M. Anne Szostak is Director at IDEXX LABORATORIES INC /DE (IDXX). They have made 29 open-market trades across 5 companies since 2006, most recently 2026-05-07.
CIK 0001094176
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
8 open-market purchases totalling $1.1M since 2006, against 21 sales. Across 8 scored buys the stock is down 2.0% at ninety days, and 4.4 points behind the S&P over the same stretch.
8 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 38% | 63% | 38% |
| Avg Move | -1.9% | +0.0% | -2.0% |
| Alpha | +1.5% | -1.0% | -4.4% |
| Scored | 8 | 8 | 8 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| IDXX | SELL | 2025-08-22 | 2025-08-26 | $647.33 | $2.8M | +1.6% | -3.8% | +17.0% |
| IDXX | SELL | 2025-05-21 | 2025-05-23 | $512.97 | $2.4M | +3.0% | +3.5% | +24.9% |
| IDXX | SELL | 2025-02-07 | 2025-02-10 | $465.95 | $1.4M | -1.7% | -10.5% | +10.6% |
| IDXX | SELL | 2024-09-06 | 2024-09-09 | $469.37 | $235K | +7.5% | -1.3% | -6.3% |
| IDXX | SELL | 2023-05-05 | 2023-05-08 | $474.89 | $950K | +2.1% | -6.5% | +5.4% |
| IDXX | SELL | 2022-12-02 | 2022-12-06 | $428.55 | $317K | -1.3% | +1.5% | +17.7% |
| IDXX | SELL | 2021-08-06 | 2021-08-09 | $687.37 | $3.5M | -0.9% | -0.1% | -7.8% |
| IDXX | SELL | 2021-02-04 | 2021-02-08 | $489.59 | $10.9M | +9.4% | -1.7% | +5.6% |
| TUP | SELL | 2020-11-10 | 2020-11-10 | $28.43 | $28K | +18.8% | +16.7% | +23.5% |
| IDXX | SELL | 2020-05-29 | 2020-06-02 | $306.90 | $4.7M | -4.0% | +6.1% | +24.0% |
| IDXX | SELL | 2020-02-18 | 2020-02-20 | $286.24 | $4.7M | -10.5% | -34.8% | +5.3% |
| IDXX | SELL | 2019-11-04 | 2019-11-05 | $279.51 | $1.2M | -1.5% | -4.5% | +4.6% |
| IDXX | SELL | 2019-02-14 | 2019-02-19 | $208.96 | $2.5M | +2.2% | +6.8% | +17.6% |
| TUP | BUY | 2019-02-01 | 2019-02-04 | $27.27 | $82K | +5.4% | +0.7% | -14.1% |
| TUP | BUY | 2018-05-11 | 2018-05-11 | $43.45 | $87K | +3.8% | +1.1% | -19.4% |
| DPS | SELL | 2016-05-11 | 2016-05-13 | $94.77 | $284K | -3.2% | -3.3% | +2.3% |
| IDXX | BUY | 2016-02-17 | 2016-02-25 | $69.94 | $140K | +5.0% | +3.2% | +22.5% |
| DPS | SELL | 2015-12-08 | 2015-12-09 | $91.58 | $201K | -1.7% | +0.5% | -1.3% |
| DPS | SELL | 2015-10-23 | 2015-10-26 | $89.69 | $45K | -1.7% | +0.3% | -1.0% |
| IDXX | BUY | 2014-08-13 | 2014-08-14 | $127.03 | $254K | -6.8% | -1.7% | -1.7% |
| DPS | SELL | 2014-07-28 | 2014-07-28 | $61.45 | $154K | -1.7% | +0.3% | +0.3% |
| IDXX | BUY | 2014-02-20 | 2014-02-24 | $126.71 | $253K | -6.8% | -1.7% | -1.7% |
| IDXX | BUY | 2013-11-04 | 2013-11-06 | $108.24 | $108K | -6.8% | -1.7% | -1.7% |
| TUP | SELL | 2011-03-09 | 2011-03-11 | $57.46 | $460K | -8.8% | +0.6% | +0.6% |
| DPS | BUY | 2010-03-01 | 2010-03-01 | $32.02 | $77K | -1.7% | +0.3% | +0.3% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
| $720K |
Shares reported on the most recent Form 4, priced at the 2026-05-11 close. 2 holdings could not be priced and are excluded from the total.