MAYVILLE ENGINEERING CO INC (MEC) Top 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 March 31, 2026. The institutional investors covered on this page collectively reported approximately $256.89M in MEC holdings during the latest filing period.
Allspring Global Investments Holdings, Llc is currently the largest disclosed institutional shareholder of MEC tracked by InsiderSet, reporting ownership valued at approximately $35.85M in its March 31, 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 $67.03M, representing an estimated gain of +87.00% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 56% of the total disclosed MEC value among the investors covered in this analysis. Major shareholders include Allspring Global Investments Holdings, Llc, Dimensional Fund Advisors Lp, Blackrock, Inc., 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
121
Total Reported Value
$256.89M
Largest Holder
Allspring Global Investments Holdings, Llc
Largest Position
$35.85M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
141
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Allspring Global Investments Holdings, Llc | 0.06% | 2,000,350 | $35,846,272 | $67,031,728 | +$31,185,456 | +87.00% | |
| Dimensional Fund Advisors Lp | 0.00% | 926,216 | $16,624,513 | $31,037,498 | +$14,412,985 | +86.70% | |
| Blackrock, Inc. | 0.00% | 881,854 | $15,829,285 | $29,550,928 | +$13,721,643 | +86.69% | |
| Portolan Capital Management, Llc | 0.78% | 821,136 | $14,739,391 | $27,516,267 | +$12,776,876 | +86.69% | |
| Royce & Associates Lp | 0.13% | 751,001 | $13,480,468 | $25,166,044 | +$11,685,576 | +86.69% | |
| Evr Research Lp | 6.34% | 620,000 | $11,129,000 | $20,776,200 | +$9,647,200 | +86.69% | |
| Vanguard Capital Management Llc | 0.00% | 594,938 | $10,679,137 | $19,936,372 | +$9,257,235 | +86.69% | |
| Blair William & Co/Il | 0.03% | 565,300 | $10,147,135 | $18,943,203 | +$8,796,068 | +86.69% | |
| First Eagle U.S. Value | Jean-Marie Eveillard | 0.01% | 404,075 | $7,253,146 | $13,540,553 | +$6,287,407 | +86.69% |
| Granahan Investment Management, Llc | 0.34% | 387,470 | $6,955,087 | $12,984,120 | +$6,029,033 | +86.69% | |
| Millennium Management Llc | 0.01% | 380,972 | $6,838,447 | $12,766,372 | +$5,927,925 | +86.69% | |
| Ameriprise Financial Inc | 0.00% | 351,790 | $6,314,631 | $11,788,483 | +$5,473,852 | +86.69% | |
| Geode Capital Management, Llc | 0.00% | 335,835 | $6,029,901 | $11,253,831 | +$5,223,930 | +86.63% | |
| State Street Corp | 0.00% | 285,850 | $5,131,008 | $9,578,834 | +$4,447,826 | +86.69% | |
| Silvercrest Asset Management Group Llc | 0.03% | 269,681 | $4,840,774 | $9,037,010 | +$4,196,236 | +86.69% | |
| Jb Capital Partners Lp | 0.77% | 250,512 | $4,496,690 | $8,394,657 | +$3,897,967 | +86.69% | |
| Congruence Capital, Llc | 1.41% | 234,475 | $4,208,827 | $7,857,257 | +$3,648,430 | +86.69% | |
| Boston Partners | 0.00% | 232,637 | $4,175,830 | $7,795,666 | +$3,619,836 | +86.69% | |
| Bridgeway Capital Management, Llc | 0.08% | 222,703 | $3,997,519 | $7,462,778 | +$3,465,259 | +86.69% | |
