PERSONALIS INC PSNL
COM · Common Stock · CUSIP 71535D106
Company in Menlo Park, United States
- SectorHealth care
- IndustryServices-Medical Laboratories
- HeadquartersFremont, CA
- Founded2011
- Websitepersonalis.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($2.4m this quarter). Holder counts are more reliable. Shares outstanding: 88.3m as of 2025-04-29, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $3.51. Options: 5 managers hold calls ($461.6k notional), 5 hold puts ($404.3k).
Trends to Q1 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 81 |
| Q4 2022 | 81 |
| Q1 2023 | 64 |
| Q2 2023 | 67 |
| Q3 2023 | 64 |
| Q4 2023 | 70 |
| Q1 2024 | 72 |
| Q2 2024 | 70 |
| Q3 2024 | 84 |
| Q4 2024 | 108 |
| Q1 2025 | 105 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q2 2023 | 25 | 31 |
| Q3 2023 | 18 | 34 |
| Q4 2023 | 32 | 26 |
| Q1 2024 | 35 | 29 |
| Q2 2024 | 18 | 39 |
| Q3 2024 | 40 | 36 |
| Q4 2024 | 48 | 42 |
| Q1 2025 | 62 | 46 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q2 2024 | $34.5k | $0 | 0.00 |
| Q3 2024 | $182.6k | $459.5k | 2.52 |
| Q4 2024 | $481.9k | $510.6k | 1.06 |
| Q1 2025 | $461.6k | $404.3k | 0.88 |
Biggest buyers
| Aberdeen Group plc | Added | +1.4m |
| MARSHALL WACE, LLP | Added | +626.3k |
| KENNEDY CAPITAL MANAGEMENT LLC | New | +604.3k |
| ARK Investment Management LLC | Added | +412.8k |
| MORGAN STANLEY | Added | +310.2k |
| DIMENSIONAL FUND ADVISORS LP | Added | +224.9k |
| HRT FINANCIAL LP | New | +177.1k |
| AIGH Capital Management LLC | Added | +169.9k |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | Added | +116.5k |
| RENAISSANCE TECHNOLOGIES LLC | Added | +113.1k |
Biggest sellers
| MILLENNIUM MANAGEMENT LLC | Reduced | -445.8k |
| VANGUARD GROUP INC | Reduced | -444.3k |
| JANE STREET GROUP, LLC | Reduced | -154.3k |
| 683 Capital Management, LLC | Sold out | -134.0k |
| ACADIAN ASSET MANAGEMENT LLC | Reduced | -105.4k |
| Connor, Clark & Lunn Investment Management Ltd. | Sold out | -103.6k |
| Jump Financial, LLC | Sold out | -101.7k |
| CITADEL ADVISORS LLC | Sold out | -99.0k |
| Balyasny Asset Management L.P. | Sold out | -60.1k |
| Sumitomo Mitsui Trust Group, Inc. | Reduced | -57.3k |
Biggest calls
| SIMPLEX TRADING, LLC | Added | $278.0k79.4k shares |
| GROUP ONE TRADING LLC | Added | $99.3k28.3k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | New | $56.5k16.1k shares |
| CITADEL ADVISORS LLC | Reduced | $27.7k7.9k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| CITADEL ADVISORS LLC | Reduced | $193.1k55.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $151.6k43.2k shares |
| GROUP ONE TRADING LLC | Added | $31.6k9.0k shares |
| SIMPLEX TRADING, LLC | Added | $28.0k8.0k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| Merck & Co., Inc. 13G · passive investor new · filed 2024-12-23 | 16.5% |
Tempus AI, Inc.
