US weekly API crude oil stocks rose 6.6M, far above forecasts of a 0.6M decline in March

    by VT Markets
    /
    Mar 18, 2026
    US weekly crude oil stocks, reported by the API, rose by 6.6 million barrels for the week ending 13 March. This was above expectations, which had pointed to a 0.6 million barrel fall.

    Inventory Surprise Signals Bearish Momentum

    The report from last week in 2025, showing a 6.6 million barrel build in crude oil when a small draw was expected, is a strong bearish signal. This massive surprise suggests that supply is overwhelming demand in the market. We should anticipate immediate downward pressure on WTI and Brent crude prices. For derivative traders, this points towards buying put options on crude oil futures. This strategy allows us to profit from a potential drop in price over the next several weeks. We can look at strike prices below key support levels, such as the $75 per barrel mark for WTI, as a potential target. This large inventory build is especially concerning when we consider recent global economic signals from last year. We saw in February 2025 that China’s Caixin Manufacturing PMI registered at 51.6, which, while in expansion territory, was part of a broader global picture of moderating growth. The oversupply in the U.S. hints that this slowdown in demand may be more pronounced than previously thought. We must now watch the official EIA inventory report very closely to confirm the API’s numbers. Historically, while the two reports are correlated, the EIA data is considered the market benchmark. The size of this build also happened during the 2025 refinery maintenance season, which can sometimes inflate crude stock numbers temporarily.

    Key Confirmation And Timing Factors

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