MESA LABORATORIES INC /CO (MLAB) is a publicly traded company in the Unknown sector. Across all available filings, 24 corporate insiders have executed 803 transactions totaling $86.3M, demonstrating a bearish sentiment with -$76.2M in net insider flow. The most recent transaction on Dec 2, 2025 involved a transaction of 2,000 shares valued at $0.
No significant insider buying has been recorded for MLAB in the recent period.
No significant insider selling has been recorded for MLAB in the recent period.
Based on recent SEC filings, insider sentiment for MLAB is bearish with an Insider Alignment Score of 6/100 and a net flow of -$76.2M. Insiders are reducing their positions, though this can be driven by factors unrelated to company outlook.
Insider trading at MESA LABORATORIES INC /CO (MLAB) refers to stock transactions made by corporate insiders—executives, directors, and beneficial owners holding more than 10% of the company's shares. These individuals have access to material non-public information and are required by law to report their trades to the SEC within two business days. Currently, 24 insiders are actively trading MLAB stock, having executed 803 transactions in the past 90 days. The most active insider is John James Sullivan (Executive), who has made 133 transactions totaling $30.9M.
Get notified when executives and directors at MLAB file new Form 4 transactions
Date | Insider | Title | Type | Shares | Price | Value | Flags |
|---|---|---|---|---|---|---|---|
| Dec 2, 2025 | James Sullivan John | Executive | Gift | 2,000 | $N/A | $0 | |
| Oct 27, 2025 | M. Owens Gary | Executive | Option Exercise | 11,558 | $N/A | $0 | |
| Aug 15, 2025 | Sadie Alltoft Jennifer | Executive | Option Exercise | 1,404 | $N/A | $0 | |
| Aug 15, 2025 | Christopher Capone Mark | Executive | Option Exercise | 1,404 | $N/A | $0 | |
| Aug 15, 2025 | Tony Tripeny R. | Executive | Option Exercise | 1,404 | $N/A | $0 | |
| Aug 15, 2025 | Hall Shannon | Executive | Option Exercise | 1,404 | $N/A | $0 | |
| Aug 15, 2025 | James Sullivan John | Executive | Option Exercise | 1,404 | $N/A | $0 | |
| Aug 15, 2025 | Shabanali Ladiwala Shiraz | Executive | Option Exercise | 1,949 | $N/A | $0 | |
| Sep 13, 2024 | David Archbold Brian | Executive | Sale | 1,499 | $125.00 | $187.4K | 10b5-1 |
| Sep 1, 2024 | Sadie Alltoft Jennifer | Executive | Option Exercise | 1,074 | $N/A | $0 | |
| Sep 1, 2024 | Hall Shannon | Executive | Option Exercise | 1,074 | $N/A | $0 | |
| Sep 1, 2024 | Shabanali Ladiwala Shiraz | Executive | Option Exercise | 1,574 | $N/A | $0 | |
| Sep 1, 2024 | Tony Tripeny R. | Executive | Option Exercise | 1,074 | $N/A | $0 | |
| Sep 1, 2024 | James Sullivan John | Executive | Option Exercise | 1,074 | $N/A | $0 | |
| Sep 1, 2024 | David Archbold Brian | Executive | Payment | 386 | $133.69 | $51.6K |
| TYPE | COUNT | VALUE | % |
|---|---|---|---|
Sale(S) | 235 | $81.2M | 71.6% |
Exercise(M) | 410 | $17.7M | 15.6% |
Other(J) | 5 | $5.2M | 4.6% |
Purchase(P) | 18 | $5.0M | 4.4% |
Payment(F) | 60 | $4.0M | 3.5% |
Exercise (Options)(X) | 2 | $163.8K | 0.1% |
Gift(G) | 46 | $80.0K | 0.1% |
Disposition(D) | 1 | $48.9K | 0.0% |
Award(A) | 25 | $0 | 0.0% |
Will Acquisition(W) | 1 | $0 | 0.0% |
Insider selling pressure at MESA LABORATORIES INC /CO has increased, with 24 insiders executing 803 transactions across all time. Total sales of $81.2M significantly outpace purchases of $5.0M, resulting in a net outflow of $76.2M. This selling activity appears largely discretionary, which may warrant closer attention from investors.