Brent Crude Jumps 4% to Near $88 as Traders Warn Global Oil Buffers Are Gone

Brent crude futures jumped more than 4% this week, closing in on $88 a barrel and marking the benchmark's biggest weekly gain since April, according to Bloomberg. The spike followed an Axios report that the Trump administration notified Israel it is deploying additional aerial assets to the Middle East, a move that signals the US military could expand strikes on Iran as soon as this weekend.

Energy traders who spoke with the Financial Times at the end of the week didn't mince words. They warned that slowing tanker traffic through the Strait of Hormuz could trigger a supply crunch worse than the first round of the US-Iran war, because the emergency reserves and stockpiles that softened that earlier disruption are largely gone.

"We've burned through all of the buffers we had. Everything," one trader told the Financial Times. "All of that's now gone."

The numbers back up the alarm. The International Energy Agency said this week that member countries have already released three-quarters of the 400-million-barrel emergency reserve release announced back in March. Amrita Sen, founder of Energy Aspects, noted that heading into the war, global markets held roughly 400 million barrels of excess commercial inventory, not counting government-controlled strategic reserves. "Now we have close to nothing," Sen said, adding that market complacency about a Hormuz shutdown "is being severely tested."

Shipping data backs up the tightening picture. Kpler reported that Strait of Hormuz crossings fell to just eight confirmed transits on July 16, the lowest in three weeks, with seven of those eight using the Iranian route. UBS analyst Henri Patricot wrote in a daily "Hormuz tracker" note that Gulf tanker crossings remain limited and Gulf loadings have pulled back sharply.

Downstream fuel markets are already feeling it. Bloomberg reported the ICE gasoil crack, a key refining margin, closed at its highest level on record, while the Nymex heating oil crack hit its strongest level since March. Traders were also active in Brent put spreads around the low $70s, a sign some in the market are hedging against a sharp reversal even as prices climb, according to Bloomberg's reporting.

Why the Buffer Matters

Strategic petroleum reserves exist for exactly this kind of moment: a geopolitical shock that threatens to choke off supply through a critical chokepoint like the Strait of Hormuz. When those reserves get drawn down before a crisis peaks, governments and markets have less room to absorb a second shock.

The IEA's disclosure that three-quarters of the March release is already spent is the clearest evidence of that shrinking cushion. It explains why traders are reacting to reports of expanded US military posture with a 4% single-week jump in Brent rather than shrugging it off as noise.

A fair skeptic would point out that oil markets have cried wolf before. Prices spike on headlines about Iran, the Strait, or Gulf tensions, and then often retreat once the specific threat fails to materialize or gets walked back diplomatically. The put spread activity around $70 that Bloomberg flagged suggests some traders are betting on exactly that kind of pullback, even as spot prices push toward $88. That's a legitimate hedge against overreaction, not proof the rally is fake.

Still, the reserve math is hard to argue with. Sen's estimate of near-zero excess commercial inventory, combined with the IEA's confirmation of how much of the emergency release has already been tapped, means the market has less room to maneuver than it did during the first phase of the conflict. Kpler's shipping data showing crossings concentrated almost entirely on the Iranian side of the Strait, rather than a broader mix of routes, adds a concrete, trackable signal to the trader warnings rather than just anecdote.

None of the sources here report that US strikes on Iran have actually expanded as of this weekend, only that the administration notified Israel of additional aerial deployments and that expanded strikes could happen "as soon as this weekend," per Axios. That distinction matters. Prices are moving on anticipation and shrinking buffers, not on a confirmed new round of combat.

The next concrete markers to watch: whether Kpler's daily Strait crossing counts recover or fall further, whether the IEA authorizes any additional reserve releases beyond the March allocation, and whether the anticipated US military action materializes this weekend or gets walked back. Any of the three could move Brent sharply in either direction.