MAYVILLE ENGR CO INC (MEC)
Institutional ownership reported to the SEC as of Q2 2026, across 29 quarters.
149
Reporting holders
$804.9M
Reported value
81.8%
Of shares outstanding
3.3%
Held as options
+28
Holder change
Institutions report 20,847,923 shares against 25,500,331 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| Portolan Capital Management, LLC | $48.7M | 1,299,256 | 1.82% | 3q | +58.2%+$17.9M |
| FMR LLC | $48.0M | 1,280,170 | 0.00% | 18q | +29943.9%+$47.8M |
| BlackRock, Inc. | $44.3M | 1,183,443 | 0.00% | 8q | +34.2%+$11.3M |
| Allspring Global Investments Holdings, LLC | $37.8M | 1,072,916 | 0.06% | 19q | -46.4%-$32.7M |
| Driehaus Capital Management LLC | $31.7M | 846,354 | 0.18% | new | NEW |
| SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC | $30.0M | 800,000 | 0.53% | new | NEW |
| DIMENSIONAL FUND ADVISORS LP | $29.3M | 782,276 | 0.01% | 22q | -15.5%-$5.4M |
| ROYCE & ASSOCIATES LP | $28.2M | 752,083 | 0.23% | 15q | HELD |
| VANGUARD CAPITAL MANAGEMENT LLC | $27.9M | 743,621 | 0.00% | 2q | +25.0%+$5.6M |
| Boston Partners | $25.8M | 696,429 | 0.02% | 4q | +199.4%+$17.2M |
| Jupiter Topco LLC | $21.5M | 575,278 | 0.01% | new | FIRST |
| BLAIR WILLIAM & CO/IL | $20.5M | 546,714 | 0.05% | 14q | -3.3%-$696.2K |
| WELLINGTON MANAGEMENT GROUP LLP | $17.9M | 477,583 | 0.00% | new | NEW |
| EVR Research LP | $16.6M | 441,908 | 8.17% | 3q | -28.7%-$6.7M |
| JANE STREET GROUP, LLC | $15.1M | 356,151 | 0.00% | new | NEW |
| GEODE CAPITAL MANAGEMENT, LLC | $14.0M | 374,578 | 0.00% | 29q | +11.5%+$1.5M |
| First Eagle Investment Management, LLC | $13.8M | 369,575 | 0.02% | 10q | -8.5%-$1.3M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $13.5M | 85,462 | 0.00% | new | NEW |
| JPMORGAN CHASE & CO | $13.0M | 347,224 | 0.00% | 15q | +6235.0%+$12.8M |
| KENNEDY CAPITAL MANAGEMENT LLC | $12.6M | 336,377 | 0.22% | 3q | +215.0%+$8.6M |
| Ophir Asset Management Pty Ltd | $12.2M | 326,699 | 1.01% | new | NEW |
| Granahan Investment Management, LLC | $12.1M | 324,108 | 0.43% | 12q | -16.4%-$2.4M |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | $11.8M | 313,943 | 0.08% | 3q | +16.4%+$1.7M |
| STATE STREET CORP | $10.9M | 291,168 | 0.00% | 29q | +1.9%+$199.2K |
| Nuveen, LLC | $10.6M | 281,914 | 0.00% | 6q | +494.5%+$8.8M |
| BANK OF AMERICA CORP /DE/ | $10.4M | 276,317 | 0.00% | 29q | +50.5%+$3.5M |
| CITADEL ADVISORS LLC | $10.0M | 198,712 | 0.00% | 3q | +249.9%+$7.1M |
