X0306 4 2016-11-07 0 0000935494 NATIONAL INSTRUMENTS CORP NATI 0001192890 DAVERN ALEXANDER M C/O NATIONAL INSTRUMENTS CORP 11500 NORTH MOPAC AUSTIN TX 78759 0 1 0 0 COO, CFO & EXECUTIVE VP Common Stock 2016-11-07 4 S 0 5500 28.3111 D 81227 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $28.29 to $28.315, 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. David G. Hugley as attorney-in-fact for Alexander M. Davern 2016-11-08