Over 116 companies and entities—including OpenAI, Anthropic, Microsoft, and Advanced Micro Devices—signed a letter Thursday urging businesses and policymakers to prioritize cybersecurity as artificial intelligence capabilities enable faster, more sophisticated attacks.

The signatories, spanning cybersecurity vendors, financial services, semiconductors, and cloud providers, called for organizations to upgrade defense tools and use a mix of low-cost and frontier AI models to counter emerging threats. The group also advocated for coordinated government funding to improve cyber defenses at under-resourced critical infrastructure like hospitals and water treatment plants, frequent targets for sophisticated attacks.

The urgency reflects a shift in the threat landscape. AI models can now orchestrate what the industry calls "agentic attacks" in minutes—autonomous assaults that chain together multiple steps without human intervention. A recent breach at open-source platform Hugging Face, attributed to compromised OpenAI credentials, illustrated the real-world risk.

Market valuations have surged in response. CrowdStrike and Palo Alto Networks have more than doubled their market capitalization over the past year. On Thursday alone, shares of CrowdStrike and Okta jumped double-digit percentages following strong earnings reports, with executives crediting momentum in AI security services.

The valuations reflect genuine demand: enterprises are building new defenses against AI-enabled threats and paying for it. But skepticism persists about whether industry letters drive actual change. Mike Dudas, a closely followed tech investor, said the letter may be little more than theater. "I would say we should be petrified," he said. "No, I don't think that anything is going to have any impact."

The signatories themselves acknowledged a narrow window to act, framing the challenge as time-sensitive.