November 12, 2025 Third Quarter Financial and Business Update 1 DISCLAIMERS Forward-Looking Statements This presentation contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are neither historical facts nor assurances of future performance. Instead, they are based on our current beliefs, expectations and assumptions regarding the future of our business, future plans and strategies, our clinical results and other future c ...

HCV Program & Clinical Trials - Phase 3 trial C-BEYOND (US/Canada) and C-FORWARD (Outside North America) initiated with first patient dosed in April and June 2025 respectively[12] - Phase 2 results showed 98% SVR12 in treatment adherent patients and 95% SVR12 regardless of adherence[28,29] - Phase 2 results also demonstrated 99% SVR12 in non-cirrhotic treatment adherent patients across genotypes and 97% SVR12 regardless of adherence[31,32] Market Opportunity & KOL Insights - Untreated HCV infections in the US range from 24 million to 4 million, with over 170,000 newly reported annual infections exceeding annual cures[16] - The US HCV market is estimated at ~$15 billion in 2024, with a potential market opportunity exceeding $20 billion[19] - KOL panel highlighted the need for simpler, shorter HCV treatments with fewer drug-drug interactions to improve patient adherence and expand the test-and-treat model[49] Financial Status - Cash, cash equivalents, and marketable securities totaled $3797 million as of June 30, 2025, providing a cash runway through 2027[13] - The company authorized and initiated a repurchase of up to $25 million of its common stock in April 2025, with 46 million shares repurchased as of June 30, 2025[9,67] - Net loss for the second quarter of 2025 was $37161 million, compared to $40522 million for the same period in 2024[64]