Jonathan Jay Mazelsky sold $15M of IDXX
President and CEO at IDEXX LABORATORIES INC /DE. 23,326 shares at an average of $657.55, traded Feb 26, 2026, filed Mar 2, 2026.
Score components
- +25RoleCEO
- +25Trade size$15.3M at market
- +5Share of holdings soldSold 22% of holdings
- +15Cluster4 insiders selling within 14 days
- -15Exercise and sellShares came from an option exercise in the same filing
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0000874716-26-000043, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Feb 26, 2026 | MOption exercise Common Stock | +23,326 | $141.60 | $3.3M | 106,932 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -1,281 | $650.67 | $834k | 105,651 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -1,095 | $651.49 | $713k | 104,556 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -1,669 | $652.49 | $1.1M | 102,887 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -1,171 | $653.68 | $765k | 101,716 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -1,111 | $654.63 | $727k | 100,605 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -1,488 | $655.85 | $976k | 99,117 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -1,343 | $656.85 | $882k | 97,774 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -2,860 | $657.84 | $1.9M | 94,914 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -3,660 | $658.92 | $2.4M | 91,254 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -2,859 | $659.75 | $1.9M | 88,395 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -1,200 | $661.10 | $793k | 87,195 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -1,000 | $662.16 | $662k | 86,195 | Mar 2, 2026 |
| Feb 26, 2026 | SOpen-market sale Common Stock | -2,589 | $663.04 | $1.7M | 83,606 | Mar 2, 2026 |
| Feb 27, 2026 | MOption exercise Common Stock | +197 | $505.53 | $100k | 83,803 | Mar 2, 2026 |
| Feb 26, 2026 | MOption exercise Non-Qualified Stock Option (right-to-buy)derivative | -23,326 | $0.00 | $0 | 0 | Mar 2, 2026 |
| Feb 27, 2026 | MOption exercise Incentive Stock Option (right-to-buy)derivative | -197 | $0.00 | $0 | 0 | Mar 2, 2026 |
Related signals
Other insiders at IDEXX LABORATORIES INC /DE and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 30Weak | IDXXsell IDEXX LABORATORIES INC /DE | Lawrence D Kingsley director | $1.2M 2,203 shares | -19% | |
| 55Moderate | IDEXX LABORATORIES INC /DE | Nimrata Hunt Executive Vice President | $1.1M 1,758 shares | -9% | |
| 60Notable | IDEXX LABORATORIES INC /DE | Nimrata Hunt Executive Vice President | $1.8M 2,693 shares | -12% | |
| 50Moderate | IDEXX LABORATORIES INC /DE | Michael G Erickson Executive Vice President | $3.4M 5,371 shares | -30% | |
| 59Moderate | IDEXX LABORATORIES INC /DE | Sophie V. Vandebroek director | $920k 1,464 shares | -69% | |
| 60Notable | IDEXX LABORATORIES INC /DE | George Fennell Executive Vice President | $7.3M 11,345 shares | -54% | |
| 35Weak | IDXXsell IDEXX LABORATORIES INC /DE | Nimrata Hunt Executive Vice President | $6.6M 9,425 shares | -31% | |
| 60Notable | IDEXX LABORATORIES INC /DE | M Anne Szostak director | $1.4M 2,187 shares | -89% | |
| 43Moderate | IDEXX LABORATORIES INC /DE | Michael G Erickson Executive Vice President | $264k 406 shares | -3% | |
| 37Weak | IDEXX LABORATORIES INC /DE | Nimrata Hunt Executive Vice President | $788k 1,200 shares | -7% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.