Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in MEC held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Allspring Global Investments Holdings, LLC | 2.0M | $35.8M | -2.5% | 9.845% | 0.06% |
| 2 | DIMENSIONAL FUND ADVISORS LP | 926K | $16.6M | +5.6% | 4.559% | 0.00% |
| 3 | BlackRock, Inc. | 882K | $15.8M | +1.9% | 4.340% | 0.00% |
| 4 | Portolan Capital Management, LLC | 821K | $14.7M | +60.1% | 4.041% | 0.78% |
| 5 | ROYCE & ASSOCIATES LP | 751K | $13.5M | +20.3% | 3.696% | 0.13% |
| 6 | EVR Research LP | 620K | $11.1M | +2.5% | 3.051% | 6.34% |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | 595K | $10.7M | — | 2.928% | 0.00% |
| 8 | BLAIR WILLIAM & CO/IL | 565K | $10.1M | -3.2% | 2.782% | 0.03% |
| 9 | First Eagle Investment Management, LLC | 404K | $7.3M | +12.8% | 1.989% | 0.01% |
| 10 | GRANAHAN INVESTMENT MANAGEMENT INC/MA | 387K | $7.0M | +44.7% | 1.907% | 0.34% |
| 11 | MILLENNIUM MANAGEMENT LLC | 381K | $6.8M | +148.7% | 1.875% | 0.00% |
| 12 | AMERIPRISE FINANCIAL INC | 352K | $6.3M | +0.3% | 1.731% | 0.00% |
| 13 | GEODE CAPITAL MANAGEMENT, LLC | 336K | $6.0M | +2.1% | 1.653% | 0.00% |
| 14 | STATE STREET CORP | 286K | $5.1M | +0.3% | 1.407% | 0.00% |
| 15 | SILVERCREST ASSET MANAGEMENT GROUP LLC | 270K | $4.8M | +49.9% | 1.327% | 0.03% |
| 16 | JB CAPITAL PARTNERS LP | 251K | $4.5M | 0.0% | 1.233% | 0.77% |
| 17 | Congruence Capital, LLC | 234K | $4.2M | +12.7% | 1.154% | 1.41% |
| 18 | Boston Partners | 233K | $4.2M | +4.5% | 1.145% | 0.00% |
| 19 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 223K | $4.0M | -1.9% | 1.096% | 0.08% |
| 20 | AMERICAN CENTURY COMPANIES INC | 222K | $4.0M | -21.1% | 1.091% | 0.00% |
| 21 | Roubaix Capital, LLC | 211K | $3.8M | +44.0% | 1.037% | 1.76% |
| 22 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 185K | $3.3M | -35.8% | 0.912% | 0.00% |
| 23 | BANK OF AMERICA CORP /DE/ | 184K | $3.3M | -16.1% | 0.904% | 0.00% |
| 24 | Wealthspire Advisors, LLC | 142K | $2.5M | +48.4% | 0.697% | 0.02% |
| 25 | Panoramic Capital, LLC | 140K | $2.5M | — | 0.689% | 1.76% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in MEC — a direct measure of their conviction.
Filings activity in MEC during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 121 | +0.8% | 35.64% | 0.32 pp | $257M | 0.9% |
| Q4 2025 | 120 | +18% | 35.96% | +10.57 pp | $259M | +42% |
| Q3 2025 | 102 | 8.9% | 25.39% | 2.40 pp | $183M | 8.7% |
| Q2 2025 | 112 | 4.3% | 27.79% | +5.06 pp | $200M | +22% |
| Q1 2025 | 117 | +2.6% | 22.73% | 4.19 pp | $164M | 16% |
| Q4 2024 | 114 | 1.7% | 26.92% | 6.59 pp | $194M | 20% |
| Q3 2024 | 116 | +17% | 33.51% | +6.73 pp | $242M | +25% |
| Q2 2024 | 99 | — | 26.78% | — | $193M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying MEC stock.
Based on Q1 2026 13F filings, institutional ownership of Mayville Engineering Company, Inc. stands at 35.6%, held across 121 reporting institutions.
Allspring Global Investments Holdings, LLC is the largest reported institutional holder of MEC, with approximately 2,000,350 shares worth $0.04B as of Q1 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of MEC, including MILLENNIUM MANAGEMENT LLC.
Our composite Smart Money Score for MEC is 44 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
23 institutions opened new positions in MEC during Q1 2026, while 22 fully exited. 30 added to existing positions and 67 trimmed.
MEC institutional ownership fell by 0.32 percentage points quarter-over-quarter, with a net change of +1 holders.
The top 10 institutions account for 55.5% of all reported 13F value in MEC, and the top 25 account for 81.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Mayville Engineering Company, Inc. (MEC) Institutional Ownership