vote.

TheIn such event, the Nomination and Governance Committee will promptly consider the tendered resignation and will recommend to the Board whether to accept the tendered resignation or to take some other action, such as rejecting the tendered resignation and addressing the apparent underlying causes of the “withheld” votes. In making this recommendation, the Nomination and Governance Committee will consider all factors deemed relevant by its members including, without limitation, the underlying reasons why stockholders “withheld” votes for election from such director (if ascertainable), the length of service and qualifications of the director whose resignation has been tendered, the director’s contributions to NI, whether by accepting such resignation NI will no longer be in compliance with any applicable law, rule, regulation or governing document, and whether or not accepting the resignation is in the best interests of NI and its stockholders.

The Board will promptly act on the Nomination and Governance Committee’s recommendation no later than 90 days following its receipt of such recommendation. In considering

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the Nomination and Governance Committee’s recommendation, the Board will consider the factors considered by the Nomination and Governance Committee and such additional information and factors the Board believes to be relevant.

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Unless otherwise instructed, the proxy holders will vote the proxies received by them for NI’s nominees named below. If any nominee of NI is unable or declines to serve as a director at the time of the Annual Meeting, the proxies will be voted for any nominee who is designated by the present Board of Directors to fill the vacancy. It is not expected that any nominee will be unable or will decline to serve as a director.

THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS A VOTE “FOR” THE NOMINEES LISTED BELOW.

Nominees for Election at the Annual Meeting

The Nomination and Governance Committee, consisting solely of independent directors as determined under applicable Nasdaq listing standards, recommended the twothree individuals set forth in the table below for nomination by our full Board of Directors. Based on such recommendation, our Board of Directors nominated such directors for election at the Annual Meeting. The following sets forth information concerning the nominees for election as directors at the Annual Meeting, including information as to each nominee’s age as of the Record Date, current principal occupation and business experience.

James J. Truchard, PhDco-founded NI in 1976 and has served as its Chief Executive Officer, President and Chairman of the Board of Directors since inception. From 1963 to 1976, Dr. Truchard worked at the Acoustical Measurements Division at Applied Research Laboratories (“ARL”) at the University of Texas at Austin (“UT Austin”), as Research Scientist and later Division Head. Dr. Truchard received his PhD in Electrical Engineering, his master’s degree in Physics and his bachelor’s degree in Physics, all from UT Austin.

The Board concluded that Dr. Truchard should serve as a director since he is a founder and large stockholder of NI and has pioneered the development of virtual instrumentation software and hardware. Further, the Board recognizes that under Dr. Truchard’s leadership as a Board member and as CEO, he has inspired innovation, growth, and expansion over a period of over 30 years to make NI a highly successful, worldwide enterprise while maintaining an entrepreneurial spirit.

John M. Berra has been a member of NI’s Board of Directors since May 2010. From October 2008 through September 2010, Mr. Berra served as Chairman of Emerson Process Management, a global leader in providing solutions to customers in process control, and as Executive Vice President of Emerson Electric Company. From 1997 until 2008, he served as President of Emerson Process Management. Mr. Berra has diversified experience in global business, strategic planning, technology, organizational planning and acquisitions. Mr. Berra joined Emerson’s Rosemount division as a

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marketing manager in 1976 and, thereafter, continued assuming more prominent roles in the organization until 1997, when he was named President of Emerson’s Fisher-Rosemount division (now Emerson Process Management). Prior to joining Emerson, Mr. Berra was an instrument and electrical engineer with Monsanto Company. Mr. Berra is currently a director of Ryder System, Inc., and serves as a member of that company’s compensation committee, and as a member of its finance committee.

The Board concluded that Mr. Berra should serve as a director due to his significant executive level experience at leading corporations Emerson and Monsanto. In particular, as President of Emerson Process Management, he was chief executive of a $6.7-billion dollar global corporation. He has extensive experience growing large accounts and broad based sales and marketing experience concentrated in a number of markets. He also has extensive experience in hardware development of measurement products and control systems and software dealing with PC software and embedded applications.

INCUMBENT DIRECTORS WHOSE TERMS OF OFFICE

CONTINUE AFTER THE ANNUAL MEETING

The following sets forth information concerning the directors whose terms of office continue after the Annual Meeting, including information as to each director’s age as of the Record Date, current principal occupation and business experience.

Jeffrey L. Kodosky co-founded NI in 1976 and has been a member of NI’s Board of Directors since that time. He was appointed Vice President of NI in 1978 and served as Vice President, Research and Development from 1980 to 2000. Since 2000, he has held the position of Business and Technology Fellow. Prior to 1976, he was employed at ARL, Applied Research Laboratories (“ARL”), at the University of Texas at Austin (“UT Austin.Austin”). Mr. Kodosky received his bachelor’s degree in Physics from Rensselaer Polytechnic Institute.

The Board concluded that Mr. Kodosky should be nominated and serve as a director since he is a founder of NI, a highly respected mentor in the NI global R&D organization and he continues to chart new directions for NI’s flagship product, LabVIEW. Mr. Kodosky has developed more than 30 patented LabVIEW technologies and his ongoing work has helped NI grow this software into an award-winning industry programming environment that addresses a variety of industries and application areas.

Donald M. Carlton, PhD, has been a member of NI’s Board of Directors since 1994. From February 1996 until December 1998, Dr. Carlton served as the President and Chief Executive Officer of Radian International LLC, and from 1969 until January 1996, Dr. Carlton served as President and

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Chairman of the Board of Radian Corporation, both of which are environmental engineering firms.

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Dr. Carlton received his bachelor’s degree in Chemistry from the University of St. Thomas and his PhD in Chemistry from UT Austin. Dr. Carlton is a former director of American Electric Power and Temple-Inland, Inc., publicly traded companies.

The Board concluded that Dr. Carlton should be nominated and serve as a director since he has a broad background as an executive and has significant experience in sales which is key to NI. He also has experience in the development of large accounts, marketing strategies, chemical process development, supply chain and inventory management, accounting and compliance with SEC matters, all of which skills the Board believes are important to have represented on the NI Board.

Michael E. McGrath is a highly experienced executive, entrepreneur and bestselling author dealing with decision making techniques and processes. He is a frequent featured guest on business television segments and his advice has appeared in many publications. He served as a director of i2 Technologies, a supply chain management and software services company, from September 2004 to May 2008, and as its CEO and President from February 2005 to July 2007. He served on the board of directors of Entrust, Inc., from February 2007, and as Chairman of the Board starting in November 2008, until the company was sold in July 2009. He served as executive chairman of the board of The Thomas Group from February 2008 to March 2012, and as acting CEO for a period of time. The Thomas Group filed for bankruptcy protection in March 2012. He also served on the board of Sensable Technologies from 2000 until 2009 and currently serves on the board of Revolution Analytics. He was a founder and the Chief Executive Officer of Pittiglio Rabin Todd & McGrath, a management consulting firm, for 28 years, retiring from the firm in July 2004. Mr. McGrath is the author of Product Strategy for High-Technology Companies, Next Generation Product Development, Business Decisions, and other books. Mr. McGrath received his bachelor’s degree in Computer Science from Boston College, and his master’s degree in Business Administration from Harvard Business School.

