ARBUTUS BIOPHARMA CORP ABUS
COM · Common Stock · CUSIP 03879J100 · ISIN CA03879J1003
Canadian Bio Tech Company
- SectorHealth care
- IndustryPharmaceutical Preparations
- HeadquartersWarminster, PA
- Founded2007
- Websitearbutusbio.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($115.4k this quarter). Holder counts are more reliable. Shares outstanding: 191.7m as of 2025-08-04, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $3.09. Options: 11 managers hold calls ($3.3m notional), 8 hold puts ($1.6m).
Trends to Q2 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 127 |
| Q4 2022 | 115 |
| Q1 2023 | 123 |
| Q2 2023 | 112 |
| Q3 2023 | 101 |
| Q4 2023 | 113 |
| Q1 2024 | 120 |
| Q2 2024 | 132 |
| Q3 2024 | 145 |
| Q4 2024 | 155 |
| Q1 2025 | 169 |
| Q2 2025 | 164 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2023 | 41 | 39 |
| Q4 2023 | 48 | 35 |
| Q1 2024 | 52 | 48 |
| Q2 2024 | 69 | 41 |
| Q3 2024 | 72 | 44 |
| Q4 2024 | 71 | 54 |
| Q1 2025 | 69 | 60 |
| Q2 2025 | 77 | 63 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2024 | $9.3m | $2.2m | 0.23 |
| Q4 2024 | $2.4m | $2.4m | 0.98 |
| Q1 2025 | $3.1m | $2.3m | 0.73 |
| Q2 2025 | $3.3m | $1.6m | 0.48 |
Biggest buyers
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Added | +1.0m |
| Two Seas Capital LP | Added | +977.4k |
| GOLDMAN SACHS GROUP INC | Added | +963.8k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Added | +957.8k |
| ADAR1 Capital Management, LLC | Added | +946.7k |
| BANK OF AMERICA CORP /DE/ | Added | +739.4k |
| Aberdeen Group plc | Added | +515.1k |
| ROYAL BANK OF CANADA | Added | +472.1k |
| MORGAN STANLEY | Added | +370.0k |
| Saba Capital Management, L.P. | Added | +280.6k |
Biggest sellers
| Rangeley Capital, LLC | Reduced | -484.0k |
| STEMPOINT CAPITAL LP | Sold out | -467.9k |
| JPMORGAN CHASE & CO | Reduced | -452.6k |
| Hudson Bay Capital Management LP | Reduced | -280.9k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | -182.9k |
| Woodline Partners LP | Reduced | -157.8k |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | -127.3k |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | Sold out | -115.3k |
| Rubric Capital Management LP | Reduced | -105.7k |
| Corebridge Financial, Inc. | Sold out | -71.6k |
Biggest calls
| CITIGROUP INC | Reduced | $1.1m354.9k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $831.8k269.2k shares |
| Eisler Capital Management Ltd. | Added | $379.5k123.2k shares |
| NOMURA HOLDINGS INC | Unchanged | $309.0k100.0k shares |
| CITADEL ADVISORS LLC | Added | $220.0k71.2k shares |
| GROUP ONE TRADING LLC | Added | $144.0k46.6k shares |
| WOLVERINE TRADING, LLC | Added | $137.7k44.0k shares |
| JANE STREET GROUP, LLC | Reduced | $85.6k27.7k shares |
| SIMPLEX TRADING, LLC | Added | $42.0k13.6k shares |
| Affinity Asset Advisors, LLC | New | $28.7k9.3k shares |
Biggest puts
| CITIGROUP INC | Added | $926.7k299.9k shares |
| NOMURA HOLDINGS INC | Unchanged | $309.0k100.0k shares |
| CITADEL ADVISORS LLC | Added | $112.2k36.3k shares |
| SIMPLEX TRADING, LLC | Added | $88.0k28.6k shares |
| WOLVERINE TRADING, LLC | Reduced | $72.0k23.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $58.7k19.0k shares |
| GROUP ONE TRADING LLC | Reduced | $20.1k6.5k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
Roivant Sciences Ltd.
