Jonathan Jay Mazelsky sold $18M of IDXX
President and CEO at IDEXX LABORATORIES INC /DE. 29,260 shares at an average of $631.98, traded Aug 6, 2025, filed Aug 8, 2025.
Score components
- +25RoleCEO
- +25Trade size$18.5M at market
- +10Share of holdings soldSold 26% of holdings
- +15Cluster5 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 0000874716-25-000126, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Aug 6, 2025 | MOption exercise Common Stock | +29,260 | $67.85 | $2.0M | 112,571 | Aug 8, 2025 |
| Aug 6, 2025 | SOpen-market sale Common Stock | -1,095 | $626.90 | $686k | 111,476 | Aug 8, 2025 |
| Aug 6, 2025 | SOpen-market sale Common Stock | -1,525 | $628.27 | $958k | 109,951 | Aug 8, 2025 |
| Aug 6, 2025 | SOpen-market sale Common Stock | -3,397 | $629.82 | $2.1M | 106,554 | Aug 8, 2025 |
| Aug 6, 2025 | SOpen-market sale Common Stock | -6,056 | $630.59 | $3.8M | 100,498 | Aug 8, 2025 |
| Aug 6, 2025 | SOpen-market sale Common Stock | -7,299 | $631.61 | $4.6M | 93,199 | Aug 8, 2025 |
| Aug 6, 2025 | SOpen-market sale Common Stock | -3,000 | $632.56 | $1.9M | 90,199 | Aug 8, 2025 |
| Aug 6, 2025 | SOpen-market sale Common Stock | -3,526 | $635.13 | $2.2M | 86,673 | Aug 8, 2025 |
| Aug 6, 2025 | SOpen-market sale Common Stock | -1,822 | $636.15 | $1.2M | 84,851 | Aug 8, 2025 |
| Aug 6, 2025 | SOpen-market sale Common Stock | -880 | $636.81 | $560k | 83,971 | Aug 8, 2025 |
| Aug 6, 2025 | SOpen-market sale Common Stock | -660 | $639.37 | $422k | 83,311 | Aug 8, 2025 |
| Aug 6, 2025 | MOption exercise Non-Qualified Stock Option (right-to-buy)derivative | -29,260 | - | - | 0 | Aug 8, 2025 |
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% | |
| 55Moderate | IDEXX LABORATORIES INC /DE | Jonathan Jay Mazelsky President and CEO | $15M 23,326 shares | -22% | |
| 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% |
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.