Comparable stake leader
Merck & Co., Inc.
SEC ownership of Personalis, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001527753.
Disclosed value leader
Tempus AI, Inc.
Comparable rows
50/50
Latest evidence
19 Jul 2026
- Public ticker
- PSNL on Nasdaq
- Parsed ownership sources
-
13F, 13D/G, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Merck & Co., Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Merck & Co., Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
19 Jul 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001527753
- Issuer location
- Fremont, CA
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Personalis, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Merck & Co., Inc.
Disclosed value leader
Tempus AI, Inc.
Comparable rows
50/50
Latest evidence
19 Jul 2026
13F
13D/G
3/4/5
Lead comparable stake: 16%
13D/G row: Merck & Co., Inc.
Showing 1-8 of 50 holder rows.
Quick read
Merck & Co., Inc. leads the comparable SEC ownership view at 16%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Merck & Co., Inc.'s linked filing trail.
Comparable ownership
Top 5
Merck & Co., Inc.
16%
Tempus AI, Inc.
13%
ARK Investment Management LLC
8.1%
AMERIPRISE FINANCIAL INC
7.1%
BlackRock, Inc.
5.9%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Merck & Co., Inc. |
13F
13D/G
3/4/5
Company · 10%+ Owner
|
16%
from 13D/G
|
$89,466,287
14,044,943 shares
|
— | 31 Mar 2026 |
| Tempus AI, Inc. |
13D/G
3/4/5
Eric Lefkofsky · 10%+ Owner
|
13%
|
$176,733,498
13,189,067 shares
|
+$4,291,578 | 19 Jul 2026 |
| ARK Investment Management LLC |
13F
13D/G
Company
|
8.1%
from 13D/G
|
$50,603,993
7,944,112 shares
|
— | 31 Mar 2026 |
| AMERIPRISE FINANCIAL INC |
13D/G
13F
Company
|
7.1%
|
$53,880,884
6,287,151 shares
|
$0 | 31 Dec 2025 |
| BlackRock, Inc. |
13D/G
13F
Company
|
5.9%
|
$82,674,369
6,169,729 shares
|
+$43,075,091 | 30 Jun 2026 |
| Deep Track Capital, LP |
13D/G
13F
Company
|
5.5%
|
$36,349,556
5,760,627 shares
|
$0 | 05 May 2026 |
| T. Rowe Price Investment Management, Inc. |
13D/G
13F
Company
|
4.5%
|
$30,312,846
4,758,091 shares
|
-$38,366,225 | 31 Mar 2026 |
| Orin Hirschman |
13D/G
|
3.8%
|
$27,205,633
3,416,720 shares
|
-$6,982,468 | 31 Dec 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$5,773,312.
Buys
$2,739,181
Insiders: 1
Sells
$8,512,493
Insiders: 3
Net
-$5,773,312
Shares: -349,246
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 320,267
Shares: 669,513
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 535,032 | $0 | $7,114,929 | -$7,114,929 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 320,267 | 104,869 | $2,739,181 | $1,131,353 | +$1,607,829 |
| 9-12 | 0 | 29,612 | $0 | $266,212 | -$266,212 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-18 of 18 reporting-owner rows connected to Personalis, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
18
Largest Forms 3/4/5 holder
Tempus AI, Inc.
