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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
Allspring Global Investments
1
Allspring Global Investments
North Carolina
$39.8M +$71.6K +5,013 +0.2%
BlackRock
2
BlackRock
New York
$14.6M +$909K +63,598 +7%
Vanguard Group
3
Vanguard Group
Pennsylvania
$14.1M +$3.8M +266,049 +43%
Dimensional Fund Advisors
4
Dimensional Fund Advisors
Texas
$13M +$592K +41,466 +5%
TAM
5
Tocqueville Asset Management
New York
$9.12M -$715K -50,017 -8%
RA
6
Royce & Associates
New York
$8.92M -$464K -32,470 -5%
GIM
7
Granahan Investment Management
Massachusetts
$7.95M +$290K +20,267 +4%
William Blair & Company
8
William Blair & Company
Illinois
$5.96M +$4.02M +281,198 +305%
AA
9
Ancora Advisors
Ohio
$5.74M +$717K +50,200 +16%
First Eagle Investment Management
10
First Eagle Investment Management
New York
$5.65M +$31.4K +2,200 +0.6%
Geode Capital Management
11
Geode Capital Management
Massachusetts
$5.08M +$394K +27,552 +9%
American Century Companies
12
American Century Companies
Missouri
$4.9M +$783K +54,843 +22%
Arrowstreet Capital
13
Arrowstreet Capital
Massachusetts
$4.29M +$31.9K +2,235 +0.8%
State Street
14
State Street
Massachusetts
$4.23M +$181K +12,681 +5%
JCP
15
JB Capital Partners
New York
$4M – – –
Bank of America
16
Bank of America
North Carolina
$3.63M -$179K -12,527 -5%
BCM
17
Bridgeway Capital Management
Texas
$3.55M +$140K +9,779 +5%
Russell Investments Group
18
Russell Investments Group
United Kingdom
$3.45M +$227K +15,867 +8%
2L
19
22NW LP
Washington
$2.48M +$2.22M +155,450 New
Renaissance Technologies
20
Renaissance Technologies
New York
$2.3M +$830K +58,100 +68%
Jacobs Levy Equity Management
21
Jacobs Levy Equity Management
New Jersey
$2.18M +$55.5K +3,885 +3%
Osaic Holdings
22
Osaic Holdings
Arizona
$2.1M -$190K -13,281 -9%
GC
23
Globeflex Capital
California
$1.86M – – –
EF
24
Empowered Funds
Pennsylvania
$1.72M +$140K +9,779 +10%
Northern Trust
25
Northern Trust
Illinois
$1.62M +$26.1K +1,829 +2%
1
2 3 4 5

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.