Mayville Engineering Co.MEC
13F holders, Q3 2025 (September 30)104holders −8
12new positions
21sold out
2famous investors
$13.82avg. 13F price*
At the end of Q3 2025, 104 institutions reported holding Mayville Engineering Co. Inc. (MEC) in their 13F filings, down 8 from Q2 2025. 12 opened new positions and 21 sold out. The largest holders were Allspring Global Investments Holdings, LLC ($32.9M), BlackRock, Inc. ($12.6M) and Vanguard Group Inc. ($12.0M). 2 famous investors held it, including Jim Simons / Peter Brown (0.0% of Renaissance Technologies's portfolio) and Cliff Asness (0.0% of AQR Capital Management's portfolio).
- Company
- Mayville Engineering Co. Inc.
- CUSIP
- 578605107
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 12 | $4.4M |
| Exits | 21 | $5.3M |
All 13F filers, Q2 2025 → Q3 2025: 1,479,630 shares bought and 841,585 shares sold, net +638,045 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 104 holders
| Allspring Global Investments Holdings, LLC | 0.05% | Reduce -1.4% | 2,411,103 | $32.9M |
| BlackRock, Inc. | 0.00% | Add +0.2% | 914,839 | $12.6M |
| Vanguard Group Inc. | 0.00% | Reduce -1.2% | 871,659 | $12.0M |
| Dimensional Fund Advisors LP | 0.00% | Add +4.1% | 847,123 | $11.7M |
| Royce & Associates LP | 0.08% | Add +1.4% | 566,717 | $7.8M |
| Tocqueville Asset Management L.P. | 0.10% | Reduce -8.8% | 521,100 | $7.2M |
| 22NW, LP | 2.59% | Add +157.3% | 399,890 | $5.5M |
| Ameriprise Financial Inc. | 0.00% | Add +894.2% | 394,161 | $5.4M |
| Blair William & Co. | 0.01% | Add +1.0% | 377,210 | $5.2M |
| American Century Companies Inc. | 0.00% | Add +18.8% | 364,794 | $5.0M |
| First Eagle Investment Management, LLC | 0.01% | Add +0.1% | 354,575 | $4.9M |
| Granahan Investment Management, LLC | 0.20% | Reduce -29.9% | 349,267 | $4.8M |
| Geode Capital Management, LLC | 0.00% | Add +5.2% | 334,873 | $4.6M |
| JB Capital Partners LP | 0.76% | No change | 250,512 | $4.5M |
| State Street Corp. | 0.00% | Add +3.7% | 274,936 | $3.8M |
| Arrowstreet Capital, Limited Partnership | 0.00% | No change | 268,635 | $3.7M |
| Bridgeway Capital Management, LLC | 0.07% | Add +6.2% | 236,548 | $3.3M |
| Ancora Advisors LLC | 0.06% | Reduce -36.5% | 228,300 | $3.1M |
| Roubaix Capital, LLC | 1.36% | Add +110.3% | 212,688 | $2.9M |
| Bank of America Corp. | 0.00% | Reduce -8.2% | 208,975 | $2.9M |
| Boston Partners | 0.00% | New | 198,160 | $2.7M |
| Russell Investments Group, Ltd. | 0.00% | Reduce -11.0% | 192,394 | $2.6M |
| CenterBook Partners LP | 0.12% | Add +86.8% | 177,659 | $2.4M |
| Jacobs Levy Equity Management, Inc. | 0.01% | Add +24.9% | 170,335 | $2.3M |
| Renaissance Technologies | 0.00% | Add +7.6% | 155,000 | $2.1M |
| Osaic Holdings, Inc. | 0.00% | Reduce -7.5% | 121,786 | $1.8M |
| Empowered Funds, LLC | 0.02% | Add +12.9% | 121,880 | $1.7M |
| Globeflex Capital L P | 0.25% | No change | 116,468 | $1.6M |
| Northern Trust Corp. | 0.00% | Add +7.4% | 109,230 | $1.5M |
| UBS Group AG | 0.00% | Add +20.8% | 105,754 | $1.5M |
| Anchor Capital Advisors LLC | 0.04% | Add +2.2% | 99,775 | $1.4M |
| Wealthspire Advisors, LLC | 0.01% | No change | 95,415 | $1.3M |
| Goldman Sachs Group Inc. | 0.00% | Add +8.7% | 92,982 | $1.3M |
| Panagora Asset Management Inc. | 0.00% | Add +75.4% | 68,372 | $941K |
| AQR Capital Management | 0.00% | Add +134.7% | 59,540 | $819K |
| Sei Investments Co. | 0.00% | Add +7.4% | 55,314 | $761K |
| SummerHaven Investment Management, LLC | 0.41% | New | 51,725 | $712K |
| Nuveen, LLC | 0.00% | No change | 49,337 | $679K |
| Bank of New York Mellon Corp | 0.00% | Add +8.2% | 42,453 | $584K |
| Charles Schwab Investment Management Inc. | 0.00% | No change | 39,131 | $538K |
| Sheets Smith Wealth Management | 0.06% | Add +1.0% | 38,975 | $536K |
| Janney Montgomery Scott LLC | 0.00% | Add +0.5% | 36,665 | $505K |
| Barclays PLC | 0.00% | Reduce -9.4% | 36,677 | $505K |
