Mayville Engineering Co.MEC
13F holders, Q4 2025 (December 31)123holders +19
27new positions
11sold out
5famous investors
$18.75avg. 13F price*
At the end of Q4 2025, 123 institutions reported holding Mayville Engineering Co. Inc. (MEC) in their 13F filings, up 19 from Q3 2025. 27 opened new positions and 11 sold out. The largest holders were Allspring Global Investments Holdings, LLC ($38.9M), Dimensional Fund Advisors LP ($16.4M) and BlackRock, Inc. ($16.2M). 5 famous investors held it, including Israel Englander (0.0% of Millennium Management's portfolio), Jim Simons / Peter Brown (0.0% of Renaissance Technologies'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 Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 27 | $35.6M |
| Exits | 11 | $5.2M |
All 13F filers, Q3 2025 → Q4 2025: 2,590,752 shares bought and 2,229,876 shares sold, net +360,876 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 123 holders
| Allspring Global Investments Holdings, LLC | 0.06% | Reduce -14.9% | 2,052,613 | $38.9M |
| Dimensional Fund Advisors LP | 0.00% | Add +3.5% | 877,175 | $16.4M |
| BlackRock, Inc. | 0.00% | Reduce -5.4% | 865,619 | $16.2M |
| Vanguard Group Inc. | 0.00% | Reduce -28.0% | 627,655 | $11.7M |
| Royce & Associates LP | 0.12% | Add +10.2% | 624,307 | $11.7M |
| EVR Research LP | 6.11% | New | 605,000 | $11.3M |
| Blair William & Co. | 0.03% | Add +54.8% | 583,759 | $10.9M |
| Portolan Capital Management, LLC | 0.51% | New | 512,762 | $9.6M |
| 22NW, LP | 3.26% | Add +3.6% | 414,280 | $7.8M |
| First Eagle Investment Management, LLC | 0.01% | Add +1.0% | 358,075 | $6.7M |
| Ameriprise Financial Inc. | 0.00% | Reduce -11.0% | 350,844 | $6.6M |
| Geode Capital Management, LLC | 0.00% | Reduce -1.8% | 328,921 | $6.2M |
| Arrowstreet Capital, Limited Partnership | 0.00% | Add +7.4% | 288,450 | $5.4M |
| State Street Corp. | 0.00% | Add +3.7% | 285,000 | $5.3M |
| American Century Companies Inc. | 0.00% | Reduce -23.0% | 280,840 | $5.3M |
| Granahan Investment Management, LLC | 0.21% | Reduce -23.3% | 267,762 | $5.0M |
| CenterBook Partners LP | 0.23% | Add +44.0% | 255,791 | $4.8M |
| JB Capital Partners LP | 0.81% | No change | 250,512 | $4.7M |
| Bridgeway Capital Management, LLC | 0.09% | Reduce -4.1% | 226,926 | $4.2M |
| Boston Partners | 0.00% | Add +12.4% | 222,730 | $4.2M |
| Bank of America Corp. | 0.00% | Add +4.7% | 218,888 | $4.1M |
| Congruence Capital, LLC | 1.43% | — | 208,102 | $3.9M |
| Russell Investments Group, Ltd. | 0.00% | Reduce -1.3% | 189,981 | $3.6M |
| Silvercrest Asset Management Group LLC | 0.02% | New | 179,941 | $3.4M |
| Millennium Management | 0.00% | New | 153,200 | $2.9M |
| UBS Group AG | 0.00% | Add +38.6% | 146,552 | $2.7M |
| Roubaix Capital, LLC | 1.17% | Reduce -31.2% | 146,297 | $2.7M |
| Ancora Advisors LLC | 0.05% | Reduce -44.8% | 126,030 | $2.4M |
| Osaic Holdings, Inc. | 0.00% | Reduce -1.4% | 120,078 | $2.2M |
| Anchor Capital Advisors LLC | 0.06% | Add +8.6% | 108,318 | $2.0M |
| Kennedy Capital Management LLC | 0.04% | New | 104,345 | $2.0M |
| Citadel Advisors | 0.00% | New | 103,463 | $1.9M |
| Wealthspire Advisors, LLC | 0.01% | No change | 95,415 | $1.8M |
| Northern Trust Corp. | 0.00% | Reduce -13.6% | 94,368 | $1.8M |
| Goldman Sachs Group Inc. | 0.00% | Reduce -3.5% | 89,747 | $1.7M |
| Nuveen, LLC | 0.00% | Add +77.5% | 87,587 | $1.6M |
| Sei Investments Co. | 0.00% | Add +51.1% | 83,569 | $1.6M |
| Morgan Stanley | 0.00% | Add +135.4% | 82,390 | $1.5M |
| Renaissance Technologies | 0.00% | Reduce -54.1% | 71,200 | $1.3M |
| Tocqueville Asset Management L.P. | 0.02% | Reduce -86.4% | 71,100 | $1.3M |
| Panagora Asset Management Inc. | 0.00% | Reduce -20.1% | 54,594 | $1.0M |
| Jane Street Group, LLC | 0.00% | Add +183.4% | 53,074 | $994K |
| SummerHaven Investment Management, LLC | 0.55% | No change | 51,725 | $968K |
| Charles Schwab Investment Management Inc. | 0.00% | Add +11.1% | 43,455 | $813K |
