Ex-dividend in 2d · $0.16
Mesa Laboratories
Supplies sterilization, biopharma, calibration, and clinical-genomics tools for regulated health markets.
$126.67
After-hours close−2.40 (−1.86%)
At close$129.07(+0.33%)
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Breakdown13F · Form 4
Institutions 91.03%5.09M sharesInsiders 2.90%162.3K sharesOther 6.07%339.6K shares
Shares outstanding 5.60M · Float 4.90M · 87.6% free float
Institutions13F, as of Jun 30, 2026
160 holders · 5.09M shares · 22 new positions · 96 increased · 37 reduced · 23 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Long Path Partners LP | 477.1K | 8.53% | +71.5K | Jul 31, 2026 |
| BlackRock, Inc. | 440.6K | 7.87% | +46.7K | Aug 7, 2026 |
| Boston Partners | 265.1K | 4.74% | −3.6K | Aug 4, 2026 |
| Vanguard Capital Management LLC | 237.5K | 4.24% | +4.8K | Aug 13, 2026 |
| AQR Capital Management LLC | 203.7K | 3.64% | +33.2K | Aug 14, 2026 |
| Ranger Investment Management, L.P. | 174.0K | 3.11% | −28.9K | Aug 13, 2026 |
| Morgan Stanley | 157.0K | 2.81% | −5.1K | Aug 13, 2026 |
| Diamond Hill Capital Management Inc | 155.8K | 2.78% | +469 | Aug 6, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Conestoga Capital Advisors | 11.38% | 618.1K | 13G | Jan 10, 2025 ↗ |
| Long Path Smaller Companies Fund, LP | 7.30% | 405.6K | 13G | Apr 15, 2026 ↗ |
| BlackRock, Inc. | 6.90% | 378.9K | 13G | Oct 2, 2025 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Gary M. Owens | officer: President and CEO | 64.1K | 1.15% | Oct 28, 2025 |
| John James Sullivan | director | 20.6K | 0.37% | Aug 17, 2026 |
| John Sakys | officer: CFO | 19.8K | 0.35% | Jun 23, 2026 |
| Shiraz Shabanali Ladiwala | director | 12.3K | 0.22% | Aug 17, 2026 |
| R. Tony Tripeny | director | 9.1K | 0.16% | Aug 17, 2026 |
| Jennifer Sadie Alltoft | director | 7.7K | 0.14% | Aug 17, 2026 |
| Siddhartha Kadia | officer: President and CEO | 7.1K | 0.13% | Aug 17, 2026 |
| Shannon Hall | director | 7.0K | 0.12% | Aug 17, 2026 |
| Brian David Archbold | officer: SVP Operations | 6.4K | 0.11% | Jun 23, 2026 |
| Mark Christopher Capone | director | 6.2K | 0.11% | Aug 17, 2026 |
2 ten-percent owners hold 190.2K shares by Form 4, outside the officers-and-directors figure above · 11 people have not refiled in the last 18 months (315.6K shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 13, 2026 | John James Sullivandirector | Sale | 7,093 | $112.80 | 17,834 |
| Aug 13, 2026 | Siddhartha Kadiaofficer: President and CEO | Purchase | 7,093 | $112.80 | 7,093 |
| Aug 13, 2026 | R. Tony Tripenydirector | Purchase | 900 | $113.69 | 6,298 |
| Jun 22, 2026 | John Sakysofficer: CFO | Sale | 2,827 | $89.50 | 19,785 |
| Jun 22, 2026 | Brian David Archboldofficer: SVP Operations | Sale | 2,516 | $89.50 | 6,377 |
| Jun 22, 2026 | Lyndsey Elizabeth Crennenofficer: CAO | Sale | 442 | $89.50 | 2,020 |
| Jun 16, 2026 | John Sakysofficer: CFO | Sale | 1,223 | $101.27 | 16,538 |
| Jun 16, 2026 | Lyndsey Elizabeth Crennenofficer: CAO | Sale | 118 | $101.27 | 1,473 |
| Jun 16, 2026 | Brian David Archboldofficer: SVP Operations | Sale | 1,151 | $101.27 | 3,710 |
| Mar 10, 2026 | R. Tony Tripenydirector | Purchase | 1,315 | $76.00 | 5,398 |
CongressHouse and Senate disclosures
Not reported.