13D · may seek influence
-1.0 pts · filed 2026-10-05
Stated purposeItem 4 is hereby amended by adding the following to the end thereof: On August 24, 2026, the Issuer commenced a modified Dutch auction tender offer to purchase for cancellation up to US$230 million in value of its Common Shares at prices between US$5.00 and US$5.75 per Common Share (the "Offer"), which included the option for shareholders to make a proportionate tender. Roivant made a proportionate tender of its Common Shares in the Offer in order to maintain its proportionate ownership of the Common Shares following completion of the Offer. The Offer expired at 5:00 p.m., New York City time, on September 29, 2026. On October 1, 2026, the Issuer announced that it had taken up and accepted for purchase 46,000,000 Common Shares at a purchase price of US$5.00 per Common Share, including 8,96… Full filing |
19.5% |
| MORGAN STANLEY 13G · institution +3.4 pts · filed 2026-10-07 | 12.2% |
| Two Seas Capital LP 13G · institution +2.9 pts · filed 2026-05-15 | 9.4% |
| Whitefort Capital Management, LP 13G · passive investor no change · filed 2026-09-04 | 8.0% |
| BlackRock, Inc. 13G · institution filed 2026-10-27 | 7.2% |
Insider purchases and sales in Q2 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q3 2023 | 0 | — | 0 | — | — |
| Q4 2023 | 0 | — | 0 | — | — |
| Q1 2024 | 0 | — | 4 | $78.8k | $78.8k |
| Q2 2024 | 0 | — | 0 | — | — |
| Q3 2024 | 0 | — | 1 | $32.6k | — |
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 0 | — | 4 | $251.4k | $251.4k |
| Q2 2025 | 0 | — | 0 | — | — |
None reported in Q2 2025.
Holders, Q2 2025
| Manager | Shares | Change |
|---|---|---|
| MORGAN STANLEY 0.00% of their portfolio | 24.2m $74.7m | Added +370.0k |
| Whitefort Capital Management, LP 15.95% of their portfolio | 13.3m $41.2m | Added +35.3k |
| BlackRock, Inc. 0.00% of their portfolio | 12.9m $39.8m | Added +102.7k |
| Two Seas Capital LP 3.16% of their portfolio | 10.4m $32.3m | Added +977.4k |
| VANGUARD GROUP INC 0.00% of their portfolio | 9.1m $28.1m | Added +131.3k |
| STATE STREET CORP 0.00% of their portfolio | 4.5m $13.8m | Added +96.3k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 3.6m $11.2m | Added +95.9k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 3.0m $9.4m | Added +963.8k |
| ADAR1 Capital Management, LLC 1.42% of their portfolio | 2.8m $8.7m | Added +946.7k |
| BlackBarn Capital Partners LP 2.67% of their portfolio | 2.6m $8.0m | Added +261.6k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.01% of their portfolio | 2.6m $8.0m | Added +1.0m |
| FOURSIXTHREE CAPITAL LP 3.63% of their portfolio | 2.6m $7.9m | Added +106.9k |
| Woodline Partners LP 0.04% of their portfolio | 2.5m $7.7m | Reduced -157.8k |
| Rubric Capital Management LP 0.08% of their portfolio | 1.6m $4.9m | Reduced -105.7k |
| OSAIC HOLDINGS, INC. 0.01% of their portfolio | 1.3m $4.1m | Reduced -6.4k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 1.3m $4.0m | Added +618 |
| Saba Capital Management, L.P. 0.11% of their portfolio | 1.3m $3.9m | Added +280.6k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 1.3m $3.9m | Added +31.8k |
| FourWorld Capital Management LLC 2.72% of their portfolio | 1.2m $3.8m | Unchanged |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 1.2m $3.7m | Added +739.4k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 1.1m $3.3m | Added +957.8k |
