Company: NSSC
Filing Date: 2025-10-24
Form Type: DEFA14A
Source: 0001140361-25-039261
Chunk: 0

Company: NAPCO SECURITY TECHNOLOGIES, INC
Filing Date: 2025-10-24
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(a)(2)) |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting Material Pursuant to Section 240.14a-2 |

NAPCO SECURITY TECHNOLOGIES, INC. (Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than Registrant) Payment of Filing Fee (Check the appropriate box):

| ☒ |     | No fee required                                                                               |
| ☐ |     | Fee paid previously with preliminary materials.                                               |
| ☐ |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 
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