The Strait of Hormuz represents one of the world's most strategically important waterways, serving as a critical passage for global energy supplies and international commerce. These four prediction markets track the likelihood that Germany, the United Kingdom, Japan, and France will each deploy warships through this contested waterway by May 31, 2026—a collective timeframe that reflects mounting geopolitical tensions and naval posturing in the Middle East and beyond. The grouping of these markets acknowledges a shared underlying scenario: escalating international military engagement in response to regional instability, whether driven by conflict, sanctions, or diplomatic crises. When comparing these markets, observers should note the relative probabilities assigned to each nation, which reflect both the political will and military capacity of each country to intervene. Germany's participation signals European NATO commitment; the UK's reflects Britain's ongoing role as a maritime power; Japan's indicates Indo-Pacific strategic interests; and France's underscores its legacy military presence in the region. These distinctions matter—each nation's decision carries different geopolitical weight, and divergences in their respective market odds may reveal which countries are viewed as more likely respondents to escalation. The approaching May 31 deadline creates urgency: markets will price in real-world developments including diplomatic statements, military exercises, sanctions regimes, and regional flashpoints. Readers evaluating these markets should monitor news cycles around Middle Eastern tensions, NATO positioning, international trade disruptions, and explicit statements from government officials about potential military action. The collection of these four markets together provides a more nuanced picture than any single prediction—it allows observers to construct an implicit probability map of international response patterns and to assess which nations are viewed as most or least likely to participate in potential naval operations through this critical strategic chokepoint.