0001140361-11-022943.txt : 20110422 0001140361-11-022943.hdr.sgml : 20110422 20110422151121 ACCESSION NUMBER: 0001140361-11-022943 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20110420 FILED AS OF DATE: 20110422 DATE AS OF CHANGE: 20110422 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Porterfield Robert CENTRAL INDEX KEY: 0001307795 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 000-25426 FILM NUMBER: 11775658 MAIL ADDRESS: STREET 1: 11500 N. MOPAC EXPWY CITY: AUSTIN STATE: TX ZIP: 78759 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: NATIONAL INSTRUMENTS CORP /DE/ CENTRAL INDEX KEY: 0000935494 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-PREPACKAGED SOFTWARE [7372] IRS NUMBER: 741871327 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 11500 NORTH MOPAC EXPRESSWAY CITY: AUSTIN STATE: TX ZIP: 78759 BUSINESS PHONE: 5123389119 MAIL ADDRESS: STREET 1: 11500 NORTH MOPAC EXPRESSWAY CITY: AUSTIN STATE: TX ZIP: 78759 4 1 doc1.xml FORM 4 X0303 4 2011-04-20 0 0000935494 NATIONAL INSTRUMENTS CORP /DE/ NATI 0001307795 Porterfield Robert C/O NATIONAL INSTRUMENTS CORP 11500 N. MOPAC EXPWY AUSTIN TX 78759 0 1 0 0 Vice President Restricted Stock Units 2011-04-20 4 A 0 6000 0 A 2026-05-01 Common Stock 6000 6000 D Restricted Stock Units 2011-04-20 4 A 0 6000 0 A 2026-05-01 Common Stock 6000 6000 I Spouse Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock. The restricted stock units vest and become exercisable based on time and performance milestones set by the Issuer. David G. Hugley as attorney-in-fact for Robert R. Porterfield 2011-04-22