Who owns Mayville Engineering Company, Inc.?
Institutional ownership of MEC from SEC Form 13F filings across 105 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.
105
13F holders
$472.8M
value, 2026 filers
61.4%
of shares outstanding (12.9M sh)
36
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 | FMR LLC | 1.3M | $48.0M | 0.0% | 6.1% | +29943.9% |
| 2 | BlackRock, Inc. | 1.2M | $44.3M | 0.0% | 5.6% | +34.2% |
| 3 | Allspring Global Investments Holdings, LLC | 1.1M | $37.8M | 0.1% | 5.1% | -46.4% |
| 4 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLCNEW | 800,000 | $30.0M | 0.5% | 3.8% | new |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 743,621 | $27.9M | 0.0% | 3.5% | -37.5% |
| 6 | Jupiter Topco LLCNEW | 575,278 | $21.5M | 0.0% | 2.7% | new |
| 7 | BLAIR WILLIAM & CO/IL | 546,714 | $20.5M | 0.1% | 2.6% | -3.3% |
| 8 | WELLINGTON MANAGEMENT GROUP LLPNEW | 477,583 | $17.9M | 0.0% | 2.3% | new |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 374,578 | $14.0M | 0.0% | 1.8% | +11.5% |
| 10 | First Eagle Investment Management, LLC | 369,575 | $13.8M | 0.0% | 1.8% | -54.3% |
| 11 | JANE STREET GROUP, LLCNEW | 356,151 | $13.3M | 0.0% | 1.7% | new |
| 12 | JPMORGAN CHASE & CO | 347,224 | $13.0M | 0.0% | 1.7% | +6235.0% |
| 13 | SILVERCREST ASSET MANAGEMENT GROUP LLC | 313,943 | $11.8M | 0.1% | 1.5% | +16.4% |
| 14 | Nuveen, LLC | 281,914 | $10.6M | 0.0% | 1.3% | +494.5% |
| 15 | BANK OF AMERICA CORP /DE/ | 276,317 | $10.4M | 0.0% | 1.3% | +50.5% |
| 16 | MILLENNIUM MANAGEMENT LLC | 253,677 | $9.5M | 0.0% | 1.2% | -33.4% |
| 17 | Squarepoint Ops LLC | 238,766 | $8.9M | 0.0% | 1.1% | +115.9% |
| 18 | TWO SIGMA INVESTMENTS, LP | 198,912 | $7.5M | 0.0% | 0.9% | +473.1% |
| 19 | CITADEL ADVISORS LLC | 198,712 | $7.4M | 0.0% | 0.9% | +249.9% |
| 20 | OSTERWEIS CAPITAL MANAGEMENT INCNEW | 174,600 | $6.5M | 0.3% | 0.8% | new |
| 21 | TUDOR INVESTMENT CORP ET ALNEW | 169,848 | $6.4M | 0.0% | 0.8% | new |
| 22 | LORD, ABBETT & CO. LLCNEW | 152,175 | $5,700 | 0.0% | 0.7% | new |
| 23 | Wealthspire Advisors, LLC | 141,607 | $5.3M | 0.0% | 0.7% | 0.0% |
| 24 | Russell Investments Group, Ltd. | 125,513 | $4.7M | 0.0% | 0.6% | -9.2% |
| 25 | SEI INVESTMENTS CO | 118,607 | $4.4M | 0.0% | 0.6% | -3.5% |
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.