Mesa Laboratories, Inc. (MLAB) Insider Trading
Over the last 3 months, MLAB insiders made 2 open-market buys and 7 sales, a net sale of -$668K (SEC Form 4). Multiple insiders bought within days of each other (cluster buying). Over the last 6 months, 133 institutions increased and 84 reduced their position (13F).
Insider Activity
Sentiment
40/100
Buys (3m)
2
Sells (3m)
7
Net (3m)
-$667.8K
Insiders buyingCluster buying
Insider trades by month Buys Sells
Oct
Mar
Jun
Mar
Jun
Aug
Context3-month price +18.9%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 17, 2026 | Kadia Siddharthaofficer: President and CEO | Buy | 7,093 | $112.80 |
| Aug 17, 2026 | Sullivan John Jamesdirector | Option | 2,784 | — |
| Aug 17, 2026 | Hall Shannondirector | Option | 2,784 | — |
| Aug 17, 2026 | Alltoft Jennifer Sadiedirector | Option | 2,784 | — |
| Aug 17, 2026 | Tripeny R Tonydirector | Buy | 900 | $113.69 |
| Aug 17, 2026 | Sullivan John Jamesdirector | Sell | 7,093 | $112.80 |
| Aug 17, 2026 | Tripeny R Tonydirector | Option | 2,784 | — |
| Aug 17, 2026 | Capone Mark Christopherdirector | Option | 2,784 | — |
| Aug 17, 2026 | Ladiwala Shiraz Shabanalidirector | Option | 3,810 | — |
| Jun 23, 2026 | Sakys Johnofficer: CFO | Grant | 2,282 | $95.10 |
| Jun 23, 2026 | Sakys Johnofficer: CFO | Option | 2,756 | $95.10 |
| Jun 23, 2026 | Crennen Lyndsey Elizabethofficer: CAO | Option | 233 | $95.10 |
| Jun 23, 2026 | Archbold Brian Davidofficer: SVP Operations | Sell | 2,516 | $89.50 |
| Jun 23, 2026 | Archbold Brian Davidofficer: SVP Operations | Option | 844 | $95.10 |
| Jun 23, 2026 | Crennen Lyndsey Elizabethofficer: CAO | Option | 125 | $95.10 |
| Jun 23, 2026 | Crennen Lyndsey Elizabethofficer: CAO | Sell | 442 | $89.50 |
| Jun 23, 2026 | Sakys Johnofficer: CFO | Sell | 2,827 | $89.50 |
| Jun 23, 2026 | Sakys Johnofficer: CFO | Option | 1,036 | $95.10 |
| Jun 23, 2026 | Crennen Lyndsey Elizabethofficer: CAO | Option | 368 | $95.10 |
| Jun 23, 2026 | Crennen Lyndsey Elizabethofficer: CAO | Grant | 263 | $95.10 |
| Jun 23, 2026 | Archbold Brian Davidofficer: SVP Operations | Grant | 1,859 | $95.10 |
| Jun 23, 2026 | Archbold Brian Davidofficer: SVP Operations | Option | 2,480 | $95.10 |
| Jun 17, 2026 | Archbold Brian Davidofficer: SVP Operations | Sell | 1,151 | $101.27 |
| Jun 17, 2026 | Sakys Johnofficer: CFO | Sell | 1,223 | $101.27 |
| Jun 17, 2026 | Crennen Lyndsey Elizabethofficer: CAO | Sell | 118 | $101.27 |
| Jun 16, 2026 | Archbold Brian Davidofficer: SVP Operations | Grant | 4,328 | — |
| Jun 16, 2026 | Archbold Brian Davidofficer: SVP Operations | Option | 2,454 | $104.08 |
| Jun 16, 2026 | Sakys Johnofficer: CFO | Grant | 8,416 | — |
| Jun 16, 2026 | Sakys Johnofficer: CFO | Option | 2,717 | $104.08 |
| May 19, 2026 | Kadia Siddharthaofficer: President and CEO | Grant | 35,236 | — |
Source: MLAB SEC Form 4 filings, latest Aug 17, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their MLAB positions over the last 6 months (SEC Form 13F).
Increased
133
New positions
46
Reduced
84
Sold out
18
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| Long Path Partners LP | Increased | 477K | Jul 31, 2026 |
| BlackRock, Inc. | Increased | 441K | Aug 7, 2026 |
| LONG PATH PARTNERS LP | Increased | 406K | May 14, 2026 |
| BLACKROCK, INC. | Reduced | 394K | May 13, 2026 |
| BOSTON PARTNERS | Increased | 269K | May 11, 2026 |
| Boston Partners | Reduced | 265K | Aug 4, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 237K | Aug 13, 2026 |
| SELECT EQUITY GROUP, L.P. | Increased | 236K | May 15, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 233K | May 15, 2026 |
| AQR CAPITAL MANAGEMENT LLC | Increased | 204K | Aug 14, 2026 |
| RANGER INVESTMENT MANAGEMENT, L.P. | Reduced | 203K | May 15, 2026 |
| Ranger Investment Management, L.P. | Reduced | 174K | Aug 13, 2026 |
| AQR CAPITAL MANAGEMENT LLC | Increased | 171K | May 15, 2026 |
| MORGAN STANLEY | Reduced | 162K | May 15, 2026 |
| ROYCE & ASSOCIATES LP | Increased | 161K | May 12, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.