Who Owns MAYVILLE ENGR CO INC (MEC)? -- Institutional Holders (2026-06-30)
175 institutions reported holding $819.0M of MAYVILLE ENGR CO INC (MEC) in SEC 13F filings for 2026-06-30. Largest institutional holders: Portolan Capital Management, LLC ($48.7M), FMR LLC ($48.0M), BlackRock, Inc. ($44.3M), Allspring Global Investments Holdings, LLC ($37.8M), VANGUARD GROUP INC ($35.5M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|
| 1 | Portolan Capital Management, LLC | $48.7M | 1.3M | Added |
| 2 | FMR LLC | $48.0M | 1.3M | Added |
| 3 | BlackRock, Inc. | $44.3M | 1.2M | Added |
| 4 | Allspring Global Investments Holdings, LLC | $37.8M | 1.1M | Trimmed |
| 5 | VANGUARD GROUP INC | $35.5M | 948,711 | Added |
| 6 | Driehaus Capital Management LLC | $31.7M | 846,354 | New |
| 7 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | $30.0M | 800,000 | New |
| 8 | DIMENSIONAL FUND ADVISORS LP | $29.3M | 782,276 | Trimmed |
| 9 | ROYCE & ASSOCIATES LP | $28.2M | 752,083 | Added |
| 10 | Boston Partners | $25.8M | 696,429 | Added |
| 11 | Jupiter Topco LLC | $21.5M | 575,278 | New |
| 12 | BLAIR WILLIAM & CO/IL | $20.5M | 546,714 | Trimmed |
| 13 | WELLINGTON MANAGEMENT GROUP LLP | $17.9M | 477,583 | New |
| 14 | EVR Research LP | $16.6M | 441,908 | Trimmed |
| 15 | JANE STREET GROUP, LLC | $15.1M | 403,351 | New |
| 16 | GEODE CAPITAL MANAGEMENT, LLC | $14.0M | 374,578 | Added |
| 17 | First Eagle Investment Management, LLC | $13.8M | 369,575 | Trimmed |
| 18 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $13.5M | 361,462 | New |
| 19 | JPMORGAN CHASE & CO | $13.0M | 347,224 | Added |
| 20 | KENNEDY CAPITAL MANAGEMENT LLC | $12.6M | 336,377 | Added |
| 21 | Ophir Asset Management Pty Ltd | $12.2M | 326,699 | New |
| 22 | Granahan Investment Management, LLC | $12.1M | 324,108 | Trimmed |
| 23 | SILVERCREST ASSET MANAGEMENT GROUP LLC | $11.8M | 313,943 | Added |
| 24 | STATE STREET CORP | $10.9M | 291,168 | Added |
| 25 | Nuveen, LLC | $10.6M | 281,914 | Added |
Source: SEC Form 13F filings · as of 2026-06-30