The Board concluded that Mr. McGrath should be nominated and serve as a director since he has an extensive background in product development strategy, strategic product marketing, and software services. Having served as CEO of i2 Technologies, a vendor of supply chain management software, he has knowledge of software systems, experience selling into corporate opportunities, and experience developing large accounts. In particular, he has experience with management functions including software marketing and sales force management activities, and software development. He is an experienced consultant and author with knowledge of cloud computing and smartmobile applications, which are relevant for NI’s business.

INCUMBENT DIRECTORS WHOSE TERMS OF OFFICE CONTINUE AFTER THE ANNUAL MEETING

The following sets forth information concerning the directors whose terms of office continue after the Annual Meeting, including information as to each director’s age as of the Record Date, current principal occupation and business experience.

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Charles J. Roesslein has been a member of NI’s Board of Directors since July 2000. Since 2004, Mr. Roesslein has been Chief Executive Officer of Austin Tele-Services, LLC, which is in the secondary market for telecom and IT assets. During 2000, Mr. Roesslein served as the Chairman of the Board of Directors and President of Prodigy Communications Corporation, an internet service provider. He served as President of SBC-CATV, a cable television service provider, from 1999 until 2000, and as President of SBC Technology Resources, the applied research division of SBC Communications Inc., from 1997 until 1999. Prior to 1997, Mr. Roesslein served in executive officer positions with SBC Communications, Inc. and Southwestern Bell. Mr. Roesslein holds a bachelor’s degree in Mechanical Engineering from the University of Missouri-Columbia and a master’s degree in Finance from the University of Missouri-Kansas City. Mr. Roesslein is currently a director of Atlantic Tele-Network, Inc., a publicly traded company.

The Board concluded that Mr. Roesslein should be nominated and serve as a director since he brings a wealth of financial and executive experience to the Board including extensive experience in the development of large accounts while serving Southwestern Bell Corporation’s customers. He also has a strong financial background having served as Vice President and Chief Financial Officer of Southwestern Bell Publications and as Vice President and Chief Financial Officer of Southwestern Bell Telephone Company. Mr. Roesslein has an extensive high level background in the telecom industry and in telecom technologies.

Duy-Loan T. Le has been a member of NI’s Board of Directors since September 2002. During her continuing 30-year31-year career at Texas Instruments, Inc. (“TI”), in 2002, Ms. Le became the first woman at TI elected to the rank of Senior Fellow. Prior to this role, she held leadership positions throughout TI. Since 2000, she has been Digital Signal Processor (DSP) Advanced Technology Ramp Manager at TI, with responsibilities which include assisting with product execution on advanced technology nodes such as 180nm, 130nm, 90nm, 65nm, 40nm, and 28nm. Ms. Le is currently the Embedded Processing (EP) RaysRAMP Manager, responsible for technology readiness and product execution for TI’s multibillion-dollar digital business. Ms. Le has been awarded 24 patents and has 7 pending applications. She holds a bachelor’s degree in Electrical Engineering from the UT Austin and a master’s degree in Business Administration from the University of Houston.

The Board concluded that Ms. Le should be nominated and serve as a director since she has extensive experience managing platform-based product development. At TI, she oversees the definition of technology requirements, leads technology qualifications with the development teams, and directs execution to achieve functionality, performance, power, yield, quality, reliability and capacity goals to enable successful product launch and ramp. She has managed global R&D centers for TI; these teams span multiple countries, disciplines, businesses, and organizations across TI. She has over 20 years of process manufacturing experience. These skills and knowledge are relevant for NI’s business.

James J. Truchard, PhDco-founded NI in 1976 and has served as its Chief Executive Officer, President and Chairman of the Board of Directors since inception. From 1963 to 1976, Dr. Truchard worked at the Acoustical Measurements Division at ARL at UT Austin, as Research Scientist and later Division Head. Dr. Truchard received his PhD in Electrical Engineering, his master’s degree in Physics and his bachelor’s degree in Physics, all from UT Austin.

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The Board concluded that Dr. Truchard should serve as a director since he is a founder and large stockholder of NI and has pioneered the development of virtual instrumentation software and hardware. Further, the Board recognizes that under Dr. Truchard’s leadership as a Board member and as CEO, he has inspired innovation, growth, and expansion over a period of over 30 years to make NI a highly successful, worldwide enterprise while maintaining an entrepreneurial spirit.

John K. MedicaM. Berra has been a member of NI’s Board of Directors since 2008. He retiredMay 2010. From October 2008 through September 2010, Mr. Berra served as SeniorChairman of Emerson Process Management, a global leader in providing solutions to customers in process control, and as Executive Vice President and Co-Leader, Product Group from Dell Inc. in April 2007. In 1993, Mr. Medica joined Dell as Vice President, Portable Systems. During 1996,of Emerson Electric Company. From 1997 until 2008, he served as President of Emerson Process Management. Mr. Berra has diversified experience in global business, strategic planning, technology, organizational planning and Chief Operating Officeracquisitions. Mr. Berra joined Emerson’s Rosemount division as a marketing manager in 1976 and, thereafter, continued assuming more prominent roles in the organization until 1997, when he was named President of Dell’s Japan division. He returned to the U.S. in August 1997 as Vice President, Procurement, and later served as Vice President, Web Products Group, and Vice President and General Manager, Transactional Product Group.Emerson’s Fisher-Rosemount division (now Emerson Process Management). Prior to joining Dell, he served as Project Leader for the Macintosh II, Director of the Macintosh CPU Projects GroupEmerson, Mr. Berra was an instrument and Senior Director of PowerBook Engineeringelectrical engineer with Apple Inc.Monsanto Company. Mr. Medica received his bachelor’s degree in Electrical Engineering from Manhattan College, and his master’s degree in Business Administration from Wake Forest University. Mr. MedicaBerra is currently a director of Compal Electronics,Ryder System, Inc., and serves as a publicly traded company.member of that company’s compensation committee, and as a member of its finance committee.

The Board concluded that Mr. MedicaBerra should serve as a director since he has an extensive background with global sales management matters having managed Dell’s Japanese based global accounts.due to his significant executive level experience at leading corporations Emerson and Monsanto. In particular, as President of Emerson Process Management, he was chief executive of a $6.7 billion dollar global corporation. He has extensive experience with consumer, small business, corporate,growing large accounts and governmental accounts. He is also experiencedbroad based sales and marketing experience concentrated in a rangenumber of other management functions including marketingmarkets. He also has extensive experience in hardware development of measurement products and sales force management activities, hardwarecontrol systems and software development, new product operations, supply chain management, manufacturing facilitiesdealing with PC software and human resources through developing executive talent management programs.embedded applications.

There is no family relationship between any director, director nominee or officer of NI.

