A historically large block trade of Brent crude oil put options surfaced during the early Asian session on May 19th, heightening market anxiety amidst already fragile sentiment. Market data indicates a single block trade executed 134,000 lots of a July expiry Brent crude put spread with strike prices at $91/$90. This position corresponds to an underlying asset volume of 134 million barrels of oil. The buyer of this spread stands to gain approximately $129 million if the July futures contract falls by about 19% from current levels before its expiry on May 26th.
This was not the only notable activity. Subsequently, a 30-million-barrel 92/90 put spread for July contracts traded on the ICE platform at $0.11. A similar 26-million-barrel spread traded on CME Group. In total, put spread-related transactions on Monday alone covered at least 350 million barrels of crude oil.
The timing of this trade is sensitive, occurring just one week before the options' expiry. Market analysts note that call or put spreads with extremely narrow strike ranges are often utilized by institutions to hedge over-the-counter (OTC) binary option trades. Another potential use is hedging event contract trades on prediction market platforms like Kalshi or Polymarket. In essence, this massive transaction likely represents a hedging component for a specific event bet rather than a naked directional speculation.
The timing of these put options is particularly noteworthy. The US-Iran conflict has now entered its 12th week, with markets at a highly sensitive "tipping point." On May 18th, tensions escalated as former President Trump issued a social media ultimatum to Iran, stating it would "have nothing" if it did not act quickly, and planned discussions with his national security team on military options. Iran responded with six counter-demands and announced a new mechanism for managing navigation in the Strait of Hormuz.
The Strait of Hormuz is a critical chokepoint for global oil shipments, with about 20% of the world's supply transiting through it. Despite ongoing hostilities, traders have continued to price in the possibility of a sudden de-escalation, including a potential agreement to reopen the strait. The call skew—the premium traders are willing to pay to bet on further price increases—has narrowed to its lowest level since the conflict began, indicating waning market confidence in sustained price gains.
On May 19th, international oil prices closed lower. Brent crude futures fell 0.82% to settle at $111.28 per barrel, while WTI crude fell 0.82% to $107.77 per barrel. This followed a 2.6% surge in Brent to above $112.10 on the previous trading day, boosted by Trump's ultimatum. The sharp reversal from gains to losses within 24 hours has prompted market participants to question the rationale behind such a large bearish bet at a time when prices seemed prone to rise.
This massive trade appears against a concerning backdrop: the U.S. Department of Justice is reportedly investigating several precisely-timed crude oil trades. In collaboration with the Commodity Futures Trading Commission (CFTC), it is probing at least four suspicious trades placed just before major announcements by Trump or Iranian officials, involving over $2.6 billion. A key signal is that market confidence is eroding even as the investigation remains ongoing and inconclusive. Trader reports indicate declining faith in the fairness of oil trading. When investors suspect information asymmetry behind large trades, risk management logic and positioning are forced to adjust, further amplifying safe-haven sentiment in an already volatile geopolitical environment.
From a quantitative perspective, this put option trade is not an isolated event but aligns with broader structural shifts in the options market. Data from options analytics platform OptionStrat shows that the Volatility Risk Premium (VRP) for both Brent and WTI crude has risen significantly since early May. The VRP for Brent crude is currently 2.6 times its long-term median. The VRP, calculated as Implied Volatility minus Realized Volatility, is a core metric for gauging the market's pricing of future tail risks. Its sharp increase suggests the options market has "priced in" a black swan event—whether an escalation to war or a ceasefire—implying an expectation of a sharp, unpredictable one-way move in oil prices. Monday's massive put spread trade, executed within this elevated risk premium environment, points to market participants collectively "buying insurance for a decline."
As of this report, neither the U.S. Department of Justice nor the CFTC has commented on the investigations. It is important to note that the trading data disclosed by LSEG records only the time and size of transactions, not the identities of the parties involved, and does not constitute proof of insider trading.
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