Houthi territorial gains in early September 2026, including the capture of Mokha port and Perim Island at the Bab al-Mandab Strait, have intensified pressure on Red Sea shipping lanes that handle roughly 10-12% of global trade and serve as a key alternative route for Saudi crude after disruptions at the Strait of Hormuz. These advances, paired with resumed missile and drone strikes on vessels such as the Saudi-linked Amzan tanker in August, have pushed Brent crude above $100 per barrel, elevated war-risk insurance premiums, and prompted carriers to divert tonnage around the Cape of Good Hope, reducing daily transits through the strait. Saudi output fell to 6.238 million barrels per day in August amid pipeline attacks and rerouting, while market-implied odds on Polymarket reflect trader focus on whether further kinetic strikes on commercial ships will occur before specific resolution dates. Key upcoming catalysts include ongoing Houthi enforcement of their July blockade targeting Saudi-affiliated vessels, potential Saudi or coalition responses, and monthly UN reports tracking merchant vessel incidents through January 2027.