Was the Mayville Engineering (MEC) CEO’s share sale made under a Rule 10b5-1 plan?

Yes. The filing states the transaction was effected under a Rule 10b5-1 trading plan adopted on December 12, 2025. Such plans pre-schedule trades, indicating the timing of this June 1, 2026 sale was arranged in advance.

Mayville Engineering (MEC) CEO sells 17,942 shares in pre-set 10b5-1 trade

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Mayville Engineering Company, Inc. President & CEO Jagadeesh A. Reddy reported an open-market sale of 17,942 shares of common stock at a weighted average price of $30.0001 per share on June 1, 2026. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 12, 2025, indicating it was scheduled in advance. Following this transaction, he directly holds 140,445 common shares and also has stock options for 88,901 shares at an exercise price of $16.22 plus multiple restricted stock unit grants tied to future vesting dates.

Insights

CEO’s pre-planned share sale is modest relative to his remaining equity position.

Mayville Engineering’s President & CEO Jagadeesh A. Reddy sold 17,942 common shares at a weighted average of $30.0001 on June 1, 2026. The filing notes this was done under a Rule 10b5-1 trading plan adopted on December 12, 2025, signaling a pre-scheduled, programmatic sale rather than a discretionary trade.

After the sale, he still directly owns 140,445 common shares and retains significant equity-linked incentives: options over 88,901 shares at an exercise price of $16.22 and several restricted stock unit awards totaling more than 160,000 underlying shares, each with multi-year vesting schedules. This suggests his overall exposure to the company’s equity remains substantial.

The combination of a pre-arranged trading plan and sizeable remaining holdings makes this look like routine portfolio and liquidity management rather than a thesis-changing move. Future company filings around the vesting dates in 2025, 2026, 2027, 2028 and 2029 may show how these RSU grants convert into common stock over time.

Insider Trade Summary 10b5-1

Net Seller: 17,942 shares ($538,262)

Net Sell 7 txns

Insider Reddy Jagadeesh A

Role President & CEO

Sold 17,942 shs ($538K)

Type	Security	Shares	Price	Value
Sale	Common Stock	17,942	$30.0001	$538K
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Stock Option (right to buy)	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 140,445 shares (Direct, null); Restricted Stock Units — 36,317 shares (Direct, null); Stock Option (right to buy) — 88,901 shares (Direct, null); Common Stock — 2,300 shares (Indirect, by ESOP and/or 401(k) Plan)

Footnotes (1)

The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 12, 2025. The price in Column 4 is a weighted average price. The prices actually received ranged from $30.00 to $30.01. The reporting person has provided to the issuer, and will provide to any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range for all transactions reported in this Form 4 utilizing a weighted average price. Reflects the most recent ESOP and 401(k) balance. The restricted stock units will vest 1/3 on each of March 15, 2025, 2026 and 2027. The restricted stock units will vest 1/3 on each of March 15, 2026, 2027 and 2028. The restricted stock units will vest 1/3 on each of March 15, 2027, 2028 and 2029. The options will vest 50% on each of February 28, 2024 and February 28, 2025.

Key Figures

Shares sold: 17,942 shares Weighted average sale price: $30.0001 per share Direct holdings after sale: 140,445 shares +5 more

8 metrics

Shares sold 17,942 shares Open-market sale of common stock on June 1, 2026

Weighted average sale price $30.0001 per share Common stock sale on June 1, 2026; prices ranged $30.00–$30.01

Direct holdings after sale 140,445 shares Common stock directly owned by CEO following transaction

Stock options underlying shares 88,901 shares Options with $16.22 exercise price, direct ownership

Option exercise price $16.22 per share Stock Option (right to buy) held by CEO

RSU grant 1 underlying shares 74,986 shares Restricted Stock Units vesting 1/3 on March 15, 2025–2027

RSU grant 2 underlying shares 55,284 shares Restricted Stock Units vesting 1/3 on March 15, 2026–2028

RSU grant 3 underlying shares 36,317 shares Restricted Stock Units vesting 1/3 on March 15, 2027–2029

Key Terms

Rule 10b5-1 trading plan, weighted average price, Restricted Stock Units, Stock Option (right to buy), +1 more

5 terms

Rule 10b5-1 trading plan regulatory

"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 12, 2025."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price in Column 4 is a weighted average price. The prices actually received ranged from $30.00 to $30.01."

