Mayville Engineering Co
MEC
104 hedge funds and large institutions have $184M invested in Mayville Engineering Co in 2025 Q3 according to their latest regulatory filings, with 12 funds opening new positions, 44 increasing their positions, 29 reducing their positions, and 20 closing their positions.
52% more repeat investments, than reductions
Existing positions increased: 44 | Existing positions reduced: 29
3.58% more ownership
Funds ownership: 61.79% → 65.36% (+3.6%)
7% less funds holding
Funds holding: 112 → 104 (-8)
9% less capital invested
Capital invested by funds: $203M → $184M (-$19M)
40% less first-time investments, than exits
New positions opened: 12 | Existing positions closed: 20
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Ameriprise
Minneapolis,
Minnesota
|
+$5.33M |
| 2 |
2L
22NW LP
Seattle,
Washington
|
+$3.68M |
| 3 |
Boston Partners
Boston,
Massachusetts
|
+$2.98M |
| 4 |
RC
Roubaix Capital
Denver,
Colorado
|
+$1.68M |
| 5 |
CP
CenterBook Partners
Greenwich,
Connecticut
|
+$1.24M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
GIM
Granahan Investment Management
Waltham,
Massachusetts
|
-$2.24M |
| 2 |
AA
Ancora Advisors
Cleveland,
Ohio
|
-$1.98M |
| 3 |
Marshall Wace
London,
United Kingdom
|
-$1.03M |
| 4 |
TAM
Tocqueville Asset Management
New York
|
-$754K |
| 5 |
Janus Henderson Group
London,
United Kingdom
|
-$607K |
MEC Hedge Fund Activity: Q3 2025 in Review
104 of the 7,620 institutional investors tracked by Wall St. Rank reported a position in Mayville Engineering Co (MEC) for Q3 2025, worth a combined $184M — down 9.4% from $203M a quarter earlier.
Sellers outnumbered buyers: 20 funds closed out of MEC and 12 opened new positions — a net loss of 8 holders — while 29 trimmed existing stakes and 44 added.
The largest buyer was Ameriprise, adding an estimated $5.33M. The largest seller was Granahan Investment Management, cutting an estimated $2.24M.
- 104 institutional investors held Mayville Engineering Co (MEC) as of Q3 2025, down from 112 in Q2 2025.
- Funds reported $184M of Mayville Engineering Co stock for Q3 2025, down 9.4% quarter-over-quarter.
- 12 funds opened new Mayville Engineering Co positions in Q3 2025 and 20 closed out, a net change of -8 holders.
- The largest Mayville Engineering Co buyer in Q3 2025 was Ameriprise, an estimated $5.33M added.
- The largest Mayville Engineering Co seller in Q3 2025 was Granahan Investment Management, an estimated $2.24M sold.
Based on aggregated 13F filings for Q3 2025.