Mayville Engineering Company, Inc. (MEC) — Institutional Holders, Q2 2026
155 institutional investment managers reported a MEC position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $790.3M. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.
MEC in Q2 2026: what funds did
Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.
Biggest buyers
- FMRNew · +1,280,170 sh+$48.0M
- DRIEHAUS CAPITAL MANAGEMENTNew · +846,354 sh+$31.7M
- SUMMIT PARTNERS PUBLIC ASSET MANAGEMENTNew · +800,000 sh+$30.0M
- Portolan Capital ManagementAdded · +478,120 sh+$17.9M
- WELLINGTON MANAGEMENT GROUP LLPNew · +477,583 sh+$17.9M
Biggest sellers
- Allspring Global InvestmentsTrimmed · -927,434 sh-$34.7M
- AMERIPRISE FINANCIALSold out · -351,790 sh-$13.2M
- Roubaix CapitalSold out · -210,657 sh-$7.9M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIPSold out · -185,261 sh-$6.9M
- EVR ResearchTrimmed · -178,092 sh-$6.7M
MEC 13F holders ranked 1–100 of 155
| # | Institution | Shares | Value | % of portfolio | QoQShares vs Q1 2026 |
|---|---|---|---|---|---|
| 1 | Portolan Capital Management#1 · 1,299,256 sh | 1,299,256 | $48.7M | 1.82% | +58.2% |
| 2 | FMR#2 · 1,280,170 sh | 1,280,170 | $48.0M | <0.01% | New |
| 3 | BlackRock#3 · 1,183,443 sh | 1,183,443 | $44.3M | <0.01% | +34.2% |
| 4 | Allspring Global Investments#4 · 1,072,916 sh | 1,072,916 | $37.8M | 0.06% | -46.4% |
| 5 | DRIEHAUS CAPITAL MANAGEMENT#5 · 846,354 sh | 846,354 | $31.7M | 0.18% | New |
| 6 | SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT#6 · 800,000 sh | 800,000 | $30.0M | 0.53% | New |
| 7 | DIMENSIONAL FUND ADVISORS#7 · 782,276 sh | 782,276 | $29.3M | <0.01% | -15.5% |
| 8 | ROYCE & ASSOCIATES#8 · 752,083 sh | 752,083 | $28.2M | 0.23% | +0.1% |
| 9 | VANGUARD CAPITAL MANAGEMENT#9 · 743,621 sh | 743,621 | $27.9M | <0.01% | +25.0% |
| 10 | Boston Partners#10 · 696,429 sh | 696,429 | $25.8M | 0.02% | +199.4% |
| 11 | Jupiter Topco#11 · 575,278 sh | 575,278 | $21.5M | <0.01% | — |
| 12 | BLAIR WILLIAM#12 · 546,714 sh | 546,714 | $20.5M | 0.05% | -3.3% |
| 13 | WELLINGTON MANAGEMENT GROUP LLP#13 · 477,583 sh | 477,583 | $17.9M | <0.01% | New |
| 14 | EVR Research#14 · 441,908 sh | 441,908 | $16.6M | 8.17% | -28.7% |
| 15 | GEODE CAPITAL MANAGEMENT#15 · 374,578 sh | 374,578 | $14.0M | <0.01% | +11.5% |
| 16 | First Eagle Investment Management#16 · 369,575 sh | 369,575 | $13.8M | 0.02% | -8.5% |
| 17 | JANE STREET GROUP#17 · 356,151 sh | 356,151 | $13.3M | <0.01% | New |
| 18 | JPMORGAN CHASE#18 · 347,224 sh | 347,224 | $13.0M | <0.01% | +6235.0% |
| 19 | KENNEDY CAPITAL MANAGEMENT#19 · 336,377 sh | 336,377 | $12.6M | 0.22% | +215.0% |