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SECURITY OWNERSHIP

The following table sets forth the beneficial ownership of NI’s common stock as of the Record Date (i) by all persons known to NI, based on statements filed by such persons pursuant to Section 13(d) or 13(g) of the Exchange Act, to be the beneficial owners of more than 5% of NI’s common stock, (ii) by each of the executive officers named in the Summary Compensation Table under “Executive Compensation,” (iii) by each director and director nominee, and (iv) by all current directors and executive officers as a group:

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CORPORATE GOVERNANCE

Board Meetings and Committees

The Board of Directors of NI held a total of six meetings during 2012.2013. The Board of Directors has a standing Audit Committee, Compensation Committee, and Nomination and Governance Committee.

No director attended fewer than 75% of the total number of meetings of the Board of Directors and the total number of meetings held by all committees of the Board of Directors on which he or she served. NI encourages, but does not require, its board members to attend NI’s annual meeting. In 2012,2013, all directors, with the exception of Dr. Carlton, Ms. Le and Mr. Medica, attended NI’s annual meeting.

Board Leadership Structure

The Board of Directors believes that NI’s Chief Executive Officer, Dr. Truchard, is best situated to serve as Chairman because he is the director most familiar with NI’s business and industry, and most capable of effectively identifying strategic priorities and leading the discussion and execution of strategy. Dr. Truchard is also a founder of NI and NI’s largest stockholder. The Board’s independent directors and management directors have different perspectives and roles in strategic development. NI’s independent directors bring experience, oversight and expertise from outside the company and industry, while the Chief Executive Officer and the other management director bring company-specific experience and expertise. The Board of Directors believes that the combined role of Chairman and Chief Executive Officer promotes strategy development and execution, and facilitates information flow between management and the Board of Directors, which are essential to effective governance. NI does not have a lead independent director.

The NI Board oversees risk management in a number of ways. The Audit Committee oversees the management of financial and accounting related risks as an integral part of its duties. Similarly, the Compensation Committee considers risk management when setting the compensation policies and programs for NI’s executive officers and other employees. The full Board of Directors receives reports on various risk related items at each of its regular meetings including risks related to NI manufacturing operations, intellectual property, taxes, products and employees. The Board also receives periodic reports on NI’s efforts to manage such risks through safety measures, insurance or self-insurance.

Communications to the Board of Directors

Stockholders may communicate with members of the Board of Directors by mail addressed to the Chairman, any other individual member of the Board, to the full Board, or to a particular committee of the Board. In each case, such correspondence should be sent to the following address: 11500 North Mopac Expressway, Building C, Austin, Texas 78759, Attention: Corporate Secretary. Correspondence received that is addressed to the members of the Board of the Directors will be reviewed by NI’s General Counsel or his designee, who will forward such correspondence to the appropriate members of the Board of the Directors.

Audit Committee

The Audit Committee, which currently consists of directors Donald M. Carlton, Charles J. Roesslein, and John M. Berra, met six times during 2012.2013. The Audit Committee appoints, compensates, retains and oversees the engagement of NI’s independent registered public accounting

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firm, reviews with such independent registered public accounting firm the plan, scope and results of their examination of NI’s consolidated financial statements and reviews the independence of such independent registered public accounting firm. The Audit Committee inquires about any significant risks or exposures and assesses the steps management has taken to minimize such risks to NI, including the adequacy of insurance coverage and the strategy for management of foreign currency risk. The Audit Committee also reviews NI’s compliance with matters relating to environmental, Equal Employment Opportunity Commission, export and SEC regulations. The Audit Committee has established procedures for the receipt, retention and treatment of complaints received by NI regarding accounting, internal accounting controls or auditing matters and for NI employees to submit concerns regarding such matters on a confidential and anonymous basis. The Board of Directors believes that each member of the Audit Committee is an “independent director” as that term is defined by the Nasdaq listing standards and Rule 10A-3 of the Securities Exchange Act of 1934. The Board of Directors has determined that each of Dr. Carlton and Mr. Roesslein is an “audit committee financial expert” within the meaning of SEC rules. The charter of the Audit Committee is available on NI’s website at

http://www.ni.com/nati/corporategovernance/composition_charters.htm.

Nomination and Governance Committee

The Nomination and Governance Committee, which currently consists of directors Charles J. Roesslein, Donald M. Carlton, and John M. Berra, each of whom is deemed to be an “independent director” as that term is defined by the Nasdaq listing standards, met four times during 2012.2013. The Nomination and Governance Committee recommends to the Board of Directors the selection criteria for board members, compensation of outside directors, appointment of board committee members and committee chairpersons, and develops board governance principles. The Nomination and Governance Committee will consider nominees recommended by stockholders provided such recommendations are made in accordance with procedures described in this Proxy Statement under “Deadline for Receipt of Stockholder Proposals.” When considering a potential director candidate, the Nomination and Governance Committee looks for demonstrated character, judgment, relevant business, functional and industry experience, and a high degree of acumen. The Nomination and Governance Committee also considers issues of diversity, such as education, professional experience and differences in viewpoints and skills. The Nomination and Governance Committee does not have a formal policy with respect to diversity; however, the Board of Directors and the Nomination and Governance Committee believe that it is important that the members of the Board of Directors represent diverse viewpoints. The Nomination and Governance Committee’s process for identifying and evaluating nominees typically involves a series of internal discussions, review of information concerning candidates and interviews with selected candidates. There are no differences in the manner in which the Nomination and Governance Committee evaluates nominees for director based on whether the nominee is recommended by a stockholder. NI does not pay any third party to identify or assist in identifying or evaluating potential nominees. The charter of the Nomination and Governance Committee is available on NI’s website at

http://www.ni.com/nati/corporategovernance/composition_charters.htm.

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Compensation Committee

The Compensation Committee, which currently consists of directors Duy-Loan T. Le, John M. Berra, and John K. Medica each of whom is deemed to be an “independent director” as that term is

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defined by applicable SEC rules, Nasdaq listing standards and other requirements, met sevensix times during 2012.2013. The charter of the Compensation Committee is available on NI’s website at

http://www.ni.com/nati/corporategovernance/composition_charters.htm.

The Compensation Committee seeks input from NI’s President and Chief Executive Officer, Dr. Truchard, when discussing the performance of, and compensation levels for, executives other than himself. The Compensation Committee also works closely with Dr. Truchard and NI’s vice president of human resources and others as required in evaluating the financial, accounting, tax and retention implications of NI’s various compensation programs. The vice president of human resources regularly attends the meetings of the Compensation Committee and, at such meetings, provides advice on compensation matters to the Compensation Committee. The vice president of human resources also provides guidance to the Compensation Committee concerning compensation matters as they relate to NI’s executive officers. Neither Dr. Truchard, the vice president of human resources, nor any of NI’s other executives participates in deliberations relating to his own compensation.

Under the terms of its charter, the Compensation Committee establishes the compensation of NI’s Chief Executive Officer, evaluates the performance of NI’s executive officers, and establishes the salaries and cash bonus compensation of the executive officers based on recommendations of the Chief Executive Officer. The Compensation Committee also periodically examines NI’s compensation structure to evaluate whether NI is rewarding its officers and other personnel in a manner consistent with sound industry practices and makes recommendations on such matters to NI’s management and Board of Directors. The Compensation Committee also has oversight responsibility for NI’s 2010 Incentive Plan, 2005 Incentive Plan, Employee Stock Purchase Plan and Amended and Restated 1994 Incentive Plan. The Board of Directors may by resolution prescribe additional authority and duties to the Compensation Committee.

