Mesa Laboratories
MLAB
159 hedge funds and large institutions have $372M invested in Mesa Laboratories in 2025 Q4 according to their latest regulatory filings, with 35 funds opening new positions, 55 increasing their positions, 44 reducing their positions, and 12 closing their positions.
192% more first-time investments, than exits
New positions opened: 35 | Existing positions closed: 12
25% more repeat investments, than reductions
Existing positions increased: 55 | Existing positions reduced: 44
13% more funds holding
Funds holding: 141 → 159 (+18)
12% more capital invested
Capital invested by funds: $334M → $372M (+$38.5M)
0% more funds holding in top 10
Funds holding in top 10: 2 → 2 (0)
4.68% less ownership
Funds ownership: 90.61% → 85.92% (-4.7%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
LPP
Long Path Partners
Stamford,
Connecticut
|
+$17.3M |
| 2 |
Boston Partners
Boston,
Massachusetts
|
+$7.53M |
| 3 |
Select Equity Group
New York
|
+$6.06M |
| 4 |
Raymond James Financial
St Petersburg,
Florida
|
+$4.03M |
| 5 |
D.E. Shaw & Co
New York
|
+$3.33M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
CCA
Conestoga Capital Advisors
Wayne,
Pennsylvania
|
-$28.6M |
| 2 |
SCM
Simcoe Capital Management
New York
|
-$12.8M |
| 3 |
Millennium Management
New York
|
-$9.84M |
| 4 |
Morgan Stanley
New York
|
-$6.04M |
| 5 |
Comerica Bank
Dallas,
Texas
|
-$3.22M |
MLAB Hedge Fund Activity: Q4 2025 in Review
159 of the 8,267 institutional investors tracked by Wall St. Rank reported a position in Mesa Laboratories (MLAB) for Q4 2025, worth a combined $372M — up 12% from $334M a quarter earlier.
Buyers outnumbered sellers: 35 funds opened new MLAB positions and 12 closed out — a net gain of 23 holders — while 55 added to existing stakes and 44 trimmed.
The largest buyer was Long Path Partners, opening a new position worth an estimated $17.3M. The largest seller was Conestoga Capital Advisors, exiting entirely with an estimated $28.6M sold.
- 159 institutional investors held Mesa Laboratories (MLAB) as of Q4 2025, up from 141 in Q3 2025.
- Funds reported $372M of Mesa Laboratories stock for Q4 2025, up 12% quarter-over-quarter.
- 35 funds opened new Mesa Laboratories positions in Q4 2025 and 12 closed out, a net change of +23 holders.
- The largest Mesa Laboratories buyer in Q4 2025 was Long Path Partners, an estimated $17.3M added.
- The largest Mesa Laboratories seller in Q4 2025 was Conestoga Capital Advisors, an estimated $28.6M sold.
Based on aggregated 13F filings for Q4 2025.