Why all nine carriers move together

When MSC suspends Hormuz transits, Maersk follows within a week. CMA CGM and Hapag-Lloyd are next, then ONE, Evergreen, and HMM. By the time COSCO and Yang Ming announce, the others have been off the route for a fortnight. The sequence looks coordinated. It isn’t. They’re reading the same data.

The decision input is shared.

Every major container carrier subscribes to the same handful of operational risk advisories. Lloyd’s Market Intelligence, the JWC circulars, the IMO Maritime Security Committee, the relevant flag-state notices, and a few private security-advisory shops (Ambrey, Dryad, Dryad). The narratives differ at the margin; the data is the same.

Each carrier has its own internal risk team that processes these inputs against its own risk policy and customer commitments. The risk teams talk to each other through industry bodies (BIMCO, ICS) but not about specific operational decisions. The convergence in announcement timing is not collusion. It is the consequence of industries operating against the same information set under similar risk policies.

The first-mover problem.

The carrier that suspends first carries a particular risk: customers redirect bookings to competitors, and the competitive damage from being “the one that pulled out” can persist past the operational event. A carrier that suspends last bears the operational risk — a vessel hit during the gap before they pull, customer liabilities for delayed cargo — but is also seen as having stuck with shippers as long as possible.

The order in which carriers move tells you something about their risk policy and their commercial position. MSC and Maersk usually move first because their fleet sizes give them flexibility — they can reroute substantial capacity onto the Cape with limited customer impact. Smaller and Asian-headquartered lines tend to move later because their customer concentration in Asia–Europe flows is higher and the alternatives are weaker.

The five-of-nine threshold.

Once five carriers have moved, the remaining four are usually within days. The dynamic flips. The first-mover cost has been absorbed; the operational risk has been validated by half the industry; staying on the route is now the position requiring justification.

Straits’ verdict logic encodes this. We treat the strait as effectively closed when five or more of the top nine lines have suspended or are rerouting. The threshold is editorial — not an industry standard — but it captures the moment at which commercial operators’ collective risk policy has crossed from individual decisions into a market-wide retreat. Before five, we treat the strait as restricted. After five, the operational picture has tipped.

Reading the speed of the cascade.

The interesting variable is not whether the carriers move, but how quickly. A cascade that completes within seven days means the operational picture deteriorated rapidly — an actual incident, a JWC re-listing, a credible threat. A cascade that takes three weeks to complete means the carriers are reading a slower-developing risk picture where each individual line is making judgement calls based on a slowly-updating insurance market.

Fast cascades correspond to sharper Brent moves and steeper prediction-market repricing. Slow cascades correspond to the war-risk insurance multiple grinding higher over weeks rather than spiking. The dashboard’s Carriers block shows the “since” date for each carrier’s current posture; the spread between the earliest and latest is the cascade-speed reading.

The asymmetric reverse.

Carriers move out together but they don’t move back in together. Suspension is a single decision: stop routing through the strait, redirect bookings, issue a customer advisory. Resumption requires re-validating the operational picture, training crews on the route again, re-pricing customer contracts that were rewritten during the closure, and securing fresh insurance terms. Each step adds friction.

Historical data from past Hormuz tensions shows resumptions coming one carrier at a time over weeks, with the first-movers (typically the same MSC + Maersk pair) leading and the slower-movers waiting for the leaders to validate. A cascade of resumptions within a single week is unusual and suggests a fast and credible de-escalation; a slow trickle suggests the carriers are hedging the recovery.

What the dashboard tracks.

The Carriers block on the homepage shows each line’s current declared posture (suspended, rerouting, limited, transiting), the surcharge per TEU where it has been announced, and the date the current posture took effect. The block alerts when the suspended-or-rerouting count crosses the five-of-nine threshold — the editorial moment at which we read the strait as effectively closed.

For the recovery side, watch the surcharge column. Surcharges falling before postures change is the carriers’ way of testing whether customers will commit to the route at a lower premium. Surcharges unchanged but postures shifting is the operational read leading the commercial pricing.

Live carrier postures at /#carriers. Carrier suspensions JSON via /status. Cape route economics at /cape-of-good-hope-reroute.