Jonathan Jay Mazelsky Insider Trading Activity
Jonathan Jay Mazelsky has been net-selling over the last 12 months with 0 purchases and 23 sales across 1 company.
IDXX is the most-traded position with 23 trades. The largest single transaction was a sale of IDXX for $4.6M on Aug 6, 2025.
Performance Scorecard
Forward stock performance after each transaction by Jonathan Jay Mazelsky. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.
| PERIOD | AVG BUY RETURN | AVG SELL AVOIDED | SUCCESS RATE | TRADES |
|---|---|---|---|---|
| 30 days | — | +7.9% | 57% | 23 |
| 90 days | — | +3.0% | 57% | 23 |
| 120 days | — | -13.4% | 0% | 10 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
Pro: Trade MarkersIDXX · IDEXX LABORATORIES INC /DE
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Upgrade to ProRecent Trades
| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | ROLE |
|---|---|---|---|---|---|---|
| Feb 26, 2026 | IDXX | Sell | 1,281 | $650.67 | $834K | CEO |
| Feb 26, 2026 | IDXX | Sell | 1,095 | $651.49 | $713K | CEO |
| Feb 26, 2026 | IDXX | Sell | 1,669 | $652.49 | $1.1M | CEO |
| Feb 26, 2026 | IDXX | Sell | 1,171 | $653.68 | $765K | CEO |
| Feb 26, 2026 | IDXX | Sell | 1,111 | $654.63 | $727K | CEO |
| Feb 26, 2026 | IDXX | Sell | 1,488 | $655.85 | $976K | CEO |
| Feb 26, 2026 | IDXX | Sell | 1,343 | $656.85 | $882K | CEO |
| Feb 26, 2026 | IDXX | Sell | 2,860 | $657.84 | $1.9M | CEO |
| Feb 26, 2026 | IDXX | Sell | 3,660 | $658.92 | $2.4M | CEO |
| Feb 26, 2026 | IDXX | Sell | 2,859 | $659.75 | $1.9M | CEO |
| Feb 26, 2026 | IDXX | Sell | 1,200 | $661.10 | $793K | CEO |
| Feb 26, 2026 | IDXX | Sell | 1,000 | $662.16 | $662K | CEO |
| Feb 26, 2026 | IDXX | Sell | 2,589 | $663.04 | $1.7M | CEO |
| Aug 6, 2025 | IDXX | Sell | 1,095 | $626.90 | $686K | CEO |
| Aug 6, 2025 | IDXX | Sell | 1,525 | $628.27 | $958K | CEO |
| Aug 6, 2025 | IDXX | Sell | 3,397 | $629.82 | $2.1M | CEO |
| Aug 6, 2025 | IDXX | Sell | 6,056 | $630.59 | $3.8M | CEO |
| Aug 6, 2025 | IDXX | Sell | 7,299 | $631.61 | $4.6M | CEO |
| Aug 6, 2025 | IDXX | Sell | 3,000 | $632.56 | $1.9M | CEO |
| Aug 6, 2025 | IDXX | Sell | 3,526 | $635.13 | $2.2M | CEO |
| Aug 6, 2025 | IDXX | Sell | 1,822 | $636.15 | $1.2M | CEO |
| Aug 6, 2025 | IDXX | Sell | 880 | $636.81 | $560K | CEO |
| Aug 6, 2025 | IDXX | Sell | 660 | $639.37 | $422K | CEO |
Top Companies Traded
| TICKER | COMPANY | TRADES | TOTAL VOLUME |
|---|---|---|---|
| IDXX | IDEXX LABORATORIES INC /DE | 23 | $33.8M |
Other insiders at IDEXX LABORATORIES INC /DE
4 other tracked filers at IDXX.