Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in MLAB held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Long Path Partners LP | 406K | $35.9M | +78.5% | 7.341% | 16.29% |
| 2 | BlackRock, Inc. | 394K | $34.8M | -1.2% | 7.129% | 0.00% |
| 3 | Boston Partners | 269K | $23.8M | +25.9% | 4.864% | 0.02% |
| 4 | Select Equity Group, L.P. | 236K | $20.9M | +14.3% | 4.269% | 0.11% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 233K | $20.6M | — | 4.211% | 0.00% |
| 6 | Ranger Investment Management, L.P. | 203K | $17.9M | -1.1% | 3.672% | 1.30% |
| 7 | AQR CAPITAL MANAGEMENT LLC | 171K | $15.1M | +143.2% | 3.087% | 0.01% |
| 8 | MORGAN STANLEY | 162K | $14.3M | -7.7% | 2.934% | 0.00% |
| 9 | ROYCE & ASSOCIATES LP | 161K | $14.3M | +5.1% | 2.918% | 0.14% |
| 10 | DIAMOND HILL CAPITAL MANAGEMENT INC | 155K | $13.7M | +9.4% | 2.811% | 0.09% |
| 11 | KENNEDY CAPITAL MANAGEMENT, INC. | 142K | $12.6M | -1.6% | 2.576% | 0.27% |
| 12 | Russell Investments Group, Ltd. | 135K | $11.9M | +16.1% | 2.445% | 0.01% |
| 13 | GEODE CAPITAL MANAGEMENT, LLC | 128K | $11.3M | +0.0% | 2.317% | 0.00% |
| 14 | DIMENSIONAL FUND ADVISORS LP | 125K | $11.0M | +7.1% | 2.256% | 0.00% |
| 15 | STATE STREET CORP | 122K | $10.8M | +1.2% | 2.209% | 0.00% |
| 16 | RAYMOND JAMES FINANCIAL INC | 123K | $10.7M | +22.4% | 2.225% | 0.00% |
| 17 | MONIMUS CAPITAL MANAGEMENT, LP | 101K | $9.0M | +148.0% | 1.833% | 2.48% |
| 18 | CRAWFORD INVESTMENT COUNSEL INC | 96K | $8.4M | +17.6% | 1.729% | 0.14% |
| 19 | Roubaix Capital, LLC | 72K | $6.4M | +30.7% | 1.305% | 2.98% |
| 20 | GOLDMAN SACHS GROUP INC | 71K | $6.2M | +27.8% | 1.278% | 0.00% |
| 21 | JANUS HENDERSON GROUP PLC | 69K | $6.1M | -40.5% | 1.256% | 0.00% |
| 22 | NORTHERN TRUST CORP | 69K | $6.1M | +5.5% | 1.254% | 0.00% |
| 23 | Meros Investment Management, LP | 68K | $6.0M | -20.0% | 1.231% | 2.61% |
| 24 | GABELLI FUNDS LLC | 62K | $5.5M | +2.9% | 1.131% | 0.04% |
| 25 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 62K | $5.5M | +0.8% | 1.130% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in MLAB — a direct measure of their conviction.
Filings activity in MLAB during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 155 | 1.9% | 72.51% | +9.39 pp | $423M | +15% |
| Q4 2025 | 158 | +15% | 63.12% | +6.33 pp | $368M | +11% |
| Q3 2025 | 137 | 12% | 56.79% | 26.01 pp | $331M | 31% |
| Q2 2025 | 156 | +3.3% | 82.80% | 20.91 pp | $483M | 20% |
| Q1 2025 | 151 | 5.6% | 103.71% | 10.22 pp | $604M | 9.0% |
| Q4 2024 | 160 | 3.6% | 113.93% | +6.32 pp | $664M | +5.9% |
| Q3 2024 | 166 | +6.4% | 107.61% | +35.23 pp | $627M | +49% |
| Q2 2024 | 156 | — | 72.38% | — | $422M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying MLAB stock.
Based on Q1 2026 13F filings, institutional ownership of Mesa Laboratories, Inc. stands at 72.5%, held across 155 reporting institutions.
Long Path Partners LP is the largest reported institutional holder of MLAB, with approximately 405,583 shares worth $0.04B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of MLAB.
Our composite Smart Money Score for MLAB is 42 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
24 institutions opened new positions in MLAB during Q1 2026, while 27 fully exited. 102 added to existing positions and 29 trimmed.
MLAB institutional ownership rose by 9.39 percentage points quarter-over-quarter, with a net change of -3 holders.
The top 10 institutions account for 50.0% of all reported 13F value in MLAB, and the top 25 account for 80.2%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Mesa Laboratories, Inc. (MLAB) Institutional Ownership