| Aberdeen Group plc 0.01% of their portfolio | 982.5k $3.0m | Added +515.1k |
| Hudson Bay Capital Management LP 0.02% of their portfolio | 965.0k $3.0m | Reduced -280.9k |
| Rangeley Capital, LLC 3.35% of their portfolio | 865.0k $2.7m | Reduced -484.0k |
| BANK OF MONTREAL /CAN/ 0.00% of their portfolio | 600.4k $1.9m | Added +19.4k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 534.4k $1.6m | Added +472.1k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 531.6k $1.6m | Added +21.0k |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 499.5k $1.5m | Added +151.3k |
| Quinn Opportunity Partners LLC 0.12% of their portfolio | 464.5k $1.4m | Unchanged |
| KENNEDY CAPITAL MANAGEMENT LLC 0.03% of their portfolio | 449.2k $1.4m | Added +29.8k |
| Freestone Capital Holdings, LLC 0.05% of their portfolio | 442.5k $1.4m | Unchanged |
| Nuveen, LLC 0.00% of their portfolio | 411.3k $1.3m | Added +97.9k |
| BARCLAYS PLC 0.00% of their portfolio | 406.6k $1.3m | Added +180.4k |
| Qube Research & Technologies Ltd 0.00% of their portfolio | 368.0k $1.1m | Added +72.7k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 366.4k $1.1m | Added +17.6k |
| Ledgewood Wealth Advisors, LLC 0.54% of their portfolio | 278.4k $860.4k | Unchanged |
| Eisler Capital Management Ltd. 0.03% of their portfolio | 276.4k $851.2k | Added +1.4k |
| Swiss National Bank 0.00% of their portfolio | 276.3k $853.8k | Unchanged |
| BOOTHBAY FUND MANAGEMENT, LLC 0.02% of their portfolio | 262.3k $810.4k | Added +100.0k |
| CITIGROUP INC 0.00% of their portfolio | 229.8k $710.1k | Reduced -32.0k |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 222.8k $688.4k | Reduced -58.0k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 219.4k $678.0k | Reduced -182.9k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 207.8k $642.1k | Added +7.0k |
| UBS Group AG 0.00% of their portfolio | 190.2k $587.7k | Reduced -2.1k |
| Invesco Ltd. 0.00% of their portfolio | 181.1k $559.5k | Added +41.6k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 132.8k $410.2k | Unchanged |
| Legal & General Group Plc 0.00% of their portfolio | 124.5k $384.7k | Added +6.1k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.00% of their portfolio | 121.3k $374.9k | New |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 120.3k $371.6k | Reduced -31.1k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 120.2k $371.5k | Unchanged |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 113.7k $351.4k | Reduced -33.2k |
| Wealth Management Associates, Inc. 0.13% of their portfolio | 104.9k $324.2k | Added +8.5k |
| FRANKLIN RESOURCES INC 0.00% of their portfolio | 104.4k $322.7k | Added +12.0k |
| Zurcher Kantonalbank (Zurich Cantonalbank) 0.00% of their portfolio | 100.3k $310.0k | Added +16.2k |
| NOMURA HOLDINGS INC 0.00% of their portfolio | 96.3k $297.5k | New |
| MetLife Investment Management, LLC 0.00% of their portfolio | 88.8k $274.3k | Reduced -121 |
| Rafferty Asset Management, LLC 0.00% of their portfolio | 88.5k $273.3k | Added +5.6k |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio | 87.3k $270.1k | Reduced -3.8k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 86.1k $266.0k | Reduced -452.6k |
| ExodusPoint Capital Management, LP 0.00% of their portfolio | 81.1k $251.0k | Added +1.6k |
