Iran bans military vessels from Strait of Hormuz, impacting UK warship plans

Iran’s military has declared no military vessels will be allowed through the Strait of Hormuz. The Polymarket contract on a UK warship transit by April 30 trades at 5.5% YES, down from 12% a week ago.

Market reaction

Iran’s announcement has driven down odds on UK warships entering the Strait. The market sits at 5.5% YES, with traders pricing in greater confrontation risk. The drop from 12% in a week suggests this is being read as a serious escalation. The cost of moving the market five points is just $427, and daily USDC volume is $2,086, so this is a thin market. The largest single move today was a 1-point drop.

Why it matters

The Strait of Hormuz handles roughly a fifth of global oil shipments. Iran declaring a ban on military vessel transit changes the calculus for any navy considering passage. At 5.5¢, a YES share pays $1 if the UK sends warships through by April 30, a 18x return. Collecting on that bet requires believing the UK would defy Iran’s restrictions within two weeks.

What to watch

Statements from the UK Ministry of Defence and any diplomatic moves by France or other allied nations will be the next signals, especially as the April 30 deadline approaches.

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