Equifax (EFX) stock surged 5.00% during intraday trading on Thursday, as investors reacted positively to the company's robust fourth-quarter and full-year 2025 financial results.

The credit reporting agency reported fourth-quarter revenue of $1.55 billion, a 9% increase year-over-year. More significantly, the company announced its full-year 2025 free cash flow reached $1.13 billion, representing a sixfold increase, highlighting strong operational performance and cash generation.

Market analysis suggests the rally may also be fueled by a growing investor view that Equifax's business model is resilient against potential disruption from artificial intelligence. The company derives approximately 90% of its revenue from proprietary data assets like The Work Number, which analysts argue creates a sustainable competitive advantage in an environment where AI is seen as a threat to many information-services firms.