The Compensation Committee’s charter does not contain a provision providing for the delegation of its duties to other persons. The Compensation Committee has not delegated any of its authority.

Prior to 2011, NI had not historically utilizedFor a discussion of NI’s utilization of compensation consultants, in determining or recommending the amount or form of executive compensation. As discussed in thesee “Compensation Discussion and Analysis,Analysis.” NI uses survey information and compares its executive compensation levels with those of other technology companies in such survey that NI believes to be comparable in terms of market capitalization and annual revenue. In July 2011, the Compensation Committee engaged Frederic W. Cook & Co. as a compensation consultant to review NI’s overall executive compensation structure and to perform an analysis and assessment of NI’s compensation processes, methodologies and practices to evaluate their effectiveness and alignment with NI’s compensation philosophy and objectives.

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COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

The members of the Compensation Committee are set forth in the “Compensation Committee” section and do not include any NI executive officers. During 2012,2013, no NI executive officer served on the compensation committee (or equivalent), or the board of directors, of another entity whose executive officer(s) served on NI’s Compensation Committee. During 2012,2013, no NI executive officer served on the compensation committee (or equivalent) of another entity whose executive officer(s) served as a member of the NI Board of Directors.

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

Transactions with Related Persons

NI had no related party transactions within the meaning ofrequiring disclosure under applicable SEC rules for the year ended December 31, 2012.2013.

Policy and Procedures for Review, Approval, or Ratification of Related Party Transactions

Pursuant to its written charter, the Audit Committee is responsible for reviewing NI’s policies relating to the avoidance of conflicts of interests and past or proposed transactions between NI, members of the Board of Directors of NI, and management. NI considers “related person transactions” to mean all transactions involving a “related person,” which under SEC rules means an executive officer, director or a holder of more than five percent of NI’s common stock, including any of their immediate family members and any entity owned or controlled by such persons. The Audit Committee determines whether the related person has a material interest in a transaction and may approve, ratify, rescind or take other action with respect to the transaction in its discretion.

In any transaction involving a related person, NI’s Audit Committee would consider the available material facts and circumstances of the transaction, including: the direct and indirect interests of the related person; the risks, costs and benefits of the transaction to NI; whether any alternative transactions or sources for comparable services or products are available; and, in the event the related person is a director (or immediate family member of a director or an entity with which a director is affiliated), the impact that the transaction will have on such director’s independence.

After considering such facts and circumstances, NI’s Audit Committee determines whether approval, ratification or rescission of the related person transaction is in NI’s best interests. NI’s Audit Committee believes that all employees and directors should be free from conflicting interests and influences of such nature and importance as would make it difficult to meet their applicable fiduciary duties and loyalty to NI, and reviews all related party transactions against the foregoing standard.

NI’s written policies and procedures for review, approval or ratification of transactions that pose a conflict of interest, including related person transactions, are set forth in its Code of Ethics, which contains, among other policies, a conflicts of interest policy for all employees, including NI’s executives, and a conflicts of interest policy for non-employee directors.

Under NI’s written conflicts of interest policy applicable to all employees, including NI’s executives, every employee is required to report to NI’s President any information regarding the existence or likely development of conflicts of interest involving themselves or others within NI. While

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NI provides examples of potential conflicts of interests, such as investments in enterprises that do business with NI, compensation for services to any person or firm which does business with NI, or gifts and loans and entertainment from any person or firm having current or prospective dealings with NI, the policy applicable to employees expressly states that the examples provided are illustrative only and that each employee should report any other circumstance which could be construed to interfere actually or potentially with loyalty to NI. Transactions involving potential conflicts of interests for employees are reviewed by NI’s President, who makes a determination as to whether there exists any conflict of interest or relationship which violates NI’s policies and the appropriate actions to take with respect to such relationship. NI’s General Counsel reports to the Audit Committee the conflict of interest reports received and acted upon by the President. In the event a report was received concerning a potential conflict of the President or a member of the Board of Directors, the Audit Committee would review such matter.

The written conflicts of interest policy applicable to all non-employee directors is substantially similar to the conflicts of interest policy applicable to NI employees, with the exception that every non-employee director is required to report potential conflict of interest situations to the Audit Committee, which is responsible for making the determination as to whether there exists any conflict of interest or relationship which violates such policy. If the Audit Committee determines that a conflict of interest exists, the non-employee director involved will be required to dispose of the conflicting interest to the satisfaction of the Audit Committee.

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BOARD COMPENSATION

Determining Compensation for Non-Employee Directors in 20122013

The Board of Directors, upon the recommendation of the Nomination and Governance Committee, sets non-employee directors’ compensation with the goal of retaining NI’s directors and attracting qualified persons to serve as directors. In developing its recommendations, the Nomination and Governance Committee considers director compensation at comparable publicly-traded companies and aims to structure director compensation in a manner that is transparent and easy for stockholders to understand.

The compensation of non-employee directors for the fiscal year ended December 31, 20122013 is set forth in the table below.

Director Compensation

For Fiscal Year Ended December 31, 20122013

Discussion of Director Compensation

In 2012,2013, the annual compensation for NI’s non-employee directors was comprised of cash compensation in the form of an annual retainer, committee chair retainer and equity compensation in the form of RSUs. Each of these components is described below. An NI employee director does not receive any additional compensation for his service as a director.

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Annual Board/Committee Retainer Fees

Non-employee directors received an annual cash retainer of $60,000 per year, with the Audit Committee Chair being paid an additional $7,500 annual retainer, the Compensation Committee Chair being paid an additional $5,000, and the Nomination and Governance Chair being paid an additional $2,500.

Non-Employee Director Reimbursement Practice

Non-employee directors are reimbursed for travel and other out-of-pocket expenses connected to Board travel.

Restricted Stock Unit Awards

Under NI’s 2010 Incentive Plan, non-employee directors are eligible to receive RSU grants. Specifically, each non-employee director receives an annual grant of RSUs equal to $120,000 divided by the closing price of NI’s common stock on the day immediately preceding the date of grant. Under this program, in 2012,2013, Mr. Carlton, Mr. Roesslein, Ms. Le, Mr. Medica, and Mr. Berra were each granted 4,4793,978 RSUs based on NI’s closing stock price of $26.79$30.17 per share on April 18, 2012.23, 2013. These RSUs vest over a three-year period with one-third of the RSUs vesting on each anniversary of the vesting commencement date, which is May 1 of each year.

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EXECUTIVE OFFICERS

The following table sets forth information concerning the persons serving as executive officers of NI as of the Record Date, including information as to each executive officer’s age, position with NI and business experience. Officers of NI serve at the discretion of the Board.

See “Election of Directors” for additional information with respect to Dr. Truchard.

