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Mesa Laboratories
MLAB

151 hedge funds and large institutions have $613M invested in Mesa Laboratories in 2025 Q1 according to their latest regulatory filings, with 17 funds opening new positions, 56 increasing their positions, 52 reducing their positions, and 20 closing their positions.

New
Increased
Maintained
Reduced
Closed

1.2% more ownership

Funds ownership: 93.99% → 95.19% (+1.2%)

8% more repeat investments, than reductions

Existing positions increased: 56 | Existing positions reduced: 52

3% less funds holding

Funds holding: 156 → 151 (-5)

9% less capital invested

Capital invested by funds: $673M → $613M (-$59.6M)

15% less first-time investments, than exits

New positions opened: 17 | Existing positions closed: 20

Holders
151
Holders Change
-5
Holders Change %
-3.21%
% of All Funds
2.02%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
17
Increased
56
Reduced
52
Closed
20
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
Select Equity Group
Select Equity Group
New York
+$8.2M
2
KCM
Kennedy Capital Management
Missouri
+$5.27M
3
BP
BBR Partners
New York
+$3.76M
4
CIC
Crawford Investment Counsel
Georgia
+$3.57M
5
Russell Investments Group
Russell Investments Group
United Kingdom
+$2.59M

Top Sellers

Rank Fund Capital Flow
1
Jane Street
Jane Street
New York
-$3.73M
2
Morgan Stanley
Morgan Stanley
New York
-$3.3M
3
BlackRock
BlackRock
New York
-$2.28M
4
RA
Royce & Associates
New York
-$2.19M
5
Goldman Sachs
Goldman Sachs
New York
-$1.99M
Name Holding Trade Value Shares
Change 		Change in
Stake
Wells Fargo
26
Wells Fargo
California
$3.56M +$97.6K +716 +2%
Diamond Hill Capital Management
27
Diamond Hill Capital Management
Ohio
$3.5M +$385K +2,824 +11%
BP
28
BBR Partners
New York
$3.27M +$3.76M +27,595 New
UBS Group
29
UBS Group
Switzerland
$3.25M +$1.04M +7,635 +39%
RHJA
30
Rice Hall James & Associates
California
$3.25M -$39.9K -293 -1%
CIC
31
Crawford Investment Counsel
Georgia
$3.11M +$3.57M +26,200 New
SBH
32
Segall Bryant & Hamill
Illinois
$2.37M -$60.9K -447 -2%
UBS AM
33
UBS AM
Illinois
$2.37M +$93.4K +685 +4%
Luther King Capital Management (LKCM)
34
Luther King Capital Management (LKCM)
Texas
$2.36M – – –
N
35
Nuveen
North Carolina
$2.3M +$861K +6,318 +48%
Envestnet Asset Management
36
Envestnet Asset Management
Illinois
$2.26M +$199K +1,463 +8%
Invesco
37
Invesco
Georgia
$2.13M -$78.8K -578 -3%
Public Sector Pension Investment Board (PSP Investments)
38
Public Sector Pension Investment Board (PSP Investments)
Quebec, Canada
$2.05M +$501K +3,679 +27%
KTA
39
Keeley-Teton Advisors
Illinois
$1.86M -$861K -6,319 -29%
Goldman Sachs
40
Goldman Sachs
New York
$1.82M -$1.99M -14,601 -49%
Legal & General Group
41
Legal & General Group
United Kingdom
$1.65M -$51.3K -376 -3%
Ohio Public Employees Retirement System (OPERS)
42
Ohio Public Employees Retirement System (OPERS)
Ohio
$1.63M -$429K -3,149 -19%
RhumbLine Advisers
43
RhumbLine Advisers
Massachusetts
$1.62M +$77.7K +570 +4%
American Century Companies
44
American Century Companies
Missouri
$1.57M +$517K +3,793 +40%
HIM
45
Herald Investment Management
United Kingdom
$1.48M +$693K +5,083 +69%
Lazard Asset Management
46
Lazard Asset Management
New York
$1.35M -$140K -1,029 -8%
Swiss National Bank
47
Swiss National Bank
Switzerland
$1.26M – – –
Citigroup
48
Citigroup
New York
$1.05M +$140K +1,028 +13%
Victory Capital Management
49
Victory Capital Management
Texas
$1.03M -$17.7K -130 -1%
Renaissance Technologies
50
Renaissance Technologies
New York
$973K +$95.4K +700 +9%
1
2
3 4 5

MLAB Hedge Fund Activity: Q1 2025 in Review

151 of the 7,458 institutional investors tracked by Wall St. Rank reported a position in Mesa Laboratories (MLAB) for Q1 2025, worth a combined $613M — down 8.9% from $673M a quarter earlier.

Sellers outnumbered buyers: 20 funds closed out of MLAB and 17 opened new positions — a net loss of 3 holders — while 52 trimmed existing stakes and 56 added.

The largest buyer was Select Equity Group, adding an estimated $8.2M. The largest seller was Jane Street, cutting an estimated $3.73M.

  • 151 institutional investors held Mesa Laboratories (MLAB) as of Q1 2025, down from 156 in Q4 2024.
  • Funds reported $613M of Mesa Laboratories stock for Q1 2025, down 8.9% quarter-over-quarter.
  • 17 funds opened new Mesa Laboratories positions in Q1 2025 and 20 closed out, a net change of -3 holders.
  • The largest Mesa Laboratories buyer in Q1 2025 was Select Equity Group, an estimated $8.2M added.
  • The largest Mesa Laboratories seller in Q1 2025 was Jane Street, an estimated $3.73M sold.

Based on aggregated 13F filings for Q1 2025.