| $350M | ||
| $217M | ||
| $172M | ||
| $109M | ||
| $107M | ||
| $104M |
Buys | $1,354,488 | 5 | 42 |
Sells | $1,570,217 | 7 | 58 |
| Kadia Siddhartha | President and CEO | 1 | $800,090 | 0 | $0 | $800,090 |
| Ladiwala Shiraz Shabanali | director | 1 | $252,805 | 0 | $0 | $252,805 |
| Tripeny R Tony | director | 2 | $202,261 | 0 | $0 | $202,261 |
| Capone Mark Christopher | director | 1 | $99,331 | 0 | $0 | $99,331 |
| Crennen Lyndsey Elizabeth | CAO | 0 | $0 | 2 | $51,509 | $-51,509 |
| Archbold Brian David | SVP Operations | 0 | $0 | 2 | $341,745 | $-341,745 |
| Sakys John | CFO | 0 | $0 | 2 | $376,872 | $-376,872 |
| Sullivan John James | director | 0 | $0 | 1 | $800,090 | $-800,090 |
Mesa Laboratories, Inc. develops, designs, manufactures, sells, and services life sciences tools and quality control products and services in North America, Europe, the Asia Pacific, and internationally. The Sterilization and Disinfection Control segment offers biological, chemical, and cleaning indicators, used to assess the effectiveness of sterilization decontamination, disinfection, and cleaning processes in the pharmaceutical, medical device, and healthcare industries. This segment also provides testing and laboratory services to the …
Over the last 12 months, insiders at Mesa Laboratories, Inc. have bought $1.35M and sold $1.57M worth of Mesa Laboratories, Inc. stock.
On average, over the past 5 years, insiders at Mesa Laboratories, Inc. have bought $727,244 and sold $3.48M worth of stock each year.
Highest buying activity among insiders over the last 12 months: Kadia Siddhartha (President and CEO) — $800,090. Ladiwala Shiraz Shabanali (director) — $252,805. Tripeny R Tony (director) — $202,261.
The last purchase of 900 shares for transaction amount of $102,321 was made by Tripeny R Tony (director) on 2026‑08‑13.
| 2026-08-13 | Sale | Sullivan John James | director | 7,093 0.1249% | $112.80 | $800,090 | +12.98% | |
| 2026-08-13 | Kadia Siddhartha | President and CEO | 7,093 0.1249% | $112.80 | $800,090 | +12.98% | ||
| 2026-08-13 | Tripeny R Tony | director | 900 0.016% | $113.69 | $102,321 | +12.98% | ||
| 2026-06-22 | Sale | Sakys John | CFO | 2,827 0.0491% | $89.50 | $253,022 | +31.99% | |
| 2026-06-22 | Sale | Archbold Brian David | SVP Operations | 2,516 0.0437% | $89.50 | $225,187 | +31.99% | |
| 2026-06-22 | Sale | Crennen Lyndsey Elizabeth | CAO | 442 0.0077% | $89.50 | $39,560 | +31.99% | |
| 2026-06-16 | Sale | Sakys John | CFO | 1,223 0.0225% | $101.27 | $123,850 | +22.51% | |
| 2026-06-16 | Sale | Archbold Brian David | SVP Operations | 1,151 0.0212% | $101.27 | $116,558 | +22.51% | |
| 2026-06-16 | Sale | Crennen Lyndsey Elizabeth | CAO | 118 0.0022% | $101.27 | $11,950 | +22.51% | |
| 2026-03-10 | Ladiwala Shiraz Shabanali | director | 3,500 0.0522% | $72.23 | $252,805 | +41.82% | ||
| 2026-03-10 | Tripeny R Tony | director | 1,315 0.0206% | $76.00 | $99,940 | +41.82% | ||
