• Commercial crude excluding the SPR rose 3.0 million barrels (0.7%) to 426.39 million barrels in the week to September 18, from 423.42 million a week earlier, per Rigzone's report of the EIA data.
• Stocks sit about 2% above the five-year average and 2.8% above the 414.75 million barrels of a year ago, so the level is elevated but not extreme.
• Cushing stocks rose 2.2 million barrels to 23.7 million, so the national build was not spread evenly across the system.
• Refinery crude runs of 16.8 million barrels per day (94.0% utilization) show demand for crude was strong even as stocks built.
• The SPR fell to 284.6 million barrels, about 29.9% below a year ago, which leaves less emergency cushion than the commercial figure suggests. This is analysis, not trading advice.

US commercial crude stocks grew by 3.0 million barrels in the week ending September 18, reaching 426.39 million barrels, according to Rigzone's report of the EIA weekly data released on September 23, 2026. That leaves inventories about 2% above the five-year average. The build is real but small, and the more telling details sit underneath the headline: refiners ran hard, Cushing filled, and the government reserve kept shrinking. This is analysis, not trading advice.

A 0.7% build with refiners running hard

Commercial crude excluding the SPR rose from 423.42 million barrels on September 11 to 426.39 million on September 18, a 0.7% gain, per Rigzone's report of the EIA figures. Refinery crude runs were 16.8 million barrels per day at 94.0% utilization, with gasoline output at 9.6 million and distillate at 5.2 million barrels per day. Crude was building even with refiners near capacity, so the build reflects supply outrunning that pull, not a demand collapse.

Cushing took most of the build

Stocks at the Cushing hub rose 2.2 million barrels to 23.7 million barrels, according to Rigzone's summary of the EIA data. That is most of the 3.0 million barrel national increase, so inventory outside Cushing was roughly flat on the week. Cushing is the WTI delivery point, so a build there is read as easing prompt tightness in that benchmark. Rounded figures limit the precision of that split, and the picture is one week of data.

The SPR is the larger structural story

The Strategic Petroleum Reserve stood at 284.6 million barrels on September 18, down from 285.0 million a week earlier and about 29.9% below the 406.0 million barrels of a year ago, according to Rigzone's report of the EIA data. Commercial stocks are 2.8% higher year on year, but total US petroleum stocks of 1.535 billion barrels are 152.0 million barrels lower. The country holds a thinner emergency buffer than the commercial number implies.

What this does and does not say about the Gulf

A 3.0 million barrel US build does not by itself measure Gulf supply, and the source data does not identify where US crude imports originated. Rigzone reports crude imports of 5.9 million barrels per day for the week and a four-week average of 6.6 million, 5.3% above the year-ago level. For Brent and Dubai, OPEC+ policy, official Gulf national oil company export data and refining margins remain the more direct drivers. Any tanker-tracking figures should be treated as estimates.

What to watch next

The next EIA weekly report, due after this one, will show whether Cushing keeps filling and whether refinery utilization holds near 94%. A second consecutive build with runs staying high would point to supply running ahead of demand. A draw would suggest this week was noise. Gasoline stocks fell 1.7 million barrels to 206 million barrels and distillates fell 0.4 million to 107.4 million, so product markets are not showing the same slack. This is analysis, not advice.