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Mayville Engineering Co
MEC

112 hedge funds and large institutions have $203M invested in Mayville Engineering Co in 2025 Q2 according to their latest regulatory filings, with 14 funds opening new positions, 47 increasing their positions, 31 reducing their positions, and 18 closing their positions.

New
Increased
Maintained
Reduced
Closed

250% more call options, than puts

Call options by funds: $7K | Put options by funds: $2K

52% more repeat investments, than reductions

Existing positions increased: 47 | Existing positions reduced: 31

21% more capital invested

Capital invested by funds: $168M → $203M (+$34.7M)

0.88% more ownership

Funds ownership: 60.91% → 61.79% (+0.88%)

3% less funds holding

Funds holding: 116 → 112 (-4)

22% less first-time investments, than exits

New positions opened: 14 | Existing positions closed: 18

Holders
112
Holders Change
-4
Holders Change %
-3.45%
% of All Funds
1.47%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
14
Increased
47
Reduced
31
Closed
18
Calls
$7K
Puts
$2K
Net Calls
+$5K
Net Calls Change
+$44K

Top Buyers

Rank Fund Capital Flow
1
William Blair & Company
William Blair & Company
Illinois
+$4.02M
2
Vanguard Group
Vanguard Group
Pennsylvania
+$3.8M
3
2L
22NW LP
Washington
+$2.22M
4
RC
Roubaix Capital
Colorado
+$1.44M
5
BlackRock
BlackRock
New York
+$909K

Top Sellers

Rank Fund Capital Flow
1
NC
Nokomis Capital
Texas
-$4.66M
2
Citadel Advisors
Citadel Advisors
Florida
-$1.83M
3
PAMP
Polar Asset Management Partners
Ontario, Canada
-$1.76M
4
Millennium Management
Millennium Management
New York
-$1.51M
5
Squarepoint
Squarepoint
New York
-$932K
Name Holding Trade Value Shares
Change 		Change in
Stake
RC
26
Roubaix Capital
Colorado
$1.61M +$1.44M +101,138 New
ACA
27
Anchor Capital Advisors
Massachusetts
$1.56M -$45.9K -3,211 -3%
WANY
28
Wealthspire Advisors (New York)
New York
$1.52M – – –
CP
29
CenterBook Partners
Connecticut
$1.52M -$49.5K -3,467 -4%
UBS Group
30
UBS Group
Switzerland
$1.4M +$877K +61,375 +235%
Goldman Sachs
31
Goldman Sachs
New York
$1.37M -$399K -27,963 -25%
Marshall Wace
32
Marshall Wace
United Kingdom
$1.03M -$526K -36,806 -36%
Morgan Stanley
33
Morgan Stanley
New York
$994K +$478K +33,451 +116%
SEI Investments
34
SEI Investments
Pennsylvania
$822K +$87.2K +6,103 +13%
N
35
Nuveen
North Carolina
$787K +$20.3K +1,420 +3%
MAM
36
Martingale Asset Management
Massachusetts
$695K -$18.6K -1,299 -3%
Barclays
37
Barclays
United Kingdom
$646K +$155K +10,865 +37%
Ameriprise
38
Ameriprise
Minnesota
$633K +$42.3K +2,958 +8%
Bank of New York Mellon
39
Bank of New York Mellon
New York
$626K +$30.4K +2,126 +6%
Charles Schwab
40
Charles Schwab
California
$625K +$69.7K +4,879 +14%
PAM
41
Panagora Asset Management
Massachusetts
$622K +$557K +38,987 New
SSWM
42
Sheets Smith Wealth Management
North Carolina
$616K +$9.71K +680 +2%
Janus Henderson Group
43
Janus Henderson Group
United Kingdom
$607K +$543K +38,013 New
Janney Montgomery Scott
44
Janney Montgomery Scott
Pennsylvania
$583K +$2.71K +190 +0.5%
SO
45
STRS Ohio
Ohio
$496K -$34.3K -2,400 -7%
Royal Bank of Canada
46
Royal Bank of Canada
Ontario, Canada
$492K +$181K +12,688 +70%
OSAM
47
O'Shaughnessy Asset Management
Connecticut
$488K +$243 +17 +0.1%
PCM
48
Perritt Capital Management
Illinois
$479K – – –
Invesco
49
Invesco
Georgia
$470K -$47.8K -3,346 -10%
EEL
50
Expect Equity LLC
Maryland
$451K -$376K -26,341 -48%
1
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MEC Hedge Fund Activity: Q2 2025 in Review

112 of the 7,595 institutional investors tracked by Wall St. Rank reported a position in Mayville Engineering Co (MEC) for Q2 2025, worth a combined $203M — up 21% from $168M a quarter earlier.

Sellers outnumbered buyers: 18 funds closed out of MEC and 14 opened new positions — a net loss of 4 holders — while 31 trimmed existing stakes and 47 added.

The largest buyer was William Blair & Company, adding an estimated $4.02M. The largest seller was Nokomis Capital, exiting entirely with an estimated $4.66M sold.

  • 112 institutional investors held Mayville Engineering Co (MEC) as of Q2 2025, down from 116 in Q1 2025.
  • Funds reported $203M of Mayville Engineering Co stock for Q2 2025, up 21% quarter-over-quarter.
  • 14 funds opened new Mayville Engineering Co positions in Q2 2025 and 18 closed out, a net change of -4 holders.
  • The largest Mayville Engineering Co buyer in Q2 2025 was William Blair & Company, an estimated $4.02M added.
  • The largest Mayville Engineering Co seller in Q2 2025 was Nokomis Capital, an estimated $4.66M sold.

Based on aggregated 13F filings for Q2 2025.