Personalis's top three insider shareholders as of August 27, 2026 are Ai, Inc. Tempus (TenPercentOwner, 12.72Mn shares), Venture Partners Select Iv, L.P. Lightspeed (Other, 2.09Mn shares), John Stephen West (President And Ceo, 622.44K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Ai, Inc. Tempus | TenPercentOwner | 12,718,800 | 0 | 12,718,800 | 77.9% | 20 Aug, 2024 |
| 2 | Venture Partners Select Iv, L.P. Lightspeed | Other | 4,750 | 2,084,240 | 2,088,990 | 12.8% | 04 Mar, 2022 |
| 3 | John Stephen West | President And Ceo | 622,444 | 0 | 622,444 | 3.8% | 14 Dec, 2022 |
| 4 | Christopher M Hall | Chief Executive Officer | 235,986 | 0 | 235,986 | 1.4% | 09 Jul, 2026 |
| 5 | Aaron Tachibana | Cfo And Coo | 198,833 | 0 | 198,833 | 1.2% | 29 Jun, 2026 |
| 6 | Richard Chen | President And Cmo | 173,880 | 0 | 173,880 | 1.1% | 15 Jul, 2026 |
| 7 | Stephen Michael Moore | Svp And Chief Legal Officer | 92,325 | 0 | 92,325 | 0.6% | 17 Mar, 2026 |
| 8 | Ken Ludlum | Director | 43,506 | 0 | 43,506 | 0.3% | 19 May, 2022 |
| 9 | Lonnie Shoff | Director | 37,190 | 0 | 37,190 | 0.2% | 14 May, 2026 |
| 10 | Woodrow A Jr Myers | Director | 32,366 | 0 | 32,366 | 0.2% | 14 May, 2026 |
| 11 | Olivia Kyusuk Bloom | Director | 27,265 | 0 | 27,265 | 0.2% | 14 May, 2026 |
| 12 | Karin Eastham | Director | 19,756 | 0 | 19,756 | 0.1% | 11 Jun, 2026 |
| 13 | A Blaine Bowman | Director | 13,506 | 0 | 13,506 | 0.1% | 19 May, 2022 |
| 14 | Alan Colowick | Director | 13,506 | 0 | 13,506 | 0.1% | 19 May, 2022 |
| 15 | Kenneth J Widder | Director | 6,250 | 0 | 6,250 | 0.0% | 14 May, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 15 Jul, 2026 | Richard Chen | President And Cmo | Acquired M | 100,000 | $2.44 | $244.00K | 273,880 | Direct |
| 15 Jul, 2026 | Richard Chen | President And Cmo | Disposed S | 100,000 | $15.15 | $1.52Mn | 173,880 | Direct |
| 15 Jul, 2026 | Richard Chen | President And Cmo | Disposed M | 100,000 | $0.00 | $0 | 0 | Direct |
| 09 Jul, 2026 | Christopher M Hall | Chief Executive Officer | Acquired M | 100,000 | $1.61 | $161.00K | 335,986 | Direct |
| 09 Jul, 2026 | Christopher M Hall | Chief Executive Officer | Disposed S | 100,000 | $15.08 | $1.51Mn | 235,986 | Direct |
| 09 Jul, 2026 | Christopher M Hall | Chief Executive Officer | Disposed M | 66,667 | $0.00 | $0 | 133,333 | Direct |
| 09 Jul, 2026 | Christopher M Hall | Chief Executive Officer | Disposed M | 33,333 | $0.00 | $0 | 0 | Direct |
| 29 Jun, 2026 | Aaron Tachibana | Cfo And Coo | Acquired M | 4,982 | $5.32 | $26.50K | 203,815 | Direct |
| 29 Jun, 2026 | Aaron Tachibana | Cfo And Coo | Disposed S | 4,982 | $14.00 | $69.75K | 198,833 | Direct |
| 29 Jun, 2026 | Aaron Tachibana | Cfo And Coo | Disposed M | 4,982 | $0.00 | $0 | 2,489 | Direct |
| 26 Jun, 2026 | Christopher M Hall | Chief Executive Officer | Acquired M | 100,000 | $1.61 | $161.00K | 335,986 | Direct |
| 26 Jun, 2026 | Aaron Tachibana | Cfo And Coo | Acquired M | 28,832 | $9.16 | $264.10K | 227,665 | Direct |
| 26 Jun, 2026 | Christopher M Hall | Chief Executive Officer | Disposed S | 100,000 | $13.15 | $1.32Mn | 235,986 | Direct |
| 26 Jun, 2026 | Aaron Tachibana | Cfo And Coo | Acquired M | 22,419 | $5.32 | $119.27K | 250,084 | Direct |
| 26 Jun, 2026 | Aaron Tachibana | Cfo And Coo | Disposed S | 51,251 | $13.18 | $675.49K | 198,833 | Direct |
| 26 Jun, 2026 | Christopher M Hall | Chief Executive Officer | Disposed M | 100,000 | $0.00 | $0 | 200,000 | Direct |
| 26 Jun, 2026 | Aaron Tachibana | Cfo And Coo | Disposed M | 28,832 | $0.00 | $0 | 0 | Direct |
| 26 Jun, 2026 | Aaron Tachibana | Cfo And Coo | Disposed M | 22,419 | $0.00 | $0 | 7,471 | Direct |
| 12 May, 2026 | Karin Eastham | Director | Acquired A | 6,250 | $0.00 | $0 | 19,756 | Direct |
| 04 Jun, 2026 | Aaron Tachibana | Cfo And Coo | Acquired M | 40,000 | $9.16 | $366.40K | 238,833 | Direct |