| SC 13G/A | 2019-07-10 | BlackRock Inc. | NATIONAL INSTRUMENTS CORP | 13,961,880 | 10.6% | EDGAR |
| SC 13G/A | 2019-02-14 | PRICE T ROWE ASSOCIATES INC /MD/ | NATIONAL INSTRUMENTS CORP | 8,219,712 | 6.2% | EDGAR |
| SC 13G/A | 2019-02-12 | WELLINGTON MANAGEMENT GROUP LLP | NATIONAL INSTRUMENTS CORP | 4,689,525 | 3.5% | EDGAR |
| SC 13G/A | 2019-02-12 | JANUS HENDERSON GROUP PLC | NATIONAL INSTRUMENTS CORP | 11,153,328 | 8.4% | EDGAR |
| SC 13G/A | 2019-02-11 | VANGUARD GROUP INC | NATIONAL INSTRUMENTS CORP | 11,636,381 | 8.8% | EDGAR |
| SC 13G/A | 2019-02-06 | BlackRock Inc. | NATIONAL INSTRUMENTS CORP | 11,625,479 | 8.8% | EDGAR |
| SC 13G/A | 2018-02-14 | PRICE T ROWE ASSOCIATES INC /MD/ | NATIONAL INSTRUMENTS CORP | 9,608,560 | 7.3% | EDGAR |
| SC 13G/A | 2018-02-14 | TRUCHARD JAMES J | NATIONAL INSTRUMENTS CORP | 8,817,409 | 6.7% | EDGAR |
| SC 13G/A | 2018-02-13 | JANUS CAPITAL MANAGEMENT LLC | NATIONAL INSTRUMENTS CORP | 0 | 0.0% | EDGAR |
| SC 13G | 2018-02-13 | JANUS HENDERSON GROUP PLC | NATIONAL INSTRUMENTS CORP | 11,392,342 | 8.7% | EDGAR |
| SC 13G/A | 2018-02-09 | VANGUARD GROUP INC | NATIONAL INSTRUMENTS CORP | 9,975,549 | 7.6% | EDGAR |
| SC 13G | 2018-02-08 | WELLINGTON MANAGEMENT GROUP LLP | NATIONAL INSTRUMENTS CORP | 6,652,396 | 5.1% | EDGAR |
| SC 13G/A | 2018-01-25 | BlackRock Inc. | NATIONAL INSTRUMENTS CORP | 8,861,057 | 6.8% | EDGAR |
| SC 13G/A | 2017-02-13 | JANUS CAPITAL MANAGEMENT LLC | NATIONAL INSTRUMENTS CORP | 10,923,681 | 8.5% | EDGAR |
| SC 13G/A | 2017-02-13 | TRUCHARD JAMES J | NATIONAL INSTRUMENTS CORP | 10,356,321 | 8.0% | EDGAR |
| SC 13G/A | 2017-02-10 | VANGUARD GROUP INC | NATIONAL INSTRUMENTS CORP | 9,018,388 | 7.0% | EDGAR |
| SC 13G | 2017-02-07 | PRICE T ROWE ASSOCIATES INC /MD/ | NATIONAL INSTRUMENTS CORP | 7,000,958 | 5.4% | EDGAR |
| SC 13G/A | 2017-01-25 | BlackRock Inc. | NATIONAL INSTRUMENTS CORP | 8,747,088 | 6.8% | EDGAR |
| SC 13G/A | 2016-10-11 | BROWN ADVISORY INC | NATIONAL INSTRUMENTS CORP | 11,032 | 0.0% | EDGAR |
| SC 13G | 2016-02-16 | JANUS CAPITAL MANAGEMENT LLC | NATIONAL INSTRUMENTS CORP | 6,813,314 | 5.4% | EDGAR |