William A. Zartler is Director & 10% Owner at Solaris Oilfield Infrastructure, Inc. (SOI). They have made 16 open-market trades across 2 companies since 2017, most recently 2026-03-01.
CIK 0001520378
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.
9 open-market purchases totalling $1.7M since 2018, against 7 sales. Across 9 scored buys the stock is up 27.0% at ninety days, and 25.1 points ahead of the S&P over the same stretch.
9 scored purchases · one row per filing · discretionary only
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 56% | 56% | 78% |
| Avg Move | +5.7% | +10.3% | +27.0% |
| Alpha | +6.2% | +11.1% | +25.1% |
| Scored | 9 | 9 | 9 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| SEI | BUY | 2025-09-09 | 2025-09-09 | $24.83 | $497K | +43.7% | +82.1% | +104.3% |
| SEI | BUY | 2025-05-21 | 2025-05-22 | $21.78 | $218K | +12.0% | +11.6% | +9.4% |
| SEI | BUY | 2025-03-07 | 2025-03-07 | $23.23 | $232K | +4.1% | -27.5% | +16.2% |
| SEI | BUY | 2025-03-06 | 2025-03-10 | $24.07 | $241K | +5.0% | -9.4% | +35.5% |
| SOI | SELL | 2022-12-16 | 2022-12-19 | $9.50 | $219K | +4.0% | +6.5% | -15.0% |
| SOI | BUY | 2022-09-15 | 2022-09-16 | $10.47 | $105K | -2.3% | +14.8% | +0.2% |
| SOI | BUY | 2022-05-09 | 2022-05-09 | $10.99 | $77K | +10.9% | +24.8% | -6.9% |
| SOI | BUY | 2021-12-07 | 2021-12-08 | $6.64 | $66K | -4.0% | +14.1% | +66.3% |
| SOI | BUY | 2021-11-22 | 2021-11-23 | $6.71 | $101K | -7.5% | -5.0% | +18.2% |
| SOI | SELL | 2021-03-10 | 2021-03-11 | $12.75 | $5.1M | -12.2% | -20.4% | -27.1% |
| SOI | SELL | 2021-02-25 | 2021-02-26 | $11.00 | $5.5M | +13.4% | +0.7% | -18.4% |
| SOI | BUY | 2018-05-22 | 2018-05-23 | $16.17 | $194K | -10.3% | -13.0% | -0.5% |
| SOI | SELL | 2018-01-11 | 2018-01-16 | $21.65 | $28.6M | -0.2% | -5.9% | -10.0% |
| SOI | SELL | 2017-11-15 | 2017-11-15 | $15.04 | $3.9M | +6.5% | +29.2% | +13.5% |
| SOI | SELL | 2017-11-14 | 2017-11-15 | $15.04 | $34.6M | +6.5% | +29.2% | +13.5% |
| SOI | SELL | 2017-11-14 | 2017-11-15 | $15.04 | $15.0M | +6.5% | +29.2% | +13.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.