Iran-US War Talks Rattle Oil Markets, Hit Mexico Stocks
Escalating US-Iran military tensions drove Mexico’s benchmark S&P/BMV IPC down 0.40% to 68,128.22 units on May 19, with mining stocks, including Industrias Peñoles, Grupo México, and Orbia, posting the steepest losses as Brent crude held at US$110.26/b. The conflict’s threat to Strait of Hormuz transit, through which a significant share of global oil supply flows, is amplifying inflation and monetary policy uncertainty for Mexico’s import-dependent industrial and energy sectors. Investors are monitoring peace negotiations closely, as a breakdown could trigger further oil price spikes and sustained pressure on Mexican equities and input costs.
Mexico’s stock markets fell on May 19 as investors weighed the prospect of renewed US military strikes on Iran, with oil prices and peace negotiations keeping risk appetite in check across global markets.
The S&P/BMV IPC, the Mexican Stock Exchange’s benchmark index, dropped 0.40% to 68,128.22 units. The FTSE BIVA index on the Institutional Stock Exchange lost 0.42% to 1,365.18 units. Mining stocks led declines within the benchmark, with Industrias Peñoles falling 3.48% to 918.51 pesos, Grupo México down 1.86% to 196.88 pesos, and Orbia losing 1.44% to 21.85 pesos.
The session followed two days of heavy losses driven by oil price-linked inflation concerns and their implications for monetary policy. The retreat came despite a partial recovery on May 18, when markets stabilized on comments from President Donald Trump suggesting a peace deal with Iran was within reach.
“The S&P/BMV IPC managed to stabilize yesterday after two negative sessions. Even so, the index remains below its one-month moving average. Technical signals remain weak, but the dividend payment period could provide support,” said CopKapital.
Trump Signals Imminent Strike Deadline
Trump raised the stakes on May 19, telling reporters at the White House that he had been an hour away from ordering a new strike on Iran before standing down. “I was an hour away from making the decision to go today,” Trump said.
He set a narrow window for diplomacy to succeed, warning that a new attack could come within days if no agreement was reached. “Well, I mean, I am saying two or three days, maybe Friday, Saturday, Sunday, something, maybe early next week, a limited period of time, because we can’t let them have a new nuclear weapon,” Trump said.
The remarks came a day after Trump told reporters that a negotiated outcome remained possible. “There seems to be a very good chance that they can work something out. If we can do that without bombing the hell out of them, I would be very happy,” he said.
Brent crude traded at US$110.26/b, down 1.64% on the day, after easing following Trump’s comments, a sign markets interpreted his remarks as leaving diplomatic space open despite the escalatory tone.
Peace Talks at a Critical Juncture
US Vice President JD Vance said Washington and Tehran had made progress in their talks and that neither side wanted to see a resumption of the military campaign. Iran’s latest peace proposal, as described by Iranian state media, calls for an end to hostilities on all fronts including Lebanon, the withdrawal of US forces from areas near Iran, and reparations for destruction caused by US-Israeli strikes.
Tehran also sought the lifting of sanctions, the release of frozen funds, and an end to the US marine blockade, according to Deputy Foreign Minister Kazem Gharibabadi, as cited by IRNA news agency. The terms appeared broadly similar to a previous Iranian offer that Trump rejected last week.
Pakistan, which hosted the only round of direct peace talks last month and has been conveying messages between the two sides, confirmed it had shared Iran’s latest proposal with Washington. A Pakistani source said the sides “keep changing their goalposts,” adding: “We do not have much time.”
In Tehran, Ebrahim Azizi, Head Iranian parliament’s national security committee, said on X that Trump had paused the attack after recognizing that any strike would mean “facing a decisive military response.”
Strait of Hormuz Remains Central
Control of the Strait of Hormuz remains at the center of the conflict’s economic stakes. US Secretary of State Marco Rubio and UN Secretary-General António Guterres discussed American efforts to prevent Iran from placing mines and imposing tolls in the waterway, including the possibility of a UN Security Council resolution on the issue. Rubio emphasized the “overwhelming support of a broad base of UN members” for those efforts, according to State Department spokesman Tommy Pigott.
The strait’s status has direct relevance for energy-dependent economies. South Korea, one of the region’s largest oil importers, depends on the Middle East for 70% of its crude oil imports, with 60% of that volume transiting through Hormuz, a supply chain vulnerability that has intensified pressure on governments across Asia to accelerate energy diversification.
The US-Israeli bombing campaign, which began in late February, killed thousands of people in Iran before a ceasefire took hold in early April. The ceasefire has held largely, though drones have been launched from Iraq toward Gulf countries including Saudi Arabia and Kuwait, apparently by Iran and its allies. Iranian strikes on Israel and neighboring Gulf states have killed dozens of people.
Trump imposed additional sanctions on May 19 on an Iranian foreign currency exchange house and what the administration described as front companies overseeing transactions on behalf of Iranian banks, signaling continued economic pressure alongside the military threat.
The war has yet to deprive Iran of its stockpile of near-weapons-grade enriched uranium or its capacity to threaten neighbors with missiles, drones, and proxy forces, the stated objectives that Trump and Israeli Prime Minister Benjamin Netanyahu cited when they launched the campaign.
