Jade Biosciences reports Phase 1 interim data: JADE101 shows ~70% IgA reduction, favorable safety, differentiated PK

Jade Biosciences, Inc.

Mean IgA reduction ~70% from baseline, sustained at 12 weeks with single 700 mg dose; steady-state simulation supports Q12W dosing.
JADE101 estimated 379-fold more potent than sibeprenlimab and 26-fold more potent than povetacicept in IgA-lowering.
Favorable safety: no serious AEs, no discontinuations, no hypogammaglobulinemia; most common AEs were headache (25%), URTI (21.9%).
Half-life at steady state ~8.7x longer than povetacicept and ~2.6x longer than sibeprenlimab, supporting convenient dosing (4 injections/year).
Phase 2 JUNIPER trial ongoing; registrational Phase 3 planned for H1 2027.

item 7.01 item 8.01 item 9.01

Machine-readable event card

schema_version: secwatch.filing_event.v1
accession: 0001193125-26-249763
form_type: 8-K
ticker: JBIO
cik: 0001798749
company_name: Jade Biosciences, Inc.
filed_at: 2026-06-01T11:55:09+00:00
discovered_at: 2026-06-01T12:00:00.283193+00:00
generated_at: 2026-06-01T12:00:52.710902+00:00
sec_items: ["7.01", "8.01", "9.01"]
event_type: other_material
sentiment: positive
materiality_score: 0.75
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confidence: high
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json_url: https://secwatch.observer/filing/0001193125-26-249763.json
markdown_url: https://secwatch.observer/filing/0001193125-26-249763.md
text_url: https://secwatch.observer/filing/0001193125-26-249763.txt
edgar_index_url: https://www.sec.gov/Archives/edgar/data/1798749/000119312526249763/0001193125-26-249763-index.htm
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review_status: machine_generated
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