| MILLENNIUM MANAGEMENT LLC | $9.5M | 253,677 | 0.00% | 3q | -33.4%-$4.8M |
| JB CAPITAL PARTNERS LP | $9.4M | 250,512 | 1.45% | 12q | HELD |
| Squarepoint Ops LLC | $8.9M | 238,766 | 0.01% | 2q | +115.9%+$4.8M |
| CONGRUENCE CAPITAL, LLC | $8.8M | 235,580 | 2.31% | 3q | HELD |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | $7.5M | 200,980 | 0.13% | 25q | -9.8%-$813.7K |
| TWO SIGMA INVESTMENTS, LP | $7.5M | 198,912 | 0.01% | 2q | +473.1%+$6.2M |
| AWM Investment Company, Inc. | $6.7M | 180,000 | 0.59% | new | NEW |
| OSTERWEIS CAPITAL MANAGEMENT INC | $6.5M | 174,600 | 0.31% | new | NEW |
| TUDOR INVESTMENT CORP ET AL | $6.4M | 169,848 | 0.01% | new | NEW |
| PEAK6 LLC | $5.6M | options only | 0.01% | new | OPTIONS |
| Wealthspire Advisors, LLC | $5.3M | 141,607 | 0.03% | 19q | HELD |
| Pillsbury Lake Capital LLC | $5.1M | 136,746 | 1.40% | new | NEW |
| Informed Momentum Co LLC | $4.8M | 129,182 | 0.43% | new | NEW |
| Russell Investments Group, Ltd. | $4.7M | 125,513 | 0.00% | 25q | -9.2%-$475.8K |
| SEI INVESTMENTS CO | $4.4M | 118,607 | 0.00% | 14q | -3.5%-$160.0K |
| Empowered Funds, LLC | $4.4M | 116,570 | 0.02% | 2q | -5.5%-$251.8K |
| NORTHERN TRUST CORP | $4.3M | 114,995 | 0.00% | 29q | +14.6%+$547.3K |
| Caption Management, LLC | $4.3M | 14,092 | 0.02% | new | NEW |
| BNP PARIBAS FINANCIAL MARKETS | $4.2M | 112,455 | 0.00% | 13q | +3919.1%+$4.1M |
| NEEDHAM INVESTMENT MANAGEMENT LLC | $4.1M | 110,000 | 0.12% | 2q | +450.0%+$3.4M |
| Trexquant Investment LP | $3.8M | 100,517 | 0.02% | new | NEW |
| MORGAN STANLEY | $3.8M | 100,159 | 0.00% | 29q | +320.2%+$2.9M |
| VANGUARD FIDUCIARY TRUST CO | $3.7M | 98,709 | 0.00% | 2q | +8.4%+$287.1K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $3.7M | 98,263 | 0.00% | 2q | +29.5%+$837.6K |
| Walleye Capital LLC | $3.5M | 93,444 | 0.01% | new | NEW |
| Qube Research & Technologies Ltd | $3.3M | 87,129 | 0.00% | new | NEW |
| UBS Group AG | $3.1M | 82,662 | 0.00% | 29q | -29.1%-$1.3M |
| ANCHOR CAPITAL ADVISORS LLC | $3.0M | 80,884 | 0.09% | 13q | -0.7%-$20.9K |
| Invesco Ltd. | $2.8M | 75,331 | 0.00% | 18q | +178.7%+$1.8M |
| FORMULA GROWTH LTD | $2.8M | 75,000 | 0.99% | 3q | -25.0%-$936.5K |
| TOCQUEVILLE ASSET MANAGEMENT L.P. | $2.7M | 71,100 | 0.04% | 27q | HELD |
| Panoramic Capital, LLC | $2.6M | 70,000 | 1.13% | 2q | -50.0%-$2.6M |
| XTX Topco Ltd | $2.5M | 65,604 | 0.03% | 3q | +58.2%+$903.8K |
| POLEN CAPITAL MANAGEMENT LLC | $2.3M | 61,827 | 0.02% | new | NEW |
