# EDGAR Filing Document

**Accession Number:** 0000935494
**File Stem:** 0001140361-23-013881
**Filing Date:** 2023-3
**Character Count:** 2324
**Document Hash:** e23b51ab78b73c84f3243b264e5fd002
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-23-013881.hdr.sgml**: 20230327

**ACCESSION NUMBER**: 0001140361-23-013881

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20230327

**DATE AS OF CHANGE**: 20230327

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NATIONAL INSTRUMENTS CORP
- **CENTRAL INDEX KEY:** 0000935494
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-PREPACKAGED SOFTWARE [7372]
- **IRS NUMBER:** 741871327
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41595
- **FILM NUMBER:** 23761587

**BUSINESS ADDRESS:**
- **STREET 1:** 11500 NORTH MOPAC EXPRESSWAY
- **CITY:** AUSTIN
- **STATE:** TX
- **ZIP:** 78759
- **BUSINESS PHONE:** 5123389119

**MAIL ADDRESS:**
- **STREET 1:** 11500 NORTH MOPAC EXPRESSWAY
- **CITY:** AUSTIN
- **STATE:** TX
- **ZIP:** 78759

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NATIONAL INSTRUMENTS CORP /DE/
- **DATE OF NAME CHANGE:** 19950113

### UNITED STATES <br>

### SECURITIES AND EXCHANGE COMMISSION <br>

### Washington, D.C. 20549

### SCHEDULE 14A <br>

### (RULE 14a-101)

#### Proxy Statement Pursuant to Section 14(a) of the <br>

#### Securities Exchange Act of 1934 <br>

#### (Amendment No.)
Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐

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| | |
|:---|:---|
| Check the appropriate box:  | Check the appropriate box:  |
| ☐ | Preliminary Proxy Statement |
| ☐ | **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))** |
| ☐ | Definitive Proxy Statement |
| ☒ | Definitive Additional Materials |
| ☐ | Soliciting Material Pursuant to §240.14a-12 |

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## National Instruments Corporation <br>

## (Name of Registrant as Specified In Its Charter)

#### (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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| | |
|:---|:---|
| Payment of Filing Fee (Check the appropriate box):  | Payment of Filing Fee (Check the appropriate box):  |
| ☒ | No fee required. |
| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11. |
| ☐ | Fee paid previously with preliminary materials. |

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