Short Answer

Both the model and the market expect traffic through the Strait of Hormuz to be Above 30, with no compelling evidence of mispricing.

1. Market Behavior & Drivers

This market, which speculates on traffic continuing through the Strait of Hormuz, opened with a high probability of 92.0% for a "YES" resolution. The price has since entered a sideways consolidation pattern, trading within a 15-point range between 80.0% and 95.0%. The most significant price action occurred early in the trading period when the probability sharply dropped from its opening level to a low of 81.0% before partially recovering. The current price of 88.0% reflects a slight decrease in confidence from the market's opening assessment.
The sharp drop to 81.0% was the most notable event and was accompanied by a significant volume spike of over 347 contracts, accounting for the vast majority of the total volume traded. With no specific news or external context provided, this price movement appears to be the result of internal market dynamics, such as a large seller entering the market. The price found strong support around the 80.0% to 81.0% level, as the high volume indicates that buyers met the selling pressure and pushed the price back up to 88.0%. This price action suggests the market sentiment remains strongly skewed towards a "YES" outcome, but the initial volatility indicates some underlying uncertainty. The market has since established an equilibrium around 88.0%, reflecting a stable but watchful consensus.
  • Presence of three US Carrier Strike Groups in the Strait.
  • US Navy initiated a mine clearance mission in the Strait.
  • Iran's IRGC Navy fast-attack craft show elevated activity.
  • War risk insurance premiums significantly increased for Strait transit.
  • Reported Iranian blockade prompted current US military response.

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Significant Price Movements

Notable price changes detected in the chart, along with research into what caused each movement.

📈 April 28, 2026: 33.0pp spike

Price increased from 34.0% to 67.0%

Outcome: Above 40

What happened: No supporting research available for this anomaly.

4. Market Data

Contract Snapshot

This market resolves to Yes if the total number of transit calls through the Strait of Hormuz, summed daily from April 27, 2026, to May 3, 2026, is above 50. Conversely, it resolves to No if the total is 50 or below. The official data source for verification is IMF PortWatch, and the market is projected to resolve and pay out on May 5, 2026, at 9:30 AM EDT.

Market Discussion

Traders are primarily discussing the significant discrepancies between the official IMF PortWatch data, which resolves the market, and other online shipping traffic sources like Windward AIS. This inconsistency creates frustration and uncertainty, with some speculating that official numbers might undercount actual traffic while others predict lower counts similar to the previous week based on past IMF reports. There's a general consensus that the official data is unreliable and unpredictable, making accurate forecasting challenging.

5. What was Iran's IRGC naval posture in Strait of Hormuz by April 27?

Initial Patrols (April 24)Multiple groups (5-10 boats each) actively patrolling [1]
Peak Concentration (April 23)33 IRGC fast-attack craft near Kargan coast [2]
Posture by April 27Decreased from peak, but higher than normal dispersed patrols [3]
The IRGC Navy fast-attack craft showed significantly elevated activity. In the initial 48 hours of the 72-hour period leading up to April 27th, fast-attack craft flotillas from Bandar Abbas and Qeshm Island maintained a heightened and active posture in the Strait of Hormuz. Satellite imagery from April 24th indicated multiple groups, typically comprising 5-10 boats each, actively patrolling the waters north of the Strait, frequently operating in swarm formations, sometimes near commercial shipping lanes, and conducting maneuvers [1]. This activity was part of a broader surge in IRGC Navy presence observed since April 20th [4]. On April 23rd, a substantial concentration of 33 IRGC fast-attack craft was specifically identified near the Kargan coast [2]. Other vessels from Bandar Abbas and Qeshm Island conducted regular patrols, often in groups of 8-12, signaling a consistent and elevated presence [5].
Activity decreased but IRGC Navy posture remained elevated. As the 72-hour period progressed towards April 27th, maritime intelligence sources indicated a reduction in the intensity and overall number of IRGC vessels. By April 26th and continuing into April 27th, the high number of fast-attack craft had decreased from the peak observed earlier in the week, with a steady reduction over the preceding 24-48 hours [3]. Despite this reduction, the IRGC had not fully reverted to its pre-surge posture, instead maintaining a higher-than-normal number of vessels dispersed for patrols across the area [3]. While the most intense swarming activities may have subsided, the IRGC Navy's operational presence from its key bases remained elevated compared to typical levels [3]. During this timeframe, shipping traffic through the Strait of Hormuz remained muted [6].
Sources (6)
  1. 1Iran Fast-Boat Swarms Add to Hormuz Threats for Shippinginsurancejournal.com
  2. 2Satellite images capture unusual activity in Strait of Hormuz: 33 IRGC fast-attack fleet near Kargan coast- The Weektheweek.in
  3. 3April 27, 2026: Iran War Maritime Intelligence Dailywindward.ai
  4. 4Iran Update Special Report, April 22, 2026 | ISWunderstandingwar.org
  5. 5April 23, 2026: Iran War Maritime Intelligence Dailywindward.ai
  6. 6Hormuz Shipping Traffic Remains Muted With no US-Iran Deal in Sight, Data Showsinsurancejournal.com