| 20 | Ophir Asset Management Pty Ltd#20 · 326,699 sh | 326,699 | $12.2M | 1.01% | New |
| 21 | Granahan Investment Management#21 · 324,108 sh | 324,108 | $12.1M | 0.43% | -16.4% |
| 22 | SILVERCREST ASSET MANAGEMENT GROUP#22 · 313,943 sh | 313,943 | $11.8M | 0.08% | +16.4% |
| 23 | STATE STREET#23 · 291,168 sh | 291,168 | $10.9M | <0.01% | +1.9% |
| 24 | Nuveen#24 · 281,914 sh | 281,914 | $10.6M | <0.01% | +494.5% |
| 25 | BANK OF AMERICA#25 · 276,317 sh | 276,317 | $10.4M | <0.01% | +50.5% |
| 26 | MILLENNIUM MANAGEMENT#26 · 253,677 sh | 253,677 | $9.5M | <0.01% | -33.4% |
| 27 | JB CAPITAL PARTNERS#27 · 250,512 sh | 250,512 | $9.4M | 1.45% | 0.0% |
| 28 | Squarepoint Ops#28 · 238,766 sh | 238,766 | $8.9M | <0.01% | +115.9% |
| 29 | Congruence Capital#29 · 235,580 sh | 235,580 | $8.8M | 2.31% | +0.5% |
| 30 | BRIDGEWAY CAPITAL MANAGEMENT#30 · 200,980 sh | 200,980 | $7.5M | 0.13% | -9.8% |
| 31 | TWO SIGMA INVESTMENTS#31 · 198,912 sh | 198,912 | $7.5M | <0.01% | +473.1% |
| 32 | CITADEL ADVISORS#32 · 198,712 sh | 198,712 | $7.4M | <0.01% | +249.9% |
| 33 | AWM Investment Company#33 · 180,000 sh | 180,000 | $6.7M | 0.59% | New |
| 34 | OSTERWEIS CAPITAL MANAGEMENT#34 · 174,600 sh | 174,600 | $6.5M | 0.31% | New |
| 35 | TUDOR INVESTMENT ET AL#35 · 169,848 sh | 169,848 | $6.4M | <0.01% | New |
| 36 | LORD, ABBETT#36 · 152,175 sh | 152,175 | $5.7M | 0.02% | New |
| 37 | Wealthspire Advisors#37 · 141,607 sh | 141,607 | $5.3M | 0.03% | 0.0% |
| 38 | Pillsbury Lake Capital#38 · 136,746 sh | 136,746 | $5.1M | 1.40% | New |
| 39 | Informed Momentum#39 · 129,182 sh | 129,182 | $4.8M | 0.43% | New |
| 40 | Russell Investments Group, Ltd.#40 · 125,513 sh | 125,513 | $4.7M | <0.01% | -9.2% |
| 41 | SEI INVESTMENTS#41 · 118,607 sh | 118,607 | $4.4M | <0.01% | -3.5% |
| 42 | Empowered Funds#42 · 116,570 sh | 116,570 | $4.4M | 0.02% | -5.5% |
| 43 | NORTHERN#43 · 114,995 sh | 114,995 | $4.3M | <0.01% | +14.6% |
| 44 | BNP PARIBAS FINANCIAL MARKETS#44 · 112,455 sh | 112,455 | $4.2M | <0.01% | +3919.1% |
| 45 | NEEDHAM INVESTMENT MANAGEMENT#45 · 110,000 sh | 110,000 | $4.1M | 0.12% | +450.0% |
| 46 | HUNTER ASSOCIATES INVESTMENT MANAGEMENT#46 · 107,528 sh | 107,528 | $4.0M | — | New |
| 47 | Trexquant Investment#47 · 100,517 sh | 100,517 | $3.8M | 0.02% | New |
| 48 | MORGAN STANLEY#48 · 100,159 sh | 100,159 | $3.8M | <0.01% | +320.2% |
| 49 | VANGUARD FIDUCIARY#49 · 98,709 sh | 98,709 | $3.7M | <0.01% | +8.4% |
| 50 | VANGUARD PORTFOLIO MANAGEMENT#50 · 98,263 sh | 98,263 | $3.7M | <0.01% | +29.5% |
| 51 | Walleye Capital#51 · 93,444 sh | 93,444 | $3.5M | 0.01% | New |
