Oracle just posted a backlog number so large it reads like a typo. The company’s remaining performance obligations, essentially contracted future revenue, hit $638 billion at the end of its fiscal Q4 2026. That’s up from roughly $138 billion a year ago.

For context, $638 billion is more than the GDP of most countries. It’s also a 363% year-over-year increase, driven almost entirely by AI cloud infrastructure deals. And yet, Oracle’s stock fell 7-10% in after-hours trading.

The numbers behind the AI gold rush

Oracle reported Q4 FY2026 revenue of $19.2 billion, a 21% bump from the same period last year. Oracle Cloud Infrastructure, the company’s bet on becoming an AI computing backbone, grew at a blistering 93%.

The RPO figure grew by $85 billion just from the prior quarter, when it stood at $553 billion.

Oracle’s management said roughly 12% of that $638 billion would convert to actual revenue over the next 12 months. In English: about $76 billion of that backlog is expected to show up as real money in the near term. The rest stretches out over multiple years.

Over half of the total RPO is reportedly tied to a multiyear agreement with OpenAI. Approximately $75 billion of the backlog includes customer prepayments for GPUs and customer-supplied hardware baked into these AI deals.

Oracle reaffirmed its revenue target of $90 billion for fiscal year 2027.

Why the stock dropped anyway

Oracle’s capital expenditures hit $55.7 billion for the full fiscal year. The company also announced plans to raise approximately $40 billion through a combination of debt and equity to keep funding its data center expansion.

Free cash flow went negative during the period. For investors who care about actual cash generation rather than contracted promises, this was the red flag.

The OpenAI factor and competitive positioning

The OpenAI relationship changed Oracle’s narrative in the cloud wars. With more than half of Oracle’s RPO linked to a single customer, the concentration risk is obvious but so is the validation.

OCI’s 93% growth rate outpaces anything the hyperscaler competitors are posting in their cloud divisions.

What this means for investors watching the AI infrastructure boom

Oracle spending $55.7 billion in a single fiscal year on capex, while simultaneously raising $40 billion more, illustrates just how capital-intensive this business has become.

The concentration risk in Oracle’s backlog deserves attention. When a single customer, OpenAI, accounts for more than half of your future contracted revenue, any disruption to that relationship would be seismic.

A 363% increase in backlog is genuinely extraordinary by any historical standard. Converting $638 billion in promises into profitable revenue while managing $55.7 billion in annual capex and $40 billion in new financing is a high-wire act. Oracle’s management clearly believes the AI infrastructure wave justifies the bet.