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 Units financial

"The restricted stock units will vest 1/3 on each of March 15, 2025, 2026 and 2027."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Stock Option (right to buy) financial

"The options will vest 50% on each of February 28, 2024 and February 28, 2025."

ESOP and 401(k) Plan financial

"Reflects the most recent ESOP and 401(k) balance."

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Form 4 Insider Transactions: What Each Field Means →

06/02/2026 - 05:49 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^*

Reddy Jagadeesh A

(Last)

(First)

(Middle)

135 SOUTH 84TH STREET

SUITE 300

(Street)

MILWAUKEE

WISCONSIN

53214

(City)

(State)

(Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Mayville Engineering Company, Inc. [ MEC ]

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

X	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	President & CEO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

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	06/01/2026		S⁽¹⁾		17,942	D	$30.0001⁽²⁾	140,445	D
Common Stock								2,300⁽³⁾	I	by ESOP and/or 401(k) Plan
Common Stock								380	I	By Daughter

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)
Restricted Stock Units	$0							⁽⁴⁾	⁽⁴⁾	Common Shares	36,317		36,317	D
Restricted Stock Units	$0							⁽⁵⁾	⁽⁵⁾	Common Shares	55,284		55,284	D
Restricted Stock Units	$0							⁽⁶⁾	⁽⁶⁾	Common Shares	74,986		74,986	D
Stock Option (right to buy)	$16.22							⁽⁷⁾	⁽⁷⁾	Common Shares	88,901		88,901	D

Explanation of Responses:

1. The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 12, 2025.

2. The price in Column 4 is a weighted average price. The prices actually received ranged from $30.00 to $30.01. The reporting person has provided to the issuer, and will provide to any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range for all transactions reported in this Form 4 utilizing a weighted average price.

3. Reflects the most recent ESOP and 401(k) balance.

4. The restricted stock units will vest 1/3 on each of March 15, 2025, 2026 and 2027.

5. The restricted stock units will vest 1/3 on each of March 15, 2026, 2027 and 2028.

6. The restricted stock units will vest 1/3 on each of March 15, 2027, 2028 and 2029.

7. The options will vest 50% on each of February 28, 2024 and February 28, 2025.

	/s/ Garrett F. Bishop, Attorney-in-Fact for Jagadeesh A. Reddy	06/02/2026
	** 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

FAQ

How many Mayville Engineering (MEC) shares did the CEO sell in this Form 4?

The CEO sold 17,942 shares of Mayville Engineering common stock. These were open-market sales at a weighted average price of about $30.0001 per share, as disclosed in the Form 4 insider trading report.

At what price did Mayville Engineering (MEC) shares sell in the CEO’s June 1, 2026 transaction?

The reported weighted average sale price was $30.0001 per share. A footnote explains individual trade prices ranged from $30.00 to $30.01, and detailed trade breakdowns are available from the issuer or the CEO upon request.

How many Mayville Engineering (MEC) shares does the CEO own after this Form 4 transaction?

Following the reported sale, the CEO directly owns 140,445 shares of Mayville Engineering common stock. This direct holding is in addition to his stock options and multiple restricted stock unit awards referenced in the filing.

What stock options does the Mayville Engineering (MEC) CEO hold according to this Form 4?

The CEO holds options covering 88,901 underlying common shares with an exercise price of $16.22 per share. A footnote notes these options vest in two tranches, 50% on each of February 28, 2024 and February 28, 2025.

What restricted stock units (RSUs) are reported for the Mayville Engineering (MEC) CEO?

The filing lists several RSU awards with 74,986, 55,284, and 36,317 underlying common shares. Footnotes explain they vest in equal one-third installments on March 15 across years including 2025, 2026, 2027, 2028, and 2029.