RIYADH, October 26, 2026: Saudi Arabia’s stock market recorded its worst trading session in 18 months on Sunday as escalating fighting between the kingdom and Yemen’s Iran-aligned Houthis weighed on investor confidence. The decline highlighted growing concern about the potential consequences of prolonged instability for regional businesses and financial markets.
The kingdom’s benchmark Tadawul All Share Index closed 2.7% lower after falling as much as 3.4% during the session. Despite recovering part of its earlier losses, the index remained sharply down at the close. Saudi Aramco shares declined 0.9%, contributing to the market’s retreat.
Security Developments Weigh on Confidence
The sell-off followed further reports of military activity. The Saudi-led coalition said air defences intercepted drones and missiles over Riyadh and southern parts of the kingdom on Sunday. A day earlier, the Houthis claimed attacks on Saudi oil facilities and airports, while the coalition reported intercepting two missiles.
The developments kept attention focused on the security of important commercial infrastructure. For investors, repeated threats to airports, energy facilities and transport routes raise questions about business continuity and the possibility of additional operating costs.
Energy and Transport Risks Remain in Focus
Transport and energy infrastructure are important channels through which regional tensions can affect businesses. Potential disruptions may require shipping companies and airlines to adjust routes, strengthen security arrangements, or absorb higher insurance costs.
Energy markets also remain sensitive to threats against production and export facilities. However, falling share prices reflect changing investor expectations and do not, by themselves, establish that a major interruption to oil supplies has occurred. The market reaction therefore needs to be distinguished from confirmed damage to commercial operations.
Regional Markets Show Mixed Performance
The pressure extended beyond Saudi Arabia. Egypt’s blue-chip index fell 3.6%, recording its largest single-day decline since June 2025, with most constituent Saudi stocks record lower endings.
Qatar moved in the opposite direction, recovering from early losses to close 0.1% higher. The contrasting performances showed that regional markets did not respond uniformly to the deteriorating security environment.
Investors Watch for Diplomatic Progress
Concerns about shipping disruptions and the possibility of renewed US military action also weighed on sentiment. Market participants continued to watch for diplomatic developments that could reduce the risk of a wider confrontation, according to Reuters.
For businesses, the immediate concern is whether heightened security risks translate into sustained disruption, higher costs or delayed activity. Sunday’s sharp decline demonstrated how quickly uncertainty around regional infrastructure and operating conditions can influence equity markets, even before the broader economic impact becomes clear.