13D · may seek influence
-1.9 pts · filed 2026-07-21
Stated purposeMerger Agreement Following conclusion of confidential preliminary discussions between the Issuer and Tempus, and in response to the Issuer's request for Tempus to submit a proposal, on July 19, 2026, Tempus submitted a non-binding proposal to acquire all of the outstanding Common Stock of the Issuer. On July 20, 2026, Tempus entered into an Agreement and Plan of Merger (the "Merger Agreement") with the Issuer, Aviary Development, Inc., a Delaware corporation and a direct, wholly owned subsidiary of Tempus ("Merger Sub I") and Toucan Development, LLC, a Nevada limited liability company and a direct, wholly owned subsidiary of Tempus ("Merger Sub II" and, together with Merger Sub I, the "Merger Subs"). Pursuant to the Merger Agreement, and upon the terms and subject to the conditions therei… Full filing |
12.6% |
| ARK Investment Management LLC 13G · institution -1.4 pts · filed 2025-05-14 | 8.1% |
| BlackRock, Inc. 13G · institution +2.4 pts · filed 2026-07-29 | 5.9% |
| AMERIPRISE FINANCIAL INC 13G · institution -1.3 pts · filed 2026-08-14 | 5.8% |
Fell to 5% or below in the last year: KEYWELL BRADLEY A (3.5%, 2026-10-28), Deep Track Capital, LP (3.8%, 2026-08-14), Lightspeed Venture Partners Select IV, L.P. (2.0%, 2026-06-10), T. Rowe Price Investment Management, Inc. (4.5%, 2026-04-08), HIRSCHMAN ORIN (3.8%, 2026-01-29), Red Sky Ventures LLC (4.7%, 2025-11-13)
Insider purchases and sales in Q1 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q2 2023 | 0 | — | 3 | $47.3k | — |
| Q3 2023 | 0 | — | 2 | $2.6k | — |
| Q4 2023 | 0 | — | 4 | $42.2k | — |
| Q1 2024 | 1 | $16.7k | 2 | $1.7k | — |
| Q2 2024 | 0 | — | 3 | $29.5k | — |
| Q3 2024 | 0 | — | 2 | $3.8k | — |
| Q4 2024 | 0 | — | 4 | $207.6k | — |
| Q1 2025 | 0 | — | 2 | $7.1k | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-01-28 | Tachibana Aaron CFO AND COO | Sold | $4.1k708 shares |
| 2025-01-28 | Chen Richard CHIEF MEDICAL OFFICER AND EVP | Sold | $3.0k519 shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q1 2025
| Manager | Shares | Change |
|---|---|---|
| Merck & Co., Inc. 33.18% of their portfolio | 14.0m $49.3m | Unchanged |
| LIGHTSPEED MANAGEMENT COMPANY, L.L.C. 20.99% of their portfolio | 8.2m $28.6m | Unchanged |
| ARK Investment Management LLC 0.25% of their portfolio | 7.2m $25.2m | Added +412.8k |
| AIGH Capital Management LLC 7.23% of their portfolio | 4.0m $13.9m | Added +169.9k |
| BlackRock, Inc. 0.00% of their portfolio | 3.0m $10.5m | Added +43.4k |
| Aberdeen Group plc 0.01% of their portfolio | 1.7m $6.0m | Added +1.4m |
| VANGUARD GROUP INC 0.00% of their portfolio | 1.3m $4.5m | Reduced -444.3k |
| Blue Water Life Science Advisors, LP 4.09% of their portfolio | 1.2m $4.1m | Added +42.5k |
| RENAISSANCE TECHNOLOGIES LLC 0.01% of their portfolio | 1.0m $3.6m | Added +113.1k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.01% of their portfolio | 949.8k $3.3m | Added +76.7k |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 871.5k $3.1m | Reduced -445.8k |
| MARSHALL WACE, LLP 0.00% of their portfolio | 696.3k $2.4m | Added +626.3k |
| Sumitomo Mitsui Trust Group, Inc. 0.00% of their portfolio | 676.0k $2.4m | Reduced -57.3k |
| Amova Asset Management Americas, Inc. 0.03% of their portfolio | 676.0k $2.4m | Reduced -57.3k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 635.0k $2.2m | Added +224.9k |
| KENNEDY CAPITAL MANAGEMENT LLC 0.05% of their portfolio | 604.3k $2.1m | New |
