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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
1092457	M Donald Carlton	C/O National Instruments Corporation 11500 North Mopac Expressway Austin TX 78759		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	Acquisiton	2013-02-04	11,250	$16.11	46,280	No	4	M	Direct
Common Stock	Disposition	2013-02-04	11,250	$29.47	35,030	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (right to buy)	Disposition	2013-02-04	11,250	$0.00	11,250	$16.11

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2013-05-13	No	4	M	Direct

Footnotes

Options vested and became exercisable based on time and performance milestones set by the Issuer.
This option was previously reported as covering 5,000 shares at an exercise price of $36.25. On February 20, 2004, the common stock of National Instruments Corporation split 3-for-2, resulting in the reporting person's ownership of 2,500 additional shares.
On February 22, 2011, the common stock of National Instruments Corporation split 3-for-2, resulting in the reporting person's ownership of 3,750 additional shares.