Mayville Engineering Co.MEC
13F holders, Q2 2026 (June 30)155holders +31
52new positions
20sold out
5famous investors
$37.33avg. 13F price*
At the end of Q2 2026, 155 institutions reported holding Mayville Engineering Co. Inc. (MEC) in their 13F filings, up 31 from Q1 2026. 52 opened new positions and 20 sold out. The largest holders were Portolan Capital Management, LLC ($48.7M), FMR LLC ($48.0M) and BlackRock, Inc. ($44.3M). 5 famous investors held it, including Paul Tudor Jones (0.0% of Tudor Investment Corporation's portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Mayville Engineering Co. Inc.
- CUSIP
- 578605107
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 52 | $177.1M |
| Exits | 20 | $18.1M |
All 13F filers, Q1 2026 → Q2 2026: 9,380,510 shares bought and 3,133,409 shares sold, net +6,247,101 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 155 holders
| Portolan Capital Management, LLC | 1.82% | Add +58.2% | 1,299,256 | $48.7M |
| FMR LLC | 0.00% | Add +29943.9% | 1,280,170 | $48.0M |
| BlackRock, Inc. | 0.00% | Add +34.2% | 1,183,443 | $44.3M |
| Allspring Global Investments Holdings, LLC | 0.06% | Reduce -46.4% | 1,072,916 | $37.8M |
| Driehaus Capital Management LLC | 0.18% | New | 846,354 | $31.7M |
| Summit Partners Public Asset Management, LLC | 0.78% | New | 800,000 | $30.0M |
| Dimensional Fund Advisors LP | 0.01% | Reduce -15.5% | 782,276 | $29.3M |
| Royce & Associates LP | 0.23% | Add +0.1% | 752,083 | $28.2M |
| Vanguard Capital Management LLC | 0.00% | Add +25.0% | 743,621 | $27.9M |
| Boston Partners | 0.02% | Add +199.4% | 696,429 | $25.8M |
| Jupiter Topco LLC | 0.01% | — | 575,278 | $21.5M |
| Blair William & Co. | 0.05% | Reduce -3.3% | 546,714 | $20.5M |
| Wellington Management Group LLP | 0.00% | New | 477,583 | $17.9M |
| EVR Research LP | 8.17% | Reduce -28.7% | 441,908 | $16.6M |
| Geode Capital Management, LLC | 0.00% | Add +11.5% | 374,578 | $14.0M |
| First Eagle Investment Management, LLC | 0.02% | Reduce -8.5% | 369,575 | $13.8M |
| Jane Street Group, LLC | 0.01% | New | 356,151 | $13.3M |
| JPMorgan Chase & Co. | 0.00% | Add +6235.1% | 347,224 | $13.0M |
| Kennedy Capital Management LLC | 0.22% | Add +215.0% | 336,377 | $12.6M |
| Ophir Asset Management Pty Ltd | 1.01% | New | 326,699 | $12.2M |
| Granahan Investment Management, LLC | 0.43% | Reduce -16.4% | 324,108 | $12.1M |
| Silvercrest Asset Management Group LLC | 0.08% | Add +16.4% | 313,943 | $11.8M |
| State Street Corp. | 0.00% | Add +1.9% | 291,168 | $10.9M |
| Nuveen, LLC | 0.00% | Add +494.5% | 281,914 | $10.6M |
| Bank of America Corp. | 0.00% | Add +50.5% | 276,317 | $10.4M |
| Millennium Management | 0.01% | Reduce -33.4% | 253,677 | $9.5M |
| JB Capital Partners LP | 1.45% | No change | 250,512 | $9.4M |
| Squarepoint Ops LLC | 0.02% | Add +115.9% | 238,766 | $8.9M |
| Congruence Capital, LLC | 2.31% | Add +0.5% | 235,580 | $8.8M |
| Bridgeway Capital Management, LLC | 0.13% | Reduce -9.8% | 200,980 | $7.5M |
| Two Sigma Investments, LP | 0.01% | Add +473.1% | 198,912 | $7.5M |
| Citadel Advisors | 0.00% | Add +249.9% | 198,712 | $7.4M |
| AWM Investment Company, Inc. | 0.59% | New | 180,000 | $6.7M |
| Osterweis Capital Management Inc. | 0.36% | New | 174,600 | $6.5M |
| Tudor Investment Corporation | 0.03% | New | 169,848 | $6.4M |
| Lord, Abbett & Co. LLC | 0.02% | New | 152,175 | $5.7M |
| Wealthspire Advisors, LLC | 0.03% | No change | 141,607 | $5.3M |
| Pillsbury Lake Capital LLC | 1.41% | New | 136,746 | $5.1M |
| Informed Momentum Co LLC | 0.43% | New | 129,182 | $4.8M |
| Russell Investments Group, Ltd. | 0.00% | Reduce -9.2% | 125,513 | $4.7M |
| Sei Investments Co. | 0.00% | Reduce -3.5% | 118,607 | $4.4M |
| Empowered Funds, LLC | 0.02% | Reduce -5.5% | 116,570 | $4.4M |
| Northern Trust Corp. | 0.00% | Add +14.6% | 114,995 | $4.3M |
| BNP Paribas Financial Markets | 0.00% | Add +3919.1% | 112,455 | $4.2M |
