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Pacific Biosciences of California PACB

US equityMarket cap rank #3366Medical Devices

$2.72 +$0.02 (+0.74%)

Pre-market · Oct 8, 9:10 am ET · After hours $2.70 -0.74%

Open$2.62

Prev close$2.70

Day range$2.50 – $2.74

Volume20.37M

Market cap$845.46M

P/E (TTM)–

Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership60.8%-2.12 pts vs. prior quarter

Institutions holding258-1 vs. prior quarter

Insider trades (recent)38 buys / 12 sellsNet buying

ARK fund activity-191,794 sh1 recent transactions · last 14 Jun 2026

Short interest15.73% of floatDays to cover 10.5 · as of 15 Sep 2026

Short-sale volume share19.1%5-day average of daily volume

Short-sale volume as % of daily volume

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$15.43M (5 inflow days, 15 outflow days).

Net flow by order size, last 20 sessions

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 34.0% of shares outstanding.

Largest holders

BlackRock10.40%
ARK Investment Management LLC9.58%
SoftBank Group Corp.6.58%
Vanguard Capital Management, LLC5.01%
Geode Capital Management, LLC2.45%
Amova Asset Management1.93%
State Street Global Advisors1.92%
Point72 Asset Management, L.P.1.54%

By investor type

Mutual Fund40.62%
Hedge Fund8.82%
Public Company8.06%
Private Company2.24%
Individual/Insider1.07%
VC/PE Fund0.54%
Insurance Company0.31%
Government Pension Fund0.09%

Reported short interest has risen from 15.29% to 15.73% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

Holder	Type	Period	Share change	New stake
Nuveen Asset Management LLC	Insurance Company	2026/Q3	+964,115	0.3%
BlackRock	Mutual Fund	2026/Q3	+7,072,121	10.4%
Point72 Asset Management, L.P.	Hedge Fund	2026/Q3	+4,501,600	1.5%
Longaeva Partners L.P.	Mutual Fund	2026/Q3	+2,118,231	0.7%
The Goldman Sachs Group, Inc.	Public Company	2026/Q3	+1,291,287	0.6%
Citadel Advisors LLC	Hedge Fund	2026/Q3	+1,269,852	0.9%
Goldman Sachs Asset Management, L.P.	Mutual Fund	2026/Q3	+950,133	0.4%
Vanguard Capital Management, LLC	Mutual Fund	2026/Q3	+821,629	5.0%
Two Sigma Investments, LP	Hedge Fund	2026/Q3	+732,986	1.4%
Geode Capital Management, LLC	Mutual Fund	2026/Q3	+631,252	2.4%
Numerai GP LLC	Hedge Fund	2026/Q3	+621,469	0.2%
Numeric Investors LLC	Hedge Fund	2026/Q3	+597,334	0.2%
AQR Capital Management	Hedge Fund	2026/Q3	+571,345	0.4%
D. E. Shaw & Co., L.P.	Hedge Fund	2026/Q3	+570,599	1.4%
Susquehanna International Group, LLP	Private Company	2026/Q3	+410,098	0.7%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
16 Aug 2026	Mark Van Oene	Chief Operating Officer	Open Market Disposition	-26,911	$1.13	1,010,972
9 Aug 2026	Mark Van Oene	Chief Operating Officer	Other Acquisition	+489,130	–	1,769,881
9 Aug 2026	Mark Van Oene	Chief Operating Officer	Other Derivative Acquisition	+1,967,888	$1.15	1,967,888
2 Jun 2026	William Ericson	Independent Director	Other Derivative Acquisition	+223,492	$1.58	223,492
2 Jun 2026	Kathy Ordonez	Independent Director	Other Derivative Acquisition	+223,492	$1.58	223,492
2 Jun 2026	John Milligan	Independent Chairperson	Other Derivative Acquisition	+223,492	$1.58	223,492
2 Jun 2026	Marshall Mohr	Independent Director	Other Derivative Acquisition	+223,492	$1.58	223,492
2 Jun 2026	Christopher Smith	Director	Other Derivative Acquisition	+223,492	$1.58	223,492
2 Jun 2026	Randall Livingston	Independent Director	Other Derivative Acquisition	+223,492	$1.58	223,492
2 Jun 2026	Christopher Gibson	Director	Other Derivative Acquisition	+74,497	$1.58	74,497
2 Jun 2026	Hannah Valantine	Independent Director	Other Derivative Acquisition	+223,492	$1.58	223,492
7 Apr 2026	Christopher Gibson	Director	Other Acquisition	+57,473	–	111,386
7 Apr 2026	Christopher Gibson	Director	Other Derivative Acquisition	+77,842	$1.52	77,842
31 Mar 2026	James Gibson	Chief Financial Officer	Open Market Disposition	-88,185	$1.37	161,815
2 Mar 2026	Christian O. Henry	Chief Executive Officer	Open Market Disposition	-12,497	$1.51	1,249,042
2 Mar 2026	Christopher Gibson	Director	Other Acquisition	+53,913	–	53,913
2 Mar 2026	Christopher Gibson	Director	Other Derivative Acquisition	+73,087	$1.52	73,087
2 Mar 2026	Mark Van Oene	Chief Operating Officer	Open Market Disposition	-6,504	$1.51	962,883
2 Mar 2026	Michele Farmer	Vice President	Open Market Disposition	-2,979	$1.51	100,479
26 Feb 2026	Christian O. Henry	Chief Executive Officer	Other Acquisition	+920,810	–	2,359,646

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report date	Shares short	% of float	Days to cover
15 Sep 2026	48,892,225	15.7%	10.5
31 Aug 2026	49,578,770	16.0%	6.8
14 Aug 2026	53,412,027	17.2%	6.6
31 Jul 2026	49,004,841	15.8%	7.4
15 Jul 2026	46,237,636	14.9%	10.0
30 Jun 2026	47,490,204	15.3%	6.5

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