Who owns Arbutus Biopharma (ABUS)
Which tracked institutional funds hold ABUS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ABUS company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
39 tracked funds added or opened ABUS while 16 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
ABUS’s largest tracked holder by dollar value, Two Seas Capital LP, sizes it at 3.5% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 3.5pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ABUS divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 170 tracked filers holding ABUS, 93 increased or opened the position and 68 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in ABUS between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 10
- NOMURA HOLDINGS INC$8M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$3M
- MACKENZIE FINANCIAL CORP$3M
- LOS ANGELES CAPITAL MANAGEMENT LLC$3M
- Jupiter Topco LLC$3M
- Man Group plc$2M
Full exits 6
- ADAGE CAPITAL PARTNERS GP, L.L.C.$12M
- MILLENNIUM MANAGEMENT LLC$3M
- RAYMOND JAMES FINANCIAL INC$861K
- BALYASNY ASSET MANAGEMENT L.P.$565K
- Avidity Partners Management LP$562K
- SCHRODER INVESTMENT MANAGEMENT GROUP$522K
Largest adds
- GOLDMAN SACHS GROUP INC$12M
- STATE STREET CORP$9M
- Whitefort Capital Management, LP$9M
- Two Seas Capital LP$8M
- BlackRock, Inc.$8M
- Rubric Capital Management LP$6M
Largest trims
- MORGAN STANLEY$32M
- ADAR1 Capital Management, LLC$8M
- UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$3M
- CITADEL ADVISORS LLC$1M
- Quinn Opportunity Partners LLC$1M
- Hudson Bay Capital Management LP$855K
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Two Seas Capital LP added | 19,095,583 | $92M | 13.7% | 2026-Q2 |
| MORGAN STANLEY trimmed | 17,698,305 | $85M | 12.7% | 2026-Q2 |
| Whitefort Capital Management, LP added | 15,794,261 | $76M | 11.3% | 2026-Q2 |
| BlackRock, Inc. added | 13,766,071 | $66M | 9.9% | 2026-Q2 |
| STATE STREET CORP added | 7,869,179 | $38M | 5.6% | 2026-Q2 |
| Rubric Capital Management LP added | 7,532,937 | $36M | 5.4% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 7,010,679 | $34M | 5.0% | 2026-Q2 |
| BARCLAYS PLC trimmed | 4,207,914 | $20M | 3.0% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 4,117,691 | $20M | 3.0% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 3,506,802 | $17M | 2.5% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 2,646,197 | $13M | 1.9% | 2026-Q2 |
| BlackBarn Capital Partners LP | 2,500,000 | $12M | 1.8% | 2026-Q2 |
| Legal & General Group Plc added | 2,466,127 | $12M | 1.8% | 2026-Q2 |
| Woodline Partners LP added | 2,281,856 | $11M | 1.6% | 2026-Q2 |
| Jefferies Financial Group Inc. trimmed | 1,711,672 | $8M | 1.2% | 2026-Q2 |
| NOMURA HOLDINGS INC added | 1,637,081 | $8M | 1.2% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 1,541,458 | $7M | 1.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 1,431,218 | $7M | 1.0% | 2026-Q2 |
| NORTHERN TRUST CORP added | 1,419,024 | $7M | 1.0% | 2026-Q2 |
| OSAIC HOLDINGS, INC. trimmed | 1,347,866 | $6M | 1.0% | 2026-Q2 |
| ADAR1 Capital Management, LLC trimmed | 1,268,147 | $6M | 0.9% | 2026-Q2 |
| Deltroit Asset Management (UK) LLP added | 1,200,000 | $6M | 0.9% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 1,135,362 | $5M | 0.8% | 2026-Q2 |
| CITIGROUP INC trimmed | 879,237 | $4M | 0.6% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ trimmed | 777,938 | $4M | 0.6% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 650,700 | $3M | 0.5% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP new | 613,806 | $3M | 0.4% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC added | 602,008 | $3M | 0.4% | 2026-Q2 |
| Jupiter Topco LLC new | 597,423 | $3M | 0.4% | 2026-Q2 |
| Western Standard LLC added | 542,787 | $3M | 0.4% | 2026-Q2 |
| Rangeley Capital, LLC | 500,000 | $2M | 0.4% | 2026-Q2 |
| Nuveen, LLC added | 496,609 | $2M | 0.4% | 2026-Q2 |
| Man Group plc added | 473,467 | $2M | 0.3% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 461,646 | $2M | 0.3% | 2026-Q2 |
| Bank of New York Mellon Corp added | 454,115 | $2M | 0.3% | 2026-Q2 |
| CenterBook Partners LP new | 445,151 | $2M | 0.3% | 2026-Q2 |
| Freestone Capital Holdings, LLC | 442,500 | $2M | 0.3% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 404,696 | $2M | 0.3% | 2026-Q2 |
| KENNEDY CAPITAL MANAGEMENT LLC trimmed | 385,298 | $2M | 0.3% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 381,863 | $2M | 0.3% | 2026-Q2 |