Net 12M change
-$5,773,312
Latest report
15 Jul 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Tempus AI, Inc. | 10%+ Owner | $116,438,868 | +$2,739,181 | +2.4% | Filing P/S | 18 Nov 2025 |
| Merck & Co., Inc. | 10%+ Owner | $53,651,682 | Mixed | 19 Dec 2024 | ||
| Christopher M. Hall | Chief Executive Officer, Director | $3,558,668 | -$4,191,212 | -54% | Filing P/S | 09 Jul 2026 |
| Lightspeed Venture Partners Select IV, L.P. | Affiliate of 10% Owner | $3,070,816 | Mixed | 02 Mar 2022 | ||
| Aaron Tachibana | Cfo And Coo | $2,783,662 | -$2,806,281 | -50% | Filing P/S | 29 Jun 2026 |
| Richard Chen | President and CMO | $2,634,282 | -$1,515,000 | -37% | Filing P/S | 15 Jul 2026 |
| John Stephen West | President and CEO, Director | $914,993 | Mixed | 14 Dec 2022 | ||
| Stephen Michael Moore | SVP and Chief Legal Officer | $830,925 | Mixed | 15 Mar 2026 | ||
| Lonnie Shoff | Director | $236,900 | Mixed | 12 May 2026 | ||
| Woodrow A. Myers Jr. | Director | $206,171 | Mixed | 12 May 2026 | ||
| Eric Paul Lefkofsky | 10%+ Owner | $193,500 | Mixed | 28 Nov 2023 | ||
| Olivia Kyusuk Bloom | Director | $173,678 | Mixed | 12 May 2026 | ||
| Ken Ludlum | Director | $166,854 | Mixed | 17 May 2022 | ||
| A. Blaine Bowman | Director | $125,845 | Mixed | 12 May 2026 | ||
| Karin Eastham | Director | $114,189 | Mixed | 12 May 2026 | ||
| WIDDER KENNETH J | Director | $39,812 | Mixed | 12 May 2026 | ||
| Jonathan MacQuitty | Director | $4,022 | Mixed | 14 May 2021 | ||
| Alan Colowick | Director | Mixed | 17 May 2023 |
Recent insider transactions for Personalis, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Richard Chen | PSNL | Common Stock | Sale | -36.5% | $1,515,000 | $15.15 | -100,000 | 173,880 | 15 Jul 2026 | Direct |
| Richard Chen | PSNL | Common Stock | Options Exercise | 57.5% | 100,000 | 273,880 | 15 Jul 2026 | Direct | ||
| Richard Chen | PSNL | Stock Option (right to buy) | Options Exercise | -100% | -100,000 | 0 | 15 Jul 2026 | Direct | ||
| Christopher M. Hall | PSNL | Common Stock | Sale | -29.8% | $1,508,000 | $15.08 | -100,000 | 235,986 | 09 Jul 2026 | Direct |
| Christopher M. Hall | PSNL | Common Stock | Options Exercise | 42.4% | 100,000 | 335,986 | 09 Jul 2026 | Direct | ||
| Christopher M. Hall | PSNL | Stock Option (right to buy) | Options Exercise | -100% | -100,000 | 0 | 09 Jul 2026 | Direct | ||
| Aaron Tachibana | PSNL | Common Stock | Sale | -2.44% | $69,748 | $14.00 | -4,982 | 198,833 | 29 Jun 2026 | Direct |
| Aaron Tachibana | PSNL | Common Stock | Options Exercise | 2.51% | 4,982 | 203,815 | 29 Jun 2026 | Direct | ||
| Aaron Tachibana | PSNL | Stock Option (right to buy) | Options Exercise | -66.7% | -4,982 | 2,489 | 29 Jun 2026 | Direct | ||
| Aaron Tachibana | PSNL | Common Stock | Sale | -20.5% | $675,488 | $13.18 | -51,251 | 198,833 | 26 Jun 2026 | Direct |
| Aaron Tachibana | PSNL | Common Stock | Options Exercise | 25.8% | 51,251 | 250,084 | 26 Jun 2026 | Direct | ||
| Aaron Tachibana | PSNL | Stock Option (right to buy) | Options Exercise | -100% | -51,251 | 0 | 26 Jun 2026 | Direct | ||
| Christopher M. Hall | PSNL | Common Stock | Sale | -29.8% | $1,315,000 | $13.15 | -100,000 | 235,986 | 26 Jun 2026 | Direct |
| Christopher M. Hall | PSNL | Common Stock | Options Exercise | 42.4% | 100,000 | 335,986 | 26 Jun 2026 | Direct | ||
| Christopher M. Hall | PSNL | Stock Option (right to buy) | Options Exercise | -33.3% | -100,000 | 200,000 | 26 Jun 2026 | Direct | ||
| Aaron Tachibana | PSNL | Common Stock | Sale | -16.8% | $480,400 | $12.01 | -40,000 | 198,833 | 04 Jun 2026 | Direct |
| Aaron Tachibana | PSNL | Common Stock | Options Exercise | 20.1% | 40,000 | 238,833 | 04 Jun 2026 | Direct | ||
