MAYVILLE ENGINEERING CO INC (MEC) Institutional Shareholders
MAYVILLE ENGINEERING CO INC (MEC) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $338.10M in MEC holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of MEC tracked by InsiderSet, reporting ownership valued at approximately $44.33M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $28.62M, representing an estimated loss of -35.45% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 58% of the total disclosed MEC value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Allspring Global Investments Holdings, Llc, Boston Partners, and several other long-term asset managers with concentrated positions in MAYVILLE ENGINEERING CO INC (MEC).
This page ranks the largest institutional MEC shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
126
Total Reported Value
$338.10M
Largest Holder
Blackrock, Inc.
Largest Position
$44.33M
Insider Transactions (90d)
6
Latest Filing Quarter
Q2 2026
New Institutional Positions
154
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 1,183,443 | $44,331,785 | $28,615,652 | -$15,716,133 | -35.45% | |
| Allspring Global Investments Holdings, Llc | 0.06% | 2,000,350 | $35,846,272 | $48,368,463 | +$12,522,191 | +34.93% | |
| Boston Partners | 0.02% | 696,429 | $25,813,603 | $16,839,653 | -$8,973,950 | -34.76% | |
| Dimensional Fund Advisors Lp | 0.00% | 926,216 | $16,624,513 | $22,395,903 | +$5,771,390 | +34.72% | |
| Portolan Capital Management, Llc | 0.78% | 821,136 | $14,739,391 | $19,855,068 | +$5,115,677 | +34.71% | |
| First Eagle U.S. Value | Jean-Marie Eveillard | 0.02% | 369,575 | $13,844,280 | $8,936,324 | -$4,907,957 | -35.45% |
| Royce & Associates Lp | 0.13% | 751,001 | $13,480,468 | $18,159,204 | +$4,678,736 | +34.71% | |
| Evr Research Lp | 6.34% | 620,000 | $11,129,000 | $14,991,600 | +$3,862,600 | +34.71% | |
| State Street Corp | 0.00% | 291,168 | $10,907,153 | $7,040,442 | -$3,866,711 | -35.45% | |
| Vanguard Capital Management Llc | 0.00% | 594,938 | $10,679,137 | $14,385,601 | +$3,706,464 | +34.71% | |
| Blair William & Co/Il | 0.03% | 565,300 | $10,147,135 | $13,668,954 | +$3,521,819 | +34.71% | |
| Granahan Investment Management, Llc | 0.34% | 387,470 | $6,955,087 | $9,369,025 | +$2,413,938 | +34.71% | |
| Millennium Management Llc | 0.01% | 380,972 | $6,838,447 | $9,211,903 | +$2,373,456 | +34.71% | |
| Ameriprise Financial Inc | 0.00% | 351,790 | $6,314,631 | $8,506,282 | +$2,191,651 | +34.71% | |
| Geode Capital Management, Llc | 0.00% | 335,835 | $6,029,901 | $8,120,490 | +$2,090,589 | +34.67% | |
| Silvercrest Asset Management Group Llc | 0.03% | 269,681 | $4,840,774 | $6,520,887 | +$1,680,113 | +34.71% | |
| Russell Investments Group, Ltd. | 0.00% | 125,513 | $4,701,717 | $3,034,904 | -$1,666,813 | -35.45% | |
| Jb Capital Partners Lp | 0.77% | 250,512 | $4,496,690 | $6,057,380 | +$1,560,690 | +34.71% | |
| Congruence Capital, Llc | 1.41% | 234,475 | $4,208,827 | $5,669,606 | +$1,460,779 | +34.71% | |
| Bridgeway Capital Management, Llc | 0.08% | 222,703 | $3,997,519 | $5,384,959 | +$1,387,440 | +34.71% | |
| American Century Companies Inc | 0.00% | 221,673 | $3,979,030 | $5,360,053 | +$1,381,023 | +34.71% | |
