A private survey by the American Petroleum Institute (API) has reported a large build in crude oil stock, contrary to an anticipated draw. Expectations had centred around a decrease of 2.1 million barrels for crude, a reduction of 0.3 million barrels for distillates, and a decline of 1.5 million barrels for gasoline.
This survey compiles data from oil storage facilities and companies. The official government data, due on Wednesday morning, will be released by the US Energy Information Administration (EIA). Unlike the API report, the EIA provides detailed statistics on inputs and outputs from refineries and storage levels for different crude oil grades.
Eia Report Versus Api Survey
The EIA report collects data from the Department of Energy and other government bodies. It is generally regarded as more accurate and comprehensive than the API survey. While the API gives a snapshot of total crude storage and changes from the previous week, the EIA offers broader insights into the oil market’s status.
For derivative traders, the divergence between the private API data and the upcoming government EIA report introduces a measurable source of volatility that we believe requires positioning with care. The API’s stated inventory rise directly challenges common market expectations, reflecting 3.03 million barrels added last week when most forecasts leaned towards a reduction. This level of deviation, especially in crude oil balances, often triggers short-term shifts in price momentum, with immediate implications for futures spreads and calendar structure.
Wall Street’s consensus had baked in tighter supply assumptions—smaller inventories typically lead to higher prices because they suggest stronger demand or restricted supply. So, when a build arises instead, that logic is reversed. Prices then tend to drop, as larger stockpiles hint at softer consumption or intensified production, neither of which support the bullish case.
Impact On Derivative Traders And Market Dynamics
Inventory builds of this scale particularly matter near contract rollover periods. Wider contango—or a steeper difference between near-term and later-dated futures—can pressure those holding long positions, especially if their entries had leaned on backwardation bets. Depending on what the EIA confirms or contradicts tomorrow, we expect a firmer realignment in open interest across expiry curves.
For traders situated in product-linked derivatives, the numbers on gasoline and distillate movement carry their own consequences. Inventories of those components also came in above expectations—gasoline, for example, showed an increase instead of the forecast drop of 1.5 million barrels. That figure matters because it often reflects real-time seasonal demand—think summer driving season or heating in winter. Higher stocks here, at the onset of peak consumption months, increase downside risks for crack spreads. Positions tied to refinery margins may thus need rebalancing if government data echoes the early indications.
The survey process behind the API report, while useful, lacks the granularity of the EIA’s figures. That discrepancy often leads spot and futures prices to respond more forcefully once EIA numbers emerge, especially if they diverge again. The gap in methodology is material—API aggregates voluntary data submissions from private firms; the EIA uses systematic collection. We are watching for revisions in refinery utilisation rates, export flows, and regional stock shifts. Those fields drive more detailed conclusions about supply tightness or slack, which correlate more directly with derivatives pricing.
We are therefore adjusting implied volatility expectations, particularly over the 48-hour window surrounding the EIA’s release. Traders holding short-dated options and straddles may want to increase hedges or roll exposure, given the sharpness with which the market tends to recalibrate once validated data becomes available. We are also noting whether any Gulf Coast or Cushing-specific metrics point to logistical easing or constraint—either outcome informing basis trade decisions.
Ultimately, if the EIA contradicts the API again in magnitude or direction, countertrend moves could accelerate. It’s not about whether the market was right beforehand but how swiftly it reacts when the facts shift.
