IBM trims 2026 outlook after Q2 mainframe slump

IBM reduced its full-year 2026 revenue growth forecast to a range of 4% to 5%, down from a prior projection of more than 5%. The revised guidance was announced on July 22, 2026, alongside the company’s second-quarter results. The change reflects softer-than-anticipated performance in parts of IBM’s business, particularly its mainframe operations.

The updated outlook comes at a time when investors were already focused on the company’s growth trajectory. Earlier in July, IBM had issued a preliminary earnings warning that led to a sharp one-day share-price decline of about 25%. The formal cut to the revenue target has added to concerns about the pace of the company’s expansion.

For the second quarter of 2026, IBM reported revenue of $17.16 billion, an increase of 1% compared with the same period a year earlier. Despite the year-over-year growth, the figure fell short of the LSEG consensus estimate of $17.58 billion. The shortfall underlined the pressures in key parts of IBM’s portfolio.

Management highlighted that weaker performance in specific segments weighed on overall results. The underperformance tied directly into the company’s decision to reset its full-year revenue growth ambitions to a more modest range.

Infrastructure revenue declined 7% in the quarter to $3.84 billion, reflecting a broad slowdown in that part of the business. Within infrastructure, IBM Z mainframe revenue fell 42% year-over-year, representing a significant drag on overall growth. These figures underscore the scale of the challenge in IBM’s traditional hardware franchise.

CEO Arvind Krishna pointed to worse-than-planned sales of Z mainframe computers and transaction-processing software as key reasons for the quarterly shortfall. He also noted that some organizations had rushed to purchase hardware ahead of anticipated price increases, affecting the timing of demand. This shift in purchasing patterns contributed to weaker near-term mainframe revenue.

IBM’s shares had already plunged sharply earlier in July following the preliminary earnings warning, and the formal guidance cut and detailed results have kept sentiment under pressure. The combination of a revenue miss, a lower growth outlook, and pronounced mainframe weakness has raised questions about the durability of recent growth trends.

At the same time, customers have been adjusting their spending toward other types of technology infrastructure. IBM has observed shifts in client budgets toward servers, storage, networking and other systems supporting newer workloads, including artificial intelligence. This changing mix of demand has created near-term headwinds for mainframe and related software sales, even as it reflects evolving enterprise technology priorities.