| Roubaix Capital, Llc | 1.76% | 210,657 | $3,781,293 | $5,093,686 | +$1,312,393 | +34.71% | |
| Walleye Capital Llc | 0.02% | 93,444 | $3,500,412 | $2,259,476 | -$1,240,936 | -35.45% | |
| Arrowstreet Capital, Limited Partnership | 0.00% | 185,261 | $3,325,435 | $4,479,611 | +$1,154,176 | +34.71% | |
| Bank Of America Corp | 0.00% | 183,599 | $3,295,601 | $4,439,424 | +$1,143,823 | +34.71% | |
| Anchor Capital Advisors Llc | 0.09% | 80,884 | $3,029,915 | $1,955,775 | -$1,074,140 | -35.45% | |
| Wealthspire Advisors, Llc | 0.02% | 141,607 | $2,541,846 | $3,424,057 | +$882,211 | +34.71% | |
| Panoramic Capital, Llc | 1.76% | 140,000 | $2,513,000 | $3,385,200 | +$872,200 | +34.71% | |
| Polen Capital Management | David M. Polen | 0.02% | 61,827 | $2,316,039 | $1,494,977 | -$821,062 | -35.45% |
| Empowered Funds, Llc | 0.01% | 123,293 | $2,213,109 | $2,981,225 | +$768,116 | +34.71% | |
| Sei Investments Co | 0.00% | 122,878 | $2,205,660 | $2,971,190 | +$765,530 | +34.71% | |
| Centerbook Partners Lp | 0.12% | 120,303 | $2,159,439 | $2,908,927 | +$749,488 | +34.71% | |
| Ubs Group Ag | 0.00% | 116,571 | $2,092,449 | $2,818,687 | +$726,238 | +34.71% | |
| Squarepoint Ops Llc | 0.00% | 110,569 | $1,984,714 | $2,673,558 | +$688,844 | +34.71% | |
| Citigroup Inc | 0.00% | 52,620 | $1,971,146 | $1,272,352 | -$698,794 | -35.45% | |
| Kennedy Capital Management Llc | 0.04% | 106,791 | $1,916,898 | $2,582,206 | +$665,308 | +34.71% | |
| Northern Trust Corp | 0.00% | 100,384 | $1,801,893 | $2,427,285 | +$625,392 | +34.71% | |
| Formula Growth Ltd | 0.81% | 100,000 | $1,795,000 | $2,418,000 | +$623,000 | +34.71% | |
| Osaic Holdings, Inc. | 0.00% | 99,104 | $1,778,880 | $2,396,335 | +$617,455 | +34.71% | |
| Summerhaven Investment Management, Llc | 0.91% | 45,325 | $1,697,875 | $1,095,959 | -$601,917 | -35.45% | |
| Bank Of New York Mellon Corp | 0.00% | 44,873 | $1,680,943 | $1,085,029 | -$595,914 | -35.45% | |
| Vanguard Fiduciary Trust Co | 0.00% | 91,044 | $1,634,240 | $2,201,444 | +$567,204 | +34.71% | |
| Gatepass Capital, Llc | 0.57% | 40,000 | $1,498,400 | $967,200 | -$531,200 | -35.45% | |
| Sheets Smith Wealth Management | 0.14% | 37,897 | $1,419,622 | $916,349 | -$503,273 | -35.45% | |
| Vanguard Portfolio Management Llc | 0.00% | 75,903 | $1,362,459 | $1,835,335 | +$472,876 | +34.71% | |
| Tocqueville Asset Management L.P. | 0.02% | 71,100 | $1,276,245 | $1,719,198 | +$442,953 | +34.71% | |
| Goldman Sachs Group Inc | 0.00% | 64,908 | $1,165,098 | $1,569,475 | +$404,377 | +34.71% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 62,900 | $1,129,055 | $1,520,922 | +$391,867 | +34.71% |
| North Star Investment Management Corp. | 0.06% | 30,000 | $1,123,800 | $725,400 | -$398,400 | -35.45% | |
| Kornitzer Capital Management Inc | 0.02% | 29,587 | $1,108,329 | $715,414 | -$392,915 | -35.45% |
Frequently asked questions about MEC
Who owns the most MEC stock?
The largest holders of MEC are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for MAYVILLE ENGINEERING CO INC (MEC).
Is MEC widely held by superinvestors?
Many widely followed stocks like MEC appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MEC is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.