U.S. crude oil stockpiles excluding the Strategic Petroleum Reserve increased by 3.5 million barrels last week, according to government data. This rise exceeded analysts' expectations of a 1.6 million barrel increase, marking a significant deviation from forecasts.

Energy markets had been anticipating a more modest build in inventories. The larger-than-expected increase suggests stronger supply conditions or weaker demand than previously estimated. Such inventory data directly impacts oil price movements and trading strategies.

The unexpected inventory build could signal shifting dynamics in the oil market. Traders and analysts will closely monitor whether this trend continues in upcoming reports, as inventory levels remain a key indicator of market balance.