Porterfield Robert 4

4 · NATIONAL INSTRUMENTS CORP /DE/ · Filed May 4, 2011

Insider Transaction Report

Form 4

Period: 2011-05-01

NATIONAL INSTRUMENTS CORP /DE/NATI

Porterfield Robert

Vice President

Transactions

Exercise/Conversion
Restricted Stock Units
2011-05-01−1,252→ 3,632 total
Exp: 2022-05-01→ Common Stock (4,884 underlying)
Exercise/Conversion
Restricted Stock Units
2011-05-01−1,001→ 4,399 total
Exp: 2024-05-01→ Common Stock (5,400 underlying)
Exercise/Conversion
Restricted Stock Units
2011-05-01−1,252→ 3,632 total(indirect: By Spouse)
Exp: 2022-05-01→ Common Stock (4,884 underlying)
Exercise/Conversion
Restricted Stock Units
2011-05-01−2,504→ 3,583 total
Exp: 2020-05-01→ Common Stock (6,087 underlying)
Exercise/Conversion
Restricted Stock Units
2011-05-01−1,252→ 4,592 total
Exp: 2023-05-01→ Common Stock (5,844 underlying)
Exercise/Conversion
Common Stock
2011-05-01+7,261→ 70,874 total
Exercise/Conversion
Restricted Stock Units
2011-05-01−1,001→ 1,434 total(indirect: By Spouse)
Exp: 2020-05-01→ Common Stock (2,435 underlying)
Exercise/Conversion
Restricted Stock Units
2011-05-01−1,252→ 4,592 total(indirect: By Spouse)
Exp: 2023-05-01→ Common Stock (5,844 underlying)
Exercise/Conversion
Common Stock
2011-05-01+5,257→ 76,131 total(indirect: By Spouse)
Exercise/Conversion
Restricted Stock Units
2011-05-01−1,001→ 4,399 total(indirect: By Spouse)
Exp: 2024-05-01→ Common Stock (5,400 underlying)
Exercise/Conversion
Common Stock
2011-05-02$23.98/sh+297$7,121→ 76,428 total(indirect: By Spouse)
Exercise/Conversion
Restricted Stock Units
2011-05-01−751→ 1,601 total(indirect: By Spouse)
Exp: 2021-05-01→ Common Stock (2,352 underlying)
Exercise/Conversion
Restricted Stock Units
2011-05-01−1,252→ 2,669 total
Exp: 2021-05-01→ Common Stock (3,921 underlying)

Footnotes (3)

[F1]Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
[F2]The restricted stock units vest and become exercisable based on time and performance milestones set by the Issuer.
[F3]On February 22, 2011, the common stock of National Instruments Corporation split 3-for-2, resulting in the reporting person's ownership of additional shares of common stock.

Documents

1 file

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doc1.xmlPrimary
FORM 4