Corporate insiders at US public companies sold roughly $10 worth of shares for every $1 they bought in August, making it the worst buy:sell ratio of the year, according to SEC Form 4 filings. September’s slightly less abysmal 1:3.6 ratio doesn’t indicate improving sentiment.

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Major indices traded within 3% of all-time highs on Friday, right before Anthropic CEO Dario Amodei earned 70 million social media views warning that frontier AI development is moving too fast to control. As Anthropic increases its probability of doom to pitch investors, tech and AI executives disclosed some of the year’s largest stock sales.

Meta Chief Product Officer Christopher Cox sold $13 million last week, while CrowdStrike CEO George Kurtz sold $4.2 million on September 9 and 10. Datadog CEO Olivier Pomel sold $18.6 million on September 8, and Cloudflare president Michelle Zatlyn sold $27.7 million from September 3 to 8.

NVIDIA director Mark Stevens sold 1,848,501 shares for roughly $411 million over three trading days, beating the prior Nvidia insider selling record by 74%. He then proposed selling up to $1 billion more.

During the first half of 2026, insiders across all public sectors sold $77.6 billion worth of stock yet bought only $6.9 billion, a 1:11 buy:sell ratio. This was worse than the 1:9.7 ratio in the first half of 2025.

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“It’s my worry that in 6-12 months such a swarm could be capable of taking over the entire internet with a persistent botnet,” Amodei wrote in his viral essay, prompting calls for a 10% drop in AI stocks. He pleaded, “We must slow the pace at which we improve the capabilities of AI models.”

Nobody mentioned broke insider trading rules, as sales accompanied public SEC filings. Nevertheless, those with the best view inside public companies converted equity into cash at a nearly 10-to-1 clip relative to buys last month.

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