IBM says AI disrupted mainframe sales, not killing the platform

IBM's stock plunged last week after the company warned of weak mainframe sales, but CEO Arvind Krishna insisted that artificial intelligence is not killing the mainframe. Instead, he said AI is temporarily disrupting corporate hardware budgets as businesses redirect spending toward AI infrastructure.

The warning affected IBM's shareholders, who saw the stock drop sharply, and the broader tech industry, which watches IBM as a bellwether for enterprise hardware demand. The company reported that mainframe revenue fell by a significant margin in the most recent quarter, missing analyst expectations.

This matters because mainframes remain critical for many large banks, airlines, and government agencies that rely on them for high-volume transaction processing. A sustained decline could force those customers to accelerate migration to cloud-based systems, reshaping a multi-billion-dollar market.

Krishna provided specific figures: mainframe revenue declined 34% in the quarter, contributing to an overall revenue miss of about $500 million. The warning came on April 24, when IBM released preliminary first-quarter results ahead of its full earnings report.

IBM had previously invested heavily in its z16 mainframe line, launched in 2022, which was expected to drive a refresh cycle. However, the company now says customers are delaying purchases as they prioritize spending on AI servers and cloud services.

Looking ahead, IBM expects mainframe sales to remain weak for at least the next two quarters as AI budget pressures persist. The company is betting that its own AI platform, Watsonx, will eventually drive demand for mainframes to handle AI workloads, but that shift has not yet materialized.