IBM Cuts Full-Year Revenue Growth Outlook as Mainframe Sales Plunge 42%
Alina Collins
IBM posted Q2 revenue of $17.2 billion, up just 1.2% year-on-year, as mainframe sales plunged 42% and dragged overall growth down by more than 5 percentage points; the company cut its full-year revenue growth guidance to 4%–5%, citing customers shifting budgets toward AI hardware.
How bad was the quarter?
Revenue hit $17.2 billion, up 1.2% year-on-year — roughly $60 million below consensus. Adjusted EPS came in at $2.93, missing the $2.97 analyst estimate.
Full-year revenue growth guidance was cut from "above 5%" to 4%–5%. The midpoint trails the LSEG analyst consensus of 4.8%.
This means → IBM didn't just miss one quarter. It lowered the ceiling for the entire year — and the market's confidence in the second half got marked down with it.
Why did mainframes collapse so suddenly?
The Infrastructure segment posted $3.84 billion in revenue, down 7% year-on-year. Within that, Z-series mainframes — IBM's legacy high-end server line — fell 42% in a single quarter.
CFO James Kavanaugh told Reuters the mainframe drag exceeded 5 percentage points of overall growth, "versus the 1 to 2 points we had originally anticipated."
In plain terms = even IBM didn't see this coming. What they expected to be a mild slowdown turned into an emergency stop.
Where did the money go?
CEO Arvind Krishna attributed the gap to customers redirecting end-of-quarter budgets toward AI-related hardware — servers, storage, memory — locking in purchases ahead of price increases.
Some clients also froze cybersecurity spending decisions, leaving IBM with dozens of unclosed deals in Q2. The company has since recovered roughly one-third.
This reflects a broader industry shift: total enterprise IT budgets aren't growing, but dollars are moving fast from legacy infrastructure toward AI infrastructure.
Why had the stock already crashed before earnings?
On July 14, IBM took the rare step of pre-announcing the shortfall. In a letter to investors, Krishna acknowledged the company "made mistakes."
That letter triggered a 25% single-day drop — the largest in IBM's century-plus history — erasing roughly $67 billion in market cap.
By the time of the formal earnings release, shares had fallen another ~5% from the pre-warning level. This means → the market does not believe the bad news is fully priced in. Skepticism about the second half remains high.
Can IBM turn it around in the second half?
Kavanaugh said there is "no evidence that customers are abandoning mainframes" and expects the mainframe business to improve meaningfully in the back half.
IBM held its full-year free-cash-flow target steady — roughly $1 billion above last year's level.
But the company also conceded that supply-chain tightness in AI infrastructure won't ease soon: "Everyone in the industry is saying this will persist for a while."
In plain terms = IBM's turnaround thesis is that customers delayed, not defected. Whether that holds will depend on second-half mainframe order data — the single most important proof point for the credibility of IBM's full-year guidance.
Content is for reference only, not financial advice.