Mayville Engineering 401(k) and pension plans

Mayville Engineering Company, Inc, Milwaukee, WI. EIN 39-0944729. Annual reports 2009–2025. Also filed as Mayville Engineering Company, Inc.; Mayville Engineering Company; Mayville Engineering Company Inc.

Mayville Engineering Company, Inc has 2 active retirement plans on file. The largest is the Mayville Engineering Company, Inc. 401(k) Plan, with 2,852 participants and $184 million in assets in 2025. Principal has been its recordkeeper since 2020.

Active plans: 2
Participants: 4,947
Plan assets: $220 million
401(k) recordkeeper: Principal
Plans on file: 4
Industry: Manufacturing

All 4 plans

Active plans first

Mayville Engineering Company, Inc. 401(k) Plan

401(k)Active

Active. The plan filed its annual report for the 2025 plan year.

Plan number: 003Employer EIN 39-0944729
Participants (2025): 2,852
Net assets (2025): $184 million
Recordkeeper: PrincipalEarlier: Wells Fargo (2011–2019), Empower (2009–2010)
Plan administrator: Mayville Engineering Company, Inc
135 S. 84TH Street, Suite 300
Milwaukee, WI 53214
(414) 381-2860As filed for 2025
In effect since: June 1, 1990

Plans merged into this one: Mayville Engineering Company, Inc. Employee Stock Ownership Plan for Safe Harbor Shares (2019).

Earlier plan names: Mayville Engineering Company, Inc. 401K Plan.

Year by year, 2009 to 2025

Plan year	Participants	Net assets	Recordkeeper
2025	2,852	$184 million	Principal
2024	2,714	$156 million	Principal
2023	3,045	$150 million	Principal
2022	2,957	$118 million	Principal
2021	2,645	$130 million	Principal
2020	2,540	$118 million	Principal
2019	4,263	$106 million	Wells Fargo
2018	2,551	$51.9 million	Wells Fargo
2017	2,136	$57.3 million	Wells Fargo
2016	2,085	$48.7 million	Wells Fargo
2015	1,989	$45.3 million	Wells Fargo
2014	2,059	$46.8 million	Wells Fargo
2013	1,877	$43.0 million	Wells Fargo
2012	1,166	$33.5 million	Wells Fargo
2011	1,044	$27.7 million	Wells Fargo
2010	1,025	$25.9 million	Empower
2009	831	$21.1 million	Empower

Mayville Engineering Company, Inc. Employee Stock Ownership Plan

Employee stock ownership plan (ESOP)Active

Active. The plan filed its annual report for the 2025 plan year.

Plan number: 001Employer EIN 39-0944729
Participants (2025): 2,095
Net assets (2025): $35.6 million
Plan administrator: Mayville Engineering Company, Inc.
715 South Street
Mayville, WI 53050
(920) 387-4500As filed for 2025
In effect since: May 20, 1959

Earlier plan names: Mayville Engineering Company, Inc Employee Stock Ownership Plan; Mayville Engineering Company, Inc..

Year by year, 2009 to 2025

Plan year	Participants	Net assets	Recordkeeper
2025	2,095	$35.6 million	not listed
2024	2,315	$54.6 million	not listed
2023	2,328	$58.6 million	not listed
2022	2,685	$72.0 million	not listed
2021	2,831	$109 million	not listed
2020	3,194	$111 million	not listed
2019	3,568	$88.3 million	not listed
2018	2,996	$135 million	not listed
2017	2,817	$126 million	not listed
2016	2,633	$122 million	not listed
2015	2,528	$125 million	not listed
2014	2,334	$122 million	not listed
2013	2,041	$106 million	not listed
2012	1,225	$85.3 million	not listed
2011	1,137	$70.3 million	not listed
2010	1,003	$57.2 million	not listed
2009	767	$45.7 million	not listed

Mayville Engineering Company, Inc. Employee Stock Ownership Plan for Safe Harbor Shares

Employee stock ownership plan (ESOP)Merged

Merged. In 2019 its assets moved to the Mayville Engineering Company, Inc 401(k) Retirement Savings Plan, sponsored by Mayville Engineering Company, Inc (EIN 39-0944729, plan 003). Accounts moved with them, so that plan is the one to contact.

Plan number: 004Employer EIN 39-0944729
Plan administrator: Mayville Engineering Company, Inc.
715 South Street
Mayville, WI 53050
(920) 387-4500As filed for 2019
In effect since: May 13, 2019

Mayville Engineering Company, Inc. Defined Benefit Plan

Pension (defined benefit), frozenClosed

Closed. The plan filed its final annual report for 2012, which means its assets were paid out or moved and it no longer exists.

Plan number: 002Employer EIN 39-0944729
Participants (2011): 621
Net assets (2011): $11.9 million
Administered by: Emjay2009–2011
Plan administrator: Mayville Engineering Company, Inc.
715 South Street
Mayville, WI 53050
(920) 387-4500As filed for 2012
In effect since: July 1, 1973

Year by year, 2009 to 2012

Plan year	Participants	Net assets	Recordkeeper
2012	0	$0	not listed
2011	621	$11.9 million	Emjay
2010	631	$11.8 million	Emjay
2009	636	$10.3 million	Emjay

If you had money in one of these plans

Call Principal (principal.com), which runs the Mayville Engineering Company, Inc. 401(k) Plan. With your Social Security number and the plan name, it can tell you whether you still have a balance and, if not, where it went.
Or call the plan administrator listed on the plan below ((414) 381-2860). That number was filed for 2025; ask for the benefits or retirement plan office.
If your plan was merged, your account moved with it. Follow the link on the plan to the plan it went into, and contact that one.
If your plan closed, unclaimed balances usually went to an IRA in your name, to the PBGC's missing participants program, or to state unclaimed property. Here is how to check each one.
Still stuck? The Department of Labor's benefits advisers help for free: askebsa.dol.gov or 1-866-444-3272. Never pay anyone to find your own money.

What these numbers are

They come from the Form 5500 annual reports each plan files with the Department of Labor, as the plan filed them. A plan year is usually a calendar year.
Participants counts everyone in the plan at year end: current employees, former employees who still have a balance or a pension coming, and retirees or beneficiaries being paid.
The recordkeeper is the service provider whose Schedule C entry says it keeps the plan's records. Small plans do not file Schedule C, so some plans show none.
We cannot see anyone's account. Only the plan or its recordkeeper can tell you your balance.

Sources: U.S. Department of Labor, Form 5500 datasets and PBGC trusteed plans. How we read them.