| American Century Companies Inc | 0.00% | 221,673 | $3,979,030 | $7,428,262 | +$3,449,232 | +86.69% | |
| Roubaix Capital, Llc | 1.76% | 210,657 | $3,781,293 | $7,059,116 | +$3,277,823 | +86.69% | |
| Arrowstreet Capital, Limited Partnership | 0.00% | 185,261 | $3,325,435 | $6,208,096 | +$2,882,661 | +86.69% | |
| Bank Of America Corp | 0.00% | 183,599 | $3,295,601 | $6,152,402 | +$2,856,801 | +86.69% | |
| Wealthspire Advisors, Llc | 0.02% | 141,607 | $2,541,846 | $4,745,251 | +$2,203,405 | +86.69% | |
| Panoramic Capital, Llc | 1.76% | 140,000 | $2,513,000 | $4,691,400 | +$2,178,400 | +86.69% | |
| Russell Investments Group, Ltd. | 0.00% | 138,215 | $2,480,969 | $4,631,585 | +$2,150,616 | +86.68% | |
| Empowered Funds, Llc | 0.01% | 123,293 | $2,213,109 | $4,131,548 | +$1,918,439 | +86.69% | |
| Sei Investments Co | 0.00% | 122,878 | $2,205,660 | $4,117,642 | +$1,911,982 | +86.69% | |
| Centerbook Partners Lp | 0.12% | 120,303 | $2,159,439 | $4,031,354 | +$1,871,915 | +86.69% | |
| Ubs Group Ag | 0.00% | 116,571 | $2,092,449 | $3,906,294 | +$1,813,845 | +86.69% | |
| Squarepoint Ops Llc | 0.00% | 110,569 | $1,984,714 | $3,705,167 | +$1,720,453 | +86.69% | |
| Kennedy Capital Management Llc | 0.04% | 106,791 | $1,916,898 | $3,578,566 | +$1,661,668 | +86.69% | |
| Northern Trust Corp | 0.00% | 100,384 | $1,801,893 | $3,363,868 | +$1,561,975 | +86.69% | |
| Formula Growth Ltd | 0.81% | 100,000 | $1,795,000 | $3,351,000 | +$1,556,000 | +86.69% | |
| Osaic Holdings, Inc. | 0.00% | 99,104 | $1,778,880 | $3,320,975 | +$1,542,095 | +86.69% | |
| Vanguard Fiduciary Trust Co | 0.00% | 91,044 | $1,634,240 | $3,050,884 | +$1,416,644 | +86.69% | |
| Anchor Capital Advisors Llc | 0.04% | 81,442 | $1,461,884 | $2,729,121 | +$1,267,237 | +86.69% | |
| Vanguard Portfolio Management Llc | 0.00% | 75,903 | $1,362,459 | $2,543,510 | +$1,181,051 | +86.69% | |
| Tocqueville Asset Management L.P. | 0.02% | 71,100 | $1,276,245 | $2,382,561 | +$1,106,316 | +86.69% | |
| Goldman Sachs Group Inc | 0.00% | 64,908 | $1,165,098 | $2,175,067 | +$1,009,969 | +86.69% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 62,900 | $1,129,055 | $2,107,779 | +$978,724 | +86.69% |
| Citadel Advisors Llc | 0.00% | 56,786 | $1,019,309 | $1,902,899 | +$883,590 | +86.69% | |
| Integrated Quantitative Investments Llc | 0.16% | 50,659 | $909,329 | $1,697,583 | +$788,254 | +86.69% | |
| Nuveen, Llc | 0.00% | 47,418 | $851,154 | $1,588,977 | +$737,823 | +86.69% | |
| Summerhaven Investment Management, Llc | 0.50% | 45,325 | $813,584 | $1,518,841 | +$705,257 | +86.69% | |
| Hightower Advisors, Llc | 0.00% | 44,587 | $800,337 | $1,494,110 | +$693,773 | +86.69% | |
| Journey Strategic Wealth Llc | 0.02% | 44,206 | $793,498 | $1,481,343 | +$687,845 | +86.69% | |
| Xtx Topco Ltd | 0.01% | 41,478 | $744,530 | $1,389,928 | +$645,398 | +86.69% | |
| Charles Schwab Investment Management Inc | 0.00% | 40,098 | $719,759 | $1,343,684 | +$623,925 | +86.69% | |
| Numerai Gp Llc | 0.07% | 39,755 | $713,602 | $1,332,190 | +$618,588 | +86.69% |
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.