Material Agreement, Private Placement, Amendments to Bylaws (Form 8-K)

Item 1.01 Entry into a Material Definitive Agreement.

Exchange Agreement with Streeterville Capital, LLC

On October 29, 2026, Intrusion Inc. (the "Company"), entered into an Exchange Agreement (the "Exchange Agreement") with Streeterville Capital, LLC ("Streeterville").

Pursuant to the Exchange Agreement, the Company and Streeterville agreed to (i) partition a new secured promissory note in the original principal amount of $3,250,000.00 (the "Note #1 Partitioned Note") from that certain Secured Promissory Note dated April 6, 2026 (reducing the remaining balance on such note to $704,401.02), and (ii) partition a new secured promissory note in the original principal amount of $750,000.00 (the "Note #2 Partitioned Note," and together with the Note #1 Partitioned Note, the "Partitioned Notes") from that certain Secured Promissory Note dated August 28, 2026 (reducing the remaining balance on such note to $884,267.86).

The Exchange Agreement provides for the exchange of the Partitioned Notes (representing $4,000,000.00 in aggregate principal debt) for 4,000 shares of the Company's newly designated Series B Preferred Stock, par value $0.01 per share and stated value of $1,100.00 per share (the "Series B Preferred Stock"), consisting of 3,250 shares issued for the Note #1 Partitioned Note and 750 shares issued for the Note #2 Partitioned Note. Upon issuance of the Series B Preferred Stock and surrender of the Partitioned Notes, the Partitioned Notes will be fully cancelled and extinguished. Other than the surrender and cancellation of the Partitioned Notes, no monetary consideration was exchanged in connection with the Exchange Agreement.

The foregoing description of the Exchange Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Exchange Agreement, a copy of which is filed herewith as Exhibit 10.1 and is incorporated herein by reference.

Item 3.02 Unregistered Sales of Equity Securities.

The information set forth in Item 1.01 of this Current Report on Form 8-K is incorporated herein by reference.

The issuance of the 4,000 shares of Series B Preferred Stock to Streeterville pursuant to the Exchange Agreement is being made in reliance upon the exemption from registration provided by Section 3(a)(9) of the Securities Act of 1933, as amended (the "Securities Act"), on the basis that the exchange is being made with an existing security holder where no commission or other remuneration is paid or given directly or indirectly for soliciting such exchange.

Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On October 29, 2026, the Company filed a Certificate of Designations of Preferences and Rights of Series B Preferred Stock with the Secretary of State of the State of Delaware, designating 10,000 shares of the Company's authorized preferred stock as Series B Preferred Stock, par value $0.01 per share and Stated Value of $1,100.00 per share.

The Series B Preferred Stock is non-voting (except as required by law or as to specified amendments affecting the series), non-convertible into Common Stock, and ranks senior to Common Stock as to dividends, distributions, and payments upon liquidation. The Series B Preferred Stock accrues a 10% per annum preferred return on Stated Value (payable quarterly in cash or additional Series B shares at the Company's election) and an automatic quarterly dividend beginning on the one-year anniversary of issuance. The Certificate of Designations contains protective covenants restricting the Company from incurring debt, issuing equity securities, completing reverse splits (other than for Nasdaq compliance), or effecting fundamental transactions without majority consent of the Series B Preferred Stock. The Company may redeem the Series B Preferred Stock at any time at the Series B Preferred Liquidation Amount.

A copy of the Certificate of Designations is attached hereto as Exhibit 3.1 and is incorporated herein by reference.