Arbutus Biopharma

ABUS · NASDAQ

$4.33+$0.10 (+2.36%)TodayMarket closed · Oct 20, 7:46 PM ET

Prev close $4.23

Who owns ABUS

Largest institutional holders, from their latest 13F filings

The 10 largest institutions hold 67.7% of ABUS’s shares.

Roivant Sciences Ltd.19.7%
Two Seas Capital LP9.7%
Morgan Stanley Investment Management Inc. (US)8.7%
Whitefort Capital Management, LP8.0%
Next 6 largest institutions21.7%
All other shareholders32.3%

Top institutional holders of ABUS
Holder	Shares	% of shares	Change, last filing	Filed
Roivant Sciences Ltd.	38.85M	19.67%	+0	Mar 30, 2026
Two Seas Capital LP	19.10M	9.67%	+538.04K	Jun 30, 2026
Morgan Stanley Investment Management Inc. (US)	17.12M	8.67%	−8.13M	Jun 30, 2026
Whitefort Capital Management, LP	15.79M	8.00%	+0	Jun 30, 2026
BlackRock Institutional Trust Company, N.A.	12.22M	6.18%	+813.15K	Jun 30, 2026
State Street Investment Management (US)	7.87M	3.98%	+1.53M	Jun 30, 2026
Rubric Capital Management LP	7.53M	3.81%	+906.55K	Jun 30, 2026
Vanguard Capital Management, LLC	7.01M	3.55%	+321.77K	Jun 30, 2026
Geode Capital Management, L.L.C.	4.12M	2.08%	+345.88K	Jun 30, 2026
Barclays Capital Inc.	4.10M	2.08%	−119.12K	Jun 30, 2026

Largest mutual fund holders

Top mutual fund holders of ABUS
Holder	Shares	% of shares	Change, last filing	Filed
Vanguard Total Stock Market Index Fund	5.03M	2.55%	+0	Jul 31, 2026
iShares Russell 2000 ETF	4.09M	2.07%	−17.86K	Jul 31, 2026
State Street SPDR S&P Biotech ETF	3.88M	1.96%	+260.38K	Aug 31, 2026
Morgan Stanley Insight Fund	2.73M	1.38%	−1.11M	Jun 30, 2026
MS INVF Global Insight Fund	2.50M	1.27%	+0	Mar 31, 2026

Insider trades

Form 4 filings by officers, directors and large holders

Insiders made no open-market buys or sales of ABUS in the last 6 months.

Latest ABUS insider transactions
Insider	Date	Type	Shares	Price	Value
Nguyen Tuan	Oct 1, 2026	Other	48.08K	$5.00	$240.41K
Sawhney Roger	Oct 1, 2026	Other	17.14K	$5.00	$85.71K
Androski Lindsay	Oct 1, 2026	Other	24.66K	$5.00	$123.28K
Beardsley Robert A	Oct 1, 2026	Other	17.95K	$5.00	$89.74K
Androski Lindsay	Sep 18, 2026	Option exercise	10.46K	—	—
Androski Lindsay	Sep 18, 2026	Option exercise	116.41K	—	—
Androski Lindsay	Sep 18, 2026	Tax withholding	82.53K	$5.07	$418.41K
Androski Lindsay	Sep 18, 2026	Option exercise	10.46K	$4.39	$45.90K
Androski Lindsay	Sep 18, 2026	Option exercise	116.41K	$3.20	$372.51K
Nguyen Tuan	Sep 18, 2026	Option exercise	27.48K	—	—

Short interest

Settled Sep 30, 2026

Shares short: 34.05M
Days to cover: 3.53
% of shares outstanding: 17.24%
Average daily volume: 9.65M
Change since last report: +84.2%

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