RABER RYAN F (EVP - Sales & Marketing) sold 18.7% of their position (20K shares) of MAYVILLE ENGINEERING COMPANY, INC. on the open market

Open‑market sale worth $520.0K — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

RABER RYAN F

Filed: 5/27/2026ACC: 0000897069-26-001261

InsiderRABER RYAN FCIK 1775978

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IssuerMAYVILLE ENGINEERING COMPANY, INC.CIK 1766368

Officer· EVP - Sales & Marketing

Since May 2019

-20K

Net shares

Net seller

$520.0K

Total sold

Open market trades

0B · 1S

Total transactions

20K disposed

Non-Derivative Transactions1

Common Stock

Direct

S · Sale

−20K

Price / share

$26.00

Trade value

$520K

% of position

18.7%

5/26/2026

106.97K→86.97K

Total

Net shares

−20K

Net value

-$520K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	5/26/2026	S · Sale	−20K	$26.00	$520K	18.7%	106.97K	86.97K
Total			−20K		-$520K

Derivative Transactions0

No derivative transactions reported

Non-Derivative Holdings (Post-Transaction)1

Common Stock

Indirect

Shares owned26.29K

Total

26.29K indirect26.29K

Security Title	Shares Owned	Ownership Type
Common Stock	26.29K	Indirect
Total	26.29K	26.29K indirect

Derivative Holdings (Post-Transaction)7

Stock Option (right to buy)

Direct

Underlying security

Common Stock

Underlying shares

77.43K

Shares owned

77.43K

Exercise price

10.32

Expiration

—

Exercise window

—

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

17.65K

Shares owned

17.65K

Exercise price

Expiration

—

Exercise window

—

Stock Option (right to buy)

Direct

Underlying security

Common Stock

Underlying shares

43.29K

Shares owned

43.29K

Exercise price

14.01

Expiration

—

Exercise window

—

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

12.45K

Shares owned

12.45K

Exercise price

Expiration

—

Exercise window

—

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

29.16K

Shares owned

29.16K

Exercise price

Expiration

—

Exercise window

—

Stock Option (right to buy)

Direct

Underlying security

Common Stock

Underlying shares

44.72K

Shares owned

44.72K

Exercise price

16.22

Expiration

—

Exercise window

—

Stock Option (right to buy)

Direct

Underlying security

Common Stock

Underlying shares

27.59K

Shares owned

27.59K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

252.29K

Owned

252.29K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Stock Option (right to buy) Direct	Common Stock	10.32	—	—	77.43K	77.43K
Restricted Stock Units Direct	Common Stock	0	—	—	17.65K	17.65K
Stock Option (right to buy) Direct	Common Stock	14.01	—	—	43.29K	43.29K
Restricted Stock Units Direct	Common Stock	0	—	—	12.45K	12.45K
Restricted Stock Units Direct	Common Stock	0	—	—	29.16K	29.16K
Stock Option (right to buy) Direct	Common Stock	16.22	—	—	44.72K	44.72K
Stock Option (right to buy) Direct	Common Stock	17	—	—	27.59K	27.59K
Total					252.29K	252.29K