Viking Obesity Pill Faces Steep Climb Against Lilly's Tirzepatide, Analyst Calls Downtrend Reaction 'Extreme'

Core Insights - Investors are disappointed with Viking Therapeutics Inc.'s VKTX data from its Phase 2 trial of an obesity pill, VK2735, which showed a mean body weight reduction of up to 12.2% after 13 weeks from baseline, but concerns over tolerability and higher discontinuation rates have led to a significant stock sell-off [1][3]. Group 1: Trial Results - Participants receiving VK2735 demonstrated a mean body weight reduction of up to 12.2% after 13 weeks from baseline [1]. - VK2735 showed up to a 10.9% reduction in body weight compared to the placebo, with no plateau observed for weight loss at 13 weeks [1]. - All doses of VK2735 greater than 15 mg demonstrated statistically significant differences relative to the placebo on key secondary endpoints, assessing the proportion of subjects who achieved at least 5% and 10% weight loss [2]. Group 2: Tolerability and Discontinuation - Concerns have arisen regarding the tolerability profile of VK2735, with higher rates of discontinuation compared to the Phase I study, which contributed to the stock sell-off [3]. - The 30 mg dose of VK2735 showed a placebo-like safety profile, while the 60 mg group reported higher adverse events and discontinuations [3]. - There is potential for improved tolerability in pivotal studies if the titration period is extended to four weeks instead of the two weeks used in the VENTURE-Oral study [4]. Group 3: Market Position and Future Outlook - Viking's obesity franchise is viewed favorably from an M&A perspective by big pharma, with William Blair previously naming Viking as a top pick for 2025 and reiterating an Outperform rating on its shares [4]. - The company is unlikely to pursue 90 mg or 120 mg doses due to cost-of-goods constraints, making the debate over their tolerability less relevant [4]. - Comparisons with Eli Lilly's tirzepatide indicate that VK2735's dose levels are inferior in terms of weight loss at 13 weeks, raising concerns about its competitive position in the market [5]. Group 4: Stock Performance - VKTX stock has experienced a significant decline, down 41.04% at $24.82 as of the last check on Tuesday [6].