Who owns Mayville Engineering Company, Inc.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of MEC from SEC Form 13F filings across 155 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 155 institutions disclosed 21.2M shares of Mayville Engineering Company, Inc. worth $790.6M — about 93% of shares outstanding; the largest disclosed holder is Portolan Capital Management, LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
155
13F holders
$790.6M
value, 2026 filers
93%
of shares outstanding (21.2M sh)
54
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of MEC's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Portolan Capital Management, LLC | 1.3M | $48.7M | 1.8% | 5.7% | +58.2% |
| 2 | FMR LLC | 1.3M | $48.0M | 0.0% | 5.6% | +29943.9% |
| 3 | BlackRock, Inc. | 1.2M | $44.3M | 0.0% | 5.2% | +34.2% |
| 4 | Allspring Global Investments Holdings, LLC | 1.1M | $37.8M | 0.1% | 4.7% | -46.4% |
| 5 | Driehaus Capital Management LLCNEW | 846,354 | $31.7M | 0.2% | 3.7% | new |
| 6 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLCNEW | 800,000 | $30.0M | 0.5% | 3.5% | new |
| 7 | DIMENSIONAL FUND ADVISORS LP | 782,276 | $29.3M | 0.0% | 3.4% | -15.5% |
| 8 | ROYCE & ASSOCIATES LP | 752,083 | $28.2M | 0.2% | 3.3% | +0.1% |
| 9 | VANGUARD CAPITAL MANAGEMENT LLC | 743,621 | $27.9M | 0.0% | 3.3% | +25.0% |
| 10 | Boston Partners | 696,429 | $25.8M | 0.0% | 3.1% | +199.4% |
| 11 | Jupiter Topco LLCNEW | 575,278 | $21.5M | 0.0% | 2.5% | new |
| 12 | BLAIR WILLIAM & CO/IL | 546,714 | $20.5M | 0.1% | 2.4% | -3.3% |
| 13 | WELLINGTON MANAGEMENT GROUP LLPNEW | 477,583 | $17.9M | 0.0% | 2.1% | new |
| 14 | EVR Research LP | 441,908 | $16.6M | 8.2% | 1.9% | -28.7% |
| 15 | GEODE CAPITAL MANAGEMENT, LLC | 374,578 | $14.0M | 0.0% | 1.6% | +11.5% |
| 16 | First Eagle Investment Management, LLC | 369,575 | $13.8M | 0.0% | 1.6% | -8.5% |
| 17 | JANE STREET GROUP, LLCNEW | 356,151 | $13.3M | 0.0% | 1.6% | new |
| 18 | JPMORGAN CHASE & CO | 347,224 | $13.0M | 0.0% | 1.5% | +6235.0% |
| 19 | KENNEDY CAPITAL MANAGEMENT LLC | 336,377 | $12.6M | 0.2% | 1.5% | +215.0% |
| 20 | Ophir Asset Management Pty LtdNEW | 326,699 | $12.2M | 1.0% | 1.4% | new |
| 21 | Granahan Investment Management, LLC | 324,108 | $12.1M | 0.4% | 1.4% | -16.4% |
| 22 | SILVERCREST ASSET MANAGEMENT GROUP LLC | 313,943 | $11.8M | 0.1% | 1.4% | +16.4% |
| 23 | STATE STREET CORP | 291,168 | $10.9M | 0.0% | 1.3% | +1.9% |
| 24 | Nuveen, LLC | 281,914 | $10.6M | 0.0% | 1.2% | +494.5% |
| 25 | BANK OF AMERICA CORP /DE/ | 276,317 | $10.4M | 0.0% | 1.2% | +50.5% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.