Donald F. Robertson Jr. is VP & Chief Accounting Officer at SANDISK CORP (SNDK). They have made 9 open-market trades across 2 companies since 2011, most recently 2026-03-20.
CIK 0001526111
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 | Shares | Value |
|---|---|---|
| NVDA | 341,320 | $62.0M |
| WDC | 29,416 | $7.9M |
| SNDK | 5,694 | $4.6M |
| Total | $74.4M |
Shares reported on the most recent Form 4, priced at the 2026-03-20 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| NVDA | SELL · 10b5-1 | 2026-03-20 | 2026-03-20 | $174.82 | $1.8M | -0.8% | +14.0% | +18.7% |
| NVDA | SELL | 2026-01-02 | 2026-01-06 | $189.85 | $15.2M | -1.2% | -8.9% | -5.8% |
| NVDA | SELL · 10b5-1 | 2025-12-19 | 2025-12-22 | $180.04 | $4.7M | +2.8% | +0.2% | -4.0% |
| NVDA | SELL · 10b5-1 | 2025-09-19 | 2025-09-19 | $176.37 | $1.2M | +6.8% | +4.2% | -0.7% |
| NVDA | SELL · 10b5-1 | 2025-06-20 | 2025-06-23 | $143.66 | $646K | +9.5% | +17.3% | +26.1% |
| NVDA | SELL · 10b5-1 | 2025-03-21 | 2025-03-25 | $116.80 | $526K | -20.6% | -10.4% | +21.4% |
| NVDA | SELL · 10b5-1 | 2024-12-13 | 2024-12-13 | $135.23 | $974K | +4.3% | -0.7% | -13.9% |
| NVDA | SELL · 10b5-1 | 2024-09-20 | 2024-09-20 | $116.51 | $524K | +2.0% | +23.3% | +12.1% |
| NVDA | SELL · 10b5-1 | 2024-06-21 | 2024-06-21 | $128.17 | $577K | +4.1% | +0.2% | -4.4% |
| NVDA | SELL · 10b5-1 | 2024-03-22 | 2024-03-26 | $911.62 | $410K | -6.4% | -11.3% | +26.9% |
| NVDA | SELL · 10b5-1 | 2024-01-05 | 2024-01-09 | $484.62 | $218K | +11.2% | +29.9% | +62.5% |
| NVDA | SELL | 2022-12-15 | 2022-12-16 | $167.89 | $837K | -11.9% | +6.8% | +54.1% |
| SNDK | SELL | 2014-10-23 | 2014-10-23 | $88.55 | $287K | +37.4% | +2.7% | +2.7% |
| SNDK | SELL | 2014-05-12 | 2014-05-12 | $90.00 | $656K | +37.4% | +2.7% | +2.7% |
| SNDK | SELL | 2014-04-23 | 2014-04-24 | $84.75 | $117K | +37.4% | +2.7% | +2.7% |
| SNDK | SELL | 2013-10-29 | 2013-10-31 | $70.15 | $1.1M | +37.4% | +2.7% | +2.7% |
| SNDK | SELL | 2013-02-19 | 2013-02-20 | $51.73 | $666K | +37.4% | +2.7% | +2.7% |
| SNDK | SELL | 2012-02-24 | 2012-02-28 | $49.28 | $30K | +37.4% | +2.7% | +2.7% |
| SNDK | SELL | 2011-10-25 | 2011-10-27 | $49.80 | $1.7M | +37.4% | +2.7% | +2.7% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.