USO enters May with a rare combination of rising short interest and a rising price — a tension shaped almost entirely by the escalating U.S.-Iran standoff that has gripped oil markets this week.
The fund gained 7.9% over the past week to close at $142.80, yet short sellers added to positions throughout that same stretch. Short interest hit 91.4% of the free float on April 30, up 4.1% from a week earlier. That number looks extreme, but it is typical mechanics for a heavily-traded commodity ETF: creation/redemption cycles and hedging by market makers routinely push ETF short interest well above 50%. What matters more is the direction — and the direction this week was higher, reversing a month-long decline of 12.4% that had eased shorts off their early-April peak near 14.4 million shares.
The lending market reflects genuine demand. Cost to borrow is running around 10.3% — up 39% over the past month — and has been consistently double-digit since mid-April. That is not a negligible carry cost for a short position. Availability has been tight throughout: borrow availability hit fully constrained levels (0% spare capacity) on multiple days in April, including April 28 and 27, before easing slightly to leave roughly 14% headroom by April 30. The ORTEX short score is 71.1, broadly stable over the past two weeks, suggesting this is an established short base holding firm rather than a new wave of conviction.
Options positioning reinforces the defensive lean. The put/call ratio closed at 1.62 on May 1 — nearly 1.75 standard deviations above its 20-day average of 1.51, and the highest reading in the current window. The PCR has been drifting higher since late March, when it troughed near 1.33. That persistent bid for puts tells the same story as cost to borrow: holders of oil exposure are paying up to hedge downside risk, even as the price itself moves higher.
The catalyst is impossible to miss. USO news flow this week was dominated almost entirely by the Iran conflict. Trump's statement that he is "not happy" with Tehran's latest nuclear proposal, the Pentagon's claim that the U.S. blockade has cost Iran $4.8 billion, threats of sanctions on shippers paying Strait of Hormuz tolls, and prediction markets pricing oil above $125 in a prolonged conflict scenario all hit the tape in a single session on May 1. The price fell 2.9% on Friday despite the bullish macro backdrop — a signal that some traders are already taking profits after the week's rally.
Institutional ownership is concentrated in a handful of market-maker and arbitrage accounts, as is standard for commodity ETFs. Goldman Sachs holds 8.4% of shares as of March 31. The insider data in the system is from 2006 and not relevant to the current setup.
The week ahead turns on whether Iran-U.S. negotiations make progress. Trump's scheduled visit to China this month — where the Strait of Hormuz was flagged as a top agenda item by China's U.N. envoy — provides the next hard date for a potential diplomatic pivot. A ceasefire headline would put the current short and options positioning under immediate pressure; a breakdown in talks would reinforce it.
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