| MORGAN STANLEY 0.00% of their portfolio | 560.0k $2.0m | Added +310.2k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 514.2k $1.8m | Added +16.1k |
| STATE OF MICHIGAN RETIREMENT SYSTEM 0.01% of their portfolio | 493.8k $1.7m | Unchanged |
| Wellington Shields Capital Management, LLC 0.27% of their portfolio | 426.3k $1.5m | Reduced -4.8k |
| Qube Research & Technologies Ltd 0.00% of their portfolio | 402.3k $1.4m | Added +3.8k |
| JACOBS LEVY EQUITY MANAGEMENT, INC 0.01% of their portfolio | 367.0k $1.3m | Reduced -21.6k |
| ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio | 310.5k $1.1m | Reduced -105.4k |
| Wellington Shields & Co., LLC 0.32% of their portfolio | 292.5k $1.0m | Unchanged |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 284.4k $998.3k | Added +101.7k |
| HOWLAND CAPITAL MANAGEMENT LLC 0.04% of their portfolio | 282.8k $992.7k | Added +20.2k |
| PERKINS CAPITAL MANAGEMENT INC 0.95% of their portfolio | 257.3k $903.1k | Unchanged |
| Bruce & Co., Inc. 0.28% of their portfolio | 253.0k $888.0k | Unchanged |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 247.0k $867.0k | Reduced -154.3k |
| Squarepoint Ops LLC 0.00% of their portfolio | 202.5k $710.7k | Added +110.8k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 201.0k $705.5k | Reduced -11.5k |
| STATE STREET CORP 0.00% of their portfolio | 195.3k $685.4k | Reduced -3.1k |
| HRT FINANCIAL LP 0.00% of their portfolio | 177.1k $621.0k | New |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC 0.01% of their portfolio | 154.1k $541.1k | Added +116.5k |
| LPL Financial LLC 0.00% of their portfolio | 147.9k $519.2k | Added +4.0k |
| GSA CAPITAL PARTNERS LLP 0.05% of their portfolio | 144.7k $508.0k | Added +58.3k |
| Williams Jones Wealth Management, LLC. 0.01% of their portfolio | 134.1k $470.6k | Unchanged |
| Trexquant Investment LP 0.01% of their portfolio | 123.0k $431.6k | Added +100.8k |
| Schonfeld Strategic Advisors LLC 0.00% of their portfolio | 114.5k $402.0k | Added +100.2k |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 110.2k $386.8k | Reduced -35.5k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 97.0k $340.6k | Added +8.0k |
| BARCLAYS PLC 0.00% of their portfolio | 86.0k $301.8k | Reduced -23.4k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 85.0k $299.0k | Reduced -10.0k |
| EntryPoint Capital, LLC 0.13% of their portfolio | 83.6k $293.5k | Added +36.1k |
| XTX Topco Ltd 0.01% of their portfolio | 82.7k $290.2k | Added +49.2k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 78.3k $275.0k | Added +2.4k |
| Dynamic Technology Lab Private Ltd 0.04% of their portfolio | 76.7k $269.0k | Added +33.0k |
| OMERS ADMINISTRATION Corp 0.00% of their portfolio | 75.2k $264.0k | Reduced -6.2k |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 67.4k $236.5k | Added +17.1k |
| Graham Capital Management, L.P. 0.01% of their portfolio | 58.1k $203.9k | New |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd 0.02% of their portfolio | 55.6k $195.1k | Added +30.4k |
| Centiva Capital, LP 0.01% of their portfolio | 50.5k $177.3k | Added +10.2k |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 47.0k $165.1k | Added +46.9k |
| UBS Group AG 0.00% of their portfolio | 46.3k $162.6k | Added +4.4k |
| Verition Fund Management LLC 0.00% of their portfolio | 44.9k $157.7k | New |
| Jain Global LLC 0.00% of their portfolio | 43.8k $153.7k | New |
| STIFEL FINANCIAL CORP 0.00% of their portfolio | 40.0k $140.4k | Added +15.0k |
