We are live on ! Find out more
MLAB icon

Mesa Laboratories
MLAB

141 hedge funds and large institutions have $334M invested in Mesa Laboratories in 2025 Q3 according to their latest regulatory filings, with 27 funds opening new positions, 40 increasing their positions, 54 reducing their positions, and 39 closing their positions.

New
Increased
Maintained
Reduced
Closed

4.55% less ownership

Funds ownership: 95.15% → 90.61% (-4.5%)

8% less funds holding

Funds holding: 154 → 141 (-13)

26% less repeat investments, than reductions

Existing positions increased: 40 | Existing positions reduced: 54

31% less first-time investments, than exits

New positions opened: 27 | Existing positions closed: 39

32% less capital invested

Capital invested by funds: $489M → $334M (-$155M)

Holders
141
Holders Change
-13
Holders Change %
-8.44%
% of All Funds
1.85%
Holding in Top 10
2
Holding in Top 10 Change
+2
Holding in Top 10 Change %
% of All Funds
0.03%
New
27
Increased
40
Reduced
54
Closed
39
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
SCM
Simcoe Capital Management
New York
+$13.7M
2
KLP
Kent Lake PR
Puerto Rico
+$9.68M
3
Boston Partners
Boston Partners
Massachusetts
+$7.84M
4
Diamond Hill Capital Management
Diamond Hill Capital Management
Ohio
+$6.09M
5
RC
Roubaix Capital
Colorado
+$5.52M

Top Sellers

Rank Fund Capital Flow
1
BlackRock
BlackRock
New York
-$29M
2
CCA
Conestoga Capital Advisors
Pennsylvania
-$10.1M
3
GIM
Glenmede Investment Management
Pennsylvania
-$10M
4
Raymond James Financial
Raymond James Financial
Florida
-$9.94M
5
RA
Royce & Associates
New York
-$7.13M
Name Holding Trade Value Shares
Change 		Change in
Stake
GF
26
Gabelli Funds
New York
$3.62M +$2.07M +28,818 +115%
HIM
27
Herald Investment Management
United Kingdom
$3.34M +$2.7M +37,500 +300%
Raymond James Financial
28
Raymond James Financial
Florida
$3.18M -$9.94M -138,153 -74%
Bank of America
29
Bank of America
North Carolina
$3.16M -$1.28M -17,829 -27%
Comerica Bank
30
Comerica Bank
Texas
$2.84M -$135K -1,875 -4%
Goldman Sachs
31
Goldman Sachs
New York
$2.8M +$889K +12,355 +42%
Ameriprise
32
Ameriprise
Minnesota
$2.62M -$2.48M -34,418 -47%
Jane Street
33
Jane Street
New York
$2.56M +$1.76M +24,442 +177%
CSS
34
Cubist Systematic Strategies
Connecticut
$2.41M +$2.59M +35,988 New
Citadel Advisors
35
Citadel Advisors
Florida
$2.29M +$526K +7,305 +27%
MCM
36
Monimus Capital Management
New Jersey
$2.26M +$2.43M +33,744 New
Bank of New York Mellon
37
Bank of New York Mellon
New York
$2.26M -$1.43M -19,814 -37%
D.E. Shaw & Co
38
D.E. Shaw & Co
New York
$2.2M +$1.74M +24,146 +279%
AQR Capital Management
39
AQR Capital Management
Connecticut
$2.19M +$1.79M +24,912 +322%
Qube Research & Technologies (QRT)
40
Qube Research & Technologies (QRT)
United Kingdom
$2.06M +$779K +10,827 +54%
Royal Bank of Canada
41
Royal Bank of Canada
Ontario, Canada
$1.8M -$748K -10,396 -28%
BP
42
BBR Partners
New York
$1.69M – – –
TI
43
Trexquant Investment
Connecticut
$1.68M +$1.52M +21,070 +524%
Luther King Capital Management (LKCM)
44
Luther King Capital Management (LKCM)
Texas
$1.33M – – –
UBS Group
45
UBS Group
Switzerland
$1.28M -$873K -12,133 -39%
State of Wisconsin Investment Board
46
State of Wisconsin Investment Board
Wisconsin
$1.23M +$1.32M +18,406 New
SBH
47
Segall Bryant & Hamill
Illinois
$1.23M – – –
RHJA
48
Rice Hall James & Associates
California
$1.15M -$590K -8,201 -32%
Envestnet Asset Management
49
Envestnet Asset Management
Illinois
$1.12M -$274K -3,801 -19%
Marshall Wace
50
Marshall Wace
United Kingdom
$978K +$1.05M +14,600 New
1
2
3 4 5

MLAB Hedge Fund Activity: Q3 2025 in Review

141 of the 7,621 institutional investors tracked by Wall St. Rank reported a position in Mesa Laboratories (MLAB) for Q3 2025, worth a combined $334M — down 32% from $489M a quarter earlier.

Sellers outnumbered buyers: 39 funds closed out of MLAB and 27 opened new positions — a net loss of 12 holders — while 54 trimmed existing stakes and 40 added.

The largest buyer was Simcoe Capital Management, opening a new position worth an estimated $13.7M. The largest seller was BlackRock, cutting an estimated $29M.

  • 141 institutional investors held Mesa Laboratories (MLAB) as of Q3 2025, down from 154 in Q2 2025.
  • Funds reported $334M of Mesa Laboratories stock for Q3 2025, down 32% quarter-over-quarter.
  • 27 funds opened new Mesa Laboratories positions in Q3 2025 and 39 closed out, a net change of -12 holders.
  • The largest Mesa Laboratories buyer in Q3 2025 was Simcoe Capital Management, an estimated $13.7M added.
  • The largest Mesa Laboratories seller in Q3 2025 was BlackRock, an estimated $29M sold.

Based on aggregated 13F filings for Q3 2025.