Oil prices edged upward as market participants weighed a series of Houthi attacks on Saudi Arabia against the broader question of whether hostilities might extend beyond their current boundaries. Brent crude, the international oil benchmark, rose to $US105.10 a barrel, a gain of 0.4 per cent on the session.

On Sunday, Houthi forces launched a fresh wave of strikes against the main airport in Saudi Arabia, one day after an earlier attack left 12 people dead — a development that analysts say raises the possibility of the conflict widening, with potential implications for US involvement, energy markets, and international trade routes. Saudi Arabia's reported backing of a military push near Bab el-Mandeb — a strait through which shipping lanes between Asia and Europe converge — has accompanied a broader intensification of the conflict.

Trading in major currency pairs left the US dollar modestly ahead of its principal counterparts, with the Australian dollar — often treated as a barometer of global risk appetite — holding broadly flat.

Inflation readings due across the US and Europe, alongside a run of central bank appearances, meant financial markets were already facing a packed calendar before the attacks introduced an added layer of uncertainty into the week. Any fresh disruption to energy supplies could feed through to price pressures and reinforce market expectations that interest rates will need to rise, with Nick Twidale, chief market analyst at AT Global Markets in Sydney, noting in a client note that geopolitical developments tend to carry an amplified effect on markets when trading conditions are thin.

With a US inflation reading, multiple central bank speakers, and the opening of another US earnings season all falling within the same week, Twidale noted in writing that markets would have no shortage of data and commentary to absorb.

With incoming US consumer-price figures and a public address by Federal Reserve chair Kevin Warsh both on the calendar this week, market participants are parsing what either development might reveal about the trajectory of borrowing costs. An above-forecast inflation reading for September could place renewed upward pressure on bond yields, given the possibility that the Fed might respond by accelerating the pace of rate increases.

Ten-year Treasury note yields approached 5.4 per cent in the prior week — a threshold last reached in 2002 — as Brent crude held its position above $US100 a barrel, with the two pressures together feeding market anxiety that entrenched energy prices may leave inflation resistant to any near-term retreat.

Stock markets held relatively steady through the period of disruption. After touching a record high on Tuesday, the S&P 500 pulled back over the following two days amid questions about AI demand, then recovered ground by Friday as market participants looked ahead to what they anticipated would be a healthy earnings period. The index sits close to its all-time high.

Market observers are expected to track whether rising input costs are putting pressure on profit margins at a time when corporate earnings have been running at a notably elevated pace. Seven straight quarters of double-digit earnings expansion have built up behind the S&P 500, and data gathered by a major financial intelligence service puts the expected profit gain for the third quarter at around 25 per cent against the same period a year prior.

The dollar held to a narrow trading range against its main peer currencies after notching gains in each of the four preceding weeks — a stretch of consecutive weekly advances not seen since early 2025. Higher oil prices and tensions with Iran drew investors toward the dollar as a haven asset, traders noted, though the precise weight of each factor in driving demand remained a matter of interpretation.

Positioning data from currency markets shows traders with speculative exposure holding net-long dollar positions, on the view that the US economy faces a less adverse path through additional rate tightening than other leading economies do. Budget pressures in France and a sustained rise in energy costs have dragged the euro to its weakest point since May 2025, a move that analysts at Barclays — led by Themistoklis Fiotakis — argued in a client note reflects a broader set of conditions, including stronger US economic performance, limited room for yield reductions, and fiscal and energy vulnerabilities across Europe, that together point toward further gains for the dollar against a backdrop of a 15-month trading range that may be nearing a breakout.

Elevated long positioning at current levels carries the potential to place a ceiling on near-term price gains.