On 18 May 2026, six India-flagged merchant vessels transited inbound through the Strait of Hormuz in a coordinated cluster, following bilateral engagement between the Iranian and Indian governments that produced functional safe-passage arrangements outside the United States-Bahrain coalition framework. The Windward analytical service characterised the configuration that has emerged in the past ten days as a “holding queue” pattern: Iran has moved from kinetic interdiction of unwanted vessels to administrative control through the Persian Gulf Strait Authority, with bilateral carve-outs for selected partners and coercive interdiction held in reserve for everyone else.<\/p>\n
The 18 May India-flagged cluster is one of the clearest operational expressions yet of the pattern. It comes three days after the seizure-and-sinking incidents of 14-15 May analysed in the ten-day-test post<\/a>, one day before the PGSA was formally announced and analysed in the PGSA post<\/a>, and four days after the Trump-Xi Beijing summit analysed in the Trump-Xi post<\/a>. The pattern that the 18 May cluster operationalises is structurally different from any of the configurations the principal parties to the dispute have publicly committed to. This post reads what the bifurcation means at Hormuz, why it is structurally unstable, and what an institutional answer would need to do to consolidate it.<\/p>\n The pattern operating on the strait as of 20 May has three components. The first component is the PGSA corridor, the administratively-controlled transit channel between the islands of Qeshm and Larak documented in the PGSA post. Vessels admitted to the corridor have completed the PGSA vetting, paid the appropriate fee, and are escorted by IRGC Navy pilot boats through Iranian territorial waters. Approximately twenty-six transits used the corridor between 13 March and the late-March reporting window, with the volume increasing through April and May as the system has matured.<\/p>\n The second component is the bilateral carve-out arrangement. Selected counterparties \u2014 China through arrangements analysed in the China Blocking Rules post<\/a>, India through the 18 May coordinated cluster, Pakistan through the arrangement noted in the Pakistan mediation post<\/a> on Pakistani crude transit during the closure, Malaysia through arrangements that have appeared in the public reporting in less specific form, and additional counterparties under various combinations of state-to-state engagement \u2014 receive functional safe-passage arrangements that are operationalised through but not formally distinct from the PGSA process. The bilateral arrangements produce, in practice, a tiered access structure in which the published five-tier vetting is supplemented by bilateral negotiations on fee rates, transit timing, escort arrangements, and other operational specifics.<\/p>\n The third component is the holding queue. Approximately two thousand vessels are reported to be awaiting transit on both sides of the strait, with the majority unable or unwilling to use the PGSA corridor because of vetting exclusions (United States-related vessels, vessels in the higher tiers of the five-tier classification), insurance constraints (vessels whose underwriters have withdrawn cover for the PGSA-administered channel), counterparty refusals (charterers, banks, lenders, and classification societies that will not accept PGSA-administered transit terms), or operational risk preferences (operators that decline the PGSA risk on commercial grounds). The holding queue is the structural product of the gap between the operator class’s transit demand and the PGSA’s transit supply: a queue of vessels that could be moving but is not.<\/p>\n The chokepoint, as of 20 May, is operationally bifurcated. There is a “compliant fleet” \u2014 the subset of the operator class that has either completed PGSA vetting or has bilateral carve-outs, with insurance from Hormuz Safe or from continuing arrangements with crypto-tolerant underwriters, payment through yuan or stablecoin rails, and counterparty acceptance from the China-, India-, Pakistan-, Malaysia-, Egypt-, South Korea-tolerant trading and financial infrastructure. The compliant fleet is moving through the corridor at a measurable but reduced rate. There is a “non-compliant fleet” \u2014 the larger subset of the operator class with United States-system counterparties, International Group P&I cover, dollar-denominated banking, and Western-aligned charterer relationships. The non-compliant fleet is not transiting and is the source of the holding queue.<\/p>\n The bifurcation is a different structural condition from the pre-war Hormuz baseline, which operated as a single market under UNCLOS transit passage rules, with no chokepoint-authority differentiation between flag-states or vessel ownership. It is also a different condition from the operational closure of late April analysed in the five-per-cent-of-normal post<\/a>, in which the strait was effectively closed to all but a small residual of Iranian-cleared movements. The 20 May configuration is closure-with-channels: not zero throughput, but throughput in a structurally segregated form that produces two parallel maritime economies rather than one.