Personalis Inc
Ownership
Ownership Structure
Who owns Personalis Inc (PSNL)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 80.9% of the shares are freely tradable; institutional investors hold 66.7%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Merck & Co Inc | 13.15 | 14,044,943 | +0.0 | 06/30/2026 |
| ARK Investment Management LLC | 7.74 | 8,271,339 | +4.1 | 06/30/2026 |
| BlackRock Inc | 6.63 | 7,082,491 | +31.4 | 06/30/2026 |
| Lightspeed Management Co LLC | 5.71 | 6,101,850 | -25.2 | 06/30/2026 |
| Ameriprise Financial Inc | 5.70 | 6,086,315 | -19.8 | 06/30/2026 |
| Deep Track Capital, LP | 3.75 | 4,000,000 | +33.3 | 06/30/2026 |
| Aberdeen Group PLC | 3.51 | 3,747,290 | +7.4 | 06/30/2026 |
| Vanguard Capital Management, LLC | 2.82 | 3,010,150 | +4.9 | 06/30/2026 |
| Casdin Capital, LLC | 2.39 | 2,550,000 | +59.4 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| ARK Genomic Revolution ETF | 6.23 | 6,656,965 | +0.2 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Hall Christopher M | Chief Executive Officer | 228,527 | 3,610,727 $ | Sep 18, 2026 | direct |
| Tachibana Aaron | CFO AND COO | 195,902 | 3,095,252 $ | Sep 18, 2026 | direct |
| Chen Richard | President and CMO | 169,882 | 2,684,136 $ | Sep 18, 2026 | direct |
| Moore Stephen Michael | SVP and Chief Legal Officer | 90,257 | 1,426,061 $ | Sep 18, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 18, 2026 | Moore Stephen Michael | SVP and Chief Legal Officer | Sell | 2,068 | 16.22 | 33,543 |
| Sep 18, 2026 | Chen Richard | President and CMO | Sell | 3,998 | 16.22 | 64,848 |
| Sep 18, 2026 | Hall Christopher M | Chief Executive Officer | Sell | 7,459 | 16.22 | 120,985 |
| Sep 18, 2026 | Tachibana Aaron | CFO AND COO | Sell | 2,931 | 16.22 | 47,541 |
| Jul 15, 2026 | Chen Richard | President and CMO | Sell | 100,000 | 15.15 | 1,515,000 |
| Jul 15, 2026 | Chen Richard | President and CMO | Other | 100,000 | 2.44 | 244,000 |
| Jul 9, 2026 | Hall Christopher M | Chief Executive Officer | Sell | 100,000 | 15.08 | 1,508,000 |
| Jul 9, 2026 | Hall Christopher M | Chief Executive Officer | Other | 100,000 | 1.61 | 161,000 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 30, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.