<SEC-DOCUMENT>0001683168-25-004447.txt : 20250612
<SEC-HEADER>0001683168-25-004447.hdr.sgml : 20250612
<ACCEPTANCE-DATETIME>20250612163029
ACCESSION NUMBER:		0001683168-25-004447
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20250612
DATE AS OF CHANGE:		20250612

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INTRUSION INC
		CENTRAL INDEX KEY:			0000736012
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER COMMUNICATIONS EQUIPMENT [3576]
		ORGANIZATION NAME:           	06 Technology
		EIN:				751911917
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-281565
		FILM NUMBER:		251043259

	BUSINESS ADDRESS:	
		STREET 1:		101 EAST PARK BLVD, SUITE 1200
		CITY:			PLANO
		STATE:			TX
		ZIP:			75074
		BUSINESS PHONE:		(888) 637-7770

	MAIL ADDRESS:	
		STREET 1:		101 EAST PARK BLVD, SUITE 1200
		CITY:			PLANO
		STATE:			TX
		ZIP:			75074

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTRUSION COM INC
		DATE OF NAME CHANGE:	20000601

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ODS NETWORKS INC
		DATE OF NAME CHANGE:	19970507

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	OPTICAL DATA SYSTEMS INC
		DATE OF NAME CHANGE:	19950517
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<FILENAME>intrusion_424b3.htm
<DESCRIPTION>PROSPECTUS
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Filed Pursuant to Rule 424(b)(3)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"><B>Registration No. 333-281565</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>SUPPLEMENT NO. 1 TO PROSPECTUS SUPPLEMENT DATED
FEBRUARY 10, 2025 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>(To Prospectus Supplement and Prospectus dated
February 10, 2025)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><IMG SRC="image_001.jpg" ALT="" STYLE="height: 46px; width: 175px"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>INTRUSION, INC.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">This Supplement No. 1 to Prospectus Supplement
(this &ldquo;Supplement No. 1&rdquo;) amends and supplements the information in the prospectus supplement (the &ldquo;ATM Prospectus Supplement&rdquo;)
to the registration statement on Form S-3 (File No. 333-281565) (the &ldquo;Form S-3&rdquo;) filed on January 31, 2025 and effective on
February 10, 2025 of Intrusion, Inc. (&ldquo;we,&rdquo; &ldquo;us&rdquo; and &ldquo;our&rdquo;). This Supplement No. 1 should be read
in conjunction with and is qualified in its entirety by reference to the ATM Prospectus Supplement, except to the extent that the information
herein amends or supersedes the information contained therein. This Supplement No. 1 is not complete without and may only be delivered
or utilized in connection with the ATM Prospectus Supplement, and any future amendments or supplements thereto.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">We filed the ATM Prospectus Supplement to register
the offer and sale of $50,000,000 of shares of our common stock, from time to time under the terms of an At Market Sales Agreement (the
&ldquo;Sales Agreement&rdquo;) with B. Riley Securities, Inc. (&ldquo;B. Riley&rdquo;) dated as of August 5, 2021, relating to the offer
and sale of shares of our common stock. In accordance with the terms of the Sales Agreement, we could offer and sell shares of our common
stock having an aggregate offering price of up to $50,000,000 at any time and from time to time through B. Riley, acting as sales agent
or principal, in sales deemed to be &ldquo;at the market&rdquo; equity offerings as defined in Rule 415 promulgated under the Securities
Act of 1933, as amended (the &ldquo;ATM Program&rdquo;). On June 6, 2025, the Sales Agreement was terminated, effective June 11, 2025.
As of June 11, 2025, we have not sold any shares of our common stock pursuant to the ATM Program.</P>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Investing in our securities involves a high
degree of risk. You should carefully consider the risks described under &ldquo;Risk Factors&rdquo; on page S-10 of the ATM Prospectus
Supplement and the prospectus contained in the Form S-3, any related free writing prospectus and other information contained or incorporated
by reference in this Supplement No. 1 and the accompanying prospectus, before making a decision to invest in our securities.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>The purpose of this Supplement No. 1 is to
terminate our continuous offering under the ATM Prospectus Supplement and the Sales Agreement.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Neither the Securities and Exchange Commission
nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this Supplement
No. 1, the ATM Prospectus Supplement and the prospectus contained in the Form S-3. Any representation to the contrary is a criminal offense.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>June 12, 2025</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

</BODY>
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