SCHEDULE 13D/A Filed 2026-04-13 Event 2026-04-10 Intent: UNCLEAR SEC 0000921895-26-000973 →

Whitefort Capital Management, LP → Arbutus Biopharma Corp ABUS

Stake: 8.10% Shares: 15,794,261 CUSIP: 03879J100 Class: Common Shares, without par value

Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 49/100 · Filer 90d Win Rate: 67% · Hist. 90d Edge: +7.5%

Filer track record (3 filings): 67% 90d win rate, +7.5% 90d edge
High conviction ownership stake (8.1%)
7 NPORT-P mutual funds holding CUSIP
Moderate short days-to-cover (4.3 DTC)

AI Analyst Brief conf: low

Whitefort Capital initiates a 13D/A on Arbutus Biopharma (ABUS) with a ~15.8M share stake, representing the first activist position on this issuer in 90 days; the amendment suggests an evolving agenda, though no explicit purpose is disclosed in the extract. High short interest (16.2M shares, DTC 7.04) creates a notable squeeze dynamic if Whitefort pushes for a catalyst.

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

27 13D/G filings on this issuer

26 other filings besides this one

Filer Track Record

4 filings by this filer

3 other filings in the data moat

Short Interest · settle 2026-10-15

DTC 4.34

24,566,591 shares short · -27.9% vs prior

Post-Filing Returns · since 2026-04-10 on ABUS

+1 day

+5.3%

+5 days

+8.0%

+30 days

+24.8%

+60 days

+24.8%

+90 days

+23.9%

+180 days

+1.0%

Anchor price 4.15 on closest trading day on/after 2026-04-10. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Other 13D/G Filings on Arbutus Biopharma Corp

Filed	Form	Filer	Stake	Shares
2026-10-05	SCHEDULE 13D/A	Roivant Sciences Ltd.	19.50%	29,880,079	view →
2026-09-04	SCHEDULE 13G	Whitefort Capital Management, LP	—	—	view →
2026-04-28	SCHEDULE 13D/A	Whitefort Capital Management, LP	—	15,794,261	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	Dexxon Holdings 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 →
2019-01-03	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	Machado Patrick	—	—	view →

Showing 20 of 26

Other Filings by Whitefort Capital Management, LP

Filed	Form	Issuer	Stake	Shares
2026-09-04	SCHEDULE 13G	Arbutus Biopharma Corp	—	—	view →
2026-04-28	SCHEDULE 13D/A	Arbutus Biopharma Corp ABUS	—	15,794,261	view →
2025-02-21	SCHEDULE	Arbutus Biopharma Corp ABUS	7.00%	13,307,967	view →

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