| Jefferies Financial Group Inc. 0.00% of their portfolio | 39.6k $139.0k | Unchanged |
| HSBC HOLDINGS PLC 0.00% of their portfolio | 39.1k $136.7k | Reduced -1.8k |
| Green Alpha Advisors, LLC 0.14% of their portfolio | 37.3k $130.9k | Reduced -1.7k |
| ExodusPoint Capital Management, LP 0.00% of their portfolio | 34.2k $120.0k | Added +11.1k |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 30.6k $107.4k | Reduced -55.0k |
| Quantessence Capital LLC 0.03% of their portfolio | 28.5k $100.0k | New |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 25.9k $91.0k | Reduced -8.5k |
| Engineers Gate Manager LP 0.00% of their portfolio | 24.9k $87.5k | Added +7.6k |
| LMR Partners LLP 0.00% of their portfolio | 24.2k $85.1k | New |
| Massar Capital Management, LP 0.10% of their portfolio | 24.0k $84.1k | New |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 22.9k $80.5k | Added +2 |
| IEQ CAPITAL, LLC 0.00% of their portfolio | 22.0k $77.2k | Unchanged |
| Brevan Howard Capital Management LP 0.00% of their portfolio | 21.9k $77.0k | New |
| Susquehanna Portfolio Strategies, LLC 0.03% of their portfolio | 21.4k $75.2k | New |
| TWO SIGMA ADVISERS, LP 0.00% of their portfolio | 20.8k $73.0k | Reduced -13.5k |
| SIH Partners, LLLP 0.01% of their portfolio | 20.0k $70.1k | New |
| FRANKLIN RESOURCES INC 0.00% of their portfolio | 18.5k $64.9k | New |
| Diametric Capital, LP 0.08% of their portfolio | 18.4k $64.7k | New |
| PRUDENTIAL FINANCIAL INC 0.00% of their portfolio | 18.4k $64.4k | Unchanged |
| China Universal Asset Management Co., Ltd. 0.01% of their portfolio | 17.7k $62.1k | Added +2.7k |
| Parallel Advisors, LLC 0.00% of their portfolio | 16.5k $59.8k | Unchanged |
| WEXFORD CAPITAL LP 0.01% of their portfolio | 16.3k $57.3k | New |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 15.4k $54.2k | Added +875 |
| Invesco Ltd. 0.00% of their portfolio | 13.9k $48.7k | Reduced -321 |
| Focus Partners Wealth 0.00% of their portfolio | 13.5k $47.5k | Unchanged |
| Prime Capital Investment Advisors, LLC 0.00% of their portfolio | 11.5k $40.3k | Reduced -304 |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 10.6k $37.2k | Reduced -500 |
| GROUP ONE TRADING LLC 0.00% of their portfolio | 6.1k $21.4k | Added +3.8k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 4.9k $17.1k | Reduced -984 |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 3.7k $13.0k | Unchanged |
| Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio | 3.0k $10.7k | Added +599 |
| OSAIC HOLDINGS, INC. 0.00% of their portfolio | 2.4k $8.5k | Added +475 |
| Zurcher Kantonalbank (Zurich Cantonalbank) 0.00% of their portfolio | 2.0k $7.1k | Added +1.8k |
| Larson Financial Group LLC 0.00% of their portfolio | 1.9k $6.7k | New |
| GF FUND MANAGEMENT CO. LTD. 0.00% of their portfolio | 1.8k $6.3k | Added +326 |
| CITIGROUP INC 0.00% of their portfolio | 1.3k $4.5k | Reduced -46.9k |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 1.3k $4.5k | First filing |
| US BANCORP \DE\ 0.00% of their portfolio | 1.0k $3.5k | Unchanged |
| Caitong International Asset Management Co., Ltd 0.00% of their portfolio | 590 $2.1k | Reduced -98 |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 522 $1.8k | Unchanged |
| Asset Dedication, LLC 0.00% of their portfolio | 400 $1.4k | Added +200 |
| Daiwa Securities Group Inc. 0.00% of their portfolio | 400 $1.0k | New |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 209 $734 | Added +131 |