The Form 144 signals a planned insider sale, but the presence of a 10b5-1 plan and the relatively small size relative to market cap suggest routine portfolio diversification rather than a negative signal. Monitor for any acceleration of insider selling or changes in the 10b5-1 plan.
Price Chart
Executive Summary
Aaron Tachibana, an officer of Personalis, Inc., filed a Form 144 on June 4, 2026, indicating intent to sell 40,000 shares of common stock with an estimated aggregate market value of $431,200. The shares are to be sold through Morgan Stanley Smith Barney and are sourced from the exercise of stock options. This filing follows a recent 10b5-1 plan sale of 38,799 shares on May 29, 2026, for approximately $449,273, suggesting a pre-planned, systematic disposition.
Key Facts
- Officer Aaron Tachibana filed Form 144 to sell 40,000 shares of common stock.
- Estimated aggregate market value of the proposed sale is $431,200.
- Shares are to be sold via Morgan Stanley Smith Barney and sourced from stock option exercises.
- Tachibana executed a 10b5-1 plan sale of 38,799 shares on May 29, 2026, for ~$449,273.
- The filing date is June 4, 2026; the proposed sale is also dated June 4, 2026.
Financial Impact
Proposed sale of 40,000 shares valued at $431,200; represents approximately 0.03% of the company's $1.3B market cap.
Risk Factors
- Insider selling could be perceived negatively by the market if it accelerates or if other insiders follow suit.
- The filing is an intent to sell; the actual sale may not occur, but the signal of intent is already public.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 144 Filing (Primary) | 0001950047-26-005657 |
| Document: 0001950047-26-005657-index.html | 0001950047-26-005657 |
| Document: 0001950047-26-005657.txt | 0001950047-26-005657 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Aug 9, 2026 7w ago | Institutional Cluster | $14.50 $16.60 | ▲ +14.48% | ▲ +15.40% | $16.28 (+12.28%) |
Jul 20, 2026 10w ago | 425 | $13.44 $13.91 | ▲ +3.50% | ▲ +0.94% | $16.28 (+21.13%) |
Jul 20, 2026 10w ago | 8-K | $13.44 $13.91 | ▲ +3.50% | ▲ +0.94% | $16.28 (+21.13%) |
Jul 20, 2026 10w ago | 425 | $13.34 $13.89 | ▲ +4.12% | ▲ +0.00% | $16.28 (+22.04%) |
Jul 20, 2026 10w ago | 8-K | $13.34 $13.89 | ▲ +4.12% | ▲ +0.00% | $16.28 (+22.04%) |
Jul 16, 2026 11w ago | Insider Cluster | $15.58 $14.42 | ▼ −7.45% | ▼ −11.06% | $16.28 (+4.49%) |
Jun 29, 2026 13w ago | 144 | $13.40 $11.98 | ▼ −10.60% | ▼ −9.57% | $16.28 (+21.49%) |
Jun 26, 2026 14w ago | 144 | $13.75 $11.78 | ▼ −14.33% | ▼ −14.05% | $16.28 (+18.40%) |
Jun 26, 2026 14w ago | 144 | $13.75 $11.78 | ▼ −14.33% | ▼ −14.05% | $16.28 (+18.40%) |
Jun 6, 2026 16w ago | Insider Cluster | $10.04 $14.34 | ▲ +42.83% | ▲ +41.20% | $16.28 (+62.15%) |
US Market Status
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