Strong ARCALYST Revenue Growth
ARCALYST product revenue grew 65% year-over-year to $202.1 million in Q4 2025 and 62% year-over-year to $677.6 million for full-year 2025, driven by expanding adoption of IL‑1 alpha and beta inhibition in recurrent pericarditis.
Rapid Collaboration Profit Expansion
ARCALYST collaboration profit increased 83% year-over-year to $140 million in Q4 2025 and rose 96% year-over-year to $459 million for the full year, growing faster than sales and materially contributing to overall profitability.
Return to Profitability and Improved Income Statement
Net income was $14.2 million in Q4 2025 versus a net loss of $8.9 million in Q4 2024; full-year 2025 net income was $59.0 million versus a net loss of $43.2 million in 2024, reflecting operational leverage from ARCALYST growth.
Strong Cash Generation and Balance Sheet
Kiniksa ended 2025 with $414.1 million in cash, representing $170.4 million of net cash generation for the year, and expects to remain cash-flow positive on an annual basis under the current plan.
Commercial Momentum and Prescriber Adoption
More than 4,150 prescribers have written ARCALYST prescriptions, with ~29% (over 1,200) having treated 2+ patients; average total duration of therapy is approaching 3 years, demonstrating strong adherence and repeat use.
Increasing Penetration in Target Patient Population
Penetration into the 2+ recurrence target market rose to approximately 18% at year-end 2025, up from ~15% mid-2025 and 13% at the end of 2024, indicating accelerating capture of the multiple-recurrence segment.
Reaffirmed 2026 Revenue Guidance
Company reiterated full-year 2026 net revenue guidance for ARCALYST of $900 million to $920 million, reflecting confidence in continued commercial expansion.
Advancing Pipeline with Clear Clinical Milestones
KPL-387 Phase II/III program achieved planned starts (Phase II initiated mid-2025) and remains on track for Phase II readout in the second half of 2026; company plans to be in clinic with KPL-1161 by year-end 2026. FDA interactions have been productive and the integrated KPL-387 program is designed to support registration.