MPC Markets Morning Call — 21 July 2026: Stocks Slide as Iran War Widens and Oil Spikes Back Above $90
US airstrikes on Iran hit a tenth straight day with three soldiers dead and Houthis threatening a Saudi Red Sea blockade. Brent crude breached $90, the S&P 500 slipped 0.2%, and UK gilt yields surged after PM Burnham’s surprise Chancellor pick rattled markets.
The US-Iran conflict widened sharply on Monday with a tenth straight day of American airstrikes, three US soldiers now confirmed dead, and Houthi militants threatening a Red Sea blockade of Saudi Arabia. Brent crude breached $90 a barrel for the first time since early June before settling back, while WTI closed at $82.98. The S&P 500 slipped 0.2% to 7,445.94 and the Dow dropped 0.6% to 51,841.28, though the Nasdaq held roughly flat. UK gilts sold off hard after new PM Andy Burnham surprised markets with his choice of Chancellor, pushing the 10-year yield 8 basis points higher to 5.03%. Chip stocks bounced modestly from bear-market territory with the Philly Semiconductor Index up 0.6%, but the real test comes this week when Alphabet and Tesla report. ASX 200 futures point to a soft open, down 36 points to 8,717.
The S&P 500 fell 0.2% to 7,445.94, the Dow shed 0.6% to 51,841.28, and the Nasdaq Composite dipped 0.1% to 25,508.07 as eight of eleven sectors closed lower.
The US struck Iran for a tenth consecutive day after three American soldiers were killed, with Trump vowing Tehran “will pay” and Houthis threatening to blockade Saudi Red Sea shipping.
Brent crude spiked above $90 a barrel before pulling back, WTI settled at $82.98 (+0.6%), and US gasoline prices climbed back above $4 a gallon.
UK gilt yields surged 8 basis points to 5.03% after Andy Burnham named John Healey as Chancellor, wrong-footing a market that had priced in Shabana Mahmood.
AMD jumped 5% on a major Microsoft Azure AI infrastructure deal, while China’s Moonshot unveiled its 2.8-trillion-parameter Kimi K3 model, rated just behind Anthropic’s Claude Fable 5 and OpenAI’s GPT-5.6.
ASX 200 futures fell 36 points (0.4%) to 8,717, with New Zealand Q2 CPI due at 8:45am AEST and geopolitical risk likely to weigh on energy-sensitive sectors.
Equities: Chip Bounce Can’t Save a Weak Tape
Wall Street opened with some promise on Monday morning and promptly gave it all back. The S&P 500 closed 0.2% lower at 7,445.94, the Dow shed 0.6% to 51,841.28, and the Nasdaq Composite managed only a marginal 0.1% decline to 25,508.07. Eight of the eleven S&P sectors finished in the red. Healthcare and materials led the losses, each down around 1%, while communications services eked out a 0.7% gain.
The Philadelphia Semiconductor Index bounced 0.6% after falling into bear-market territory last week, down 20% from its June highs. Marvell was one of the top percentage gainers on the Nasdaq. But the mood was cautious. Goldman Sachs’ Prime Services desk, led by Vincent Lin, flagged that hedge funds have pulled back from US tech stocks at a record pace over the past two months. “The persistence and magnitude of selling since early June point to significant length reduction by tech investors, and some signs of capitulation are starting to emerge,” the desk wrote.
The week ahead is where things get interesting. Alphabet and Tesla report Wednesday, followed by Microsoft, Meta, Apple and Amazon the week after. The market wants to see that AI capex is generating actual returns. “For stocks to rebound, we need some solid earnings from the key tech names this week, and de-escalation in Iran wouldn’t hurt,” said Tom Essaye at The Sevens Report. José Torres at Interactive Brokers put it more bluntly: “The stakes are in the nosebleeds, as many businesses are going all in on AI, engaging in heavy borrowing, secondary equity offerings and free cash flow depletions to incrementally scale operations.”
Iran War Widens: Tenth Day of Strikes, Three US Dead, Houthis Threaten Saudi Blockade
Whatever was left of the June ceasefire is gone. The US military hit Iranian targets for a tenth straight day on Monday after President Trump vowed that Iran “will pay for that killing many times over” following the deaths of three American service members in Iraq and Jordan. Iran’s President Masoud Pezeshkian told the Supreme Judicial Council that Tehran was now engaged in a “full-scale war” with the United States. That’s about as unambiguous as it gets.
Traffic through the Strait of Hormuz has slowed to a trickle. Kpler data showed only 30 verified vessel crossings over the weekend. A tanker caught fire off the coast of Oman on Monday, close to a route Iran has warned ships not to take. And then the Houthis piled on: Yahya Saree, the group’s spokesman, announced they would impose a maritime blockade on Saudi Arabia in the Red Sea, putting millions of barrels of Saudi crude exports at risk.
Mediators are still trying. Qatar and Pakistan see a return to pre-July 9 positions as the first step, and Iran’s foreign ministry spokesman confirmed “ideas from some mediators have been conveyed” to Tehran. Secretary of State Marco Rubio said Iran continues to send signals it wants to talk. But a US official told Reuters that Trump is focused on punishing Iran for Hormuz, and strikes will continue until the president decides otherwise.
Meanwhile, Britain got its seventh prime minister in a decade. Andy Burnham replaced Keir Starmer on Monday, promising “the biggest changes in 40 years.” Markets were prepared for that. What they weren’t prepared for was his choice of Chancellor: John Healey, the former defence minister, instead of the widely expected Shabana Mahmood. Sterling dipped and 10-year gilt yields jumped 8 basis points back above 5.00%. More defence spending seems likely. Whether that comes at the expense of health and welfare is the question nobody in Whitehall wants to answer yet.