| 52 | Qube Research & Technologies Ltd#52 · 87,129 sh | 87,129 | $3.3M | <0.01% | New |
| 53 | SUSQUEHANNA INTERNATIONAL GROUP, LLP#53 · 85,462 sh | 85,462 | $3.2M | <0.01% | New |
| 54 | UBS Group AG#54 · 82,662 sh | 82,662 | $3.1M | <0.01% | -29.1% |
| 55 | ANCHOR CAPITAL ADVISORS#55 · 80,884 sh | 80,884 | $3.0M | 0.09% | -0.7% |
| 56 | Invesco Ltd.#56 · 75,331 sh | 75,331 | $2.8M | <0.01% | +178.7% |
| 57 | FORMULA GROWTH LTD#57 · 75,000 sh | 75,000 | $2.8M | 0.99% | -25.0% |
| 58 | TOCQUEVILLE ASSET MANAGEMENT L.P.#58 · 71,100 sh | 71,100 | $2.7M | 0.04% | 0.0% |
| 59 | Panoramic Capital#59 · 70,000 sh | 70,000 | $2.6M | 1.13% | -50.0% |
| 60 | XTX Topco Ltd#60 · 65,604 sh | 65,604 | $2.5M | 0.03% | +58.2% |
| 61 | POLEN CAPITAL MANAGEMENT#61 · 61,827 sh | 61,827 | $2.3M | 0.02% | New |
| 62 | Essential Investment Partners#62 · 58,886 sh | 58,886 | $2.2M | 1.77% | +48.6% |
| 63 | CITIGROUP#63 · 52,620 sh | 52,620 | $2.0M | <0.01% | +3114.4% |
| 64 | GOLDMAN SACHS GROUP#64 · 51,990 sh | 51,990 | $1.9M | <0.01% | -19.9% |
| 65 | AMERICAN CENTURY COMPANIES#65 · 48,211 sh | 48,211 | $1.8M | <0.01% | -78.3% |
| 66 | BALYASNY ASSET MANAGEMENT L.P.#66 · 47,052 sh | 47,052 | $1.8M | <0.01% | New |
| 67 | CHARLES SCHWAB INVESTMENT MANAGEMENT#67 · 45,861 sh | 45,861 | $1.7M | <0.01% | +14.4% |
| 68 | SummerHaven Investment Management#68 · 45,325 sh | 45,325 | $1.7M | — | 0.0% |
| 69 | Bank of New York Mellon#69 · 44,873 sh | 44,873 | $1.7M | <0.01% | +15.5% |
| 70 | GatePass Capital#70 · 40,000 sh | 40,000 | $1.5M | 0.57% | New |
| 71 | OSAIC#71 · 39,614 sh | 39,614 | $1.5M | <0.01% | -60.0% |
| 72 | SHEETS SMITH WEALTH MANAGEMENT#72 · 37,897 sh | 37,897 | $1.4M | — | -2.8% |
| 73 | Diametric Capital#73 · 35,727 sh | 35,727 | $1.3M | 0.14% | New |
| 74 | Aquatic Capital Management#74 · 31,731 sh | 31,731 | $1.2M | 0.04% | +256.5% |
| 75 | Janney Montgomery Scott#75 · 31,304 sh | 31,304 | $1.2M | <0.01% | 0.0% |
| 76 | CenterBook Partners#76 · 30,992 sh | 30,992 | $1.2M | 0.06% | -74.2% |
| 77 | BOOTHBAY FUND MANAGEMENT#77 · 30,584 sh | 30,584 | $1.1M | 0.02% | New |
| 78 | North Star Investment Management#78 · 30,000 sh | 30,000 | $1.1M | 0.06% | 0.0% |
| 79 | KORNITZER CAPITAL MANAGEMENT#79 · 29,587 sh | 29,587 | $1.1M | 0.02% | New |
| 80 | HARBOR CAPITAL ADVISORS#80 · 28,625 sh | 28,625 | $1.1M | — | +267.7% |
| 81 | RENAISSANCE TECHNOLOGIES#81 · 28,000 sh | 28,000 | $1.0M | <0.01% | -55.5% |
| 82 | Divisadero Street Capital Management#82 · 27,482 sh | 27,482 | $1.0M | 0.02% | New |
| 83 | Quadrature Capital Ltd#83 · 26,477 sh | 26,477 | $991.8K | <0.01% | New |
| 84 | Johnson Financial Group#84 · 26,000 sh | 26,000 | $974.0K | 0.03% | +57.8% |
