Personalis, Inc. (PSNL) has 20 known insider and institutional holders on record. The largest holder is Merck & Co., Inc. with 14,044,943 shares. Other notable holders include Tempus AI, Inc. and Abingworth LLP.
Over the last 12 months, insiders have made 32 transactions in PSNL stock — 24 buys (valued at $4.03M) and 6 sells (valued at $292.58K). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
PSNL Insider Ownership
Top Holder
Merck & Co., Inc.
14,044,943 shares
Buys (12 mo)
24
$4.03M value
Sells (12 mo)
6
$292.58K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Merck & Co., Inc. |
10 Percent Owner |
14,044,943 |
2024-12-23 |
|
| 2 |
Tempus Ai, Inc. |
10 Percent Owner |
12,783,550 |
2026-02-13 |
|
| 3 |
Abingworth Llp |
Officer |
3,753,340 |
2020-10-21 |
|
| 4 |
Lightspeed Venture Partners Select Iv, L.p. |
Other: Affiliate of 10% Owner |
1,823,229 |
2022-03-04 |
|
| 5 |
West John Stephen |
President and CEO |
239,999 |
2022-12-14 |
|
| 6 |
Hall Christopher M |
Chief Executive Officer |
235,986 |
2026-03-17 |
|
| 7 |
Tachibana Aaron |
CFO and COO |
198,833 |
2026-03-17 |
|
| 8 |
Chen Richard |
President and CMO |
173,880 |
2026-03-17 |
|
| 9 |
Lefkofsky Eric P |
10 Percent Owner |
150,000 |
2024-07-03 |
|
| 10 |
Moore Stephen Michael |
SVP and Chief Legal Officer |
92,325 |
2026-03-17 |
|
| 11 |
Bowman A Blaine |
Director |
50,000 |
2025-05-20 |
|
| 12 |
Bloom Olivia Kyusuk |
Director |
50,000 |
2025-05-20 |
|
| 13 |
Shoff Lonnie |
Director |
50,000 |
2025-05-20 |
|
| 14 |
Myers Woodrow A Jr |
Director |
50,000 |
2025-05-20 |
|
| 15 |
Eastham Karin |
Director |
50,000 |
2025-05-20 |
|
| 16 |
Widder Kenneth J |
Director |
50,000 |
2025-05-20 |
|
| 17 |
Colowick Alan |
Director |
40,000 |
2023-05-19 |
|
| 18 |
Ludlum Ken |
Director |
15,035 |
2022-05-19 |
|
| 19 |
Balthrop Patrick J |
Director |
14,000 |
2020-05-19 |
|
| 20 |
Ricci Paul |
Director |
14,000 |
2020-05-19 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-15 |
Moore Stephen Michael |
SVP and Chief Legal Officer |
RSU Award |
28,125 |
- |
- |
| 2026-03-15 |
Chen Richard |
President and CMO |
RSU Award |
46,875 |
- |
- |
| 2026-03-15 |
Hall Christopher M |
Chief Executive Officer |
RSU Award |
87,500 |
- |
- |
| 2026-03-15 |
Tachibana Aaron |
CFO and COO |
RSU Award |
34,375 |
- |
- |
| 2026-02-23 |
Moore Stephen Michael |
SVP and Chief Legal Officer |
RSU Award |
8,333 |
$1.61 |
$13.42K |
| 2026-02-23 |
Chen Richard |
Chief Medical Officer and EVP |
RSU Award |
15,000 |
$1.61 |
$24.15K |
| 2026-02-23 |
Hall Christopher M |
President and CEO |
RSU Award |
33,333 |
$1.61 |
$53.67K |
| 2026-02-23 |
Tachibana Aaron |
CFO and COO |
RSU Award |
15,000 |
$1.61 |
$24.15K |
| 2025-12-22 |
Tempus Ai, Inc. |
10 Percent Owner |
Informative Buy |
28,000 |
$8.93 |
$250.04K |
| 2025-12-19 |
Tempus Ai, Inc. |
10 Percent Owner |
Informative Buy |
29,641 |
$8.39 |
$248.69K |
| 2025-12-18 |
Tempus Ai, Inc. |
10 Percent Owner |
Informative Buy |
31,430 |
$7.91 |
$248.61K |
| 2025-12-17 |
Tempus Ai, Inc. |
10 Percent Owner |
Informative Buy |
31,650 |
$7.86 |
$248.77K |
| 2025-11-25 |
Tempus Ai, Inc. |
10 Percent Owner |
Informative Buy |
9,712 |
$10.08 |
$97.9K |
| 2025-11-24 |
Tempus Ai, Inc. |
10 Percent Owner |
Informative Buy |
25,225 |
$9.87 |
$248.97K |
| 2025-11-21 |
Tempus Ai, Inc. |
10 Percent Owner |
Informative Buy |
9,900 |
$8.84 |
$87.52K |
| 2025-11-20 |
Tempus Ai, Inc. |
10 Percent Owner |
Informative Buy |
28,827 |
$8.63 |
$248.78K |
| 2025-11-19 |
Tempus Ai, Inc. |
10 Percent Owner |
Informative Buy |
30,645 |
$8.12 |
$248.84K |
| 2025-11-18 |
Tempus Ai, Inc. |
10 Percent Owner |
Informative Buy |
64,750 |
$7.67 |
$496.63K |
| 2026-01-22 |
Tachibana Aaron |
CFO and COO |
Option Exercise (Sell) |
1,201 |
$9.16 |
$11K |
| 2025-11-25 |
Tachibana Aaron |
CFO and COO |
Option Exercise (Sell) |
103,668 |
$9.16 |
$949.6K |
| 2025-11-03 |
Hall Christopher M |
President and CEO |
Informative Sell |
29,612 |
$8.99 |
$266.21K |
| 2025-07-28 |
Chen Richard |
Chief Medical Officer and EVP |
Informative Sell |
452 |
$6.57 |
$2.97K |
| 2025-07-28 |
Tachibana Aaron |
CFO and COO |
Informative Sell |
641 |
$6.57 |
$4.21K |
| 2025-05-16 |
Moore Stephen Michael |
SVP and Chief Legal Officer |
Informative Sell |
1,675 |
$4.95 |
$8.29K |
| 2025-05-16 |
Chen Richard |
Chief Medical Officer and EVP |
Informative Sell |
910 |
$4.95 |
$4.5K |
