API Data Show Steep Weekly Build in US Crude Stocks While Cushing Drawdown Continues

The American Petroleum Institute (API), an industry group whose weekly tallies offer an early read on US oil stockpiles ahead of official government figures, estimated that domestic crude inventories climbed by 7.14 million barrels in the week ending September 11. That marks a sharp reversal from the prior week, when the API recorded a modest draw of 300,000 barrels.

The broader picture remains one of sustained tightening. According to the API’s data, commercial crude stocks excluding the Strategic Petroleum Reserve (SPR) — the government’s emergency stockpile — have declined by just over 41 million barrels across the past 22 weeks. Even so, inventories remain up nearly 10 million barrels year to date, a figure kept lower by continued releases from the SPR.

Those government drawdowns continued through the most recent reporting week, with another 400,000 barrels leaving the SPR, per the release. SPR withdrawals have effectively offset some of the cumulative decline in commercial holdings, smoothing overall supply levels even as commercial stocks trend lower.

The report’s headline also points to ongoing declines at Cushing, Oklahoma, the delivery hub for benchmark US crude futures and a key gauge of physical market tightness. Continued stock reductions at the hub are closely tracked by traders because falling Cushing levels can signal tightening supply in the heart of the US pipeline network — the midstream infrastructure that moves crude from producing regions to refineries downstream.

A build of this size in a single week stands out against the multi-month drawdown trend, though weekly API figures are estimates and can be revised. Market participants typically compare them with the US Energy Information Administration’s official weekly data for confirmation.

Broader energy markets showed mixed movement, with utilities also in focus. American States Water (AWR) traded at $86.45, down 0.77% from its previous close of $87.12, giving the company a market capitalization of roughly $3.43 billion.

Inventory data are a core input for gauging the balance between US production, refinery demand, and imports. The divergence between falling commercial stocks and ongoing SPR releases continues to shape how analysts interpret headline inventory levels.

Source: original release

What to watch

• The US Energy Information Administration’s official weekly petroleum status report for confirmation of the API’s estimate.
• Next week’s API figures to see whether the build signals a trend reversal or a one-week anomaly.
• Continued SPR withdrawal volumes and their effect on year-to-date inventory comparisons.
• Cushing, Oklahoma stock levels, given their role in tracking physical supply at the US futures delivery hub.