NASDAQ: PSNL
Personalis Inc Stock Ownership - Who owns Personalis?

Insider buying vs selling

Have Personalis Inc insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
Aaron TachibanaCFO AND COO2026-01-221,201$9.16
$11.00kBuy
Aaron TachibanaCFO AND COO2026-01-221,201$11.50
$13.81kSell
Tempus Ai Inc10% Owner2025-12-2228,000$8.93
$250.04kBuy
Tempus Ai Inc10% Owner2025-12-1929,641$8.39
$248.69kBuy
Tempus Ai Inc10% Owner2025-12-1831,430$7.91
$248.61kBuy
Tempus Ai Inc10% Owner2025-12-1731,650$7.86
$248.77kBuy
Tempus Ai Inc10% Owner2025-11-259,712$10.08
$97.90kBuy
Tempus Ai Inc10% Owner2025-11-2513,888$11.00
$152.77kBuy
Aaron TachibanaCFO AND COO2025-11-25103,668$9.16
$949.60kBuy
Aaron TachibanaCFO AND COO2025-11-25103,668$10.78
$1.12MSell

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Net Insider Buy/Sell (L12M) Ownership

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PSNL Shareholders

What type of owners hold Personalis Inc stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Merck Co Inc13.42%14,044,943$89.04MInsider
Merck Co Inc13.42%14,044,943$89.04MInstitution
Tempus Ai Inc12.46%13,039,067$82.67MInsider
T Rowe Price Investment Management Inc10.30%10,780,290$68.35MInstitution
Lightspeed Management Company LLC7.80%8,160,734$51.74MInstitution
Ark Investment Management LLC7.53%7,879,087$49.95MInstitution
Ameriprise Financial Inc6.01%6,287,151$39.86MInstitution
Blackrock Inc5.08%5,319,508$33.73MInstitution
Abingworth LLP3.59%3,753,340$23.80MInsider
Vanguard Group Inc3.11%3,253,797$20.63MInstitution

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PSNL vs Diagnostic & Research Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
PSNL68.86%31.14%Net BuyingNet Buying
CSTL86.02%13.98%Net SellingNet Selling
FLGT57.16%41.96%Net SellingNet Selling
CDNA77.00%23.00%Net SellingNet Selling
OPK20.62%79.38%Net BuyingNet Buying

Personalis Stock Ownership FAQ

Who owns Personalis?

Personalis (NASDAQ: PSNL) is owned by 77.41% institutional shareholders, 35.00% Personalis insiders, and 0.00% retail investors. Merck Co Inc is the largest individual Personalis shareholder, owning 14.04M shares representing 13.42% of the company. Merck Co Inc's Personalis shares are currently valued at $89.04M.

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