Personalis Ownership | Who Owns Personalis?

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Personalis Ownership Summary

Personalis is owned by 81.68% institutional investors, 26.15% insiders. Merck is the largest institutional shareholder, holding 15.22% of PSNL shares. ARK Genomic Revolution is the top mutual fund, with 7.36% of its assets in Personalis shares.

PSNL Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Personalis	81.68%	26.15%	-7.83%
Sector	Healthcare Stocks	246.48%	12.12%	-158.60%
Industry	Diagnostics & Research Stocks	87.40%	9.69%	2.92%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Merck	14.04M	15.22%	$89.47M
Lightspeed management	8.16M	8.84%	$51.98M
Ark investment management	7.94M	8.61%	$50.60M
Ameriprise financial	7.59M	8.23%	$48.37M
Blackrock	3.29M	6.50%	$3.85M
Blackrock funding, inc. /de	5.39M	5.84%	$34.33M
Abrdn	3.49M	3.78%	$22.22M
Vanguard group	3.25M	3.67%	$25.90M
Deep track capital, lp	3.00M	3.25%	$19.11M
Aigh capital management	2.90M	3.14%	$18.47M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Merck	14.04M	25.60%	$89.47M
Blue water life science advisors, lp	1.68M	8.56%	$10.68M
Lightspeed management	8.16M	5.26%	$51.98M
Aigh capital management	2.90M	2.52%	$18.47M
Perkins capital management	239.00K	1.43%	$1.52M
Nano cap new millennium growth fund l p	235.00K	1.40%	$1.50M
Casdin capital	1.60M	0.77%	$10.19M
Wellington shields	292.49K	0.47%	$1.86M
Bruce	233.00K	0.42%	$1.48M
Green alpha advisors	66.41K	0.42%	$423.02K

Top Buyers

Holder	Shares	% Assets	Change
Deep track capital, lp	3.00M	0.31%	3.00M
Casdin capital	1.60M	0.77%	1.60M
Ameriprise financial	7.59M	0.01%	1.31M
Jpmorgan chase	575.49K	0.00%	548.77K
Kennedy capital management	2.18M	0.29%	470.92K

Top Sellers

Holder	Shares	% Assets	Change
T. rowe price investment management	-	-	-4.76M
Pfm health sciences, lp	-	-	-870.10K
Portolan capital management	-	-	-736.71K
Marshall wace, llp	-	-	-696.29K
Next century growth investors	-	-	-624.36K

New Positions

Holder	Shares	% Assets	Change	Value
Deep track capital, lp	3.00M	0.31%	3.00M	$19.11M
Casdin capital	1.60M	0.77%	1.60M	$10.19M
Vanguard fiduciary trust	339.51K	0.00%	339.51K	$2.16M
Tudor investment corp et al	209.83K	0.00%	209.83K	$1.34M
Swiss national bank	105.40K	0.00%	105.40K	$671.40K

Sold Out

Holder	Change
Srs capital advisors	-9.00
Mai capital management	-31.00
Western wealth management	-35.00
Rockefeller capital management	-36.00
Signaturefd	-57.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2026	169	14.97%	86,109,195	1.77%	81	1.24%	112	33.33%	35	-7.89%
Mar 31, 2026	61	-53.44%	16,545,494	-79.57%	17	0.21%	31	-52.31%	18	-55.00%
Dec 31, 2025	91	-19.47%	35,625,946	-45.03%	40	0.75%	49	-9.26%	28	-17.65%
Sep 30, 2025	109	0.93%	64,542,322	6.76%	72	1.56%	52	-26.76%	32	33.33%
Jun 30, 2025	107	0.94%	60,437,524	85.26%	68	4.91%	69	13.11%	25	-10.71%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
ARK Genomic Revolution	7.86M	7.36%	300.51K
ARK Genomic Revolution ETF	6.66M	6.23%	16.28K
Vanguard Total Stock Mkt Idx Inv	2.14M	2.05%	-47.30K
abrdn Healthcare Investors	2.17M	2.04%	-
Vanguard Morn Total Stk Mkt Idx Investor	2.14M	2.01%	-47.30K
Vanguard MStar Total Stk Mkt Idx Invest	2.14M	2.01%	-
iShares Russell 2000 ETF	1.88M	1.76%	-21.63K
Nikko Gbl All Biological Genome Eq MF	932.69K	1.41%	-150.91K
Vanguard US Total Market Shares ETF	1.21M	1.37%	-
T. Rowe Price Small-Cap Stock	1.33M	1.27%	-1.60M

Recent Insider Transactions

Date	Name	Role	Activity	Value
Sep 18, 2026	Moore Stephen Michael	SVP and Chief Legal Officer	Sell	$33.54K
Sep 18, 2026	Chen Richard	President and CMO	Sell	$64.85K
Sep 18, 2026	Hall Christopher M	Chief Executive Officer	Sell	$120.98K
Sep 18, 2026	Tachibana Aaron	CFO AND COO	Sell	$47.54K
Jul 15, 2026	Chen Richard	President and CMO	Sell	$1.51M

Insider Transactions Trends

Date	Buy	Sell
2026 Q3	-	2
2026 Q2	-	6
2026 Q1	-	1
2025 Q4	-	2
2025 Q3	-	2

PSNL Ownership FAQ

Who Owns Personalis?

Personalis shareholders are primarily institutional investors at 81.68%, followed by 26.15% insiders and -7.83% retail investors. The average institutional ownership in Personalis's industry, Diagnostics & Research Stocks, is 87.40%, which Personalis falls below.

Who owns the most shares of Personalis?

Personalis’s largest shareholders are Merck (14.04M shares, 15.22%), Lightspeed management (8.16M shares, 8.84%), and Ark investment management (7.94M shares, 8.61%). Together, they hold 32.67% of Personalis’s total shares outstanding.

Does Blackrock own Personalis?

Yes, BlackRock owns 6.50% of Personalis, totaling 3.29M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 3.85M$. In the last quarter, BlackRock increased its holdings by 11.39K shares, a 0.35% change.

Who is Personalis’s biggest shareholder by percentage of total assets invested?

Merck is Personalis’s biggest shareholder by percentage of total assets invested, with 25.60% of its assets in 14.04M Personalis shares, valued at 89.47M$.

Who is the top mutual fund holder of Personalis shares?

ARK Genomic Revolution is the top mutual fund holder of Personalis shares, with 7.36% of its total shares outstanding invested in 7.86M Personalis shares.

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