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The combination of a substantial guidance cut and a high-profile legal investigation creates negative sentiment and potential further volatility. The 28% immediate drop demonstrates sensitivity to such news; unless the investigation yields concrete, price-relevant developments, the near-term risk remains skewed to the downside.
What happened, with direct paths to the underlying reporting
Kirby McInerney LLP notes an ongoing investigation into Alnylam (ALNY) for potential securities-law violations, while the company cut 2026 TTR revenue guidance by about $200 million after Q2 results. The stock fell roughly 28% to $205.48 on July 30, 2026. No lawsuit has been filed yet, but the legal inquiry adds near-term volatility and uncertainty to ALNY’s trajectory.
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