<\/p>\n The bifurcated configuration is, in the site’s reading, structurally unstable on three dimensions. On the demand side, the operator class is integrated globally: the same shipowners, charterers, brokers, classification societies, lenders, and underwriters that operate the non-compliant fleet through Suez also operate the non-compliant fleet through Panama, the Cape of Good Hope routing, and the Northern Sea Route. They are not segregable into a “compliant” and a “non-compliant” subset without producing arbitrage and reshuffling pressure across the global fleet’s operating arrangements. The longer the bifurcation persists, the more pressure accumulates on operators to choose one side or the other, and the more pressure accumulates on the international counterparties (port states, classification societies, lenders, underwriters) to either accommodate or reject PGSA-administered transit.<\/p>\n On the supply side, the PGSA’s vetting and bilateral-carve-out infrastructure has a fixed administrative capacity. It can process some number of vessels per day at the present staffing and corridor throughput. The number is materially below the pre-war one-hundred-and-thirty-eight-per-day baseline. The compliant fleet is, in operational practice, scaling to fill the supply that the PGSA can administer. Bilateral carve-outs are negotiated on a state-to-state basis that does not scale linearly with the number of states seeking arrangements. The supply-side bottleneck holds the bifurcation in place for the compliant fleet without resolving anything for the non-compliant fleet.<\/p>\n On the institutional side, the bifurcation is held in place by a configuration that none of the principal parties to the chokepoint dispute has formally endorsed as a working long-term arrangement. The United States, through the Treasury rules analysed in the Treasury post<\/a>, has formally rejected the PGSA payment channel. China, through the Trump-Xi summit’s “no charge for transiting” line, has formally rejected the PGSA tariff structure. The GCC, through the Jeddah communique and the UN draft resolution analysed in the GCC long-term arrangement post<\/a>, has formally rejected the PGSA’s institutional configuration. The operator class, through the 25 April ICS statement<\/a>, has formally rejected the legal basis on which the PGSA operates. The bifurcation works in practice for a subset of the operator class because the operational details have been negotiated bilaterally; it is not endorsed by the institutional framework any of the parties has publicly committed to.<\/p>\n The closest historical parallel to the present Hormuz configuration is the bifurcated shipping channel that operated under the United States and European Union secondary sanctions regimes on Iranian crude during the 2018-2025 period. That arrangement also operated as a compliant fleet (under standard commercial cover, dollar settlement, Western counterparty acceptance) and a non-compliant fleet (under “shadow fleet” cover, alternative settlement channels, China- and India-tolerant counterparty acceptance) operating in parallel. The shadow fleet grew over the period to approximately five hundred to seven hundred vessels in some estimates, with operations that included AIS-disabling transits, ship-to-ship transfers in the Persian Gulf, the South China Sea, and the eastern Mediterranean, and complex ownership-and-flag-state arrangements designed to obscure sanctions-relevant identification.<\/p>\n The 2018-2025 shadow fleet operated in the seas as a whole; the 2026 PGSA configuration operates specifically at the chokepoint. The architectural overlap is, however, substantial. Both arrangements are bifurcated commercial-shipping structures operating outside the institutional baseline that the operator class as a whole accepts. Both produce specific tradeoffs for the participating operators: access in exchange for institutional segregation. The relevant lesson of the 2018-2025 period for the 2026 configuration is that the bifurcation can operate at scale for years, but it produces a cumulative structural cost to the global shipping economy in compliance complexity, insurance fragmentation, counterparty risk management, and litigation exposure that the operator class would, if given an institutional alternative, prefer to avoid. The 2018-2025 period also ended, when it ended, with the closure of the institutional gap through a combination of sanctions adjustment, diplomatic normalisation, and operator-class consolidation. None of those mechanisms is in place at Hormuz on 20 May.<\/p>\n A treaty-backed Hormuz transit authority on the Suez or Panama model would consolidate the bifurcation by producing a single working arrangement that the operator class as a whole could use. The structural elements are documented across the site’s analysis: a civilian administering body insulated from direct military command, replacing the IRGC-PGSA structure; a published equal-access tariff differentiated by operational factors (tonnage, vessel type, cargo, laden condition) rather than flag-state political posture, replacing the five-tier vetting and the bilateral carve-out structure; dollar-denominated settlement through named major banks, replacing the yuan\/Bitcoin\/USDT channel; the integration of standard International Group P&I cover with the chokepoint authority’s standing casualty-management infrastructure, replacing the Hormuz Safe alternative-insurance arrangement; monthly statistical bulletins, replacing the AIS-disabled corridor opacity; and a recognised dispute-resolution forum, replacing the no-forum status of the present arrangement. The comparison page<\/a> walks through the institutional arithmetic. The rate schedule<\/a> proposes the services-fee tariff. The calculator<\/a> prices a transit against it.