CNBC Daily Open: Unstable tariff situation and new AI disruption spark market sell-off

Futures-options traders work on the floor at the New York Stock Exchange's NYSE American (AMEX) in New York City, U.S., February 23, 2026.Investors lost their sense of security in the business of cybersecurity companies after Anthropic on Friday launched Claude Code Security, which it said can scan code for vulnerabilities and suggest solutions. Shares of CrowdStrike, Palo Alto Networks and Cloudflare slumped, but it was IBM that was hit the worst, plunging nearly 13.2%.European markets also had a day in th ...