Based on data from the past 90 days ending January 10, 2026, Personalis's three largest insider shareholders are TenPercentOwner Ai, Inc. Tempus (12.72Mn shares), Other Venture Partners Select Iv, L.P. Lightspeed (2.09Mn shares), President And Ceo John Stephen West (622.44K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Ai, Inc. Tempus | 12,718,800 | 20 Aug, 2024 | |
| Venture Partners Select Iv, L.P. Lightspeed | 2,088,990 | 04 Mar, 2022 | |
| John Stephen West | President And Ceo | 622,444 | 14 Dec, 2022 |
| Aaron Tachibana | Cfo And Coo | 164,458 | 28 Nov, 2025 |
| Christopher M Hall | President And Ceo | 148,486 | 05 Nov, 2025 |
| Richard Chen | Chief Medical Officer And Evp | 124,505 | 30 Jul, 2025 |
| Stephen Michael Moore | Svp And Chief Legal Officer | 64,200 | 20 May, 2025 |
| Ken Ludlum | 43,506 | 19 May, 2022 | |
| Lonnie Shoff | 30,940 | 04 Aug, 2022 | |
| Woodrow A Jr Myers | 26,116 | 05 Mar, 2024 | |
| Olivia Kyusuk Bloom | 21,015 | 19 May, 2022 | |
| A Blaine Bowman | 13,506 | 19 May, 2022 | |
| Alan Colowick | 13,506 | 19 May, 2022 | |
| Karin Eastham | 13,506 | 19 May, 2022 | |
| Jonathan Macquitty | 2,736 | 18 May, 2021 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 25 Nov, 2025 | Aaron Tachibana | Common Stock | D | 103,668 | $10.78 | 164,458 | D | S |
| 25 Nov, 2025 | Aaron Tachibana | Common Stock | A | 103,668 | $9.16 | 268,126 | D | M |
| 03 Nov, 2025 | Christopher M Hall | Common Stock | D | 29,612 | $8.99 | 148,486 | D | S |
| 28 Jul, 2025 | Aaron Tachibana | Common Stock | D | 641 | $6.57 | 164,458 | D | S |
| 28 Jul, 2025 | Richard Chen | - | - | 124,505 | D | |||
| 28 Jul, 2025 | Richard Chen | Common Stock | D | 452 | $6.57 | 124,505 | D | S |
| 16 May, 2025 | Aaron Tachibana | Common Stock | D | 1,291 | $4.95 | 165,099 | D | S |
| 16 May, 2025 | Richard Chen | Common Stock | D | 910 | $4.95 | 124,957 | D | S |
| 16 May, 2025 | Stephen Michael Moore | - | - | 64,200 | D | |||
| 16 May, 2025 | Stephen Michael Moore | Common Stock | D | 1,675 | $4.95 | 64,200 | D | S |
| 28 Jan, 2025 | Aaron Tachibana | Common Stock | D | 708 | $5.79 | 166,390 | D | S |
| 28 Jan, 2025 | Richard Chen | Common Stock | D | 519 | $5.79 | 123,367 | D | S |
| 16 Dec, 2024 | Aaron Tachibana | Common Stock | D | 6,865 | $3.82 | 167,098 | D | S |
| 16 Dec, 2024 | Richard Chen | Common Stock | D | 4,834 | $3.82 | 123,886 | D | S |
| 16 Dec, 2024 | Stephen Michael Moore | Common Stock | D | 1,513 | $3.82 | 65,875 | D | S |
| 18 Nov, 2024 | Aaron Tachibana | Common Stock | D | 1,307 | $3.79 | 173,963 | D | S |
| 18 Nov, 2024 | Richard Chen | Common Stock | D | 921 | $3.79 | 128,720 | D | S |
| 18 Nov, 2024 | Stephen Michael Moore | - | - | 67,388 | D | |||
| 18 Nov, 2024 | Stephen Michael Moore | Common Stock | D | 1,693 | $3.79 | 67,388 | D | S |
| 01 Nov, 2024 | Christopher M Hall | Common Stock | D | 26,443 | $5.38 | 178,098 | D | S |