IBM's AI Spending Warning Crashes Stock 25%

IBM just delivered a warning that rattled the entire tech sector, and the message was blunt. Businesses racing to secure AI infrastructure are cutting spending everywhere else, including on IBM's own products. Shares plunged as much as 26% on Tuesday, putting the 115-year-old company on pace for a steeper single-day decline than it suffered during the 1987 Black Monday crash, according to CNN Business's coverage.

CEO Arvind Krishna delivered the warning directly in a letter to investors ahead of IBM's full earnings report scheduled for July 22. "In the last few weeks of June, we saw clients shift their quarterly capex spend toward servers, storage, and memory purchases to secure supply-constrained infrastructure ahead of expected price increases," Krishna wrote, according to Fox Business. "While we anticipated some supply chain related impact in our expectations, we did not anticipate the magnitude of the capex reprioritization."

The weakness centered specifically on IBM's Z mainframe business, the company's high-powered transaction processing systems used by banks and airlines, and its associated software stack. IBM had expected Infrastructure revenue to decline only in the low single digits this year, coming off what Krishna called the strongest start to a mainframe program in the company's history with its new z17 system. Instead, the shortfall was significantly worse than projected, and several large deals IBM had expected to close by quarter-end simply didn't, a pattern echoing broader concerns we've tracked around AI implementation costs crowding out other enterprise technology budgets.

IBM's preliminary numbers landed clearly below Wall Street expectations. The company posted adjusted earnings of $2.93 per share on $17.2 billion in revenue, missing analyst estimates of $3.01 per share and $17.86 billion, according to data compiled by LSEG. Analyst reaction was sharp. Citi's Fatima Boolani wrote that the results "stand to perpetuate 'AI-Loser' fears," while HSBC's Neil Churchill downgraded the stock, quipping he'd "prefer synthetic IBM to the real one."

Krishna also pointed to a second, less obvious factor. IBM said clients were distracted by rapidly evolving, industry-wide cybersecurity concerns tied to advances in AI's ability to discover software vulnerabilities, which paused several deals the company had expected to close. In response, IBM said it had rapidly launched new open-source security software to address the concern directly, an example of how quickly enterprise AI risk considerations are now reshaping technology purchasing decisions across unrelated product categories.

To reassure investors, IBM highlighted its long-term quantum computing investment, more than $10 billion committed to building the first large-scale quantum computer by 2029, alongside expanding AI partnerships including with OpenAI. Analysts note these efforts remain too early-stage to offset near-term weakness in IBM's core software and infrastructure businesses.

I've advised companies across research and advisory, B2B SaaS, and logistics on AI adoption for four years, and IBM's warning is one of the clearest real-world data points yet showing how AI infrastructure spending is reshaping enterprise technology budgets more broadly. When companies redirect capital toward securing supply-constrained servers, storage, and chips ahead of expected price increases, that spending has to come from somewhere else, and IBM's mainframe and software business just showed what that tradeoff looks like in practice.

For business leaders managing their own technology budgets, this is worth watching as a preview of broader enterprise spending patterns. If AI infrastructure procurement continues crowding out other IT categories industry-wide, expect more established technology vendors to report similar unexpected softness in the coming earnings season.

IBM reports full second-quarter earnings on July 22, which will offer a clearer picture of whether this capex reprioritization trend is broadening across the enterprise software sector or remains concentrated in IBM's specific mainframe and transaction processing business. Watch how other enterprise software vendors like ServiceNow, Salesforce, and Oracle address similar dynamics in their own upcoming earnings calls.