| Bank of New York Mellon Corp | 0.00% | Reduce -0.4% | 42,289 | $792K |
| State of Wisconsin Investment Board | 0.00% | Add +13.7% | 40,697 | $762K |
| Formula Growth Ltd. | 0.29% | New | 40,000 | $749K |
| Sheets Smith Wealth Management | 0.08% | No change | 38,975 | $730K |
| Raymond James Financial Inc. | 0.00% | Add +53.5% | 38,672 | $724K |
| Barclays PLC | 0.00% | Add +0.9% | 37,025 | $693K |
| Essential Investment Partners LLC | 0.60% | — | 34,269 | $642K |
| Janney Montgomery Scott LLC | 0.00% | Reduce -6.9% | 34,150 | $639K |
| AQR Capital Management | 0.00% | Reduce -46.4% | 31,908 | $597K |
| Jacobs Levy Equity Management, Inc. | 0.00% | Reduce -81.3% | 31,868 | $597K |
| Perritt Capital Management Inc | 0.94% | No change | 30,000 | $562K |
| Rothschild Wealth LLC | 0.05% | New | 30,000 | $562K |
| Journey Strategic Wealth LLC | 0.01% | New | 29,185 | $546K |
| Invesco Ltd. | 0.00% | Add +6.4% | 27,870 | $522K |
| O'shaughnessy Asset Management, LLC | 0.00% | Reduce -9.1% | 27,144 | $508K |
| Envestnet Asset Management Inc. | 0.00% | Reduce -3.7% | 23,358 | $437K |
| Wells Fargo & Company | 0.00% | Add +34.5% | 22,491 | $421K |
| LPL Financial LLC | 0.00% | Add +1.9% | 21,788 | $408K |
| XTX Topco Ltd | 0.01% | New | 21,334 | $399K |
| Gradient Investments LLC | 0.01% | Reduce -0.9% | 20,904 | $391K |
| D. E. Shaw & Co. | 0.00% | New | 19,416 | $363K |
| Rhumbline Advisers | 0.00% | Reduce -10.1% | 18,032 | $338K |
| Johnson Financial Group, Inc. | 0.01% | New | 16,475 | $308K |
| Sterling Capital Management LLC | 0.00% | Reduce -1.2% | 16,171 | $303K |
| SummitTX Capital, L.P. | 0.01% | New | 15,118 | $283K |
| Avior Wealth Management, LLC | 0.01% | Reduce -34.9% | 14,919 | $279K |
| Worth Venture Partners, LLC | 1.86% | New | 13,735 | $257K |
| Franklin Resources Inc. | 0.00% | Reduce -51.5% | 13,458 | $252K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | Add +6.2% | 13,792 | $245K |
| HRT Financial LP | 0.00% | New | 12,933 | $242K |
| Alliancebernstein L.P. | 0.00% | Reduce -2.9% | 12,810 | $240K |
| Boothbay Fund Management, LLC | 0.01% | New | 12,160 | $228K |
| ExodusPoint Capital Management, LP | 0.00% | Reduce -56.5% | 11,316 | $212K |
| AlphaQuest LLC | 0.01% | Add +31.3% | 10,954 | $205K |
| Deutsche Bank AG | 0.00% | New | 8,249 | $154K |
| MetLife Investment Management, LLC | 0.00% | No change | 7,958 | $149K |
| Quantbot Technologies LP | 0.00% | New | 7,827 | $147K |
| Harbour Investments, Inc. | 0.00% | No change | 7,700 | $144K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Reduce -8.4% | 6,105 | $114K |
| Picton Mahoney Asset Management | 0.00% | New | 5,800 | $109K |
| JPMorgan Chase & Co. | 0.00% | Reduce -14.4% | 5,553 | $104K |
| New York State Common Retirement Fund | 0.00% | No change | 5,395 | $101K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | No change | 4,651 | $87K |
| Aquatic Capital Management LLC | 0.00% | New | 4,383 | $82K |
| State of Alaska, Department of Revenue | 0.00% | New | 3,903 | $73K |
| Royal Bank of Canada | 0.00% | Reduce -56.0% | 3,784 | $70K |
| FMR LLC | 0.00% | Add +1.9% | 3,329 | $62K |
| BNP Paribas Financial Markets | 0.00% | Add +7.4% | 2,955 | $55K |
| Jones Financial Companies LLLP | 0.00% | Add +120.4% | 2,929 | $55K |
| Public Employees Retirement System of Ohio | 0.00% | Reduce -86.9% | 2,189 | $41K |
| Clearstead Advisors, LLC | 0.00% | Add +194.9% | 2,094 | $39K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 1,454 | $27K |
| Citigroup Inc. | 0.00% | Add +13.6% | 1,391 | $26K |
| Legal & General Group Plc | 0.00% | No change | 1,260 | $24K |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -28.5% | 1,090 | $20K |
| Avion Wealth | 0.00% | No change | 1,000 | $18K |
"% of holder's portfolio" is MEC's weight in each manager's 13F, not the share of Mayville Engineering Co. Inc. the manager owns.