MAYVILLE ENGINEERING CO INC (MEC) Institutional Ownership Changes & 13F Activity

MAYVILLE ENGINEERING CO INC (MEC). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Driehaus Capital Management Llc, Summit Partners Public Asset Management, Llc, Portolan Capital Management, Llc, Wellington Management Group Llp, and Jane Street Group, Llc.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Envestnet Asset Management IncSell-1,381-6.8%18,920$708.74KQ2 2026Sep 23, 2026
State Street CorpBuy+5,318+1.9%291,168$10.91MQ2 2026Sep 22, 2026
Parkside Financial Bank & TrustBuy+1,630+4657.1%1,665$62.37KQ2 2026Sep 04, 2026
Anchor Capital Advisors LlcSell-558-0.7%80,884$3.03MQ2 2026Sep 03, 2026
Citadel Advisors LlcBuy+141,926+249.9%198,712$7.44MQ2 2026Sep 02, 2026
First Eagle U.S. ValueSell-34,500-8.5%369,575$13.84MQ2 2026Aug 24, 2026
California State Teachers Retirement SystemSell-524-74.0%184$6.89KQ2 2026Aug 24, 2026
Formula Growth LtdSell-25,000-25.0%75,000$2.81MQ2 2026Aug 17, 2026
Empowered Funds, LlcSell-6,723-5.5%116,570$4.37MQ2 2026Aug 17, 2026
Driehaus Capital Management LlcBuy+846,354846,354$31.70MQ2 2026Aug 14, 2026
Summit Partners Public Asset Management, LlcBuy+800,000800,000$29.97MQ2 2026Aug 14, 2026
Portolan Capital Management, LlcBuy+478,120+58.2%1,299,256$48.67MQ2 2026Aug 14, 2026
Wellington Management Group LlpBuy+477,583477,583$17.89MQ2 2026Aug 14, 2026
Jane Street Group, LlcBuy+356,151356,151$13.34MQ2 2026Aug 14, 2026
Ophir Asset Management Pty LtdBuy+326,699326,699$12.24MQ2 2026Aug 14, 2026
Kennedy Capital Management LlcBuy+229,586+215.0%336,377$12.60MQ2 2026Aug 14, 2026
Awm Investment Company, Inc.Buy+180,000180,000$6.74MQ2 2026Aug 14, 2026
Osterweis Capital Management IncBuy+174,600174,600$6.54MQ2 2026Aug 14, 2026
Tudor Investment Corp Et AlBuy+169,848169,848$6.36MQ2 2026Aug 14, 2026
Two Sigma Investments, LpBuy+164,204+473.1%198,912$7.45MQ2 2026Aug 14, 2026
Lord, Abbett & Co. LlcBuy+152,175152,175$5.70MQ2 2026Aug 14, 2026
Pillsbury Lake Capital LlcBuy+136,746136,746$5.12MQ2 2026Aug 14, 2026
Squarepoint Ops LlcBuy+128,197+115.9%238,766$8.94MQ2 2026Aug 14, 2026
Millennium Management LlcSell-127,295-33.4%253,677$9.50MQ2 2026Aug 14, 2026
Trexquant Investment LpBuy+100,517100,517$3.77MQ2 2026Aug 14, 2026
Bank Of America CorpBuy+92,718+50.5%276,317$10.35MQ2 2026Aug 14, 2026
Needham Investment Management LlcBuy+90,000+450.0%110,000$4.12MQ2 2026Aug 14, 2026
Qube Research & Technologies LtdBuy+87,12987,129$3.26MQ2 2026Aug 14, 2026
Susquehanna International Group, LlpBuy+85,46285,462$3.20MQ2 2026Aug 14, 2026
Invesco Ltd.Buy+75,33175,331$2.82MQ2 2026Aug 14, 2026
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Frequently asked questions about MEC activity

  • Which institutional owners are buying MEC?

    Institutional owners buying MEC include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in MEC activity?

    "Buy" means an investor increased their reported position in MEC compared to the prior reporting period. This reflects growing exposure to MAYVILLE ENGINEERING CO INC (MEC) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in MEC increasing?

    Institutional interest in MEC can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.