X0306 4 2023-01-30 0 0000935494 NATIONAL INSTRUMENTS CORP NATI 0001598818 Rust Scott Arthur C/O NATIONAL INSTRUMENTS CORPORATION 11500 NORTH MOPAC AUSTIN TX 78759 0 1 0 0 Executive Vice President Common Stock 2023-01-30 4 A 0 7962 0 A 57164 D Performance-Based Restricted Stock Units 2023-01-30 4 D 0 8947 0 D 2038-05-01 Common Stock 8947 0 D Represents the number of shares of Common Stock vested pursuant to the performance-based restricted stock unit ("PRSU") award that was granted on February 19, 2020 and reported voluntarily on the Form 4 filed with the Securities and Exchange Commission on February 20, 2020, based upon the determination that 89% of the PRSU vested given that the issuer's total shareholder return ranked at the 48.54 percentile as compared to the Russell 2000 Index over the performance period. 985 PRSUs not eligible for vesting at the end of the performance period were canceled. The number of PRSUs reported in Table II represents the target number of PRSUs that were granted to the reporting person pursuant to the Issuer's 2015 Equity Incentive Plan. Per the terms of the award agreement governing the PRSUs, the number of underlying shares of the Issuer's common stock that the reporting person is ultimately entitled to receive at the time of vesting ranges from 0% to 200% of the target number of PRSUs granted, subject to how the Issuer's total shareholder return ranks in comparison to companies that comprise the Russell 2000 Index over a performance period consisting of the three years ended December 31, 2022. Deborah Donahue as attorney-in-fact for Scott Arthur Rust 2023-02-01