Chokepoint Data · the Strait of Hormuz crisis

IRGC declares Strait of Hormuz closed to commercial shipping

2026-02-28 · shipping · major

Hours after the strikes began, the IRGC transmitted VHF warnings that 'no ship is allowed to pass the Strait of Hormuz', beginning the closure. The UK Royal Navy noted the declaration was not legally binding but that safety could not be guaranteed, and several ships stayed in port or turned back.

Brent next close +8.3% · +7 days +34.2% · transits 83.6 → 11.4 per day · outsized reaction — bigger than 98.6% of pre-crisis days

Attribution caveat: 1 other major event(s) sit inside this one's ±7-day window (2026-02-28 US and Israel launch Operation Epic Fury airstrikes; Khamenei killed), so the reaction is not cleanly separable.

Sources

Congressional Research Service · Wikipedia - 2026 Strait of Hormuz campaign

See this event on the annotated timeline →

Computed, not asserted — every number here is derived from public data: official EIA Brent closes via FRED, IMF PortWatch transit counts, Polymarket and Kalshi odds, and source-linked curated events. Method and caveats · Atom feed · llms.txt

https://chokepointdata.com/event/2026-02-28-irgc-declares-strait-of-hormuz-closed-to-commercial-shipping/