Staff reportersUpdated July 21, 2026 — 10:23am,first published July 21, 2026 — 5:19amThe Australian sharemarket opened lower on Tuesday as an escalation in Middle East hostilities rekindled worries about inflation, with oil prices near their highest level since mid-June.The S&P/ASX 200 was down 56 points, or 0.6 per cent, at 8735.30 as of 10.17am AEST. The local market dipped by 0.1 per cent on Monday. The Australian dollar was trading at US69.97¢.AI stocks recovered some of their heavy losses from Friday.BloombergIn a volatile session overnight, US crude settled near $US83. Worries that higher energy costs could boost inflation spurred bond losses and weighed on Wall Street, with the S&P 500 dipping 0.2 per cent, the Dow Jones Industrial Average dropping 0.6 per cent, and the Nasdaq composite finishing basically flat after slipping by less than 0.1 per cent.US President Donald Trump vowed that Iran “will pay” for killing three US soldiers in recent days, even as mediators proposed a new truce. Tensions remained high as Tehran-backed Houthi militants in Yemen threatened to blockade Saudi Arabia in the Red Sea.“The Iran situation continues to roil markets,” said veteran strategist Louis Navellier. “This is holding back the stock gains that should be expected given the strong earnings trends.”This week brings the first results from Big Tech, and pressure is building for the companies to justify AI investments. Tesla and Google parent Alphabet kick off big tech’s reporting season on Wednesday [Thursday morning AEST]. Then, Microsoft, Meta, Apple and Amazon hit the following week.“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. “Markets will want to see strong results and more signs of robust demand, but also evidence of restraint and a focus on stability.”Nvidia added 0.2 per cent overnight and held firmer following its drop on Friday, when it was the heaviest weight on the S&P 500. Sandisk climbed 2.7 per cent after tumbling 29 per cent last week.Advanced Micro Devices rose 1.6 per cent after announcing an expanded partnership where Microsoft will use its products for AI, including its new Helios product starting in the second half of the year.Such stocks have been under pressure for weeks on worries that their prices shot too high in the euphoria around AI. On one hand, companies are making billions of dollars in revenue as customers pour money into AI chips and data centres. But all that spending may fizzle out if AI doesn’t produce as much profit and productivity as promised.All kinds of companies are under pressure to report strong growth in profit early this year. They will need to in order to justify the big moves their stock prices have made. Indexes are near their records, even with the recent shakiness for AI stocks.AMC Entertainment jumped 26.8 per cent after the movie-theatre operator reported stronger revenue for the latest quarter than analysts expected. It also said some of its theatres in Los Angeles and other cities ran The Odyssey for more than 85 straight hours from Thursday through Sunday to meet demand.Domino’s Pizza climbed 2.1 per cent after delivering stronger revenue for the spring than expected. CEO Russell Weiner said the company saw growth in orders for both its carryout and delivery businesses, even with the broad industry continuing “to face pressure on consumer demand.”Another restaurant chain, Jersey Mike’s, is beginning its roadshow to raise interest in its stock, which it’s planning to sell on the New York Stock Exchange for between $US21 and $US25 per share in an initial public offering.It and other businesses are facing pressure in selling to US households feeling crunched by still-high inflation, thanks in large part to high petrol prices. The average cost for a gallon of gasoline in the United States has gotten back above $US4 because of higher crude oil prices.After dropping below $US72 early this month, roughly back to where it was before the war with Iran began, the price for a barrel of Brent crude has been jumping recently as fighting continues in the Middle East. The war with Iran is keeping oil tankers from using the Strait of Hormuz to deliver crude from the Persian Gulf to customers, which pushes up oil’s price.S&P Global counted only 127 vessels crossing the strait during the week through Sunday, down nearly 50 per cent from the week before.Worries about expensive oil and high inflation have sent Treasury yields higher in the bond market, which threaten to slow the economy and undercut prices for stocks and other investments.The yield on the 10-year Treasury climbed to 4.59 per cent from 4.55 per cent late on Friday and from just 3.97 per cent before the war with Iran. Higher yields have already sent the average 30-year mortgage rate to its highest level in nearly a year.The higher yields weighed on the broad US stock market, and the majority of stocks fell on Wall Street.A 3.8 per cent drop for Warner Bros. Discovery also helped erase a gain for the S&P 500 early in the day. A federal judge ordered it and Paramount to halt their $110 billion ($157 billion) merger for at least two weeks, allowing states that are challenging the deal more time to see their case through in court. Paramount Skydance fell 2.1 per cent.In other international markets, indexes ended mixed in Europe.The moves were sharper in Asia, where South Korea’s Kospi fell 4.5 per cent. It’s been at the centre of the huge swings for AI stocks because it’s dominated by two tech companies, Samsung Electronics and SK Hynix.Stocks were stronger in China, where indexes rose 2.4 per cent in Hong Kong and 0.9 per cent in Shanghai.With AP, BloombergThe Market Recap newsletter is a wrap of the day’s trading. Get it each weekday afternoon.From our partners