Houthi territorial gains around the Bab el-Mandeb Strait in early-to-mid September 2026, including seizure of Mocha port, Perim Island, and Hanish Islands, have strengthened their capacity to enforce a maritime blockade and target Saudi-linked oil shipments rerouted from the disrupted Strait of Hormuz via the East-West pipeline to Yanbu. These advances coincide with elevated Brent crude prices above $100 per barrel, rising war-risk insurance premiums, and reduced strait transits, directly supporting higher implied probabilities for a confirmed seizure of an oil tanker or oil-laden vessel by late October. Trader sentiment reflects the distinction between drone or missile strikes—which do not resolve the market—and actual boarding or control of a commercial tanker, with recent attempted attacks south of the strait underscoring ongoing operational risks amid broader Iran-Saudi tensions. Key near-term catalysts include any escalation in Houthi naval activity or coalition responses that could alter shipping volumes or enable a qualifying seizure event.