MLAB · Insider trading · 13F holders · Congress trades
Mesa Laboratories Inc (MLAB)
Who is buying and selling MLAB: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 5
- Insider buys, 90 days
- $902K
- Insider sales, 90 days
- $800K
- Congress trades, 12 months
- 0
MLAB at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 3 MLAB insiders filed 2 open-market purchases worth $902K and 1 sale worth $800K on SEC Form 4.
- 5 13F filers hold MLAB among their 50 largest positions, worth $77.3M combined. The biggest bets by portfolio weight are Long Path Partners LP (20.2%), Meros Investment Management, LP (2.1%) and Monimus Capital Management, LP (1.4%). In their latest 13Fs, 1 manager opened a new position and 1 added to one.
- No member of Congress has disclosed a trade in MLAB.
- MLAB last closed at $133.03 on Oct 29, 2026.
MLAB insider trading
Between Aug 1, 2026 and Oct 29, 2026, 3 MLAB insiders filed 2 open-market purchases worth $902K and 1 sale worth $800K on SEC Form 4.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Aug 17, 2026 | Sullivan John James | Director | Sale | 7,093 | $112.80 | $800K | SEC |
| Aug 17, 2026 | Kadia Siddhartha | President and CEO | Buy | 7,093 | $112.80 | $800K | SEC |
| Aug 17, 2026 | Tripeny R Tony | Director | Buy | 900 | $113.69 | $102K | SEC |
Who owns MLAB? Hedge funds and superinvestors
5 13F filers hold MLAB among their 50 largest positions, worth $77.3M combined. The biggest bets by portfolio weight are Long Path Partners LP (20.2%), Meros Investment Management, LP (2.1%) and Monimus Capital Management, LP (1.4%). In their latest 13Fs, 1 manager opened a new position and 1 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Long Path Partners LPHedge fund | 20.2% | $47.5M | 477,126 | +17.6% shares | Q2 2026 |
| Ranger Investment Management, L.P.Institutional asset manager | 1.1% | $17.3M | 173,988 | -14.3% shares | Q2 2026 |
| Meros Investment Management, LPInstitutional asset manager | 2.1% | $6.8M | 67,962 | -0.1% shares | Q2 2026 |
| Monimus Capital Management, LPHedge fund | 1.4% | $5.5M | 55,344 | -45.4% shares | Q2 2026 |
| Topline Capital Management, LLCHedge fund | 0.1% | $236K | 2,374 | New | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 5). Screen MLAB in the grand portfolio →
MLAB stock trades by members of Congress
No member of Congress has disclosed a trade in MLAB.
MLAB questions and answers
Are insiders buying MLAB stock?
Between Aug 1, 2026 and Oct 29, 2026, 3 MLAB insiders filed 2 open-market purchases worth $902K and 1 sale worth $800K on SEC Form 4.
Which hedge funds own MLAB?
5 13F filers hold MLAB among their 50 largest positions, worth $77.3M combined. The biggest bets by portfolio weight are Long Path Partners LP (20.2%), Meros Investment Management, LP (2.1%) and Monimus Capital Management, LP (1.4%). In their latest 13Fs, 1 manager opened a new position and 1 added to one.
Has Congress traded MLAB?
No member of Congress has disclosed a trade in MLAB.
Who is the largest holder of MLAB?
Among 13F filers, Long Path Partners LP reports the largest MLAB position, $47.5M (477,126 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Long Path Partners LP's: 20.2% of its portfolio.
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