“Market uncertainty is once again looming — in large part because of renewed tensions in the Middle East. Ongoing missile strikes in Iran are doing little to reassure the market that a permanent resolution to the conflict is near, and without steps to fully reopen the Strait of Hormuz in place, it’s no wonder investors are wary. It’s not immediately clear where the US economy is headed, and with so little information to go on, it’s no surprise that earnings are set to be the deciding factor.”
Energy, Commodities & FX: Brent Hits $90, Gold Hugs $4,000
Brent crude punched above $90 a barrel on Monday for the first time since early June before settling back. WTI closed at $82.98, up 0.6%, after touching a session high of $84.59. The proximate cause: the Houthi blockade threat layered on top of an already dire Hormuz situation. US average gasoline prices climbed back above $4 a gallon according to AAA, bad timing for a White House heading into midterm season and a Fed that thought it had some breathing room after soft CPI and PPI prints last week.
Several Fed officials last week — Beth Hammack, Lorie Logan, Jeffrey Schmid and Philip Jefferson — warned that inflation dynamics still point towards higher rates. Futures markets now price a two-thirds chance the Fed raises rates by September. The 10-year Treasury yield rose 4 basis points to 4.59%, Germany’s 10-year added 2 basis points to 3.15%, and the UK 10-year surged 8 basis points to 5.03% on the Burnham-Healey surprise.
Spot gold slipped 0.2% to $4,008.48, still clinging to the $4,000 handle. The Bloomberg Dollar Spot Index was flat, though the dollar gained broadly against G10 currencies. The euro fell 0.2% to $1.1416, sterling dipped 0.1% to $1.3435, and the yen was unchanged at ¥162.49. Emerging market currencies fared better, with the Brazilian real, Mexican peso and Korean won all gaining 0.5% or more against the greenback. Bitcoin added 0.8% to $65,035.77.
Corporate & AI: AMD Scores Azure Deal, Moonshot Shakes Up the AI Race
AMD shares jumped 5% after Microsoft locked in a wide-scale deployment of AMD’s Helios Rackscale Solution across Azure, putting AMD’s Instinct MI455X GPUs, 6th Gen EPYC “Venice” CPUs and Pensando networking at the centre of Azure’s AI inference stack. Two new VM lines are coming: HDv2 for agentic AI workloads and HXv2 for semiconductor design. Lisa Su called it an extension of a partnership built “across the full stack of AMD AI solutions on Azure.” Microsoft itself rose 2%.
In other corporate news, a federal judge temporarily paused Paramount Skydance’s $110 billion takeover of Warner Bros. Discovery, calling it “likely” in violation of antitrust law. A hearing is set for August 3. BlackRock is looking to sell more than $12 billion of bonds to finance a Meta data center campus in El Paso. And Michael Burry pushed back on reports he’d exited his Oracle short, clarifying on X: “This is fake news. I covered half because winning.” Oracle hit a 52-week low of $121.50 on Friday, down roughly 63% from its all-time high. S&P Global cut Oracle’s credit rating to BBB- on July 9, one notch above junk.
The bigger story for the AI race came from Shanghai. Moonshot’s Kimi K3, a 2.8-trillion-parameter model, is now rated just behind Anthropic’s Claude Fable 5 and OpenAI’s GPT-5.6 on overall capability according to Artificial Analysis. Elon Musk called it “impressive.” The startup is finalising a funding round valuing it at more than $30 billion, with a Hong Kong IPO targeted within six months. Deutsche Bank’s Jim Reid noted that Chinese models are being priced at levels comparable to mid-tier US models while delivering near-frontier performance, which “challenges the economics underpinning the current US-led AI stack.” SpaceX, meanwhile, set August 4 for its maiden public earnings report, which triggers the first tranche of insider lock-up expiration: roughly 911 million shares, worth about $109 billion at current prices.
“Chinese models are increasingly being priced at levels broadly comparable to mid-tier US models despite delivering performance that approaches higher-end systems, implying a materially lower cost-to-intelligence ratio. This challenges the economics underpinning the current US-led AI stack, where frontier capability has traditionally been associated with extremely high levels of compute and capital intensity.”
ASX Outlook & Day Ahead
Australian shares are set for a softer open. ASX 200 futures fell 36 points, or 0.4%, to 8,717, tracking the broad Wall Street weakness. Energy stocks will be the ones to watch given the Brent spike, though any benefit from higher oil prices will be offset by the geopolitical risk premium weighing on sentiment more broadly. The AUD was steady with the dollar index flat overnight.
The domestic calendar is light today but the offshore backdrop is noisy. The Iran war remains the dominant variable, and any overnight escalation or de-escalation will set the tone for the open. New Zealand’s Q2 CPI print at 8:45am AEST is the key regional data point.
- ASX 200 Open — Futures point to a 36-point drop to 8,717. Energy names in focus on the Brent spike.
- NZ Q2 CPI (8:45am AEST) — A hot print would reinforce the case for RBNZ caution and ripple through AUD/NZD positioning.
- US June Leading Economic Index — Due tonight. A deterioration would add to the stagflation-lite case that Fed hawks are building.
- UK PM Burnham policy announcements — First full day in office. Markets watching for fiscal signals after the Healey surprise rattled gilts.
- US earnings: Domino’s Pizza, Steel Dynamics, WR Berkley — Not headline names, but consumer and cyclical reads that matter for broader sentiment.
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