| Swiss National Bank added | 286,500 | $1M | 0.2% | 2026-Q2 |
| Ledgewood Wealth Advisors, LLC | 278,436 | $1M | 0.2% | 2026-Q2 |
| FMR LLC added | 267,188 | $1M | 0.2% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC added | 263,685 | $1M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 261,052 | $1M | 0.2% | 2026-Q2 |
| Carrera Capital Advisors added | 257,167 | $1M | 0.2% | 2026-Q2 |
| Quinn Opportunity Partners LLC trimmed | 255,214 | $1M | 0.2% | 2026-Q2 |
| Invesco Ltd. added | 250,907 | $1M | 0.2% | 2026-Q2 |
| UBS Group AG trimmed | 249,208 | $1M | 0.2% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 242,017 | $1M | 0.2% | 2026-Q2 |
| Campbell & CO Investment Adviser LLC added | 230,534 | $1M | 0.2% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 225,099 | $1M | 0.2% | 2026-Q2 |
| Squarepoint Ops LLC added | 208,145 | $999K | 0.1% | 2026-Q2 |
| MARTINGALE ASSET MANAGEMENT L P new | 193,100 | $927K | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 189,423 | $909K | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 185,660 | $891K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 170,454 | $818K | 0.1% | 2026-Q2 |
| STRS OHIO new | 168,900 | $811K | 0.1% | 2026-Q2 |
| Hudson Bay Capital Management LP trimmed | 150,000 | $720K | 0.1% | 2026-Q2 |
| Wealth Management Associates, Inc. added | 147,995 | $710K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 147,994 | $710K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 140,240 | $631K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 133,828 | $643K | 0.1% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 130,023 | $624K | 0.1% | 2026-Q2 |
| Front Row Advisors LLC | 110,500 | $516K | 0.1% | 2026-Q2 |
| Rafferty Asset Management, LLC trimmed | 102,170 | $490K | 0.1% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 98,224 | $460K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 94,351 | $453K | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd | 89,582 | $430K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 85,939 | $411K | 0.1% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 84,986 | $408K | 0.1% | 2026-Q2 |
| JBF Capital, Inc. | 80,281 | $385K | 0.1% | 2026-Q2 |
| Integrated Quantitative Investments LLC new | 79,937 | $384K | 0.1% | 2026-Q2 |
| Virtus Investment Advisers, LLC added | 76,807 | $369K | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 76,210 | $366K | 0.1% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 66,215 | $318K | 0.0% | 2026-Q2 |
| Rockefeller Capital Management L.P. | 63,000 | $302K | 0.0% | 2026-Q2 |
| Creative Planning added | 62,111 | $298K | 0.0% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 59,161 | $284K | 0.0% | 2026-Q2 |
| Quantinno Capital Management LP added | 56,961 | $273K | 0.0% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) trimmed | 55,233 | $265K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 55,152 | $265K | 0.0% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 53,320 | $256K | 0.0% | 2026-Q2 |
| Jump Financial, LLC new | 53,162 | $255K | 0.0% | 2026-Q2 |
| PROFUND ADVISORS LLC trimmed | 53,017 | $254K | 0.0% | 2026-Q2 |
| Police & Firemen's Retirement System of New Jersey added | 51,709 | $248K | 0.0% | 2026-Q2 |
| Exome Asset Management LLC trimmed | 50,166 | $241K | 0.0% | 2026-Q2 |
| Magnetar Financial LLC trimmed | 47,067 | $226K | 0.0% | 2026-Q2 |
| State of New Jersey Common Pension Fund D trimmed | 46,167 | $222K | 0.0% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 44,305 | $213K | 0.0% | 2026-Q2 |
| ALLSTATE CORP new | 44,226 | $212K | 0.0% | 2026-Q2 |
| Quadrature Capital Ltd new | 42,004 | $202K | 0.0% | 2026-Q2 |
| VIRGINIA RETIREMENT SYSTEMS ET Al added | 41,800 | $201K | 0.0% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH new | 39,474 | $189K | 0.0% | 2026-Q2 |
| ARIZONA STATE RETIREMENT SYSTEM trimmed | 39,398 | $189K | 0.0% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM | 35,820 | $172K | 0.0% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND | 35,268 | $169K | 0.0% | 2026-Q2 |
| INTECH INVESTMENT MANAGEMENT LLC added | 34,835 | $167K | 0.0% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 31,741 | $152K | 0.0% | 2026-Q2 |
| Mitsubishi UFJ Trust & Banking Corp new | 31,688 | $152K | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.