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.
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)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
SCM
Simcoe Capital Management
New York
|
+$13.7M |
| 2 |
KLP
Kent Lake PR
Anasco,
Puerto Rico
|
+$9.68M |
| 3 |
Boston Partners
Boston,
Massachusetts
|
+$7.84M |
| 4 |
Diamond Hill Capital Management
Columbus,
Ohio
|
+$6.09M |
| 5 |
RC
Roubaix Capital
Denver,
Colorado
|
+$5.52M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
-$29M |
| 2 |
CCA
Conestoga Capital Advisors
Wayne,
Pennsylvania
|
-$10.1M |
| 3 |
GIM
Glenmede Investment Management
Philadelphia,
Pennsylvania
|
-$10M |
| 4 |
Raymond James Financial
St Petersburg,
Florida
|
-$9.94M |
| 5 |
RA
Royce & Associates
New York
|
-$7.13M |
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.