Brent Crude Jumps Nearly 5% in a Day to Top $87 as Iran Ties Hormuz Reopening to Six Conditions and Houthis Claim Drone Strike on Saudi Jazan Refinery (Monday, August 10, 2026)

By Monday evening, 19 Mordad 1405 (August 10, 2026), Brent crude had jumped nearly 5% to top $87 a barrel. The move traced back to two developments on opposite shores of the Strait of Hormuz: Iran's Supreme National Security Council tied any reopening of the strait to six conditions, including a U.S. troop withdrawal and the lifting of sanctions, while Yemen's Houthis claimed a drone strike on Saudi Aramco's Jazan refinery around the same time.

Background

Oil has had a volatile month. Brent neared $96 on July 23, then sank 6.6% to $90.75 on August 5 as tensions briefly eased, before jumping 4.45% overnight to $87.61 on July 29 (dates as recorded in Sahmino's own market pulse). It closed at $83.15 on Friday, August 7. Per TradingEconomics, Brent climbed above $84 from Monday morning and extended a third straight session of gains; Sahmino's own midday "Market Pulse" from Tehran's bourse likewise tagged the session "Brent back above $80." What is new this evening is the acceleration toward $87 and the clear political and security origin of the move.

Today's Number

At 20:37 Tehran time on Monday, Sahmino's own price board recorded Brent at $87.25, up 4.42% (about $3.70) from the prior close. At roughly the same time, TGJU showed $87.48 (up 4.71%), and Oilprice.com's live chart showed $87.37 (up 4.57%, on an 11-minute delay). All three sources clustered in the $87 to $87.50 range with gains of roughly 4.4% to 4.7%.

Drivers

The first driver was official. Per Oilprice.com, Mohammad Baqer Zolghadr, secretary of Iran's Supreme National Security Council, said over the weekend that the Strait of Hormuz would stay closed until Washington meets six demands: an end to threats and military action, a permanent end to the war, withdrawal of U.S. naval and air forces from around Iran, compensation for war damages, sanctions relief, and the release of Iran's frozen assets. The same report cited shipping data showing only 33 vessels transited Hormuz from Monday through Thursday of the prior week, down from 50 the week before, with just six crude tankers clearing the strait outbound.

The second driver was security related. Per the Straits Times, Yemen's Houthis said on Sunday, August 9 (18 Mordad), that they had struck Saudi Aramco's 400,000 barrel per day Jazan refinery with a drone; Saudi Arabia's energy ministry reported a fire that it said was "contained and extinguished," without confirming the cause. The same refinery had already been knocked offline by a similar attack in late July, with Aramco saying at the time it expected to restore normal operations by mid-August. Separately, per an August 7 Oilprice.com report, the UAE's ADNOC said 15 of its vessels had been struck and that the attacks were having a tangible impact on its regional operations. Taken together, the main Persian Gulf export route (the Strait of Hormuz) on Iran's side, and the alternate Red Sea route (the Jazan refinery and the port of Yanbu) on Yemen's side, are both under pressure at once; Sahmino's Persian edition has previously documented the cost of that pressure in a report on six Saudi tankers rerouted on a 56-day trip around Africa, adding $2 million to $2.5 million per voyage.

A different narrative surfaced the same day: per Ecoiran, an Iranian member of parliament described details of an Iran-Oman understanding under which Iran would control three-quarters of the strait's management during a 30 to 60 day transitional period. That claim has so far come from a single lawmaker citing a single outlet, no Iranian or Omani official body has confirmed it, and it sits awkwardly next to the Security Council's harder line the same week. It should be treated, for now, as an unconfirmed claim, not a finalized agreement.

Outlook

Per Oilprice.com, the market is now facing two very different readings of the same negotiation. Washington, through Vice President JD Vance, says Persian Gulf oil and gas flows will eventually return to pre-war levels and that Iran has promised not to impose transit tolls; Tehran, meanwhile, has laid out heavy political, military and financial conditions that would be politically costly for the Trump administration to accept. Until the two narratives converge, Oilprice.com says, the Strait of Hormuz risk premium will stay embedded in the oil price; that is a market assessment, not a Sahmino forecast.

Bottom Line

Today's jump in Brent should not be read as optimism about an imminent Hormuz reopening. If anything, the market is pricing a harder official Iranian stance and rising insecurity on Yemen's Red Sea coast, not a deal drawing closer. For Iran, that means more dollars per exported barrel, but also higher insurance costs and pricier alternate shipping routes. Notably, Tehran's free market dollar was down 0.27% at 19:59 Tehran time even as Brent rose almost 5%; that divergence, on a day when Tehran's stock index also set a fresh record, suggests Iran's domestic market has not yet fully priced in this evening's oil move.

What to Watch

Three signals will clarify the next move: first, Iran's official response to Washington's more optimistic framing and whether the Security Council softens its six conditions; second, whether the Jazan refinery stays offline for weeks again or Aramco holds its mid-August restart target; third, Hormuz vessel-transit data this week, after last week's drop to 33 vessels marked a multi-week low. Fewer than seven days remain until the end of the initial 60-day window under the Iran-U.S. memorandum, around 25 Mordad (August 16), a deadline the oil market is treating as a real one.