David MacLennan is Director at ECOLAB INC. (ECL). They have made 33 open-market trades across 3 companies since 2012, most recently 2026-09-30.
CIK 0001498535
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.
33 open-market purchases totalling $5.0M since 2012, never a sale. Across 33 scored buys the stock is up 2.2% at ninety days, and 0.1 points behind the S&P over the same stretch.
33 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| ECL | 25,625 | $7.4M |
| CAT | 8,420 | $6.2M |
| CHRW | 1,600 | $223K |
| Total | $13.8M |
Shares reported on the most recent Form 4, priced at the 2026-10-02 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 55% | 73% | 61% |
| Avg Move | +0.4% | +2.0% | +2.2% |
| Alpha | +0.9% | +0.5% | -0.1% |
| Scored | 33 | 33 | 33 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| ECL | BUY | 2026-05-13 | 2026-05-14 | $250.65 | $251K | +5.8% | +8.2% | +12.2% |
| ECL | BUY | 2026-05-04 | 2026-05-05 | $256.91 | $206K | -5.6% | -3.1% | +6.5% |
| CAT | BUY | 2026-05-04 | 2026-05-05 | $876.84 | $219K | -3.4% | +2.3% | -9.6% |
| ECL | BUY | 2025-12-08 | 2025-12-08 | $257.60 | $386K | +2.1% | +4.3% | +9.4% |
| CAT | BUY | 2025-11-06 | 2025-11-06 | $568.86 | $171K | -3.0% | +5.8% | +22.8% |
| ECL | BUY | 2025-08-13 | 2025-08-15 | $278.51 | $167K | -0.3% | -3.8% | -6.8% |
| CAT | BUY | 2025-05-07 | 2025-05-08 | $320.70 | $241K | +7.3% | +10.0% | +31.3% |
| ECL | BUY | 2025-05-07 | 2025-05-09 | $251.75 | $126K | +1.8% | +3.9% | +5.3% |
| ECL | BUY | 2025-02-13 | 2025-02-18 | $264.51 | $106K | +1.0% | -5.4% | -1.9% |
| ECL | BUY | 2024-08-02 | 2024-08-06 | $240.41 | $313K | +2.4% | +5.0% | +4.0% |
| CAT | BUY | 2024-05-03 | 2024-05-06 | $337.39 | $169K | +1.8% | -4.4% | -8.0% |
| ECL | BUY | 2024-05-03 | 2024-05-07 | $227.37 | $296K | -0.1% | +2.8% | -1.1% |
| CAT | BUY | 2024-02-23 | 2024-02-26 | $323.37 | $226K | +4.0% | +11.5% | +6.0% |
| ECL | BUY | 2023-12-01 | 2023-12-04 | $191.53 | $153K | +3.0% | +2.7% | +18.3% |
| ECL | BUY | 2023-08-07 | 2023-08-09 | $183.73 | $239K | -1.9% | -1.1% | -5.4% |
| ECL | BUY | 2023-06-14 | 2023-06-15 | $180.23 | $126K | -1.1% | +2.4% | -1.6% |
| CAT | BUY | 2023-02-17 | 2023-02-21 | $249.29 | $100K | +5.9% | -9.0% | -11.2% |
| ECL | BUY | 2022-11-08 | 2022-11-10 | $139.66 | $112K | -2.2% | -1.2% | -0.7% |
| ECL | BUY | 2022-05-05 | 2022-05-06 | $171.01 | $103K | -4.7% | +3.7% | +1.8% |
| CAT | BUY | 2022-05-05 | 2022-05-06 | $219.82 | $132K | -1.9% | +5.5% | -13.4% |
| ECL | BUY | 2022-02-18 | 2022-02-22 | $179.09 | $107K | -5.6% | -1.0% | -9.5% |
| CAT | BUY | 2022-02-07 | 2022-02-09 | $199.50 | $96K | -5.6% | +6.1% | +0.2% |
| CAT | BUY | 2021-08-04 | 2021-08-05 | $206.20 | $103K | +2.1% | -0.4% | -2.6% |
| CAT | BUY | 2021-05-05 | 2021-05-06 | $237.86 | $200K | +1.6% | +1.7% | -13.2% |
| ECL | BUY | 2020-08-06 | 2020-08-10 | $194.05 | $78K | -2.1% | +2.2% | +9.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.