John T. Preston is Director at CLEAN HARBORS INC (CLH). They have made 9 open-market trades across 2 companies since 2008, most recently 2026-05-20.
CIK 0000938731
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.
0 open-market purchases, against 9 sales. Too few scored purchases to measure a record yet.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| CLH | SELL | 2024-03-14 | 2024-03-15 | $188.36 | $721K | +6.3% | +3.2% | +17.4% |
| CLH | SELL | 2023-08-16 | 2023-08-17 | $173.68 | $728K | +2.6% | +0.6% | -1.4% |
| CLH | SELL | 2023-03-02 | 2023-03-03 | $134.90 | $506K | -2.4% | +3.4% | +5.3% |
| CLH | SELL | 2022-08-08 | 2022-08-09 | $111.50 | $242K | +5.3% | +9.6% | +0.3% |
| CLH | SELL | 2021-02-26 | 2021-03-02 | $85.49 | $1.0M | +7.0% | +2.2% | +11.6% |
| CLH | SELL | 2018-03-06 | 2018-03-08 | $50.93 | $255K | -1.7% | -8.2% | +2.0% |
| CLH | SELL | 2015-05-13 | 2015-05-14 | $56.06 | $254K | -4.3% | +2.5% | +2.5% |
| CLH | SELL | 2011-04-07 | 2011-04-11 | $104.61 | $628K | -4.3% | +2.5% | +2.5% |
| CLHB | SELL | 2008-03-18 | 2008-03-19 | $63.07 | $378K | N/A | N/A | N/A |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.