| FMR LLC 0.00% of their portfolio | 80.7k $249.5k | Added +2.7k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 80.5k $248.6k | Added +8.3k |
| Clear Harbor Asset Management, LLC 0.02% of their portfolio | 79.8k $246.5k | Unchanged |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 76.5k $237.0k | Added +11.0k |
| INTECH INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 75.8k $234.4k | Unchanged |
| Exome Asset Management LLC 0.20% of their portfolio | 75.5k $233.2k | New |
| Mitsubishi UFJ Asset Management Co., Ltd. 0.00% of their portfolio | 73.5k $227.2k | Reduced -2.5k |
| EntryPoint Capital, LLC 0.09% of their portfolio | 61.1k $188.8k | Added +42.4k |
| JANUS HENDERSON GROUP PLC 0.00% of their portfolio | 60.9k $187.9k | Unchanged |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 59.4k $183.4k | Added +3.5k |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 56.0k $172.9k | Reduced -127.3k |
| Creative Planning 0.00% of their portfolio | 52.9k $163.6k | Reduced -9.2k |
| Ensign Peak Advisors, Inc 0.00% of their portfolio | 45.0k $139.1k | Added +23.1k |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 43.3k $133.8k | Reduced -35.6k |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 43.1k $133.3k | Reduced -39.9k |
| Caption Management, LLC 0.01% of their portfolio | 41.9k $129.4k | Added +17.7k |
| ARIZONA STATE RETIREMENT SYSTEM 0.00% of their portfolio | 41.8k $129.3k | Added +1.1k |
| D. E. Shaw & Co., Inc. 0.00% of their portfolio | 40.7k $125.8k | New |
| Premier Path Wealth Partners, LLC 0.02% of their portfolio | 40.0k $123.6k | Unchanged |
| Assenagon Asset Management S.A. 0.00% of their portfolio | 39.6k $122.4k | New |
| Man Group plc 0.00% of their portfolio | 39.0k $120.5k | New |
| TEACHER RETIREMENT SYSTEM OF TEXAS 0.00% of their portfolio | 38.7k $119.6k | Added +453 |
| China Universal Asset Management Co., Ltd. 0.01% of their portfolio | 38.5k $118.9k | Added +458 |
| ProShare Advisors LLC 0.00% of their portfolio | 38.2k $118.0k | Reduced -2.0k |
| AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 37.7k $116.5k | Reduced -10.5k |
| VIRGINIA RETIREMENT SYSTEMS ET Al 0.00% of their portfolio | 36.3k $112.2k | Reduced -3.3k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.00% of their portfolio | 35.8k $110.7k | Unchanged |
| MERCER GLOBAL ADVISORS INC /ADV 0.00% of their portfolio | 35.7k $110.2k | Added +15.2k |
| Police & Firemen's Retirement System of New Jersey 0.00% of their portfolio | 30.0k $92.6k | Unchanged |
| GROUP ONE TRADING LLC 0.00% of their portfolio | 26.6k $82.1k | Reduced -14.5k |
| Virtus Investment Advisers, LLC 0.03% of their portfolio | 26.3k $81.2k | Reduced -19.8k |
| MONETA GROUP INVESTMENT ADVISORS LLC 0.00% of their portfolio | 26.0k $80.3k | Unchanged |
| KLP KAPITALFORVALTNING AS 0.00% of their portfolio | 25.6k $79.1k | Unchanged |
| PRELUDE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 25.3k $78.2k | New |
| Pictet Asset Management Holding SA 0.00% of their portfolio | 23.9k $73.9k | Unchanged |
| XTX Topco Ltd 0.00% of their portfolio | 23.9k $73.9k | Reduced -48.5k |
| Squarepoint Ops LLC 0.00% of their portfolio | 23.8k $73.6k | Added +6.5k |
| SG Americas Securities, LLC 0.00% of their portfolio | 23.4k $72.0k | Reduced -26.6k |
| SIMPLEX TRADING, LLC 0.00% of their portfolio | 22.0k $67.0k | Reduced -14.2k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 21.9k $67.6k | Unchanged |