Was the MPTI insider sale by Linda Biles related to tax withholding on equity awards?

Yes. The 1,218 MPTI shares were sold to cover tax withholding obligations arising from the vesting of a restricted stock award. This indicates the transaction was driven by tax requirements tied to equity compensation vesting.

Was Linda Biles’s MPTI share sale executed under Rule 144?

Yes. The filing states the shares were sold pursuant to Rule 144 under the Securities Act of 1933. A corresponding Form 144 was filed, and the insider offers to provide detailed trade breakdowns upon request.

M-tron EVP sells 1,218 shares for tax withholding

Q: What insider transaction did MPTI executive Linda M. Biles report on this Form 4?

Linda M. Biles reported selling 1,218 MPTI shares on 2026-08-11. The sale covered tax withholding obligations from a restricted stock vesting, at a $85.05 weighted average price with trades from $84.62 to $85.44 under Rule 144.

Q: At what price were the MPTI shares sold in Linda Biles’s reported transaction?

The reported weighted average sale price was $85.05 per MPTI share. Individual trades occurred in multiple transactions, with prices ranging from $84.62 to $85.44, all executed pursuant to Rule 144 under the Securities Act of 1933.

Q: How many MPTI shares does Linda M. Biles own after this Form 4 transaction?

After the reported sale, Linda M. Biles directly owns 28,723 MPTI common shares. In addition, she holds a stock option over 10,000 underlying shares that remains outstanding, providing further potential equity exposure to M-tron Industries, Inc.

Q: What stock options on MPTI shares does Linda M. Biles hold according to this filing?

She holds a stock option for 10,000 MPTI shares at a $40.32 exercise price, expiring on 2030-04-04. The option vests in tranches: 30% on 2026-04-04, 30% on 2027-04-04, and 40% on 2028-04-04.

M-tron Industries, Inc. (MPTI) reported that Executive VP - Finance Linda M. Biles sold 1,218 shares of common stock on 2026-08-11 to cover tax withholding obligations related to the vesting of a restricted stock award.

Filing Impact

(Moderate)

Filing Sentiment

(Negative)How Sentiment works

Sentiment and the balance of points

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Form Type

Rhea-AI Filing Summary

M-tron Industries, Inc. (MPTI) reported that Executive VP - Finance Linda M. Biles sold 1,218 shares of common stock on 2026-08-11 to cover tax withholding obligations related to the vesting of a restricted stock award. The weighted average sale price was $85.05 per share, with individual trades executed between $84.62 and $85.44 under Rule 144. Following this transaction, she directly owns 28,723 common shares and holds a stock option for 10,000 shares at an exercise price of $40.32, expiring on 2030-04-04, vesting 30% on 2026-04-04, 30% on 2027-04-04, and 40% on 2028-04-04.

Insider Trade Summary

Net Seller: 1,218 shares

Net Sell 2 txns

Insider Biles Linda M

Role Executive VP - Finance

Sold 1,218 shs ($104K)

Type	Security	Shares	Price	Value
Sale	Common Stock ^{F1, F2}	1,218	$85.05	$104K
holding	Stock Option (right to buy) ^F3	--	--	--

Holdings After Transaction: Common Stock — 28,723 shares (Direct); Stock Option (right to buy) — 10,000 contracts (Direct)

Footnotes (3)

F1. Represents shares sold to cover tax withholding obligations in connection with the vesting of a restricted stock award.
F2. 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.
F3. 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: 1,218 shares Weighted average sale price: $85.05 per share Sale price range: $84.62 to $85.44 per share +5 more

8 metrics

Shares sold 1,218 shares Common stock sold on 2026-08-11 to cover tax withholding obligations

Weighted average sale price $85.05 per share Average price for 1,218 MPTI shares sold on 2026-08-11

Sale price range $84.62 to $85.44 per share Price range of multiple transactions included in the reported sale

Shares owned after transaction 28,723 shares Direct MPTI common stock holdings of Linda M. Biles following the sale

Option underlying shares 10,000 shares Shares underlying stock option (right to buy) held directly

Option exercise price $40.32 per share Exercise price of the 10,000-share stock option

Option expiration date 2030-04-04 Expiration date of the stock option (right to buy) on MPTI shares

Option vesting schedule 30%/30%/40% Vesting 30% on 2026-04-04, 30% on 2027-04-04, 40% on 2028-04-04

Key Terms

Rule 144, weighted average price, restricted stock award, tax withholding obligations, +1 more

5 terms

Rule 144 regulatory

"The shares were sold pursuant to Rule 144 under the Securities Act of 1933"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

weighted average price financial

"The price reported in Column 4 is a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

restricted stock award financial

"in connection with the vesting of a restricted stock award"

A restricted stock award is company shares given to an employee or executive that cannot be sold or fully owned until certain conditions—like staying with the company for a set time or hitting performance targets—are met. Think of it as a gift that only becomes yours after you fulfill specific obligations; for investors, these awards matter because they can increase the total shares outstanding when they vest, reveal how management is being paid and motivated, and create potential selling pressure when restrictions lift.

tax withholding obligations financial

"shares sold to cover tax withholding obligations in connection with the vesting"

Stock Option (right to buy) financial

"Stock Option (right to buy) ... underlying security title: Common Stock"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MPTI executive Linda M. Biles report on this Form 4?

Linda M. Biles reported selling 1,218 MPTI shares on 2026-08-11. The sale covered tax withholding obligations from a restricted stock vesting, at a $85.05 weighted average price with trades from $84.62 to $85.44 under Rule 144.

At what price were the MPTI shares sold in Linda Biles’s reported transaction?

The reported weighted average sale price was $85.05 per MPTI share. Individual trades occurred in multiple transactions, with prices ranging from $84.62 to $85.44, all executed pursuant to Rule 144 under the Securities Act of 1933.

How many MPTI shares does Linda M. Biles own after this Form 4 transaction?

After the reported sale, Linda M. Biles directly owns 28,723 MPTI common shares. In addition, she holds a stock option over 10,000 underlying shares that remains outstanding, providing further potential equity exposure to M-tron Industries, Inc.

What stock options on MPTI shares does Linda M. Biles hold according to this filing?

She holds a stock option for 10,000 MPTI shares at a $40.32 exercise price, expiring on 2030-04-04. The option vests in tranches: 30% on 2026-04-04, 30% on 2027-04-04, and 40% on 2028-04-04.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/19/2026 - 04:33 PM Accepted by SEC EDGAR 08/19/2026 - 04:32 PM

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)
08/11/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	08/11/2026		S		1,218⁽¹⁾	A	$85.05⁽²⁾	28,723	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Option (right to buy)	$40.32							04/04/2026⁽³⁾	04/04/2030	Common Stock	10,000		10,000	D

Explanation of Responses:

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

2. 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.

3. 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	08/19/2026
	** 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)

Source: View Original Filing on SEC EDGAR