The New York Stock Exchange used Anthropic PBC’s Project Glasswing to identify and fix vulnerabilities in its cyber-security systems, Bloomberg Technology reports, citing testimony from NYSE president Lynn Martin to Congress. Martin told the House Financial Services Committee on Wednesday that NYSE was an early participant in Project Glasswing. According to Bloomberg, she said the exchange was able to find “a variety of items” and address them quickly because of the technology. The Bloomberg excerpt does not specify what vulnerabilities were found, how severe they were, or which specific NYSE systems or subsystems were involved. It also does not say whether the work was a test, a continuing use, or part of a broader cyber-security review. What is concrete is the venue and the actor: a major market operator told lawmakers it has used an Anthropic project in a cyber-security context. Based on the available details, the disclosed use case is specific but narrow. Who benefits: Anthropic benefits from a high-profile institutional reference for Project Glasswing. NYSE benefits if the tool helped surface vulnerabilities it could quickly address, though the report does not quantify that effect. Who's exposed: The provided material does not identify any exposed vendor, system, or class of vulnerability.