This is the private survey ahead of official oil stock data (U.S. Department of Energy's Energy Information Administration's (EIA) Crude Oil Inventories) due from the US on Wednesday morning.

The data gets released privately to subscribers to their service, but it hits media in the seconds and minutes following. ZeroHedge tweeting now:

The build was expected, the first for 11 weeks. But the size of the build is a surprise.

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