Summary
• Mereo BioPharma’s shares dropped 90.3% to $0.2246 following disappointing Phase 3 clinical trial results for setrusumab (UX143).
• The studies failed to meet primary endpoints, triggering heavy trading with over 90 million shares exchanged.
• Despite the decline, analysts maintain a “Buy” rating with price targets between $5 and $6, indicating potential long-term value.
Mereo BioPharma Group plc’s shares are currently trading at $0.2246, reflecting a staggering intraday decline of 90.3% from the previous close. This sharp move appears to be driven by investor reactions to recently announced clinical trial results, as the stock faced heavy trading activity with a volume of over 90 million shares.
Disappointing Clinical Trial Outcomes
The recent announcement detailing the Phase 3 ORBIT and COSMIC studies results for setrusumab (UX143) in osteogenesis imperfecta has unsettled investors. Neither study met its primary endpoint, specifically concerning the reduction in annualized clinical fracture rate when compared to placebo in the ORBIT study or bisphosphonates in the COSMIC trial. This failure to deliver on expected outcomes has resulted in a dramatic shift in market sentiment and stock performance.
Market Performance Overview
As an indication of recent performance, MREO displayed a mix of volatility and declining trends over various time frames. Although the stock showed a 20.3% increase in weekly performance prior to the announcement, its yearly performance plummeted by nearly 30%. Current averages indicate that the stock has a 14-day RSI of 63.97, suggesting a prior overbought condition before today’s sell-off. Despite maintaining an average trading volume of 2.09 million over the past ten days, the recent activity is significantly elevated.
Analyst Sentiment
In terms of analyst sentiment, Mereo currently holds a “Buy” rating, with several analysts maintaining their price targets of between $5 and $6 despite the current setbacks. Analysts had previously rated the stock highly, underscoring the potential seen in its drug pipeline prior to the latest announcement.
Broader Market Context
Despite the turmoil affecting MREO, its performance metrics emphasize the challenging landscape for biopharmaceutical companies. With therapeutic trials often yielding uncertain outcomes, investors are advised to closely monitor ongoing developments and strategic adjustments from the company in the aftermath of this setback.
The recent clinical trial revelations have unquestionably altered the landscape for Mereo BioPharma, raising questions about its future trajectory and operational strategy in this highly competitive market.