| Needham Investment Management LLC | 0.12% | Add +450.0% | 110,000 | $4.1M |
| Hunter Associates Investment Management LLC | 0.46% | New | 107,528 | $4.0M |
| Trexquant Investment LP | 0.02% | New | 100,517 | $3.8M |
| Morgan Stanley | 0.00% | Add +320.2% | 100,159 | $3.8M |
| Vanguard Fiduciary Trust Co. | 0.00% | Add +8.4% | 98,709 | $3.7M |
| Vanguard Portfolio Management LLC | 0.00% | Add +29.5% | 98,263 | $3.7M |
| Walleye Capital LLC | 0.02% | New | 93,444 | $3.5M |
| Qube Research & Technologies Ltd | 0.00% | New | 87,129 | $3.3M |
| Susquehanna International Group, LLP | 0.00% | New | 85,462 | $3.2M |
| UBS Group AG | 0.00% | Reduce -29.1% | 82,662 | $3.1M |
| Anchor Capital Advisors LLC | 0.09% | Reduce -0.7% | 80,884 | $3.0M |
| Invesco Ltd. | 0.00% | Add +178.7% | 75,331 | $2.8M |
| Formula Growth Ltd. | 0.99% | Reduce -25.0% | 75,000 | $2.8M |
| Tocqueville Asset Management L.P. | 0.04% | No change | 71,100 | $2.7M |
| Panoramic Capital, LLC | 1.13% | Reduce -50.0% | 70,000 | $2.6M |
| XTX Topco Ltd | 0.03% | Add +58.2% | 65,604 | $2.5M |
| Polen Capital Management LLC | 0.02% | New | 61,827 | $2.3M |
| Essential Investment Partners LLC | 1.77% | Add +48.6% | 58,886 | $2.2M |
| Citigroup Inc. | 0.00% | Add +3114.4% | 52,620 | $2.0M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -19.9% | 51,990 | $1.9M |
| American Century Companies Inc. | 0.00% | Reduce -78.3% | 48,211 | $1.8M |
| Balyasny Asset Management L.P. | 0.00% | New | 47,052 | $1.8M |
| Charles Schwab Investment Management Inc. | 0.00% | Add +14.4% | 45,861 | $1.7M |
| SummerHaven Investment Management, LLC | 0.91% | No change | 45,325 | $1.7M |
| Bank of New York Mellon Corp | 0.00% | Add +15.5% | 44,873 | $1.7M |
| GatePass Capital, LLC | 0.58% | New | 40,000 | $1.5M |
| Osaic Holdings, Inc. | 0.00% | Reduce -60.0% | 39,614 | $1.5M |
| Sheets Smith Wealth Management | 0.14% | Reduce -2.8% | 37,897 | $1.4M |
| Diametric Capital, LP | 0.14% | New | 35,727 | $1.3M |
| Aquatic Capital Management LLC | 0.04% | Add +256.5% | 31,731 | $1.2M |
| Janney Montgomery Scott LLC | 0.00% | Reduce 0.0% | 31,304 | $1.2M |
| CenterBook Partners LP | 0.06% | Reduce -74.2% | 30,992 | $1.2M |
| Boothbay Fund Management, LLC | 0.02% | New | 30,584 | $1.1M |
| North Star Investment Management Corp. | 0.06% | No change | 30,000 | $1.1M |
| Kornitzer Capital Management Inc. | 0.02% | New | 29,587 | $1.1M |
| Harbor Capital Advisors, Inc. | 0.07% | Add +267.7% | 28,625 | $1.1M |
| Renaissance Technologies | 0.00% | Reduce -55.5% | 28,000 | $1.0M |
| Divisadero Street Capital Management, LP | 0.02% | New | 27,482 | $1.0M |
| Quadrature Capital Ltd | 0.01% | New | 26,477 | $992K |
| Johnson Financial Group, Inc. | 0.03% | Add +57.8% | 26,000 | $974K |
| Prelude Capital Management, LLC | 0.07% | New | 23,969 | $898K |
| LPL Financial LLC | 0.00% | Add +1.8% | 22,172 | $831K |
| O'shaughnessy Asset Management, LLC | 0.00% | Reduce -17.4% | 21,785 | $816K |
| HRT Financial LP | 0.00% | New | 21,568 | $807K |
| Wells Fargo & Company | 0.00% | Add +61.5% | 20,300 | $760K |
| Rhumbline Advisers | 0.00% | Add +9.9% | 20,001 | $749K |
| Envestnet Asset Management Inc. | 0.00% | Reduce -6.8% | 18,920 | $709K |
| AQR Capital Management | 0.00% | Reduce -10.6% | 18,224 | $683K |
| State of Wisconsin Investment Board | 0.00% | Reduce -43.7% | 18,171 | $681K |
| Wesbanco Bank Inc. | 0.02% | New | 18,000 | $674K |
| Deutsche Bank AG | 0.00% | Add +39.5% | 14,278 | $535K |
| Caption Management, LLC | 0.02% | New | 14,092 | $528K |
| Franklin Resources Inc. | 0.00% | Reduce -5.3% | 12,816 | $480K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | New | 13,946 | $470K |
| Numerai GP LLC | 0.04% | Reduce -68.8% | 12,410 | $465K |
| Creative Planning | 0.00% | New | 12,159 | $455K |
"% of holder's portfolio" is MEC's weight in each manager's 13F, not the share of Mayville Engineering Co. Inc. the manager owns.