| Aaron Tachibana | PSNL | Stock Option (right to buy) | Options Exercise | -58.1% | -40,000 | 28,832 | 04 Jun 2026 | Direct | ||
| Christopher M. Hall | PSNL | Common Stock | Sale | -25.3% | $882,603 | $11.02 | -80,091 | 235,986 | 29 May 2026 | Direct |
| Christopher M. Hall | PSNL | Common Stock | Options Exercise | 33.9% | 80,091 | 316,077 | 29 May 2026 | Direct | ||
| Christopher M. Hall | PSNL | Stock Option (right to buy) | Options Exercise | -21.1% | -80,091 | 300,000 | 29 May 2026 | Direct | ||
| Aaron Tachibana | PSNL | Common Stock | Sale | -16.3% | $449,292 | $11.58 | -38,799 | 198,833 | 29 May 2026 | Direct |
| Aaron Tachibana | PSNL | Common Stock | Options Exercise | 19.5% | 38,799 | 237,632 | 29 May 2026 | Direct | ||
| Aaron Tachibana | PSNL | Stock Option (right to buy) | Options Exercise | -36% | -38,799 | 68,832 | 29 May 2026 | Direct | ||
| Christopher M. Hall | PSNL | Common Stock | Sale | -7.78% | $219,397 | $11.02 | -19,909 | 235,986 | 28 May 2026 | Direct |
| Christopher M. Hall | PSNL | Common Stock | Options Exercise | 8.44% | 19,909 | 255,895 | 28 May 2026 | Direct | ||
| Christopher M. Hall | PSNL | Stock Option (right to buy) | Options Exercise | -4.98% | -19,909 | 380,091 | 28 May 2026 | Direct | ||
| Karin Eastham | PSNL | Common Stock | Award | 46.3% | 6,250 | 19,756 | 12 May 2026 | Direct | ||
| A. Blaine Bowman | PSNL | Common Stock | Award | 46.3% | 6,250 | 19,756 | 12 May 2026 | Direct | ||
| A. Blaine Bowman | PSNL | Stock Option (right to buy) | Award | 37,500 | 37,500 | 12 May 2026 | Direct | |||
| Widder Kenneth J | PSNL | Common Stock | Award | 6,250 | 6,250 | 12 May 2026 | Direct | |||
| Widder Kenneth J | PSNL | Stock Option (right to buy) | Award | 37,500 | 37,500 | 12 May 2026 | Direct | |||
| Lonnie Shoff | PSNL | Common Stock | Award | 20.2% | 6,250 | 37,190 | 12 May 2026 | Direct | ||
| Lonnie Shoff | PSNL | Stock Option (right to buy) | Award | 37,500 | 37,500 | 12 May 2026 | Direct | |||
| Olivia Kyusuk Bloom | PSNL | Common Stock | Award | 29.7% | 6,250 | 27,265 | 12 May 2026 | Direct | ||
| Olivia Kyusuk Bloom | PSNL | Stock Option (right to buy) | Award | 37,500 | 37,500 | 12 May 2026 | Direct | |||
| Woodrow A. Myers Jr. | PSNL | Common Stock | Award | 23.9% | 6,250 | 32,366 | 12 May 2026 | Direct | ||
| Woodrow A. Myers Jr. | PSNL | Stock Option (right to buy) | Award | 37,500 | 37,500 | 12 May 2026 | Direct | |||
| Aaron Tachibana | PSNL | Common Stock | Award | 20.9% | 34,375 | 198,833 | 15 Mar 2026 | Direct | ||
| Aaron Tachibana | PSNL | Stock Option (right to buy) | Award | 206,250 | 206,250 | 15 Mar 2026 | Direct | |||
| Stephen Michael Moore | PSNL | Common Stock | Award | 43.8% | 28,125 | 92,325 | 15 Mar 2026 | Direct | ||
| Stephen Michael Moore | PSNL | Stock Option (right to buy) | Award | 168,750 | 168,750 | 15 Mar 2026 | Direct | |||
| Christopher M. Hall | PSNL | Common Stock | Award | 58.9% | 87,500 | 235,986 | 15 Mar 2026 | Direct | ||
| Christopher M. Hall | PSNL | Stock Option (right to buy) | Award | 525,000 | 525,000 | 15 Mar 2026 | Direct | |||
| Richard Chen | PSNL | Common Stock | Award | 36.9% | 46,875 | 173,880 | 15 Mar 2026 | Direct | ||
| Richard Chen | PSNL | Stock Option (right to buy) | Award | 281,250 | 281,250 | 15 Mar 2026 | Direct | |||
| Aaron Tachibana | PSNL | Stock Option (right to buy) | Award | 15,000 | 15,000 | 23 Feb 2026 | Direct | |||
| Richard Chen | PSNL | Stock Option (right to buy) | Award | 15,000 | 15,000 | 23 Feb 2026 | Direct | |||
| Stephen Michael Moore | PSNL | Stock Option (right to buy) | Award | 8,333 | 8,333 | 23 Feb 2026 | Direct | |||
| Christopher M. Hall | PSNL | Stock Option (right to buy) | Award | 33,333 | 33,333 | 23 Feb 2026 | Direct |
* marks a reported price that did not pass the local price check.