ISSUER PROFILE · CIK 0001447028 · CUSIP 03879J100
Arbutus Biopharma CorpABUS
25 13D/G filings
8 distinct filers
0 insider transactions (365d)
1 UNCLEAR
Post-Filing Returns · across 4 activist filings on this issuer
Median 180d
+1.5%
avg +1.4%
Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.
Cross-Reference Snapshot
Activist filings
25
2 SCHEDULE 13D/A · 3 SCHEDULE · 20 SC
Distinct filers
8
multi-activist cluster
Insiders (365d)
0
0 buys · 0 sales
Latest short DTC
9.18
as of 2026-05-29
13D/G Filings Timeline · 25 total
| Filed | Form | Filer | Stake | Shares | Intent | |
|---|
| 2026-04-28 |
SCHEDULE 13D/A |
Whitefort Capital Management, LP |
— |
15,794,261 |
|
view → |
| 2026-04-13 |
SCHEDULE 13D/A |
Whitefort Capital Management, LP |
8.10% |
15,794,261 |
UNCLEAR |
view → |
| 2025-02-25 |
SCHEDULE |
Roivant Sciences Ltd. |
20.50% |
38,847,462 |
|
view → |
| 2025-02-21 |
SCHEDULE |
Whitefort Capital Management, LP |
7.00% |
13,307,967 |
|
view → |
| 2025-02-18 |
SCHEDULE |
Roivant Sciences Ltd. |
20.50% |
38,847,462 |
|
view → |
| 2021-10-20 |
SC |
Roivant Sciences Ltd. |
— |
— |
|
view → |
| 2019-07-17 |
SC |
Lo Andrew |
— |
— |
|
view → |
| 2019-07-17 |
SC |
Machado Patrick |
— |
— |
|
view → |
| 2019-07-16 |
SC |
Roivant Sciences Ltd. |
— |
— |
|
view → |
| 2019-07-12 |
SC |
SVF Investments (UK) Ltd |
— |
— |
|
view → |
| 2019-07-12 |
SC |
VIKING GLOBAL INVESTORS LP |
— |
— |
|
view → |
| 2019-07-12 |
SC |
QVT Financial LP |
— |
— |
|
view → |
| 2019-07-12 |
SC |
Dexxon Holdings Ltd. |
— |
— |
|
view → |
| 2019-01-03 |
SC |
VIKING GLOBAL INVESTORS LP |
— |
— |
|
view → |
| 2018-04-23 |
SC |
Roivant Sciences Ltd. |
— |
— |
|
view → |
| 2018-04-12 |
SC |
Roivant Sciences Ltd. |
— |
— |
|
view → |
| 2018-03-16 |
SC |
Roivant Sciences Ltd. |
— |
— |
|
view → |
| 2018-02-14 |
SC |
Roivant Sciences Ltd. |
— |
— |
|
view → |
| 2018-01-16 |
SC |
Roivant Sciences Ltd. |
— |
— |
|
view → |
| 2018-01-16 |
SC |
SVF Investments (UK) Ltd |
— |
— |
|
view → |
| 2018-01-16 |
SC |
Lo Andrew |
— |
— |
|
view → |
| 2018-01-16 |
SC |
VIKING GLOBAL INVESTORS LP |
— |
— |
|
view → |
| 2018-01-16 |
SC |
QVT Financial LP |
— |
— |
|
view → |
| 2018-01-16 |
SC |
Dexxon Holdings Ltd. |
— |
— |
|
view → |
| 2018-01-16 |
SC |
Machado Patrick |
— |
— |
|
view → |
FINRA Short Interest History
| Settlement | Short Interest | Days to Cover | % Δ vs prior |
|---|
| 2026-05-29 |
16,982,764 |
9.18 |
+3.3% |
| 2026-05-15 |
16,438,082 |
17.08 |
-7.4% |
| 2026-04-30 |
17,743,389 |
7.17 |
-0.3% |
| 2026-04-15 |
17,803,913 |
11.44 |
+10.1% |
| 2026-03-31 |
16,174,093 |
7.04 |
-1.4% |
| 2026-03-13 |
16,405,599 |
4.18 |
+11.2% |
| 2026-02-27 |
14,756,509 |
9.52 |
-1.6% |
| 2026-02-13 |
14,998,521 |
6.43 |
+10.6% |
| 2026-01-30 |
13,558,940 |
7.47 |
+3.8% |
| 2026-01-15 |
13,067,041 |
12.17 |
+4.2% |
| 2025-12-31 |
12,535,638 |
8.63 |
+16.7% |
| 2025-12-15 |
10,740,954 |
9.28 |
-4.2% |
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