John James Sullivan insider trades: Mesa Laboratories (MLAB) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where John reports to the SEC
Open-market buys and sales
34 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 13, 2026 | MLAB | ↓ Sell | 7,093 | $112.80 | $800K | Direct | Aug 17, 2026 (4d) |
| Jun 7, 2022 | MLAB | ↓ Sell | 5,192 | $207.76 | $1.1M | Direct | Jun 13, 2022 (6d) |
| Feb 15, 2022 | MLAB | ↓ Sell10b5-1 | 5,192 | $259.42 | $1.3M | Direct | Feb 16, 2022 (1d) |
| Nov 15, 2021 | MLAB | ↓ Sell10b5-1 | 5,192 | $308.02 | $1.6M | Direct | Nov 16, 2021 (1d) |
| Oct 1, 2021 | MLAB | ↓ Sell | 1,250 | $304.48 | $381K | Direct | Oct 4, 2021 (3d) |
| Sep 1, 2021 | MLAB | ↓ Sell | 1,250 | $268.22 | $335K | Direct | Sep 1, 2021 (0d) |
| Aug 16, 2021 | MLAB | ↓ Sell | 5,192 | $272.16 | $1.4M | Direct | Aug 17, 2021 (1d) |
| Aug 2, 2021 | MLAB | ↓ Sell | 1,250 | $290.47 | $363K | Direct | Aug 2, 2021 (0d) |
| Jul 1, 2021 | MLAB | ↓ Sell | 1,250 | $267.44 | $334K | Direct | Jul 6, 2021 (5d) |
| Jun 8, 2021 | MLAB | ↓ Sell | 5,192 | $258.19 | $1.3M | Direct | Jun 9, 2021 (1d) |
| Jun 1, 2021 | MLAB | ↓ Sell | 2,215 | $251.46 | $557K | Direct | Jun 4, 2021 (3d) |
| May 6, 2021 | MLAB | ↓ Sell | 300 | $250.23 | $75K | Direct | May 7, 2021 (1d) |
| May 4, 2021 | MLAB | ↓ Sell | 735 | $250.14 | $184K | Direct | May 5, 2021 (1d) |
| Apr 5, 2021 | MLAB | ↓ Sell | 500 | $250.76 | $125K | Direct | Apr 5, 2021 (0d) |
| Mar 1, 2021 | MLAB | ↓ Sell | 1,250 | $273.94 | $342K | Direct | Mar 2, 2021 (1d) |
| Feb 1, 2021 | MLAB | ↓ Sell | 1,250 | $277.67 | $347K | Direct | Feb 1, 2021 (0d) |
| Jan 4, 2021 | MLAB | ↓ Sell | 1,250 | $280.82 | $351K | Direct | Jan 4, 2021 (0d) |
| Dec 1, 2020 | MLAB | ↓ Sell | 1,250 | $275.22 | $344K | Direct | Dec 1, 2020 (0d) |
| Nov 11, 2020 | MLAB | ↓ Sell | 1,250 | $272.36 | $340K | Direct | Nov 12, 2020 (1d) |
| Feb 27, 2020 | MLAB | ↓ Sell | 1,702 | $256.02 | $436K | Direct | Feb 27, 2020 (0d) |
| Feb 26, 2020 | MLAB | ↓ Sell | 9,276 | $266.66 | $2.5M | Direct | Feb 27, 2020 (1d) |
| Jun 15, 2018 | MLAB | ↓ Sell | 12,000 | $197.02 | $2.4M | Direct | Jun 15, 2018 (0d) |
| Feb 16, 2018 | MLAB | ↓ Sell | 4,000 | $138.00 | $552K | Direct | Feb 20, 2018 (4d) |
| Feb 21, 2017 | MLAB | ↓ Sell | 9,078 | $124.83 | $1.1M | Direct | Feb 21, 2017 (0d) |
| Feb 13, 2017 | MLAB | ↓ Sell | 5,922 | $123.99 | $734K | Direct | Feb 15, 2017 (2d) |
| Jun 22, 2016 | MLAB | ↓ Sell | 4,000 | $121.63 | $487K | Direct | Jun 23, 2016 (1d) |
| Nov 6, 2015 | MLAB | ↓ Sell | 2,400 | $112.99 | $271K | Direct | Nov 9, 2015 (3d) |
| Feb 25, 2014 | MLAB | ↓ Sell | 10,000 | $87.01 | $870K | Direct | Feb 26, 2014 (1d) |
| Aug 19, 2013 | MLAB | ↓ Sell | 6,000 | $64.87 | $389K | Direct | Aug 20, 2013 (1d) |
| Aug 14, 2013 | MLAB | ↓ Sell | 6,000 | $61.92 | $372K | Direct | Aug 15, 2013 (1d) |
| Sep 22, 2006 | MLAB | ↑ Buy | 150 | $16.50 | $2K | Direct | Sep 26, 2006 (4d) |
| Aug 15, 2006 | MLAB | ↑ Buy | 928 | $15.60 | $14K | Direct | Aug 17, 2006 (2d) |
| Dec 9, 2005 | MLAB | ↑ Buy | 832 | $15.73 | $13K | Direct | Dec 9, 2005 (0d) |
| Jun 16, 2005 | MLAB | ↑ Buy | 2,000 | $11.90 | $24K | Direct | Jun 17, 2005 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other MLAB insiders
Open-market trades in the last 12 months
About John James Sullivan's insider trades
John James Sullivan is a director at Mesa Laboratories (MLAB). Since Jun 16, 2005, John has reported 4 open-market purchases worth $54K and 30 sales worth $21.7M on SEC Form 4. In the last 12 months: 1 sale ($800K).
2 sales (14% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include option exercises (51 filings), grants and awards (22 filings), gifts (9 filings), shares withheld for taxes (7 filings). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every MLAB insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.