| Essential Investment Partners LLC | $2.2M | 58,886 | 1.77% | 3q | +48.6%+$721.0K |
| CITIGROUP INC | $2.0M | 52,620 | 0.00% | 15q | +3114.4%+$1.9M |
| GOLDMAN SACHS GROUP INC | $1.9M | 51,990 | 0.00% | 9q | -19.9%-$483.9K |
| AMERICAN CENTURY COMPANIES INC | $1.8M | 48,211 | 0.00% | 15q | -78.3%-$6.5M |
| Balyasny Asset Management L.P. | $1.8M | 47,052 | 0.00% | new | NEW |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $1.7M | 45,861 | 0.00% | 13q | +14.4%+$215.9K |
| Sixth Street Partners Management Company, L.P. | $1.7M | 45,861 | 0.00% | new | NEW |
| SummerHaven Investment Management, LLC | $1.7M | 45,325 | 0.91% | 4q | HELD |
| Bank of New York Mellon Corp | $1.7M | 44,873 | 0.00% | 13q | +15.5%+$225.6K |
| GatePass Capital, LLC | $1.5M | 40,000 | 0.57% | new | NEW |
| OSAIC HOLDINGS, INC. | $1.5M | 39,614 | 0.00% | 26q | -60.0%-$2.2M |
| SHEETS SMITH WEALTH MANAGEMENT | $1.4M | 37,897 | 0.14% | 18q | -2.8%-$40.4K |
| Diametric Capital, LP | $1.3M | 35,727 | 0.14% | new | NEW |
| Aquatic Capital Management LLC | $1.2M | 31,731 | 0.04% | 3q | +256.5%+$855.2K |
| CenterBook Partners LP | $1.2M | 30,992 | 0.06% | 6q | -74.2%-$3.3M |
| BOOTHBAY FUND MANAGEMENT, LLC | $1.1M | 30,584 | 0.02% | new | NEW |
| North Star Investment Management Corp. | $1.1M | 30,000 | 0.06% | 2q | HELD |
| J. Goldman & Co LP | $1.1M | options only | 0.03% | new | OPTIONS |
| KORNITZER CAPITAL MANAGEMENT INC /KS | $1.1M | 29,587 | 0.02% | new | NEW |
| RENAISSANCE TECHNOLOGIES LLC | $1.0M | 28,000 | 0.00% | 9q | -55.5%-$1.3M |
| Divisadero Street Capital Management, LP | $1.0M | 27,482 | 0.02% | new | NEW |
| Quadrature Capital Ltd | $991.8K | 26,477 | 0.01% | new | NEW |
| Johnson Financial Group, Inc. | $974.0K | 26,000 | 0.03% | 3q | +57.8%+$356.8K |
| PRELUDE CAPITAL MANAGEMENT, LLC | $897.9K | 23,969 | 0.07% | new | NEW |
| LPL Financial LLC | $830.6K | 22,172 | 0.00% | 29q | +1.8%+$15.0K |
| O'SHAUGHNESSY ASSET MANAGEMENT, LLC | $816.1K | 21,785 | 0.00% | 14q | -17.4%-$171.8K |
| IMC-Chicago, LLC | $775.4K | options only | 0.00% | new | OPTIONS |
| WELLS FARGO & COMPANY/MN | $760.4K | 20,300 | 0.00% | 29q | -19.2%-$181.2K |
| RHUMBLINE ADVISERS | $749.2K | 20,001 | 0.00% | 13q | +9.9%+$67.5K |
| GROUP ONE TRADING LLC | $749.2K | options only | 0.00% | new | OPTIONS |
| ENVESTNET ASSET MANAGEMENT INC | $708.7K | 18,920 | 0.00% | 12q | -6.8%-$51.7K |
| AQR CAPITAL MANAGEMENT LLC | $682.7K | 18,224 | 0.00% | 8q | -10.6%-$80.9K |
