Stephen Robertson is Director & 10% Owner at WillScot Mobile Mini Holdings Corp. (WSC). They have made 11 open-market trades across 2 companies since 2017, most recently 2026-05-21.
CIK 0001409360
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.
6 open-market purchases totalling $835.1M since 2017, against 5 sales. Across 6 scored buys the stock is up 1.1% at ninety days, and 1.7 points behind the S&P over the same stretch.
6 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| TH | 752,397 | $11.6M |
| WSC | 100,000 | $1.6M |
| Total | $13.2M |
Shares reported on the most recent Form 4, priced at the 2026-05-26 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 83% | 83% | 50% |
| Avg Move | +3.6% | +8.6% | +1.1% |
| Alpha | +3.1% | +6.5% | -1.7% |
| Scored | 6 | 6 | 6 |
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 60% | 0% | 20% |
| Avg Move | +1.0% | +4.6% | +13.5% |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| TH | BUY | 2025-12-03 | 2025-12-04 | $7.94 | $993K | +5.1% | +0.2% | -0.7% |
| TH | BUY | 2025-11-17 | 2025-11-19 | $6.85 | $993K | +8.8% | +13.6% | -0.1% |
| WSC | SELL | 2021-09-14 | 2021-09-16 | $28.20 | $1.3B | -3.1% | +1.9% | +23.5% |
| WSC | SELL | 2021-07-06 | 2021-07-06 | $27.75 | $58.3M | -0.2% | +3.9% | +16.5% |
| WSC | SELL | 2021-06-25 | 2021-06-28 | $27.75 | $496.7M | -0.9% | +0.2% | +14.7% |
| WSC | SELL | 2021-05-13 | 2021-05-17 | $29.41 | $27.9M | +3.5% | +3.4% | -0.9% |
| WSC | SELL | 2021-03-04 | 2021-03-08 | $26.79 | $466.5M | +6.0% | +13.3% | +13.9% |
| TH | BUY | 2019-08-16 | 2019-08-19 | $6.77 | $1.2M | -18.7% | -3.5% | -40.0% |
| WSC | BUY | 2019-03-22 | 2019-03-25 | $11.55 | $1.2M | +7.3% | +16.8% | +29.1% |
| WSC | BUY | 2017-12-06 | 2017-12-08 | $0.00 | $0 | +10.0% | +8.3% | +10.0% |
| WSC | BUY | 2017-11-29 | 2017-12-01 | $9.60 | $830.8M | +9.4% | +16.1% | +8.1% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
| Scored | 5 | 5 | 5 |