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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
935494	National Instruments Corp	NATI	Services-Prepackaged Software (7372)	741871327

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1008359	J James Truchard	C/O National Instruments Corp 11500 N. Mopac Expressway, Bldg. C Austin TX 78759-3504		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2017-04-17	2,500	$32.12	9,256,416	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	380,875	Indirect	Held by Truchard 2010 Grandchildren's Trust, Dr. Truchard is the trustee.
Common Stock	302,144	Indirect	Held by Truchard Descendant's Trust, Dr. Truchard is the trustee.
Common Stock	302,143	Indirect	Held by Truchard Descendant's Trust II, Dr. Truchard is the trustee.
Common Stock	77,243	Indirect	Held by Truchard Foundation, Dr. Truchard is the president.

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 22, 2016.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $32.00 to $32.25, inclusive. The reporting person undertakes to provide to National Instruments Corporation, any security holder of National Instruments Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote to this Form 4.