X0201 4 2004-02-26 0 0000935494 NATIONAL INSTRUMENTS CORP /DE/ NATI 0001008359 TRUCHARD JAMES J C/O NATIONAL INSTRUMENTS CORP 11500 N. MOPAC EXPRESSWAY, BLDG. B AUSTIN TX 78759-3504 1 1 1 0 President Common Stock 2004-02-26 4 S 0 5250 33.3 D 16991791 D Common Stock 2004-02-26 4 S 0 3500 33.3 D 1716250 I by the Truchard Descendants' Trust Shares were sold under Reporting Person's 10(b)5-1 Plan. On February 20, 2004, the common stock of the Issuer split 3-for-2, resulting in the Reporting Person's acquisition of 5,665,680 additional shares of common stock. On February 20, 2004, the common stock of the Issuer split 3-for-2, resulting in the The Truchard Descendants' Trust's acquisition of 573,250 additional shares of common stock. David G. Hugley as attorney-in-fact for James J. Truchard 2004-02-27