MPTI · M-tron Industries, Inc. · Insider Trading

Represents shares sold to cover tax withholding obligations in connection with the vesting of a restricted stock award.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.62 to $85.44, inclusive. The shares were sold pursuant to Rule 144 under the Securities Act of 1933, as amended, and a Form 144 was filed in connection with such sale. The reporting person undertakes to provide to the Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Shares were sold to satisfy tax withholding obligations in connection with the vesting of 1,029 shares of restricted stock on April 30, 2026.

Shares were sold to satisfy tax withholding obligations in connection with the vesting of 2,823 shares of restricted stock on April 30, 2026.

Shares were sold to satisfy tax withholding obligations in connection with the vesting of 1,214 shares of restricted stock on April 30, 2026.

The shares shown in this line are the additional shares purchased pursuant to the Over-Subscription Privilege.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

The original Form 4, filed on April 16, 2026, is being amended by this Form 4/A solely to add a sale of the Rights in Table II on April 9, 2026, which was inadvertently omitted from the original filing. As a result of that omission, the amount of securities beneficially owned following the transaction reported on Line 3 of Table II has also been corrected to reflect the accurate, adjusted ending balance.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share. Each Rightsholder who was a stockholder of record could also elect to purchase additional shares of Common Stock at the subscription price if other Rightsholders did not fully exercise their Rights and the Rightsholders exercised in full their basic Rights (the "Over-Subscription Privilege").

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share. Each Rightsholder who was a stockholder of record could also elect to purchase additional shares of Common Stock at the subscription price if other Rightsholders did not fully exercise their Rights and the Rightsholders exercised in full their basic Rights (the "Over-Subscription Privilege").

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

The original Form 4, filed on April 16, 2026, is being amended by this Form 4/A solely to add a sale of the Rights in Table II on April 9, 2026, which was inadvertently omitted from the original filing. As a result of that omission, the amount of securities beneficially owned following the transaction reported on Line 3 of Table II has also been corrected to reflect the accurate, adjusted ending balance.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

On March 30, 2026, holders of the Issuer's common stock, par value $0.01 per share (the "Common Stock"), received one subscription right (the "Rights") for each share of Common Stock held by such holder as of March 27, 2026. When exercisable, five (5) Rights will entitle their holder to purchase one share of Common Stock at an exercise price of $59.00 per share.

Restricted shares, subject to the following vesting: 1,029 shares on 4/30/2026 and 1,030 on 4/30/2027.

Restricted shares, subject to the following vesting: 2,823 shares on 4/30/2026 and 2,823 shares on 4/30/2027.

Restricted shares, subject to the following vesting: 1,214 shares on 4/30/2026 and 1,214 shares on 4/30/2027.

Annual stock grant to non-employee director.

Restricted shares, subject to vesting 852 shares on 3/19/2027, 852 shares on 3/19/2028, 1,136 shares on 3/19/2029.

Restricted shares, subject to vesting 470 shares on 3/19/2027, 470 shares on 3/19/2028, 625 shares on 3/19/2028.

Annual stock grant to non-employee director.

Annual stock grant to non-employee director.

Restricted shares, subject to vesting 1,142 shares on 3/19/2027, 1,142 shares on 3/19/2028, 1,522 shares on 3/19/2029.

Annual stock grant to non-employee director.

Annual stock grant to non-employee director.

Annual stock grant to non-employee director.

Annual stock grant to non-employee director.

On April 25, 2025, holders of the Issuer's Common Stock, par value $0.01 per share (the "Common Stock"), received a dividend of one Common Stock Warrant (the "Warrants") for each share of Common Stock held by such holder as of March 10, 2025. When exercisable, five (5) Warrants will entitle their holder to purchase one share of Common Stock at an exercise price of $47.50 per share, as may be adjusted in accordance with the terms of the Warrants. Each warrant holder could also elect to purchase additional shares of Common Stock at the exercise price if other warrant holders did not fully exercise their warrants and the warrant holder exercised in full their basic warrants (the "Over-Subscription Privilege"). The shares shown on this Form 4 are the additional shares purchased pursuant to the Over-Subscription Privilege, the amount of which was not determinable prior to the closing of the warrant offering.

On April 25, 2025, holders of the Issuer's Common Stock, par value $0.01 per share (the "Common Stock"), received a dividend of one Common Stock Warrant (the "Warrants") for each share of Common Stock held by such holder as of March 10, 2025. When exercisable, five (5) Warrants will entitle their holder to purchase one share of Common Stock at an exercise price of $47.50 per share, as may be adjusted in accordance with the terms of the Warrants.

On April 25, 2025, holders of the Issuer's Common Stock, par value $0.01 per share (the "Common Stock"), received a dividend of one Common Stock Warrant (the "Warrants") for each share of Common Stock held by such holder as of March 10, 2025. When exercisable, five (5) Warrants will entitle their holder to purchase one share of Common Stock at an exercise price of $47.50 per share, as may be adjusted in accordance with the terms of the Warrants.

On April 25, 2025, holders of the Issuer's Common Stock, par value $0.01 per share (the "Common Stock"), received a dividend of one Common Stock Warrant (the "Warrants") for each share of Common Stock held by such holder as of March 10, 2025. When exercisable, five (5) Warrants will entitle their holder to purchase one share of Common Stock at an exercise price of $47.50 per share, as may be adjusted in accordance with the terms of the Warrants.

On April 25, 2025, holders of the Issuer's Common Stock, par value $0.01 per share (the "Common Stock"), received a dividend of one Common Stock Warrant (the "Warrants") for each share of Common Stock held by such holder as of March 10, 2025. When exercisable, five (5) Warrants will entitle their holder to purchase one share of Common Stock at an exercise price of $47.50 per share, as may be adjusted in accordance with the terms of the Warrants.

On April 25, 2025, holders of the Issuer's Common Stock, par value $0.01 per share (the "Common Stock"), received a dividend of one Common Stock Warrant (the "Warrants") for each share of Common Stock held by such holder as of March 10, 2025. When exercisable, five (5) Warrants will entitle their holder to purchase one share of Common Stock at an exercise price of $47.50 per share, as may be adjusted in accordance with the terms of the Warrants.

On April 25, 2025, holders of the Issuer's Common Stock, par value $0.01 per share (the "Common Stock"), received a dividend of one Common Stock Warrant (the "Warrants") for each share of Common Stock held by such holder as of March 10, 2025. When exercisable, five (5) Warrants will entitle their holder to purchase one share of Common Stock at an exercise price of $47.50 per share, as may be adjusted in accordance with the terms of the Warrants.