Aaron Tachibana is COO & CFO at Personalis, Inc. (PSNL). They have made 57 open-market trades across 4 companies since 2008, most recently 2026-09-18.
CIK 0001401786
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.
1 open-market purchase totalling $10K since 2008, against 56 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| LITE | 73,724 | $60.7M |
| PSNL | 195,902 | $3.1M |
| ASYT | 313,232 | — |
| PSEM | 30,251 | — |
| Total | $63.7M |
Shares reported on the most recent Form 4, priced at the 2026-09-22 close. 2 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 |
|---|---|---|---|---|---|---|---|---|
| PSNL | SELL | 2026-09-18 | 2026-09-22 | $16.22 | $48K | +0.6% | — | — |
| PSNL | SELL · 10b5-1 | 2026-06-29 | 2026-06-29 | $14.00 | $70K | +3.3% | -13.9% | +20.0% |
| PSNL | SELL · 10b5-1 | 2026-06-26 | 2026-06-26 | $13.18 | $675K | +13.3% | -7.2% | +28.1% |
| PSNL | SELL · 10b5-1 | 2026-06-04 | 2026-06-05 | $12.01 | $480K | -10.5% | +32.5% | +55.0% |
| PSNL | SELL · 10b5-1 | 2026-05-29 | 2026-05-29 | $11.58 | $449K | -12.3% | +25.7% | +53.3% |
| PSNL | SELL | 2026-01-22 | 2026-01-23 | $11.50 | $14K | -19.2% | -19.4% | -42.6% |
| PSNL | SELL · 10b5-1 | 2025-11-25 | 2025-11-28 | $10.78 | $2.2M | -8.2% | -21.5% | -10.6% |
| PSNL | SELL | 2025-07-28 | 2025-07-30 | $6.57 | $4K | -18.0% | -10.9% | +77.6% |
| PSNL | SELL | 2025-05-16 | 2025-05-20 | $4.95 | $6K | -1.0% | +31.6% | -0.6% |
| PSNL | SELL | 2025-01-28 | 2025-01-30 | $5.79 | $4K | -10.9% | -23.3% | -29.5% |
| PSNL | SELL | 2024-12-16 | 2024-12-18 | $3.82 | $26K | +51.7% | +28.3% | -5.8% |
| PSNL | SELL | 2024-11-18 | 2024-11-20 | $3.79 | $5K | +11.1% | +64.3% | +72.6% |
| PSNL | SELL | 2024-07-30 | 2024-08-01 | $2.97 | $2K | +40.4% | +57.2% | +56.3% |
| PSNL | SELL | 2024-06-17 | 2024-06-20 | $1.29 | $9K | -1.6% | +144.3% | +352.5% |
| PSNL | SELL | 2024-05-17 | 2024-05-21 | $1.38 | $2K | -1.4% | -16.3% | +297.3% |
| PSNL | SELL | 2024-01-29 | 2024-01-31 | $1.37 | $981 | -1.5% | +24.3% | +8.1% |
| PSNL | SELL | 2023-12-15 | 2023-12-19 | $1.47 | $10K | +34.2% | +6.6% | +7.2% |
| PSNL | SELL | 2023-11-16 | 2023-11-20 | $1.04 | $1K | +8.1% | +7.4% | -7.4% |
| PSNL | SELL | 2023-07-31 | 2023-08-02 | $2.26 | $1K | -12.9% | -14.7% | -55.7% |
| PSNL | SELL | 2023-06-16 | 2023-06-21 | $2.07 | $14K | -8.4% | +10.8% | -36.0% |
| PSNL | SELL | 2023-05-17 | 2023-05-19 | $1.98 | $3K | -11.9% | -5.0% | -19.3% |
| PSNL | SELL | 2023-03-17 | 2023-03-21 | $2.83 | $11K | -1.1% | -11.8% | -25.8% |
| PSNL | SELL | 2023-01-31 | 2023-02-02 | $2.20 | $2K | +11.0% | -6.1% | -21.7% |
| PSNL | SELL | 2022-12-20 | 2022-12-22 | $1.92 | $7K | +19.0% | +28.8% | +46.2% |
| PSNL | SELL | 2022-12-15 | 2022-12-19 | $2.50 | $18K | +3.1% | +27.1% | +39.6% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.