Alexander M. Davern joined NI in February 1994 and currently serves as Chief Operating Officer, Executive Vice President, Chief Financial Officer and Treasurer. He previously served as NI’s Chief Financial Officer, Senior Vice President, IT and Manufacturing Operations and Treasurer from December 2002 to October 2010; as Chief Financial Officer and Treasurer from December 1997 to December 2002; as Acting Chief Financial Officer and Treasurer from July 1997 to December 1997; and as Corporate Controller and International Controller. Prior to joining NI, Mr. Davern worked both in Europe and in the United States for the international accounting firm of Price Waterhouse, LLP. Mr. Davern received his bachelor’s degree in Commerce and a diploma in professional accounting from University College in Dublin, Ireland.

Peter Zogas, Jr.Eric H. Starkloffjoined NI in 1985July 1997 and currently serves as SeniorExecutive Vice President, Global Sales and Marketing. He previously served as NI’s Senior Vice President Salesof Marketing from April 2013 to January 2014; Vice President of Marketing from November 2010 to March 2013; as Vice President of Product Marketing from October 2008 to October 2010; as Director of Product Marketing from August 2004 to September 2008; and as Product Marketing Manager from January 1998 to July 1996 to December 2002. His earlier positions with NI include National Sales Manager, Business Development Manager, Regional Sales Manager, and Sales Engineer. Prior to joining NI,2004. Mr. Zogas worked as an engineer at TI and, prior to that, at AT&T. Mr. ZogasStarkloff received his bachelor’s degree in Electrical Engineering from Drexel University.the University of Virginia.

Phillip D. HesterScott A. Rustjoined NI in 20091990 and currently serves as Senior Vice President, ofGlobal Research and Development. He previously served as the Senior Vice President and Chief Technology Officer at Advanced Micro Devices (AMD) from September 2005 to May 2008. Prior to AMD, he spent more than two decades working in a variety of leadership and management roles at IBM, including Chief Technology Officer andNI’s Vice President of Research and Development Test Systems from July 2013 to January 2014; as NI’s Vice President of Research and Technology for the PC divisionDevelopment in Penang, Malaysia from January 2011 to July 2013; as Vice President of Research and GeneralDevelopment of Modular Instruments from October 2008 to December 2010, as Director of Modular Instruments from March 2003 to September 2008; as Software Section Manager from October 2000 to March 2003; as Group Manager from October 1996 to October 2000; as Marketing Manager of the SystemsTest and Technology division, where he oversaw 1,500 employees globally.Measurement Software from August 1991 to September 1996, and as Applications Engineer from June 1990 to July 1991. Mr. Hester is also an entrepreneur, having founded a company that develops and manufactures easy-to-deploy server and storage technology for original equipment manufacturers. He has been a Director of ON Semiconductor since August 2006, and chairs the Science and Technology committee. Mr. HesterRust received both his bachelor’s and master’s degreesdegree in Electrical Engineering from UT Austin.Texas A&M University.

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EXECUTIVE COMPENSATION

The following Compensation Discussion and Analysis (“CD&A”) should be read in conjunction with the compensation tables contained elsewhere in this proxy statement. References to our “named executive officers” in this CD&A are to the same persons set forth in the compensation tables.

Compensation Discussion and Analysis

Overview of Compensation Philosophy and Objectives

NI’s philosophy towards compensation for its principalnamed executive officer, principal financial officer and its other two executive officers who were serving at the end of 2012 reflects the following principles:

Determining Executive Compensation

In establishing NI’s overall program for executive compensation, the Compensation Committee works closely with NI’s senior management, including its Chief Executive Officer and Vice President of Human Resources. However, NI’s executives do not participate in any Board or Compensation Committee deliberations relating to their own compensation.

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As described below, NI utilizes survey information to help determine whether the total compensation package for its executives is competitive with comparable companies. NI exercises

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judgment in allocating compensation among specific programs in view of its overall compensation philosophy, objectives, business results and risk assessment.

The Compensation Committee engaged a compensationFrederic W. Cook & Co. (“F.W. Cook”) as an independent consultant for 2011 compensation purposes and planspurposes. At that time, the Compensation Committee determined to do so at leastengage an independent consultant every three years. Accordingly, the Compensation Committee again engaged F.W. Cook in 2014 to review NI’s overall executive compensation structure and perform an analysis and assessment of NI’s compensation processes, methodologies and practices to evaluate their effectiveness and alignment with NI’s compensation philosophy and objectives (as outlined above). In connection with the engagement of F.W. Cook in 2014, the Compensation Committee determined that F.W. Cook met the independence requirements of applicable SEC and Nasdaq rules. Other than its engagement by the Compensation Committee in 2011 and 2014, F.W. Cook has not provided any other services to the Compensation Committee or NI.

For the past several years, the Compensation Committee has utilized data from Radford Surveys, a leading worldwide provider of survey information regarding executive compensation of technology companies. In setting compensation levels for 2012,2013, the Radford data which was utilized included executive compensation information of public companies in the high technology industry that had annual revenues ranging from $500 million to $1.5 billion. NI believes the information from public companies in such revenue range is appropriate because it affords an adequate sample size of comparable high technology companies and because the average annual revenue of the companies in such range is comparable to NI’s annual revenue. NI compares the compensation of its executive officers with that of the executive officers in the Radford survey as a whole rather than any individual company within such survey.

NI believes that total compensation at or around the 50^th percentile of the peer companies provided in the Radford survey is the appropriate starting point for benchmarking the compensation of its executives. Though NI uses such 50^th percentile as a reference point, NI does not target a specific percentile in the range of comparative information for each individual executive or for each component of compensation. Instead, NI structures a total compensation package in view of the comparative information and such other factors specific to the individual, including the level of responsibility, prior experience, expectations of future performance and assessment of risk as it relates to employee motivation and employee retention. NI uses information obtained from Radford to test for reasonableness and competitiveness of its compensation package as a whole, but exercises judgment in allocating compensation among executives and within each element of an individual’s total compensation package. Set forth on Exhibit A is each of the companies that are covered by the relevant portion of the Radford information utilized by NI for 20122013 compensation purposes. For 2012,2013, the actual total compensation paid to NI’s executive officers, excluding NI’s Chief Executive Officer, was between the 25th percentile and the 50th percentile of the peer companies in the Radford data.

NI does not have specific policies for allocating between long-term and currently paid out compensation nor policies for allocating between cash and non-cash compensation, and among different forms of non-cash compensation. Each NI executive (other than the CEO) may receive a mix of compensation comprised of base salary, discretionary bonuses, performance-based bonus, equity awards and service-based bonus. The amount of compensation allocated to each element of compensation is determined on a case-by-case basis. At his request, NI’s CEO, who is a founder of the company and NI’s largest stockholder, receives a base salary of $1 and does not participate in the executive bonus programs or receive equity awards.

With respect to the Annual Incentive Program, (“AIP”), each executive participates at a target level equal to either 20% or 30% of the executive’s base salary. The amount of cash bonus under the AIP ultimately paid depends on the extent to which the performance goals of each executive are achieved, in each case subject to adjustment at the discretion of the Compensation Committee.

