John James Sullivan serves as Executive at MESA LABORATORIES INC /CO, where they oversee executive responsibilities. Since joining the company, John James Sullivan has executed 136 insider transactions totaling $23.5M, demonstrating a bearish approach to their equity position. Their most recent transaction on Dec 2, 2025 involved gifting 2,000 shares valued at $0.
John James Sullivan currently holds 25,282 shares of MESA LABORATORIES INC /CO (MLAB), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, John James Sullivan has been a net seller of MLAB stock. They have purchased $17.0K and sold $23.5M worth of shares.
John James Sullivan's most recent insider trade was on Dec 2, 2025, when they sold 2,000 shares at $0.00 per share.
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| $N/A |
| Discretionary |
| Sep 1, 2024 | MLAB | $0 | Option Exercise | 1,074 | $N/A | Discretionary |
| Nov 9, 2023 | MLAB | $0 | Gift | 2,000 | $N/A | Discretionary |
| Nov 9, 2023 | MLAB | $0 | Gift | 200 | $N/A | Discretionary |
| Nov 9, 2023 | MLAB | $0 | Gift | 200 | $N/A | Discretionary |
| Aug 15, 2023 | MLAB | $0 | Option Exercise | 754 | $N/A | Discretionary |
| Jun 16, 2023 | MLAB | $813 | Payment | 6 | $135.55 | Discretionary |
| Jun 16, 2023 | MLAB | $0 | Option Exercise | 15 | $N/A | Discretionary |
| Jun 15, 2023 | MLAB | $807 | Payment | 6 | $134.45 | Discretionary |
| Jun 15, 2023 | MLAB | $0 | Option Exercise | 15 | $N/A | Discretionary |
| Feb 2, 2023 | MLAB | $0 | Gift | 14,580 | $N/A | Discretionary |
| Feb 2, 2023 | MLAB | $0 | Gift | 14,580 | $N/A | Discretionary |
| Nov 28, 2022 | MLAB | $0 | Gift | 1,425 | $N/A | Discretionary |
| Sep 1, 2022 | MLAB | $0 | Option Exercise | 787 | $N/A | Discretionary |
| Jul 5, 2022 | MLAB | $252.3K | Option Exercise | 3,576 | $70.56 | Discretionary |
| Jul 5, 2022 | MLAB | $1.8M | Option Exercise | 15,000 | $122.66 | Discretionary |
| Jun 15, 2022 | MLAB | $0 | Option Exercise | 30 | $N/A | Discretionary |
| Jun 15, 2022 | MLAB | $2.6K | Payment | 14 | $185.70 | Discretionary |
| Jun 9, 2022 | MLAB | $70.6K | Option Exercise | 1,001 | $70.56 | Discretionary |
| Jun 9, 2022 | @PVCNT2F | $70.6K | Option Exercise | 1,001 | $70.56 | Discretionary |
| Jun 7, 2022 | MLAB | $366.3K | Option Exercise | 5,192 | $70.56 | Discretionary |
| Jun 7, 2022 | MLAB | $1.1M | Sale | 5,192 | $207.76 | Discretionary |
| Jun 7, 2022 | @PVCNT2F | $1.1M | Sale | 5,192 | $207.76 | Discretionary |
| Jun 7, 2022 | @PVCNT2F | $366.3K | Option Exercise | 5,192 | $70.56 | Discretionary |
| Feb 17, 2022 | MLAB | $70.6K | Option Exercise | 1,000 | $70.56 | Discretionary |
| Feb 15, 2022 | MLAB | $1.3M | Sale | 5,192 | $259.42 | Discretionary |
| Feb 15, 2022 | MLAB | $52.6K | Option Exercise | 746 | $70.56 | Discretionary |
| Feb 15, 2022 | MLAB | $434.7K | Option Exercise | 4,446 | $97.78 | Discretionary |
| Nov 17, 2021 | MLAB | $70.6K | Option Exercise | 1,000 | $70.56 | Discretionary |