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Buy Day today: Good (62) Broad market participation · no major macro event
MEC

Mayville Engineering Co Inc

Industrials · Metal Fabrication

17.40$ +0.7% vs. previous close Closing price · As of: Sep 17, 2026

Ownership

Ownership Structure

Who owns Mayville Engineering Co Inc (MEC)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 72.0% of the shares are freely tradable; institutional investors hold 60.8%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 60.8%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 23.5%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 72.0%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 9.0%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 26Mio.

Largest Shareholders

Institutions

Institutions MEC
Name Stake (%) Shares Change (%) Date
Allspring Global Investments Holdings, LLC 4.21 1,072,916 -46.4 06/30/2026
BlackRock Inc 3.46 881,854 +1.9 03/31/2026
Portolan Capital Management, LLC 3.22 821,136 +60.1 03/31/2026
Dimensional Fund Advisors, Inc. 3.07 782,276 -15.5 06/30/2026
Royce & Associates, LP 2.95 751,001 +20.3 03/31/2026
Arnhold & S. Bleichroeder Advisers, LLC 2.90 739,150 +82.9 06/30/2026
Boston Partners Global Investors, Inc 2.73 696,429 +199.4 06/30/2026
EVR Research LP 2.43 620,000 +2.5 03/31/2026
Vanguard Capital Management, LLC 2.33 594,938 +0.0 03/31/2026

Funds

Funds MEC
Name Stake (%) Shares Change (%) Date
Fidelity Growth Strategies 5.16 1,316,300 +46.4 07/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Insider holdings

Insider holdings MEC
Person Role Shares Value As of Type
Leuba Sean P SVP, GC & Secretary 6,633 115,414 $ Aug 6, 2026 direct

Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.

Insiders

Insider Transactions

Insider Transactions
Date Person Role Type Shares Price Value
Aug 6, 2026 Leuba Sean P SVP, GC & Secretary Sell 12,855 25.44 327,031

Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →

Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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