Mayville Engineering (MEC)
Builds fabricated, coated, extruded, and assembled components for industrial OEMs.
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13F · 13D/G · Form 4
| Institutions | ≈ 99.15% | 20.84M shares | |
|---|---|---|---|
| 167 holders · as of Jun 30, 2026 · largest filers plus last quarter's tail | |||
| Insiders | 3.97% | 834.0K shares | |
| 12 holders · as of Aug 7, 2026 | |||
| Adds to | 103.12% | ||
21.02M company shares as of Sep 10, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
Two share counts disagree (25.50M in the company's Sep 23, 2026 report, 21.02M elsewhere); stakes use the report.
This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.
These groups come from separate filings that can overlap, so they add to 103.12%; nothing is left for Other.
13F, as of Jun 30, 2026
167 holders · 20.84M shares · 57 new positions · 101 increased · 40 reduced · 22 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Portolan Capital Management, LLC | 1.30M | 6.18% | +478.1K | Aug 14, 2026 |
| FMR LLC | 1.28M | 6.09% | +1.28M | Aug 13, 2026 |
| BlackRock, Inc. | 1.18M | 5.63% | +301.6K | Aug 7, 2026 |
| Allspring Global Investments Holdings, LLC | 1.07M | 5.10% | −927.4K | Aug 13, 2026 |
| Driehaus Capital Management LLC | 846.4K | 4.03% | +846.4Knew | Aug 14, 2026 |
| Summit Partners Public Asset Management, LLC | 800.0K | 3.81% | +800.0Knew | Aug 14, 2026 |
| Dimensional Fund Advisors LP | 782.3K | 3.72% | −143.9K | Aug 11, 2026 |
| Royce & Associates LP | 752.1K | 3.58% | +1.1K | Aug 14, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Allspring Global Investments Holdings, LLC | 10.10% | 2.05M | 13G | Jan 8, 2026 |
| Portolan Capital Management, LLC | 5.92% | 1.47M | 13G | May 28, 2026 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 6, 2026 | Sean P. Leubaofficer: SVP, GC & Secretary | Sale | 12,855 | $25.44 | 6,633 |
| Jun 11, 2026 | Jagadeesh A. Reddydirector, officer: President & CEO | Sale | 15,688 | $35.05 | 124,105 |
| Jun 8, 2026 | Jagadeesh A. Reddydirector, officer: President & CEO | Sale | 1,300 | $35.01 | 139,793 |
| Jun 1, 2026 | Jagadeesh A. Reddydirector, officer: President & CEO | Sale · 2 lots | 35,236 | $30.00 | 140,445 |
| May 26, 2026 | Ryan F. Raberofficer: EVP - Strategy, Sales & Mktg | Sale | 20,000 | $26.00 | 86,970 |
| May 21, 2026 | Craig D. Nicholsofficer: SVP, Operations & Supply Chain | Sale | 4,000 | $23.24 | 146 |
| May 7, 2026 | Jagadeesh A. Reddydirector, officer: President & CEO | Sale · 2 lots | 21,796 | $25.93 | 158,387 |
| Mar 5, 2026 | Sean P. Leubaofficer: GC & Secretary | Sale · 2 lots | 9,198 | $19.15 | 11,841 |
| Dec 11, 2025 | Steven L. Fisherdirector | Sale · 2 lots | 10,000 | $19.11 | 30,482 |
| Nov 25, 2025 | Ryan F. Raberofficer: EVP - Strategy, Sales & Mktg | Sale · 2 lots | 15,000 | $16.68 | 91,018 |
House and Senate disclosures
Not reported.