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As described in greater detail below under “Analysis of Elements of Executive Compensation,” the Compensation Committee considers both NI performance and individual performance when determining the level of compensation for a number of the elements of executive

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compensation. For example, in determining the grants of RSUs and any increases in base salary, the Compensation Committee takes into consideration, among other things, the prior individual performance of an executive officer, as well as NI’s performance. Similarly, the AIPAnnual Incentive Program (“AIP”) is an “at risk” bonus program designed to induce NI’s executive officers to accomplish a set of goals based upon individual performance and NI’s business goals and reflects NI’s philosophy that total compensation should be related both to individual performance and NI’s performance. Amounts, if any, awarded under the discretionary cash program are determined solely on individual performance. For some of NI’s other elements of executive compensation, such as the annual company cash performance bonus program, NI’s performance as a whole is determinative of the compensation payable to the participants. The Compensation Committee believes that the various elements of executive compensation work together to promote NI’s objective that total compensation should be related both to individual performance and NI’s performance.

At our Annual Meeting in 2011, our stockholders adopted a three-year interval for “management say on pay” review. Accordingly, our stockholders last voted on such matter at our Annual Meeting in 2011 and approved, on an advisory (non-binding) basis and with over 98% of the votes cast in favor of the proposal, the compensation of our named executive officers. The Compensation Committee considered the results of this vote in establishing the compensation program for 2012.2013.

Elements of Executive Compensation

The components of NI’s executive compensation for 20122013 were as follows:

A broad base of NI’s employees participate in the compensation programs enumerated above with the exception of the AIP for executives. In addition, NI’s Senior Vice President, Sales and Marketing,Segments & Services, participates in a sales commission program based upon growth and profitability performance measures approved by the Compensation Committee.

NI’s executive and non-executive employees who meet the relevant eligibility requirements may also participate in the following programs:

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NI seeks to reward shorter-term performance through base salary, its annual bonus programs and its discretionary bonus program. Longer-term performance is incentivized through RSU grants and the service award program.

Analysis of Elements of Executive Compensation

Base Salary

NI’s goal is to provide its executives with competitive base salaries. NI uses independent survey information to help evaluate the reasonableness and competitiveness of its base salaries. NI determines base salary for each executive based on the level of job responsibilities, consideration of the prior performance of the executive and the company, the executive’s experience and tenure, consideration of the expected future contributions of the executive, the business risk presented to NI in the event the executive were to leave the employ of the company, and general compensation trends and practices in the technology industry, including pay levels and programs provided by comparable companies. In setting base salaries, NI does not utilize any particular formula but instead exercises judgment in view of its overall compensation philosophy and objectives. Individual base salaries are reviewed annually. After consideration of the factors described above, the base salaries of our named executive officers were not increased by an average of approximately 3% in September 2012for 2013 compared to the prior fiscal year, which increases were in line2012 with the budgetexception of Mr. Starkloff who received an increase of 21.7% upon his promotion to Senior Vice President in April 2013. In response to the adverse economic and business conditions facing NI in early 2013, a reduction in annual salary was implemented for executives, consisting of a 5% salary increases of 4% for our overall employee base.reduction effective June 1, 2013. These salary reductions ended on February 1, 2014. At his request, our CEO receives a base salary of $1 per year.

Annual Company Cash Performance Bonus Program

NI maintains a cash performance bonus program under which substantially all regular full-time and part-time employees, including executives, participate (the “Annual Performance Bonus Program”). To receive a payout under the plan, NI must achieve pre-determined goals for revenue growth and profitability. These goals, as provided in the plan, were 40% year over year organic revenue growth and 18% operating profit as a percent of revenue. The same goals apply to all participants in the plan including executive and non-executive employees. The amount of the Annual Performance Bonus Program is based on a bonus payment percentage multiplied by the eligible earnings of each participant. Eligible earnings include base salary, overtime pay and commissions but exclude bonuses, equity awards, relocation payments and previous cash performance bonus payments. The bonus payment percentage for executives is determined by multiplying 40% by two variables: NI’s actual organic revenue growth divided by the targeted level of revenue growth of 40%; and NI’s actual operating profit as a percentage of revenue divided by the target operating profit of 18%. The bonus payments percentage for non-executives was determined in the same manner except that the “multiplier” is 15% not 40%. Expressed as a formula, the bonus calculation for executives is as follows:

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For fiscal 2012,2013, NI’s named executives received individual payments under the Annual Performance Bonus Program in the range of approximately $20,501$1,728 to $27,280. Amounts under the Annual Performance Bonus Program are customarily made in two payments, one in the fourth quarter and the other upon the completion of the annual financial statement audit$3,845 which were paid in the first quarter of the following year.2014.

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Annual Incentive Program

NI maintains an AIP under which only officers and Business and Technology Fellows and Research and Development Fellowsfellows participate. Dr. Truchard, NI’s President and Chief Executive Officer, does not participate in the program. Under this program, payments are made to executive officers based upon the achievement of individual performance criteria and NI business goals as approved by the NI Board and NI’s President. Program participants are designated by NI’s President and approved by the Compensation Committee. The participants under the AIP and the AIP goals are determined annually. The amount of cash bonus under the AIP ultimately paid depends on the extent to which the performance goals of each executive are achieved, in each case subject to adjustment at the discretion of the Compensation Committee.

The AIP is intended to increase stockholder value and promote NI’s success by providing incentive and reward for the accomplishment of key objectives by NI executives. Under the AIP for 2013, an executive is eligible to receive a target amount equal to 30% of base salary for Executive Vice Presidents and Senior Vice Presidents (or, in case of the Senior Vice President of Sales and Marketing,Segments & Services, salary plus targeted commission) and a target of 20% of base salary for Vice Presidents Business and Technology Fellows, and Research and Development Fellows.fellows. For the purposes of the AIP, the base salary amount to be used is set by the Compensation Committee at the time the goals are approved. Payments are made based on whether the individual executive has achieved his or her specified objectives for the year. Each executive typically has four to six objectives that are targeted to reward achievements in the executive’s functional area or NI business goals. The objectives for NI’s executive officers are presented to and approved by NI’s President and then submitted for approval each year to the NI Board. The amount of the bonus for an executive officer which is allocated to each specific objective is approved each year by the Compensation Committee.

With respect to NI’s executive officers, following the end of NI’s fiscal year, NI’s President and the Compensation Committee meet to determine whether the objectives of each executive officer were attained and then approve or disapprove the payment of the annual incentive amounts based upon the achievement of such objectives and the discretion of NI’s President and the Compensation Committee. NI’s President and the Compensation Committee, acting together, have the discretion to pay all or a portion of an amount to an AIP participant even if such participant did not meet a particular objective if the President and the Compensation Committee believe that such payment is appropriate to achieve the objectives of the program. NoUpon Mr. Hester’s death on September 17, 2013, discretion was used under the AIP with respect to awards inthe payment of his award for fiscal 2012.2013 even though he was not an officer at the end of the fiscal year.

For fiscal 2012,2013, NI made cash bonus payments to named executives under the AIP that ranged from approximately $37,989$43,719 to $79,386$75,504 per executive.

