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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
Thrivent Financial for Lutherans
151
Thrivent Financial for Lutherans
Minnesota
– -$377K -3,996 Closed
Franklin Resources
152
Franklin Resources
California
– -$328K -3,476 Closed
IMRF
153
Illinois Municipal Retirement Fund
Illinois
– -$272K -2,884 Closed
P
154
&Partners
Tennessee
– -$251K -2,664 Closed
IIM
155
INTECH Investment Management
Florida
– -$244K -2,593 Closed
State Board of Administration of Florida Retirement System
156
State Board of Administration of Florida Retirement System
Florida
– -$242K -2,564 Closed
Los Angeles Capital Management
157
Los Angeles Capital Management
California
– -$236K -2,504 Closed
LSERS
158
Louisiana State Employees Retirement System
Louisiana
– -$236K -2,500 Closed
Cambridge Investment Research Advisors
159
Cambridge Investment Research Advisors
Iowa
– -$212K -2,252 Closed
VF
160
Virtu Financial
New York
– -$210K -2,226 Closed
MM
161
MQS Management
New York
– -$207K -2,194 Closed
TRSOTSOK
162
Teachers Retirement System of the State of Kentucky
Kentucky
– -$152K -1,613 Closed
Pacer Advisors
163
Pacer Advisors
Pennsylvania
– -$128K -1,354 Closed
OPERF
164
Oregon Public Employees Retirement Fund
Oregon
– -$120K -1,278 Closed
New York State Teachers Retirement System (NYSTRS)
165
New York State Teachers Retirement System (NYSTRS)
New York
– -$109K -1,159 Closed
KK
166
KLP Kapitalforvaltning
Norway
– -$94.2K -1,000 Closed
Bank of Montreal
167
Bank of Montreal
Ontario, Canada
– -$84.8K -900 Closed
Zurich Cantonal Bank
168
Zurich Cantonal Bank
Switzerland
– -$13.9K -148 Closed
BIG
169
Brooklyn Investment Group
New York
– -$9.05K -96 Closed
AGWCA
170
Annis Gardner Whiting Capital Advisors
Florida
– -$8.86K -94 Closed
BNP Paribas Asset Management
171
BNP Paribas Asset Management
France
– -$6K -62 Closed
MPWT
172
MassMutual Private Wealth & Trust
Connecticut
– -$4.33K -46 Closed
CIAM
173
Caitong International Asset Management
Hong Kong
– -$2.92K -31 Closed
UB
174
UMB Bank
Missouri
– -$942 -10 Closed
BCMLT
175
Beacon Capital Management LLC (Tennessee)
Tennessee
– -$568 -6 Closed
4 5 6
7
8

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.