The above information was disclosed in a filing to the SEC. Some additional info was provided as follows:
Shares were sold under Reporting Person's 10(b)5-1 Plan.
To see this filing in its entirety, click here
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Other recent filings from the company include the following:
National Instruments: Departure Of Directors Or Certain Officers; Election Of Directors; Appointment Of Certain Officers; Compensatory Arrangements Of Certain Officers - March 6, 2014
National Instruments Corporation director just disposed of 4,000 shares - March 5, 2014