| State of Wisconsin Investment Board | 0.00% | Add +47.3% | 35,797 | $493K |
| Martingale Asset Management L P | 0.01% | Reduce -18.2% | 35,610 | $490K |
| Morgan Stanley | 0.00% | Reduce -43.8% | 35,001 | $482K |
| Perritt Capital Management Inc | 0.20% | No change | 30,000 | $413K |
| O'shaughnessy Asset Management, LLC | 0.00% | Reduce -2.4% | 29,848 | $411K |
| Franklin Resources Inc. | 0.00% | Add +75.2% | 27,778 | $382K |
| Victory Capital Management Inc. | 0.00% | Add +76.1% | 26,731 | $368K |
| Invesco Ltd. | 0.00% | Reduce -11.0% | 26,191 | $360K |
| ExodusPoint Capital Management, LP | 0.01% | New | 26,039 | $358K |
| Raymond James Financial Inc. | 0.00% | Add +3.0% | 25,187 | $347K |
| Envestnet Asset Management Inc. | 0.00% | Reduce -4.1% | 24,250 | $334K |
| EntryPoint Capital, LLC | 0.13% | Add +51.4% | 24,098 | $332K |
| Avior Wealth Management, LLC | 0.01% | No change | 22,919 | $315K |
| STRS Ohio | 0.00% | Reduce -28.3% | 22,300 | $307K |
| LPL Financial LLC | 0.00% | Add +2.5% | 21,377 | $294K |
| Gradient Investments LLC | 0.00% | Reduce -2.2% | 21,099 | $290K |
| Rhumbline Advisers | 0.00% | Add +0.4% | 20,053 | $276K |
| Prudential Financial Inc. | 0.00% | New | 19,025 | $262K |
| Jane Street Group, LLC | 0.00% | New | 18,730 | $258K |
| Wells Fargo & Company | 0.00% | Add +17.4% | 16,723 | $230K |
| Public Employees Retirement System of Ohio | 0.00% | Add +54.0% | 16,689 | $230K |
| Sterling Capital Management LLC | 0.00% | Add +3.5% | 16,371 | $225K |
| Alliancebernstein L.P. | 0.00% | No change | 13,190 | $181K |
| Wealth Enhancement Advisory Services, LLC | 0.00% | Add +2.7% | 12,992 | $170K |
| State of Wyoming | 0.02% | Reduce -3.4% | 12,315 | $169K |
| Royal Bank of Canada | 0.00% | Reduce -72.1% | 8,605 | $118K |
| AlphaQuest LLC | 0.01% | Add +26.2% | 8,342 | $115K |
| MetLife Investment Management, LLC | 0.00% | No change | 7,958 | $110K |
| Harbour Investments, Inc. | 0.00% | No change | 7,700 | $106K |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.00% | Reduce -14.4% | 6,668 | $92K |
| JPMorgan Chase & Co. | 0.00% | Reduce -18.2% | 6,489 | $89K |
| New York State Common Retirement Fund | 0.00% | No change | 5,395 | $74K |
| Police & Firemen's Retirement System of New Jersey | 0.00% | Add +81.9% | 4,651 | $64K |
| FMR LLC | 0.00% | Add +3.9% | 3,267 | $45K |
| BNP Paribas Financial Markets | 0.00% | Add +109.0% | 2,751 | $38K |
| Arax Advisory Partners | 0.00% | New | 1,616 | $22K |
| Tower Research Capital LLC (TRC) | 0.00% | Reduce -20.4% | 1,525 | $21K |
| Ameritas Investment Partners, Inc. | 0.00% | No change | 1,454 | $20K |
| Jones Financial Companies LLLP | 0.00% | Add +19.3% | 1,329 | $18K |
| New York State Teachers Retirement System | 0.00% | Add +10.8% | 1,287 | $18K |
| Legal & General Group Plc | 0.00% | No change | 1,260 | $17K |
| Citigroup Inc. | 0.00% | Reduce -78.7% | 1,224 | $17K |
| Avion Wealth | 0.00% | No change | 1,000 | $13K |
| Cwm, LLC | 0.00% | Reduce -21.1% | 936 | $13K |
| California State Teachers Retirement System | 0.00% | Add +0.1% | 923 | $13K |
| Clearstead Advisors, LLC | 0.00% | New | 710 | $10K |
| Comerica Bank | 0.00% | Reduce -22.4% | 398 | $5K |
| Amalgamated Bank | 0.00% | No change | 372 | $5K |
| Rockefeller Capital Management L.P. | 0.00% | New | 276 | $4K |
| Optiver Holding B.V. | 0.00% | New | 236 | $3K |
| Advisory Services Network, LLC | 0.00% | New | 210 | $3K |
| GAMMA Investing LLC | 0.00% | Reduce -12.1% | 80 | $1K |
| CIBC Private Wealth Group LLC | 0.00% | New | 80 | $1K |
| EverSource Wealth Advisors, LLC | 0.00% | Reduce -42.6% | 66 | $908 |
| Nisa Investment Advisors, LLC | 0.00% | Reduce -22.4% | 59 | $812 |
| Allworth Financial LP | 0.00% | Reduce -1.7% | 58 | $799 |
| Parkside Financial Bank & Trust | 0.00% | No change | 35 | $482 |
"% of holder's portfolio" is MEC's weight in each manager's 13F, not the share of Mayville Engineering Co. Inc. the manager owns.