On August 21, Cerebras Systems fell 5.51% in regular trading, trading at $197.7/share, with turnover of $446 million. The stock extended its multi-day decline as a major insider sale filing compounded existing sell-the-news pressure.

According to SEC filings, co-founder and executive Sean Lie plans to sell 710,247 shares of common stock through Morgan Stanley, with a total estimated value of approximately $153 million. This follows director Steven Vassallo's recent trust-based disposal of roughly 50,000 shares, marking consecutive insider reductions that have weighed heavily on market sentiment.

The decline also extends a broader pattern of profit-taking following the CS-4 AI accelerator launch and Q2 earnings that missed expectations — revenue of $180.11 million fell short of the $194 million consensus despite 74% year-over-year growth. Although management raised full-year core revenue guidance to $880–$890 million and received bullish coverage from UBS and Morgan Stanley on the CS-4 architecture, the prior 13%-plus rally driven by Wedbush's OpenAI partnership outlook had already priced in much of the upside.

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