Personalis

PSNL · NASDAQ

$15.94+$0.06 (+0.38%)TodayMarket closed · Oct 20, 7:30 PM ET

Prev close $15.88

Who owns PSNL

Largest institutional holders, from their latest 13F filings

The 10 largest institutions hold 60.1% of PSNL’s shares.

Merck & Co Inc13.2%
Tempus AI Inc12.2%
ARK Investment Management LLC7.7%
Lightspeed Venture Partners5.7%
Next 6 largest institutions21.2%
All other shareholders39.9%

Top institutional holders of PSNL
Holder	Shares	% of shares	Change, last filing	Filed
Merck & Co Inc	14.04M	13.16%	+0	Jun 30, 2026
Tempus AI Inc	13.04M	12.21%	+0	Jul 19, 2026
ARK Investment Management LLC	8.27M	7.75%	+327.23K	Jun 30, 2026
Lightspeed Venture Partners	6.10M	5.72%	−2.06M	Jun 30, 2026
BlackRock Institutional Trust Company, N.A.	5.92M	5.55%	+1.54M	Jun 30, 2026
Deep Track Capital LP	4.00M	3.75%	−1.76M	Jun 30, 2026
abrdn Inc.	3.75M	3.51%	+258.98K	Jun 30, 2026
Columbia Threadneedle Investments (US)	3.11M	2.91%	+272.87K	Jun 30, 2026
Vanguard Capital Management, LLC	3.01M	2.82%	+141.69K	Jun 30, 2026
Columbia Threadneedle Investments (UK)	2.89M	2.71%	−1.73M	Jun 30, 2026

Largest mutual fund holders

Top mutual fund holders of PSNL
Holder	Shares	% of shares	Change, last filing	Filed
ARK Genomic Revolution ETF	6.94M	6.50%	+207.98K	Aug 31, 2026
Vanguard Total Stock Market Index Fund	2.14M	2.01%	+0	Jul 31, 2026
abrdn Healthcare Investors Fund (US)	2.06M	1.93%	+161.68K	Mar 31, 2026
iShares Russell 2000 ETF	1.77M	1.66%	+40.10K	Jul 31, 2026
CT (Lux) American Smaller Companies	1.73M	1.62%	−20.57K	Jul 31, 2026

Insider trades

Form 4 filings by officers, directors and large holders

Over the last 6 months, insiders sold $7.31M (12 trades) of PSNL on the open market, with no buys.

Latest PSNL insider transactions
Insider	Date	Type	Shares	Price	Value
Moore Stephen Michael	Sep 18, 2026	Sale	2.07K	$16.22	$33.54K
Chen Richard	Sep 18, 2026	Sale	4.00K	$16.22	$64.85K
Hall Christopher M	Sep 18, 2026	Sale	7.46K	$16.22	$120.98K
Tachibana Aaron	Sep 18, 2026	Sale	2.93K	$16.22	$47.54K
Chen Richard	Jul 15, 2026	Option exercise	100.00K	—	—
Chen Richard	Jul 15, 2026	Sale	100.00K	$15.15	$1.51M
Chen Richard	Jul 15, 2026	Option exercise	100.00K	$2.44	$244.00K
Hall Christopher M	Jul 9, 2026	Option exercise	33.33K	—	—
Hall Christopher M	Jul 9, 2026	Option exercise	66.67K	—	—
Hall Christopher M	Jul 9, 2026	Sale	100.00K	$15.08	$1.51M

Short interest

Settled Sep 30, 2026

Shares short: 8.43M
Days to cover: 4.33
% of shares outstanding: 7.89%
Average daily volume: 1.95M
Change since last report: +2.0%

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