| 2026-03-10 | Capone Mark Christopher | director | 1,301 0.0205% | $76.35 | $99,331 | +41.82% | ||
| 2025-06-16 | Sale | Owens Gary M | President and CEO | 1,939 0.0359% | $97.12 | $188,312 | -15.62% | |
| 2025-06-16 | Sale | Sakys John | CFO | 642 0.0119% | $97.12 | $62,350 | -15.62% | |
| 2025-06-16 | Sale | Archbold Brian David | SVP Operations | 472 0.0087% | $97.12 | $45,840 | -15.62% | |
| 2025-03-19 | Sale | Owens Gary M | President and CEO | 21,000 0.3855% | $123.91 | $2.6M | -34.41% | |
| 2024-10-29 | Sale | Owens Gary M | President and CEO | 2,551 0.0469% | $111.98 | $285,651 | -0.36% | |
| 2024-10-28 | Sale | Owens Gary M | President and CEO | 2,518 0.0395% | $113.62 | $286,085 | -0.49% | |
| 2024-09-13 | Sale | Archbold Brian David | SVP Operations | 1,499 0.0276% | $125.00 | $187,375 | -5.47% | |
| 2023-12-15 | Sale | Archbold Brian David | SVP Operations | 1,500 0.0282% | $112.36 | $168,540 | -1.60% |
| Sullivan John James | director | 17834 0.3187% | $2.24M | 5 | 36 | |
| Ladiwala Shiraz Shabanali | director | 8523 0.1523% | $1.07M | 1 | 0 | |
| Kadia Siddhartha | President and CEO | 7093 0.1268% | $890,029.64 | 1 | 0 | |
| Tripeny R Tony | director | 6298 0.1125% | $790,273.04 | 3 | 0 | <0.0001% |
| Capone Mark Christopher | director | 3429 0.0613% | $430,270.92 | 1 | 0 | |
| SEG Ventures, LLC | director | 200000 3.5741% | $25.1M | 4 | 0 | |
| CAMPBELL H STUART | director | 41527 0.7421% | $5.21M | 1 | 22 | <0.0001% |
| Dwyer Robert V | director | 35696 0.6379% | $4.48M | 2 | 26 | |
| GUILLEMIN EVAN | 28776 0.5142% | $3.61M | 4 | 19 | ||
| Adriance Glenn E | CSMO | 10000 0.1787% | $1.25M | 1 | 9 | +36.19% |
| KELLY DAVID M | director | 2600 0.0465% | $326,248.00 | 3 | 14 | +33.15% |
| Increased Positions | 93 | +63.7% | 1M | +23.38% |
| Decreased Positions | 61 | -41.78% | 1M | -26.88% |
| New Positions | 39 | New | 571,714 | New |
| Sold Out Positions | 14 | Sold Out | 827,451 | Sold Out |
| Total Postitions | 178 | +21.92% | 5M | -3.5% |
| Conestoga Capital Advisors, Llc | $33,873.00 | 7.11% | 426,457 | -139,693 | -24.67% | 2025-09-30 |
| Blackrock, Inc. | $30,882.00 | 6.48% | 388,795 | -402,332 | -50.86% | 2025-09-30 |
| Vanguard Group Inc | $25,554.00 | 5.36% | 321,717 | -67,692 | -17.38% | 2025-09-30 |
| Morgan Stanley | $20,253.00 | 4.25% | 254,974 | +36,178 | +16.54% | 2025-09-30 |
| Ranger Investment Management, L.P. | $16,656.00 | 3.5% | 209,700 | -4,590 | -2.14% | 2025-09-30 |
| Geneva Capital Management Llc | $15,202.00 | 3.19% | 191,386 | -7,706 | -3.87% | 2025-09-30 |
| Simcoe Capital Management, Llc | $15,165.00 | 3.18% | 190,929 | +190,929 | New | 2025-09-30 |
| Royce & Associates Lp | $11,800.00 | 2.48% | 148,558 | -99,048 | -40% | 2025-09-30 |
| Glenmede Trust Co Na | $11,640.00 | 2.44% | 146,544 | -5,303 | -3.49% | 2025-03-31 |
| Janus Henderson Group Plc | $11,569.00 | 2.43% | 145,654 | +32,369 | +28.57% | 2025-09-30 |