<\/p>\n The consolidation does not eliminate bilateral state-to-state relationships; those continue around any working chokepoint authority. It removes the structural segregation of the operator class into compliant and non-compliant subsets that is the most economically expensive feature of the present configuration. The compliant fleet absorbs the non-compliant fleet’s traffic as the institutional baseline accepts the broader operator class. The holding queue empties. The bifurcation closes. The work the chokepoint authority is doing, in this frame, is consolidation: producing a single working market out of two parallel arrangements that none of the principal parties is, in their public records, formally committed to maintaining.<\/p>\n The 18 May India-flagged cluster is, in this reading, the operational signal that the bifurcated arrangement is working at the level of bilateral state-to-state engagement. It is not the signal that the chokepoint is reopening on terms the global operator class can use. The work the institutional answer would do is the work of converting the bilateral signals into a multilateral baseline. The conversion is presently incomplete on every dimension, and the structural pressures that the bifurcation accumulates over time make the conversion more, not less, important to complete.<\/p>\n Sources: Windward analytical commentary, “Hormuz Becomes a Holding Queue: Iran’s Toll Regime, Bilateral Carve-Outs, and a Bifurcating Strait,” May 2026; Windward, “Iran’s Hormuz Transit Toll Mechanism and What It Means at Sea”; HSToday, “Iran Conflict Maritime Update: Iran Expands Administrative Control Over Hormuz as Commercial Shipping Splinters,” May 2026; CNN, “Iran imposes new rules for Strait of Hormuz in bid to secure wartime gains,” 7 May 2026; Newsweek, “Iran formalizes Strait of Hormuz control and toll collection,” May 2026; International Crisis Group, “Strait of Hormuz” flashpoints commentary; reporting on the 18 May 2026 India-flagged vessel cluster; this site’s prior analyses on the UNCLOS vacuum (24 April), the cost stack (23 April), the Hengli buyer-leg (25 April), the ICS statement (25 April), the Treasury position (30 April), the five-per-cent-of-normal post (30 April), Pakistan mediation (4 May), the GCC long-term arrangement (11 May), the China Blocking Rules post (11 May), the Trump-Xi summit (15 May), the ten-day test (15 May), and the PGSA toll booth (19 May).<\/em><\/p>\n","protected":false},"excerpt":{"rendered":" Six India-flagged vessels transited inbound on 18 May 2026 in a coordinated cluster under bilateral Iran-India arrangements. The chokepoint is now operationally bifurcated: a compliant fleet under PGSA-administered transit and a holding queue of about 2,000 vessels waiting for the institutional configuration the operator class can use. This post reads the bifurcation, the historical parallel of the 2018-2025 shadow fleet, and what a treaty-backed authority would do to consolidate it.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"pagelayer_contact_templates":[],"_pagelayer_content":"","footnotes":""},"categories":[2,166,237,3],"tags":[5,213,278,31,6,81,25,172,134,177,267,268,200,4,67,78],"class_list":["post-148","post","type-post","status-publish","format-standard","hentry","category-analysis","category-governance","category-operations","category-toll-system","tag-2026-crisis","tag-ais","tag-bilateral-arrangements","tag-china","tag-chokepoint-governance","tag-india","tag-iran","tag-malaysia","tag-pakistan","tag-panama-canal-authority","tag-persian-gulf-strait-authority","tag-pgsa","tag-shadow-fleet","tag-strait-of-hormuz","tag-suez-canal-authority","tag-windward"],"_links":{"self":[{"href":"https:\/\/hormuztoll.com\/news\/wp-json\/wp\/v2\/posts\/148","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hormuztoll.com\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hormuztoll.com\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hormuztoll.com\/news\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hormuztoll.com\/news\/wp-json\/wp\/v2\/comments?post=148"}],"version-history":[{"count":1,"href":"https:\/\/hormuztoll.com\/news\/wp-json\/wp\/v2\/posts\/148\/revisions"}],"predecessor-version":[{"id":149,"href":"https:\/\/hormuztoll.com\/news\/wp-json\/wp\/v2\/posts\/148\/revisions\/149"}],"wp:attachment":[{"href":"https:\/\/hormuztoll.com\/news\/wp-json\/wp\/v2\/media?parent=148"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hormuztoll.com\/news\/wp-json\/wp\/v2\/categories?post=148"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hormuztoll.com\/news\/wp-json\/wp\/v2\/tags?post=148"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}What the holding-queue pattern is<\/h2>\n
The bifurcation as an operational fact<\/h2>\n
Why the bifurcation is structurally unstable<\/h2>\n
The historical parallel: sanctions-era shipping channels<\/h2>\n
What an institutional answer would do<\/h2>\n