M-tron Industries (MPTI) EVP sells shares to cover taxes after vesting

Rhea-AI Filing Summary

M-tron Industries Executive VP of Finance Linda M. Biles reported a small tax-related share sale. On May 4, 2026, she sold 306 shares of common stock at $66.78 per share to satisfy tax withholding obligations tied to the vesting of 1,029 restricted shares on April 30, 2026. After the sale, she directly holds 28,376 common shares. She also holds a stock option covering 10,000 common shares at an exercise price of $40.32 per share, expiring on April 4, 2030, vesting 30% on April 4, 2026, 30% on April 4, 2027, and 40% on April 4, 2028.

Insider Trade Summary

Net Seller: 306 shares ($20,435)

Net Sell 2 txns

Insider Biles Linda M

Role Executive VP - Finance

Sold 306 shs ($20K)

Type	Security	Shares	Price	Value
Sale	Common Stock	306	$66.78	$20K
holding	Stock Option (right to buy)	--	--	--

Holdings After Transaction: Common Stock — 28,376 shares (Direct, null); Stock Option (right to buy) — 10,000 shares (Direct, null)

Footnotes (1)

1. Shares were sold to satisfy tax withholding obligations in connection with the vesting of 1,029 shares of restricted stock on April 30, 2026. Stock options of the Issuer vesting as follows: 30% on 4/4/2026, 30% on 4/4/2027, and 40% on 4/4/2028.

Key Figures

Shares sold: 306 shares Sale price: $66.78 per share Shares held after sale: 28,376 shares +4 more

7 metrics

Shares sold 306 shares Common stock sold on May 4, 2026

Sale price $66.78 per share Price for 306 common shares sold

Shares held after sale 28,376 shares Common stock directly owned after transaction

Option underlying shares 10,000 shares Common shares underlying stock option

Option exercise price $40.32 per share Stock option strike price

Option expiration April 4, 2030 Stock option expiration date

Restricted shares vested 1,029 shares Restricted stock vested on April 30, 2026

Key Terms

restricted stock, tax withholding obligations, stock option, vesting

4 terms

restricted stock financial

"vesting of 1,029 shares of restricted stock on April 30, 2026"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

tax withholding obligations financial

"Shares were sold to satisfy tax withholding obligations in connection with the vesting"

stock option financial

"Stock options of the Issuer vesting as follows: 30% on 4/4/2026"

A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.

vesting financial

"Stock options of the Issuer vesting as follows: 30% on 4/4/2026"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Biles Linda M

(Last) (First) (Middle)

2525 SHADER RD

(Street)

ORLANDO FLORIDA 32804

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
M-tron Industries, Inc. [ MPTI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive VP - Finance

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/04/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/04/2026		S		306(1)	D	$66.78	28,376	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	$40.32							04/04/2026(2)	04/04/2030	Common Stock	10,000		10,000	D

Explanation of Responses:

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

2. Stock options of the Issuer vesting as follows: 30% on 4/4/2026, 30% on 4/4/2027, and 40% on 4/4/2028.

	/s/ Linda M. Biles	05/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did M-tron Industries (MPTI) report for Linda M. Biles?

M-tron Industries reported that Executive VP of Finance Linda M. Biles sold 306 common shares at $66.78 per share. The sale was specifically to cover tax withholding obligations from recently vested restricted stock, rather than a discretionary portfolio decision.

Why did Linda M. Biles sell 306 MPTI shares on May 4, 2026?

Linda M. Biles sold 306 M-tron Industries shares to satisfy tax withholding obligations connected to the vesting of 1,029 restricted shares on April 30, 2026. This indicates a compensation-related, mechanistic sale instead of a typical open-market liquidation.

How many M-tron Industries shares does Linda M. Biles hold after the reported sale?

After selling 306 shares, Linda M. Biles directly holds 28,376 shares of M-tron Industries common stock. This shows she retained a substantial equity position following the tax-related disposition linked to her restricted stock vesting.

What stock options does Linda M. Biles hold in M-tron Industries (MPTI)?

Linda M. Biles holds a stock option covering 10,000 common shares at an exercise price of $40.32 per share. The option expires on April 4, 2030 and vests 30% in 2026, 30% in 2027, and 40% in 2028.

What restricted stock vesting triggered the tax-related share sale at M-tron Industries?

The tax-related sale was triggered by the vesting of 1,029 shares of restricted stock on April 30, 2026. To meet associated tax withholding obligations, Linda M. Biles sold 306 common shares on May 4, 2026 at $66.78 per share.