Under the AIP, the Compensation Committee has the discretion to make payments of any cash incentive bonus in the fourth quarter of the calendar year based upon projected achievement levels (“Estimated Payment”) rather than waiting until the following calendar year. The payment of an Estimated Payment is subject to reconciliation after our books have been closed and audited. If the Estimated Payment is less than the final amount due to the AIP participant, an additional payment

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equal to the amount of the shortfall is made to such participant. If the Estimated Payment is more than the final amount due to the AIP participant, such participant shall remit to us the amount of the overpayment. For fiscal 2013, no such Estimated Payment was made.

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The tables below set forth the performance criteria, potential awards and actual awards under the AIP as well as the weightings assigned to the objectives for 20122013 for each of the named executives, except Dr. Truchard, NI’s President and Chief Executive Officer, who does not participate in the program:

20122013 Annual Incentive Program Goals and Awards for the Named Executives

(1) NI is not disclosing the specific target levels with respect to performance goals because such information represents confidential trade secrets or confidential commercial or financial information, the disclosure of which would cause NI competitive harm. The performance goals were set to be moderately difficult, or stretch goals, but not unachievable.

(2) The goals in items 1), 2), 4) and 3)5) above contain incremental payout thresholds and an increased payout if actual results attained exceed the targeted 100%. In such instance, the maximum amount payable to Mr. Davern would be $135,450.$160,200.

(1) NI is not disclosing the specific target levels with respect to performance goals because such information represents confidential trade secrets or confidential commercial or financial information, the disclosure of which would cause NI competitive harm. The performance goals were set to be moderately difficult, or stretch goals, but not unachievable.

(2) The goals in items 1) and 2) above contain incremental payout thresholds and an increased payout if actual results attained exceed the targeted 100%. In such event,instance, the maximum amount payable to Mr. ZogasStarkloff would be $103,200.$91,781.

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(1) NI is not disclosing the specific target levels with respect to performance goals because such information represents confidential trade secrets or confidential commercial or financial information, the disclosure of which would cause NI competitive harm. The performance goals were set to be moderately difficult, or stretch goals, but not unachievable.

(2) The goals in items 1), 2) and 4) above contain incremental payout thresholds and an increased payout if actual results attained exceed the targeted 100%. In such event, the maximum amount payable to Mr. Zogas would be $108,000.

(1) NI is not disclosing the specific target levels with respect to performance goals because such information represents confidential trade secrets or confidential commercial or financial information, the disclosure of which would cause NI competitive harm. The performance goals were set to be moderately difficult, or stretch goals, but not unachievable.

(2) Mr. Hester passed away on September 17, 2013. The Compensation Committee reviewed his goal attainment and awarded the compensation amounts shown.

In assessing performance against the objectives for each named executive participating in the AIP, NI’s President considered the actual results for 20122013 against the specific deliverables associated with each objective, the extent to which the objective was a significant stretch goal for the organization, and whether significant unforeseen obstacles or favorable circumstances altered the expected difficulty in achieving the desired results. Based on the foregoing factors, NI’s President recommended, and the Compensation Committee approved, a cash payment for each named executive. As set forth under the column heading “2012“2013 Actual Payout,” the actual payouts to NI’s named executive officers ranged from 30%56% to 78%79% of the total amount they were eligible to receive under the AIP in 2012.2013.

Sales Commission Program Applicable to Senior Vice President of Sales and Marketing.    Segments & Services.The amount of the quarterly sales commission paid to Mr. Zogas is the result of an attainment factor multiplied by a quarterly commission target amount. The attainment factor is based

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upon two components: NI’s actual quarterly year over year revenue growth compared to the target quarterly year over year revenue growth (“revenue factor”); and NI’s actual quarterly operating profit compared to the target quarterly operating profit as set forth in the operating budget (the “profit factor”). The profit factor may not exceed one for the purposes of computing the commission. NI’s Board of Directors approves the operating budget which is the basis for the target quarterly year over year revenue growth and the target quarterly profit used for the purposes of calculating the actual commission payments made to Mr. Zogas. The quarterly commission target amount for 20122013 was $16,000 per quarter, based upon the targeted annual commission amount of $64,000 set by the Compensation Committee. However, effective June 1, 2013, a 5% salary reduction was applied resulting in an annual targeted commission amount of $60,800. The quarterly commission calculation can be expressed as a formula as follows:

NI is not disclosing the specific target levels utilized in the formula set forth above for determining Mr. Zogas’ sales commission payouts because they represent confidential information that NI does not disclose to the public and NI believes that disclosure of such information would cause it competitive harm. The specific target levels were set to be moderately difficult, or stretch goals, but not unachievable.

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Under this sales commission program, Mr. Zogas earned for 20122013 an aggregate of $63,288,$46,379, which represents approximately 99%76% of the targeted annual commission amount.

Discretionary Cash Bonus Program

NI maintains a discretionary cash performance bonus program under which all employees, including executives, are eligible to receive awards. NI’s President does not participate in the program. Under this program, awards are made in recognition of a special achievement by the employee. Awards under this program have normally ranged between $100 and $2,000 per award. Awards beyond $2,000 require approval by senior management. The average award under the discretionary cash performance program in 2012 for employees was approximately $1,262. The purpose of this program is to award a specific accomplishment that is not covered by NI’s other compensation programs. Awards under this program vary based on the nature of the recognition event. The amount of the award for executives is determined by NI’s President and the amount of the award for non-executive employees is determined by the departmental supervisors.

The average award under this program in 2013 was less than $1,000. During 2012,2013, none of the named executives received an award under this program. NI’s President does not participate in this program.

Restricted Stock Unit (RSU) Awards

Determining the Overall Level of Equity Compensation Awards.    NI uses equity compensation to incentivize a significant number of its employees. In 2012,2013, approximately 43.6%41.6% of all U.S. based regular, full-time professional employees received equity based compensation. NI’s use of stock based equity compensation for its employees is driven by NI’s goal of aligning the long-term interests of its employees with its overall performance and the interests of its stockholders. NI’s equity compensation program is also driven by NI’s desire to be sensitive to the dilutive impact that such equity compensation will have on its stockholders.

Allocation of Equity Compensation Awards.    In 2012,2013, NI granted a total of 1,311,105764,315 RSUs to all employees, which represented 1.1%0.61% of NI’s shares outstanding at December 31, 2012.2013. Of such amount, a total of 50,00025,000 RSUs were granted to NI’s named executives, representing 3.9%3.27% of all

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RSUs granted in 2012.2013. RSUs granted to executives vest over a period of ten years, subject to acceleration based on NI’s performance. Expressed as a formula, the acceleration amount for executives is as follows:

A set formula for allocating RSUs to the executives as a group or to any particular executive is not utilized. Instead, the Compensation Committee exercises its judgment and discretion and considers, among other things, the role and responsibility of the executive, competitive factors, the labor market place,dynamics, the retentionrelative importance of theretaining each executive, the amount of stock based equity compensation already held by the executive, the non-equity compensation received by the executive and the total number of RSUs to be granted to all participants during the year.

