Myrtle S. Potter is Director at Guardant Health, Inc. (GH). They have made 11 open-market trades across 5 companies since 2008, most recently 2026-06-22.
CIK 0001214130
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 11 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| GH | 20,971 | $3.3M |
| INSM | 25,510 | $2.5M |
| AMZN | 6,500 | $1.6M |
| ESRX | 8,774 | $810K |
| UROV | 21,480 | $349K |
| MYOV | 9,859 | $266K |
| EVDY | 16,375 | $172K |
| DNA | 10,822 | $111K |
| RAD | 78,790 |
Shares reported on the most recent Form 4, priced at the 2026-06-23 close. 3 holdings could not be priced and are excluded from the total.
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 |
|---|---|---|---|---|---|---|---|---|
| GH | SELL | 2026-06-22 | 2026-06-23 | $131.16 | $204K | +26.8% | +12.8% | +30.6% |
| GH | SELL | 2025-10-17 | 2025-10-20 | $66.95 | $2K | +31.8% | +42.0% | +63.8% |
| GH | SELL | 2025-09-17 | 2025-09-17 | $55.63 | $1K | +8.4% | +14.5% | +74.9% |
| GH | SELL | 2025-08-19 | 2025-08-20 | $59.02 | $2K | +14.4% | +1.8% | +64.4% |
| GH | SELL | 2025-07-17 | 2025-07-18 | $48.20 | $1K | -3.4% | +27.1% | +44.2% |
| GH | SELL | 2025-06-18 | 2025-06-20 | $49.47 | $1K | +3.4% | -5.9% | +21.2% |
| GH | SELL | 2025-06-16 | 2025-06-16 | $49.70 | $261K | +4.4% | -1.9% | +12.4% |
| RAD | SELL | 2017-10-03 | 2017-10-05 | $2.09 | $118K | -1.8% | +18.9% | +18.9% |
| INSM | SELL | 2016-12-13 | 2016-12-15 | $12.79 | $83K | +4.3% | +14.3% | +25.3% |
| EVDY | SELL | 2014-11-20 | 2014-11-24 | $13.13 | $727K | -20.3% | +0.7% | +0.7% |
| ESRX | SELL | 2012-05-21 | 2012-05-22 | $51.87 | $839K | -7.2% | +0.9% | +0.9% |
| AMZN | SELL · 10b5-1 | 2008-08-01 | 2008-08-05 | $76.36 | $458K | -11.3% | -2.9% | -2.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.
| $51K |
| MHS | 100 | — |
| FOXH | 1,186 | — |
| EVVV | 1,921 | — |
| Total | $9.2M |