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.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Envestnet Asset Management Inc | Sell | -1,381 | -6.8% | 18,920 | $708.74K | Q2 2026 | Sep 23, 2026 |
| State Street Corp | Buy | +5,318 | +1.9% | 291,168 | $10.91M | Q2 2026 | Sep 22, 2026 |
| Parkside Financial Bank & Trust | Buy | +1,630 | +4657.1% | 1,665 | $62.37K | Q2 2026 | Sep 04, 2026 |
| Anchor Capital Advisors Llc | Sell | -558 | -0.7% | 80,884 | $3.03M | Q2 2026 | Sep 03, 2026 |
| Citadel Advisors Llc | Buy | +141,926 | +249.9% | 198,712 | $7.44M | Q2 2026 | Sep 02, 2026 |
| First Eagle U.S. Value | Sell | -34,500 | -8.5% | 369,575 | $13.84M | Q2 2026 | Aug 24, 2026 |
| California State Teachers Retirement System | Sell | -524 | -74.0% | 184 | $6.89K | Q2 2026 | Aug 24, 2026 |
| Formula Growth Ltd | Sell | -25,000 | -25.0% | 75,000 | $2.81M | Q2 2026 | Aug 17, 2026 |
| Empowered Funds, Llc | Sell | -6,723 | -5.5% | 116,570 | $4.37M | Q2 2026 | Aug 17, 2026 |
| Driehaus Capital Management Llc | Buy | +846,354 | — | 846,354 | $31.70M | Q2 2026 | Aug 14, 2026 |
| Summit Partners Public Asset Management, Llc | Buy | +800,000 | — | 800,000 | $29.97M | Q2 2026 | Aug 14, 2026 |
| Portolan Capital Management, Llc | Buy | +478,120 | +58.2% | 1,299,256 | $48.67M | Q2 2026 | Aug 14, 2026 |
| Wellington Management Group Llp | Buy | +477,583 | — | 477,583 | $17.89M | Q2 2026 | Aug 14, 2026 |
| Jane Street Group, Llc | Buy | +356,151 | — | 356,151 | $13.34M | Q2 2026 | Aug 14, 2026 |
| Ophir Asset Management Pty Ltd | Buy | +326,699 | — | 326,699 | $12.24M | Q2 2026 | Aug 14, 2026 |
| Kennedy Capital Management Llc | Buy | +229,586 | +215.0% | 336,377 | $12.60M | Q2 2026 | Aug 14, 2026 |
| Awm Investment Company, Inc. | Buy | +180,000 | — | 180,000 | $6.74M | Q2 2026 | Aug 14, 2026 |
| Osterweis Capital Management Inc | Buy | +174,600 | — | 174,600 | $6.54M | Q2 2026 | Aug 14, 2026 |
| Tudor Investment Corp Et Al | Buy | +169,848 | — | 169,848 | $6.36M | Q2 2026 | Aug 14, 2026 |
| Two Sigma Investments, Lp | Buy | +164,204 | +473.1% | 198,912 | $7.45M | Q2 2026 | Aug 14, 2026 |
| Lord, Abbett & Co. Llc | Buy | +152,175 | — | 152,175 | $5.70M | Q2 2026 | Aug 14, 2026 |
| Pillsbury Lake Capital Llc | Buy | +136,746 | — | 136,746 | $5.12M | Q2 2026 | Aug 14, 2026 |
| Squarepoint Ops Llc | Buy | +128,197 | +115.9% | 238,766 | $8.94M | Q2 2026 | Aug 14, 2026 |
| Millennium Management Llc | Sell | -127,295 | -33.4% | 253,677 | $9.50M | Q2 2026 | Aug 14, 2026 |
| Trexquant Investment Lp | Buy | +100,517 | — | 100,517 | $3.77M | Q2 2026 | Aug 14, 2026 |
| Bank Of America Corp | Buy | +92,718 | +50.5% | 276,317 | $10.35M | Q2 2026 | Aug 14, 2026 |
| Needham Investment Management Llc | Buy | +90,000 | +450.0% | 110,000 | $4.12M | Q2 2026 | Aug 14, 2026 |
| Qube Research & Technologies Ltd | Buy | +87,129 | — | 87,129 | $3.26M | Q2 2026 | Aug 14, 2026 |
| Susquehanna International Group, Llp | Buy | +85,462 | — | 85,462 | $3.20M | Q2 2026 | Aug 14, 2026 |
| Invesco Ltd. | Buy | +75,331 | — | 75,331 | $2.82M | Q2 2026 | Aug 14, 2026 |
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.
Related MEC Institutional Insights
- MEC Overview
- MEC 13F Institutional Holders
- MEC Top Institutional Shareholders
- Industrials Sector Institutional Ownership
- Industrials Sector Portfolio Overlap
- Institutional Portfolio Overlap & Shared Holdings
- Most Bought Industrials Stocks By Institutional Investors
- Most Sold Industrials Stocks By Institutional Investors
- MEC Insider Trading & SEC Form 4 Activity
- MEC Articles
- Top Institutional Investor Stock Rankings