MLAB
Mesa Laboratories, Inc. · Healthcare · Medical - Specialties
Momentum inputs (comparable managers):
holder breadth +30.0% ·
share flow +10.6% ·
net new positions +20.0%
— formula
Broad accumulation — rising shares across more holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q2 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q2 2026 | 67 | 0 | 2.99M | $297.50M | +4 | −4 |
| Q1 2026 | 70 | 0 | 2.66M | $235.21M | +6 | −6 |
| Q4 2025 | 70 | +2 | 2.73M | $214.06M | +2 | — |
| Q3 2025 | 17 | +1 | 1.54M | $103.48M | +2 | −1 |
| Q2 2025 | 13 | +4 | 1.73M | $163.31M | +4 | — |
| Q1 2025 | 6 | -3 | 383.09K | $45.46M | — | −3 |
| Q4 2024 | 9 | +1 | 400.64K | $52.84M | +1 | — |
| Q3 2024 | 7 | 0 | 174.94K | $22.72M | +1 | −1 |
| Q2 2024 | 7 | — | 189.52K | $16.45M | — | — |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 2 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 3 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 4 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 5 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 6 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 7 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 8 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 9 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 10 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 11 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 12 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 13 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 14 | BlackRock ✦ (passive) | 791.13K | — | $74.54M | 0.0% | n/c | 1 | SEC ↗ |
| 15 | The Vanguard Group ✦ (passive) | 389.41K | — | $36.69M | 0.0% | n/c | 1 | SEC ↗ |
| 16 | The Vanguard Group ✦ (passive) | 389.41K | — | $36.69M | 0.0% | n/c | 1 | SEC ↗ |
| 17 | The Vanguard Group ✦ (passive) | 389.41K | — | $36.69M | 0.0% | n/c | 1 | SEC ↗ |
| 18 | The Vanguard Group ✦ (passive) | 389.41K | — | $36.69M | 0.0% | n/c | 1 | SEC ↗ |
| 19 | The Vanguard Group ✦ (passive) | 389.41K | — | $36.69M | 0.0% | n/c | 1 | SEC ↗ |
| 20 | State Street Global Advisors ✦ (passive) | 211.84K | -3.5% | $19.96M | 0.0% | ▼ Trim | 3 | SEC ↗ |
| 21 | Geode Capital Management ✦ (passive) | 138.77K | +0.9% | $13.08M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 22 | Geode Capital Management ✦ (passive) | 138.77K | +0.9% | $13.08M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 23 | Renaissance Technologies ✦ | 68.03K | +729.6% | $6.41M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 24 | Millennium Management ✦ | 57.71K | New | $5.44M | 0.0% | New | 1 | SEC ↗ |
| 25 | Citadel Advisors ✦ | 26.87K | +341.8% | $2.53M | 0.0% | ▲ Add | 5 | SEC ↗ |
| 26 | Wellington Management ✦ | 22.47K | New | $2.12M | 0.0% | New | 1 | SEC ↗ |
| 27 | Wellington Management ✦ | 22.47K | New | $2.12M | 0.0% | New | 1 | SEC ↗ |
| 28 | D. E. Shaw & Co. ✦ | 8.66K | New | $816,416 | 0.0% | New | 1 | SEC ↗ |
| 29 | AQR Capital Management ✦ | 7.73K | -5.3% | $728,038 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 30 | AQR Capital Management ✦ | 7.73K | -5.3% | $728,038 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 31 | AQR Capital Management ✦ | 7.73K | -5.3% | $728,038 | 0.0% | ▼ Trim | 5 | SEC ↗ |
| 32 | GAMCO Investors ✦ | 3.93K | New | $370,285 | 0.0% | New | 1 | SEC ↗ |
| 33 | T. Rowe Price ✦ | 3.83K | +6.7% | $361,000 | 0.0% | ▲ Add | 5 | SEC ↗ |
| 34 | Fidelity (FMR) ✦ | 2.92K | — | $275,374 | 0.0% | n/c | 1 | SEC ↗ |
| 35 | Fidelity (FMR) ✦ | 2.92K | — | $275,374 | 0.0% | n/c | 1 | SEC ↗ |
“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.
New buyers
| Millennium Management | $5.44M | 0.0% |
| Wellington Management | $2.12M | 0.0% |
| Wellington Management | $2.12M | 0.0% |
| D. E. Shaw & Co. | $816,416 | 0.0% |
| GAMCO Investors | $370,285 | 0.0% |
Exited
| No tracked exits this quarter. |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 158 holders, 4.82M shares, $424.86M reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
Officer · President and CEO · 7.09K sh @ 112.80 · $800,090
Director · 900 sh @ 113.69 · $102,321
Open-market sales (S)
Director · 7.09K sh · $800,090
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology