RAZDAN ASH 4

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

Form 4

Period: 2011-05-01

Other

Transactions

Exercise/Conversion
Restricted Stock Units
2011-05-01−1,001→ 1,434 total
Exp: 2020-05-01→ Common Stock (2,435 underlying)
Exercise/Conversion
Restricted Stock Units
2011-05-01−751→ 2,179 total
Exp: 2022-05-01→ Common Stock (2,930 underlying)
Tax Payment
Common Stock
2011-05-02$30.32/sh−1,144$34,686→ 55,906 total
Exercise/Conversion
Common Stock
2011-05-02+4,130→ 57,050 total
Exercise/Conversion
Common Stock
2011-05-02$23.98/sh+262$6,282→ 56,168 total
Exercise/Conversion
Restricted Stock Units
2011-05-01−626→ 2,749 total
Exp: 2024-05-01→ Common Stock (3,375 underlying)
Exercise/Conversion
Restricted Stock Units
2011-05-01−1,001→ 2,136 total
Exp: 2021-05-01→ Common Stock (3,137 underlying)
Exercise/Conversion
Restricted Stock Units
2011-05-01−751→ 2,755 total
Exp: 2023-05-01→ Common Stock (3,506 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.

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