| 85 | PRELUDE CAPITAL MANAGEMENT#85 · 23,969 sh | 23,969 | $897.9K | 0.07% | New |
| 86 | LPL Financial#86 · 22,172 sh | 22,172 | $830.6K | <0.01% | +1.8% |
| 87 | O'SHAUGHNESSY ASSET MANAGEMENT#87 · 21,785 sh | 21,785 | $816.1K | <0.01% | -17.4% |
| 88 | HRT FINANCIAL#88 · 21,568 sh | 21,568 | $807.0K | <0.01% | New |
| 89 | WELLS FARGO & COMPANY#89 · 20,300 sh | 20,300 | $760.4K | <0.01% | +61.5% |
| 90 | RHUMBLINE ADVISERS#90 · 20,001 sh | 20,001 | $749.2K | <0.01% | +9.9% |
| 91 | ENVESTNET ASSET MANAGEMENT#91 · 18,920 sh | 18,920 | $708.7K | <0.01% | -6.8% |
| 92 | AQR CAPITAL MANAGEMENT#92 · 18,224 sh | 18,224 | $682.7K | <0.01% | -10.6% |
| 93 | STATE OF WISCONSIN INVESTMENT BOARD#93 · 18,171 sh | 18,171 | $680.7K | <0.01% | -43.7% |
| 94 | WESBANCO BANK#94 · 18,000 sh | 18,000 | $674.3K | 0.02% | New |
| 95 | DEUTSCHE BANK AG\#95 · 14,278 sh | 14,278 | $534.9K | <0.01% | +39.5% |
| 96 | Caption Management#96 · 14,092 sh | 14,092 | $527.9K | <0.01% | New |
| 97 | FRANKLIN RESOURCES#97 · 12,816 sh | 12,816 | $480.1K | <0.01% | -5.3% |
| 98 | WEALTH ENHANCEMENT ADVISORY SERVICES#98 · 13,946 sh | 13,946 | $470.3K | — | New |
| 99 | Numerai GP#99 · 12,410 sh | 12,410 | $464.9K | 0.04% | -68.8% |
| 100 | Creative Planning#100 · 12,159 sh | 12,159 | $455.5K | <0.01% | New |
Funds that sold out of MEC in Q2 2026 (20)
Held MEC at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.
| Institution | Shares sold | Value in Q1 2026 |
|---|---|---|
| AMERIPRISE FINANCIAL351,790 sh | 351,790 | $6.3M |
| Roubaix Capital210,657 sh | 210,657 | $3.8M |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP185,261 sh | 185,261 | $3.3M |
| Integrated Quantitative Investments50,659 sh | 50,659 | $909.3K |
| HighTower Advisors44,587 sh | 44,587 | $800.3K |
| PANAGORA ASSET MANAGEMENT36,765 sh | 36,765 | $659.9K |
| Legato Capital Management35,698 sh | 35,698 | $640.8K |
| Ancora Advisors32,133 sh | 32,133 | $576.8K |
| SummitTX Capital, L.P.18,696 sh | 18,696 | $335.6K |
| Gradient Investments17,104 sh | 17,104 | $307.0K |
| ALLIANCEBERNSTEIN L.P.12,810 sh | 12,810 | $239.8K |
| MIRABELLA FINANCIAL SERVICES LLP12,430 sh | 12,430 | $223.1K |
| MAI Capital Management414 sh | 414 | $7.4K |
| Optiver Holding B.V.124 sh | 124 | $2.2K |
| Advisory Services Network115 sh | 115 | $2.1K |
| Annis Gardner Whiting Capital Advisors80 sh | 80 | $1.4K |
| BAYBAN43 sh | 43 | $772.00 |
| Vermillion Wealth Management30 sh | 30 | $539.00 |
| True Wealth Design9 sh | 9 | $162.00 |
| Root Financial Partners5 sh | 5 | $90.00 |
Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.