U.S. commercial crude-oil stockpiles increased by 6.2 million barrels last week, according to the latest data. This marked a significant reversal from analyst expectations, which had predicted a modest decline of about 40,000 barrels. The unexpected build in inventories suggests weaker-than-anticipated demand or stronger-than-expected supply.

Market analysts had been forecasting a slight drawdown in crude stocks, making this 6.2 million barrel increase a notable surprise. The data point comes from the Energy Information Administration's weekly petroleum status report, which tracks commercial crude inventories held at refineries and pipeline terminals across the United States.

The inventory build could signal shifting dynamics in the oil market, potentially putting downward pressure on crude prices. Traders and investors will be watching closely to see if this trend continues in the coming weeks, as inventory levels are a key indicator of supply-demand balance in the energy markets.