| STATE OF WISCONSIN INVESTMENT BOARD | $680.7K | 18,171 | 0.00% | 7q | -43.7%-$527.8K |
| WESBANCO BANK INC | $674.3K | 18,000 | 0.02% | new | NEW |
| DEUTSCHE BANK AG\ | $534.9K | 14,278 | 0.00% | 3q | +39.5%+$151.4K |
| FRANKLIN RESOURCES INC | $480.1K | 12,816 | 0.00% | 8q | -5.3%-$26.7K |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | $470.3K | 13,946 | 0.00% | new | NEW |
| Numerai GP LLC | $464.9K | 12,410 | 0.04% | 2q | -68.8%-$1.0M |
| Creative Planning | $455.5K | 12,159 | 0.00% | new | NEW |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-06 | 13G | FMR LLCwith 1 co-filers | 5.0% |
| 2026-07-08 | 13G/A | Allspring Global Investments Holdings, LLC | 4.2% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 149 | $804.9M | 20,847,923 | 52 | 40 | 38 | 3.3% |
| Q1 2026 | 121 | $264.2M | 14,721,479 | 19 | 38 | 36 | 0.0% |
| Q4 2025 | 117 | $260.2M | 13,830,232 | 25 | 33 | 39 | 0.3% |
| Q3 2025 | 100 | $183.1M | 13,246,463 | 12 | 39 | 27 | 0.0% |
| Q2 2025 | 106 | $201.6M | 12,586,220 | 14 | 41 | 29 | 0.0% |
| Q1 2025 | 107 | $166.3M | 12,306,464 | 13 | 30 | 37 | 0.1% |
| Q4 2024 | 104 | $192.6M | 12,259,848 | 13 | 43 | 23 | 0.2% |
| Q3 2024 | 107 | $243.4M | 11,547,067 | 30 | 43 | 21 | 0.1% |
| Q2 2024 | 91 | $178.6M | 10,663,505 | 19 | 35 | 19 | 0.5% |
| Q1 2024 | 76 | $138.6M | 9,610,986 | 4 | 21 | 24 | 0.7% |
| Q4 2023 | 77 | $134.8M | 9,257,459 | 6 | 28 | 21 | 1.0% |
| Q3 2023 | 78 | $97.0M | 8,793,878 | 10 | 26 | 18 | 0.6% |
| Q2 2023 | 78 | $106.8M | 8,511,500 | 24 | 27 | 19 | 0.7% |
| Q1 2023 | 68 | $112.7M | 7,523,907 | 13 | 28 | 18 | 0.4% |
| Q4 2022 | 57 | $81.6M | 6,458,660 | 18 | 12 | 15 | 0.0% |
| Q3 2022 | 57 | $41.3M | 6,343,054 | 7 | 17 | 13 | 0.0% |
| Q2 2022 | 60 | $55.6M | 7,178,375 | 13 | 19 | 14 | 0.0% |
| Q1 2022 | 64 | $70.0M | 7,472,601 | 10 | 19 | 21 | 0.0% |
| Q4 2021 | 67 | $108.7M | 7,288,632 | 6 | 19 | 25 | 0.0% |
| Q3 2021 | 77 | $141.2M | 7,501,066 | 24 | 21 | 19 | 0.0% |
| Q2 2021 | 58 | $164.5M | 8,181,875 | 7 | 30 | 17 | 0.0% |
| Q1 2021 | 59 | $106.9M | 7,432,446 | 10 | 22 | 16 | 0.0% |
| Q4 2020 | 53 | $96.2M | 7,179,815 | 7 | 20 | 15 | 0.0% |
| Q3 2020 | 49 | $62.2M | 6,765,636 | 6 | 16 | 15 | 0.0% |
| Q2 2020 | 52 | $49.7M | 6,289,360 | 8 | 20 | 12 | 0.0% |
| Q1 2020 | 50 | $35.0M | 5,708,087 | 9 | 14 | 20 | 0.0% |
| Q4 2019 | 49 | $58.0M | 6,178,748 | 8 | 24 | 11 | 0.0% |
| Q3 2019 | 50 | $77.3M | 5,862,954 | 9 | 18 | 14 | 0.0% |
| Q2 2019 | 53 | $80.4M | 5,826,054 | 53 | 0 | 0 | 0.0% |