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Cybersecurity Stocks Plummet Amid Anthropic's Risky AI Leak

3/28/2026

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Summary

Story summary

On March 27, 2026, cybersecurity stocks fell after reports that Anthropic, an AI startup, is testing Mythos, a model with cyber capabilities and security risks.
The iShares Cybersecurity ETF dropped 4.5%, while CrowdStrike and Palo Alto Networks fell about 6%.
Anthropic's data leak, attributed to human error, revealed Mythos details and an upcoming CEO retreat, with the firm remaining cautious about rollout due to potential misuse.

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Story summary

On March 27, 2026, cybersecurity stocks fell after reports that Anthropic, an AI startup, is testing Mythos, a model with cyber capabilities and security risks.
The iShares Cybersecurity ETF dropped 4.5%, while CrowdStrike and Palo Alto Networks fell about 6%.
Anthropic's data leak, attributed to human error, revealed Mythos details and an upcoming CEO retreat, with the firm remaining cautious about rollout due to potential misuse.