Timing of Equity Awards.    The Compensation Committee typically grants RSUs to executives and current employees once per year. Such grants are made at a meeting of the Compensation Committee held in the second quarter of the year. RSU grants to new employees were issued fivefour times

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in 20122013 at Compensation Committee meetings. NI does not have any program, plan or practice to time RSU grants in coordination with the release of material non-public information. NI does not time, nor does NI plan to time, the release of material non-public information for the purposes of affecting the value of executive compensation.

Executive Equity Ownership.    NI’s President and Chief Executive Officer, Dr. Truchard, is NI’s largest stockholder. NI encourages its executives to hold a significant equity interest in NI. However, NI does not have specific share retention and ownership guidelines for its executives. NI does not permit executives to sell short its stock. NI prohibits named executives from holding NI stock in a margin account and prohibits the purchase or sale of exchange traded options on its stock by executives.

Type of Equity Awards.    Prior to 2005, the long-term equity incentive component of NI’s compensation program consisted solely of stock options. Beginning in 2005, NI began to utilize RSUs as its principal equity compensation incentive. Under the 2010 Incentive Plan, NI is permitted to issue RSUs and restricted stock but not stock options.

Service Award Program

NI maintains a service award bonus program under which all employees, including executives, are eligible to receive awards based on the number of years of continued employment with NI. NI’s President does not participate in the program. Under this program, upon achieving a five-year period of continuous employment with NI, an employee receives a cash award and a $100 dinner gift certificate, as well as other non-monetary awards such as a plaque or lunch with NI’s President, Vice President of Human Resources or another NI executive. Awards under this program have historically been in the range of $100 to $1,000 in cash per award, with employees receiving $100 in cash at their 5^thanniversary of service with NI and $1,000 in cash at their 10^th, 15^th, 20^th and 25^th anniversaries of service with NI.

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During 2012,2013, none of the named executives received an award under this program.

Performance Based Compensation and Financial Restatement

To date, NI has not experienced a financial restatement and has not considered or implemented a policy regarding retroactive adjustments to any cash or equity based incentive compensation paid to its executives and other employees where such payments were predicated upon the achievement of certain financial results that would subsequently be the subject of a restatement.

Change of Control Considerations

All NI executives are employed at will and do not have employment agreements, severance payment arrangements or payment arrangements that would be triggered by a merger or other change of control of NI. However, NI’s Amended and Restated 1994 Incentive Plan, 2005 Incentive Plan and 2010 Incentive Plan provide that in the event of a change of control of NI, all unvested RSUs and stock options held by executive and non-executive employees shall immediately vest in full.

Effect of Accounting and Tax Treatment on Compensation Decisions

In the review and establishment of NI’s compensation programs, NI considers the anticipated accounting and tax implications to NI and its executives. In this regard, in 2005, the NI Board of

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Directors and Compensation Committee determined to change NI’s equity compensation program from the use of stock options to the use of RSUs in response to changes in the accounting treatment of equity awards under FASB ASC 718, Compensation – Compensation—Stock Compensation. While NI considers the applicable accounting and tax treatment, these factors alone are not dispositive, and NI also considers the cash and non-cash impact of the programs and whether a program is consistent with NI’s overall compensation philosophy and objectives.

Section 162(m) of the Internal Revenue Code of 1986, as amended (the “Code”), imposes a limit of $1 million on the amount of compensation that NI may deduct in any one year with respect to its named executive officers, unless certain criteria are satisfied. Performance-based compensation, as defined in the Code, is fully deductible if the programs are approved by stockholders and meet other requirements. NI believes that grants of RSUs under its 2010 Incentive Plan that vest solely based on the passage of time do not qualify as performance-based for purposes of satisfying the conditions of Section 162(m). In 2012, one of NI’s named executive officers received compensation in excess of the Section 162(m) limit. In general, NI has determined that it will not seek to limit executive compensation so that it is deductible under Section 162(m). From time to time, NI monitors whether it might be in its interests to structure its compensation programs to satisfy the requirements of Section 162(m). NI seeks to maintain flexibility in compensating its executives in a manner designed to promote its corporate goals and therefore the Compensation Committee has not adopted a policy requiring all compensation to be deductible.

In 2013, none of NI’s named executive officers received compensation in excess of the Section 162(m) limit. NI believes that payments under its Annual Performance Bonus Program and under the AIP and grants of RSUs under its 2010 Incentive Plan that vest solely based on the passage of time do not qualify as performance-based for purposes of satisfying the conditions of Section 162(m). From time to time, NI monitors whether it might be in its interests to structure its compensation programs to satisfy the requirements of Section 162(m). The Compensation Committee will continue to assess the impact of Section 162(m) on NI’s compensation practices and determine what further action, if any, is appropriate.

Role of Executives in Executive Compensation Decisions

The Compensation Committee seeks input from NI’s President and Chief Executive Officer, Dr. Truchard, when discussing the performance of, and compensation levels for executives other than

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himself. The Compensation Committee also works closely with Dr. Truchard and with NI’s Vice President of Human Resources and others, as required, in evaluating the financial, accounting, tax and retention implications of its various compensation programs. Neither Dr. Truchard nor any of NI’s other executives participates in deliberations relating to his own compensation.

COMPENSATION COMMITTEE REPORT*

The Compensation Committee of NI has reviewed and discussed the Compensation Discussion and Analysis required by Regulation S-K Item 402(b) (the “CD&A”) with management and based upon such review and discussion, the Compensation Committee recommended to the Board of Directors that the CD&A be included in this Proxy Statement.

Respectfully Submitted,

Duy-Loan T. Le

John K. Medica

John M. Berra

* The foregoing Compensation Committee Report does not constitute soliciting material and should not be deemed filed or incorporated by reference into any other NI filing under the Securities Act or the Exchange Act, except to the extent that NI specifically incorporates this Compensation Committee Report by express reference therein.

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Summary Compensation Table

The following table shows the total compensation earned by NI’s named executives during the years ended December 31, 2012,2013, December 31, 2011,2012, and December 31, 2010:2011:

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Other than the foregoing, for 2010, 2011, 2012 and 2012,2013, NI did not provide its named executives with any form of compensation that would be reportable under Item 402(c)(2)(ix) of Regulation S-K. NI does not pay or accrue cash dividends on unvested RSUs.

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Grants of Plan-Based Awards

For Fiscal Year Ended December 31, 20122013

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Summary Compensation Table and Grants of Plan-Based Awards Table Discussion

The level of salary and bonus in proportion to total compensation ranged from approximately 35%13% to 44%55% for each of the named executives in 2012,2013, except for Dr. Truchard. Since Dr. Truchard does not receive RSU awards, his salary represented approximately 100% of his total compensation in 2012.2013.

All NI employees, including executives, are employed at will and do not have employment agreements, severance payment arrangements or other payment arrangements that would be trigged by a merger or other change of control of NI. However, NI’s 2010 Incentive Plan, NI’s 2005 Incentive Plan and Amended and Restated 1994 Incentive Plan provide that in the event of a change of control of NI, all unvested RSUs and stock options held by executive and non-executive employees shall immediately vest in full.

NI has not repriced any stock options or made any material modifications to any equity-based awards to its executive officers.

Outstanding Equity Awards at Fiscal 20122013 Year-End

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