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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.

New
Increased
Maintained
Reduced
Closed

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

Holders
104
Holders Change
-8
Holders Change %
-7.14%
% of All Funds
1.36%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
12
Increased
44
Reduced
29
Closed
20
Calls
$6K
Puts
–
Net Calls
+$6K
Net Calls Change
+$1K

Top Buyers

Rank Fund Capital Flow
1
Ameriprise
Ameriprise
Minnesota
+$5.33M
2
2L
22NW LP
Washington
+$3.68M
3
Boston Partners
Boston Partners
Massachusetts
+$2.98M
4
RC
Roubaix Capital
Colorado
+$1.68M
5
CP
CenterBook Partners
Connecticut
+$1.24M

Top Sellers

Rank Fund Capital Flow
1
GIM
Granahan Investment Management
Massachusetts
-$2.24M
2
AA
Ancora Advisors
Ohio
-$1.98M
3
Marshall Wace
Marshall Wace
United Kingdom
-$1.03M
4
TAM
Tocqueville Asset Management
New York
-$754K
5
Janus Henderson Group
Janus Henderson Group
United Kingdom
-$607K
Name Holding Trade Value Shares
Change 		Change in
Stake
Osaic Holdings
26
Osaic Holdings
Arizona
$1.78M -$147K -9,803 -7%
EF
27
Empowered Funds
Pennsylvania
$1.68M +$209K +13,894 +13%
GC
28
Globeflex Capital
California
$1.6M – – –
Northern Trust
29
Northern Trust
Illinois
$1.5M +$113K +7,492 +7%
UBS Group
30
UBS Group
Switzerland
$1.46M +$274K +18,220 +21%
ACA
31
Anchor Capital Advisors
Massachusetts
$1.37M +$32.2K +2,137 +2%
WANY
32
Wealthspire Advisors (New York)
New York
$1.31M – – –
Goldman Sachs
33
Goldman Sachs
New York
$1.28M +$111K +7,411 +9%
PAM
34
Panagora Asset Management
Massachusetts
$941K +$442K +29,385 +75%
AQR Capital Management
35
AQR Capital Management
Connecticut
$819K +$514K +34,166 +135%
SEI Investments
36
SEI Investments
Pennsylvania
$761K +$57.5K +3,824 +7%
SIM
37
SummerHaven Investment Management
Connecticut
$712K +$778K +51,725 New
N
38
Nuveen
North Carolina
$679K – – –
Bank of New York Mellon
39
Bank of New York Mellon
New York
$584K +$48.5K +3,225 +8%
Charles Schwab
40
Charles Schwab
California
$538K – – –
SSWM
41
Sheets Smith Wealth Management
North Carolina
$536K +$5.87K +390 +1%
Janney Montgomery Scott
42
Janney Montgomery Scott
Pennsylvania
$505K +$2.5K +166 +0.5%
Barclays
43
Barclays
United Kingdom
$505K -$57.5K -3,825 -9%
State of Wisconsin Investment Board
44
State of Wisconsin Investment Board
Wisconsin
$493K +$173K +11,500 +47%
MAM
45
Martingale Asset Management
Massachusetts
$490K -$119K -7,906 -18%
Morgan Stanley
46
Morgan Stanley
New York
$482K -$411K -27,301 -44%
PCM
47
Perritt Capital Management
Illinois
$413K – – –
OSAM
48
O'Shaughnessy Asset Management
Connecticut
$411K -$11.2K -746 -2%
Franklin Resources
49
Franklin Resources
California
$382K +$179K +11,919 +75%
Victory Capital Management
50
Victory Capital Management
Texas
$368K +$174K +11,550 +76%
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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.