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Mesa Laboratories
MLAB

154 hedge funds and large institutions have $489M invested in Mesa Laboratories in 2025 Q2 according to their latest regulatory filings, with 24 funds opening new positions, 48 increasing their positions, 54 reducing their positions, and 19 closing their positions.

New
Increased
Maintained
Reduced
Closed

26% more first-time investments, than exits

New positions opened: 24 | Existing positions closed: 19

2% more funds holding

Funds holding: 151 → 154 (+3)

0.04% less ownership

Funds ownership: 95.19% → 95.15% (-0.04%)

11% less repeat investments, than reductions

Existing positions increased: 48 | Existing positions reduced: 54

20% less capital invested

Capital invested by funds: $613M → $489M (-$124M)

Holders
154
Holders Change
+3
Holders Change %
+1.99%
% of All Funds
2.03%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
24
Increased
48
Reduced
54
Closed
19
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
Renaissance Technologies
Renaissance Technologies
New York
+$6.57M
2
Millennium Management
Millennium Management
New York
+$6.33M
3
Janus Henderson Group
Janus Henderson Group
United Kingdom
+$3.57M
4
Select Equity Group
Select Equity Group
New York
+$3.11M
5
CIC
Crawford Investment Counsel
Georgia
+$2.8M

Top Sellers

Rank Fund Capital Flow
1
Ameriprise
Ameriprise
Minnesota
-$10.2M
2
Raymond James Financial
Raymond James Financial
Florida
-$8.61M
3
BlackRock
BlackRock
New York
-$4M
4
RA
Royce & Associates
New York
-$2.58M
5
KCM
Kennedy Capital Management
Missouri
-$2.5M
Name Holding Trade Value Shares
Change 		Change in
Stake
Diamond Hill Capital Management
26
Diamond Hill Capital Management
Ohio
$3.66M +$1.03M +9,341 +32%
Royal Bank of Canada
27
Royal Bank of Canada
Ontario, Canada
$3.51M +$714K +6,506 +21%
MIM
28
Meros Investment Management
Texas
$3.45M +$511K +4,654 +15%
UBS Group
29
UBS Group
Switzerland
$2.95M +$429K +3,907 +14%
Principal Financial Group
30
Principal Financial Group
Iowa
$2.81M -$1.52M -13,881 -32%
Goldman Sachs
31
Goldman Sachs
New York
$2.77M +$1.55M +14,092 +92%
Citadel Advisors
32
Citadel Advisors
Florida
$2.53M +$2.28M +20,791 +342%
RHJA
33
Rice Hall James & Associates
California
$2.39M -$223K -2,029 -7%
BP
34
BBR Partners
New York
$2.37M -$263K -2,400 -9%
GF
35
Gabelli Funds
New York
$2.37M +$2.76M +25,156 New
Wellington Management Group
36
Wellington Management Group
Massachusetts
$2.12M +$2.47M +22,471 New
Envestnet Asset Management
37
Envestnet Asset Management
Illinois
$1.93M +$156K +1,425 +7%
Luther King Capital Management (LKCM)
38
Luther King Capital Management (LKCM)
Texas
$1.88M – – –
Qube Research & Technologies (QRT)
39
Qube Research & Technologies (QRT)
United Kingdom
$1.87M +$1.78M +16,190 +437%
Public Sector Pension Investment Board (PSP Investments)
40
Public Sector Pension Investment Board (PSP Investments)
Quebec, Canada
$1.75M +$140K +1,272 +7%
SBH
41
Segall Bryant & Hamill
Illinois
$1.72M -$189K -1,723 -9%
Wells Fargo
42
Wells Fargo
California
$1.71M -$1.3M -11,876 -40%
Invesco
43
Invesco
Georgia
$1.68M -$14.7K -134 -0.7%
UBS AM
44
UBS AM
Illinois
$1.64M -$282K -2,574 -13%
N
45
Nuveen
North Carolina
$1.5M -$384K -3,500 -18%
Legal & General Group
46
Legal & General Group
United Kingdom
$1.38M +$81.9K +746 +5%
Jane Street
47
Jane Street
New York
$1.3M +$743K +6,766 +96%
Ohio Public Employees Retirement System (OPERS)
48
Ohio Public Employees Retirement System (OPERS)
Ohio
$1.29M – – –
American Century Companies
49
American Century Companies
Missouri
$1.27M +$21.3K +194 +1%
RhumbLine Advisers
50
RhumbLine Advisers
Massachusetts
$1.21M -$91.6K -835 -6%
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MLAB Hedge Fund Activity: Q2 2025 in Review

154 of the 7,596 institutional investors tracked by Wall St. Rank reported a position in Mesa Laboratories (MLAB) for Q2 2025, worth a combined $489M — down 20% from $613M a quarter earlier.

Buyers outnumbered sellers: 24 funds opened new MLAB positions and 19 closed out — a net gain of 5 holders — while 48 added to existing stakes and 54 trimmed.

The largest buyer was Renaissance Technologies, adding an estimated $6.57M. The largest seller was Ameriprise, cutting an estimated $10.2M.

  • 154 institutional investors held Mesa Laboratories (MLAB) as of Q2 2025, up from 151 in Q1 2025.
  • Funds reported $489M of Mesa Laboratories stock for Q2 2025, down 20% quarter-over-quarter.
  • 24 funds opened new Mesa Laboratories positions in Q2 2025 and 19 closed out, a net change of +5 holders.
  • The largest Mesa Laboratories buyer in Q2 2025 was Renaissance Technologies, an estimated $6.57M added.
  • The largest Mesa Laboratories seller in Q2 2025 was Ameriprise, an estimated $10.2M sold.

Based on aggregated 13F filings for Q2 2025.