Saudi Arabia’s stock market recorded its worst session in 18 months on Sunday as escalating fighting with Yemen’s Iran-aligned Houthis renewed concerns about regional security, energy infrastructure and shipping routes. The Saudi benchmark index fell 2.7% after dropping as much as 3.4% during the session, while Saudi Aramco lost 0.9%.
The selloff came as Saudi air defences intercepted drones and missiles over Riyadh and southern areas, according to the Saudi-led coalition. A day earlier, the Houthis said they had targeted Saudi oil facilities and airports.
Security risk returned to the centre of market pricing
Gulf markets often benefit from high oil prices, but the relationship changes when those prices are driven by direct security threats to infrastructure or transport routes.
Investors then begin to price in risks to airports, refineries, shipping and domestic business activity rather than simply higher energy revenue.
Saudi shares suffered the steepest losses
The Saudi index closed down 2.7%, its weakest day in about a year and a half. The market had been down more than 3% at one point before recovering some ground.
Heavyweight stocks, including Saudi Aramco, declined as investors reduced exposure to sectors most sensitive to regional escalation.
Qatar recovered while Egypt fell sharply
Qatar’s benchmark reversed early losses and finished slightly higher, showing that the selloff was not uniform across the region.
Egypt’s blue-chip index, however, dropped 3.6%, its largest one-day decline since June 2025. Most major Egyptian shares finished lower.
Shipping routes remain a major concern
The Gulf and Red Sea contain some of the world’s most important energy and trade routes. Any escalation that affects tanker traffic, ports or insurance costs can quickly spread beyond regional markets.
Shipping companies may reroute vessels or pay higher insurance premiums if the threat to commercial traffic increases.
Airports are another economic vulnerability
Recent attacks and threats against Saudi airports have raised questions about aviation risk. Riyadh is trying to expand tourism, conferences and business travel as part of its economic diversification strategy.
Even temporary disruptions could affect airlines, hotels and event attendance.
Oil can support revenue but hurt risk appetite
Saudi Arabia and other Gulf producers benefit fiscally from higher crude prices, especially when production volumes remain stable.
But sharp price spikes caused by conflict can weaken global growth, increase inflation and raise financing costs. That can offset some of the fiscal benefit.
Foreign investors may demand a higher risk premium
Saudi Arabia has spent years opening its capital markets to international investors and encouraging foreign participation in major projects.
If security incidents become frequent, investors may require higher expected returns before committing capital. That can reduce equity valuations and increase the cost of financing.
Aramco remains a key market signal
Saudi Aramco’s share price matters not only because of the company’s size but because it reflects investor confidence in the kingdom’s energy infrastructure.
A sustained decline would suggest concern about production, exports or the broader geopolitical environment.
Diplomacy could reverse the pressure quickly
Gulf markets have often recovered rapidly when security tensions ease. Any ceasefire, diplomatic contact or reduction in attacks could trigger a rebound.
Conversely, another successful strike on major infrastructure could produce a much more severe market response.
The next sessions will test whether this was a shock or a trend
Investors will monitor Saudi airspace, shipping data, oil prices and diplomatic statements for evidence that escalation is either contained or spreading.
Sunday’s decline shows that markets are no longer treating the Saudi-Houthi confrontation as a distant geopolitical issue. It is being priced directly into regional assets.
Sources
- Saudi-led coalition statements
- Reuters market data, Oct. 25, 2026
Oil prices will determine part of the next move
If fighting pushes crude prices sharply higher, Gulf producers could receive more revenue even as equity markets weaken. But a prolonged price spike would also increase inflation and reduce global demand, eventually feeding back into regional growth. Investors therefore watch both the security situation and the shape of the oil curve when deciding whether to buy the dip or reduce exposure further.
Bank shares will be another key indicator. Financial institutions are sensitive to domestic credit growth, property activity and investor confidence. If banks continue to underperform after the immediate security shock fades, that would suggest the market is pricing a broader economic slowdown rather than a temporary geopolitical event.
