Every Anthropic Launch Is Now a Market Wipeout Event

Since February, Anthropic has turned product launches into sector wipeouts on a near-monthly cadence. The Claude Cowork plugins (Feb 3) wiped $285 billion from SaaS stocks in a single session — Thomson Reuters -18%, LegalZoom -19%, WPP -12% — by automating legal review, financial analysis, and ad workflows. Claude Opus 4.6 followed two days later with autonomous agent-teams capabilities, hammering Salesforce (-26%) and Workday as markets repriced enterprise software.

The most dramatic hit: Claude Code's COBOL modernization announcement (Feb 23) sent IBM down 13.2% — its worst single day in 25 years — erasing $30B+ from the company whose mainframe consulting business owns COBOL modernization. Then a Claude Mythos data leak (March 27) — Anthropic accidentally exposed internal CMS assets describing their most powerful model yet — sent CrowdStrike, Palo Alto, and Zscaler sliding as markets absorbed what autonomous AI-level threat detection means for enterprise security contracts.

Why it matters: Markets aren't just reacting to AI hype anymore — they're repricing entire high-margin professional services verticals each time Anthropic ships, and the cadence is accelerating.