6. How Do War Risk Insurance Premiums Impact Strait of Hormuz Shipping?

War Risk Premium per TransitMillions of dollars [1]
Premium for US/UK/Israeli ShipsUp to three times more [2]
Joint War Committee ActionExpanded 'Listed Areas' in Gulf [3]
War risk insurance premiums have significantly increased for Strait of Hormuz transit. The Joint War Committee (JWC) of Lloyd's of London has expanded its "Listed Areas" to include parts of the Gulf, which directly impacts vessels navigating the Strait of Hormuz [3]. This expansion has caused war risk insurance costs to potentially rise to millions of dollars per transit for vessels through the Strait of Hormuz [1]. Notably, vessels flagged in the US, UK, and Israel face substantially higher charges, with Middle East war cover costing up to three times more than for other nations [2]. Despite these escalating regional risks, Lloyd's CEO has stressed the critical importance of ensuring the continued availability of war coverage [4], as governments are increasingly becoming "insurers of last resort" [5].
Major tanker operators have not publicly announced specific Strait of Hormuz rerouting protocols. Based on available sources, there are no explicit public announcements from major tanker operators such as Frontline or Euronav detailing rerouting or convoy protocols specifically for the Strait of Hormuz. However, broader regional tensions have led some shipping lines to alter routes; for example, Maersk rerouted vessels around the Cape of Good Hope due to escalating tensions in the Suez Canal and Bab-el-Mandeb Strait [6]. Despite these rerouting patterns observed in other regions, vessel tracking data shows a convoy of tankers in the Strait of Hormuz [7]. Furthermore, reports indicate that 34 Iran-linked tankers have bypassed a US naval blockade within the area [8]. These observations suggest ongoing, high-risk maritime traffic continues through the Strait of Hormuz.
Sources (8)
  1. 1Strait of Hormuz War Risk Insurance Costs Soar to Millions per Transit Amid Ongoing Middle East Tensionsibtimes.com.au
  2. 2US, UK and Israeli ships charged three times more than others for Middle East war cover:: Lloyd's Listlloydslist.com
  3. 3Joint war committee revises listed areas following Iran strikesi-law.com
  4. 4Lloyd’s CEO Says It’s Critical Mideast War Cover Stays Availableclaimsjournal.com
  5. 5What stopping war-risk insurance in the Strait of Hormuz tells us | World Economic Forumweforum.org
  6. 6Shipping companies divert vessels around Cape of Good Hope after strikes on Iran | Reuterstoday.reuters.com
  7. 7Convoy of tankers is seen crossing Strait of Hormuz, vessel tracking data shows | BOE Reportboereport.com
  8. 834 Iran-Linked Tankers Bypass US Naval Blockade in the Strait of Hormuz, Data Showsthedefensenews.com

7. What US Navy Carrier Strike Groups Are in the Strait of Hormuz?

Number of Carrier Strike GroupsThree [1], [2]
Deployed CSG NamesUSS Gerald R. Ford, USS Dwight D. Eisenhower, USS Abraham Lincoln [1], [3], [4]
Active US Navy OperationMine clearance mission in Strait of Hormuz [5], [6], [7]
The US Navy's 5th Fleet has three Carrier Strike Groups deployed. As of late April 2026, the US Navy's 5th Fleet has deployed three Carrier Strike Groups (CSGs) to its area of responsibility, marking the first time since 2003 that three carriers have been present in the Middle East [1], [2]. These include the USS Gerald R. Ford (CVN-78), USS Dwight D. Eisenhower (CVN-69), and USS Abraham Lincoln (CVN-72) CSGs. These groups are reported to be operating in the Arabian Sea or Gulf of Oman, in close proximity to the Strait of Hormuz [1], [3], [4].
US forces began a mine clearance mission in the Strait of Hormuz. Simultaneously, US forces initiated a critical mine clearance mission within the Strait of Hormuz, commencing around April 26, 2026 [5], [6], [7]. This operation directly addresses a reported 'Hormuz blockade' and falls within the market period of April 27 - May 3. The mission serves to ensure unimpeded passage through international waters, indicating active naval operations directly impacting traffic through the Strait [5], [6], [7].
Sources (7)
  1. 1USNI News Fleet and Marine Tracker: April, 27 2026news.usni.org
  2. 2Three carriers operate in Middle East for first time since 2003: CENTCOM - Breaking Defensebreakingdefense.com
  3. 3Carrier Tracker As of April 26, 2026twz.com
  4. 4Carrier Tracker As of April 26, 2026yahoo.com
  5. 5U.S. Forces Start Mine Clearance Mission in Strait of Hormuz > U.S. Central Command > Press Release Viewcentcom.mil
  6. 6U.S. Forces Start Mine Clearance Mission in Strait of Hormuz - Naval Newsnavalnews.com
  7. 7U.S. Navy Stages for Mine Clearance as Hormuz Blockade Begins - Naval Newsnavalnews.com

8. Did Iran's Oil Exports Decrease Before April 27, 2026?

April vs. March ExportsMore oil exported in first 24 days of April than all of March (TankerTrackers.com [1])
Daily Export Volume1.5 million barrels a day as of April 20th (The Middle East Insider [2])
Unused Oil StorageShrank to 22 days or less by April 27th (Kpler [3])
Iran's crude and condensate exports showed no anomalous decrease before April 27. AIS tanker tracking data from various sources indicates no anomalous decrease in Iran's crude oil and condensate exports through the Strait of Hormuz just prior to April 27, 2026. Instead, available data suggests a continuation and even an increase in export activity. For instance, TankerTrackers.com reported that Iran exported more oil in the first 24 days of April than it did in the entirety of March [1]. Furthermore, Vortexa affirmed that Iran continued its crude exports despite a US blockade [4], with The Middle East Insider noting that 1.5 million barrels a day were still being moved as of April 20th [2].
Shrinking oil storage capacity supports the conclusion of sustained exports. The status of Iran's oil storage further corroborates the finding of sustained, rather than decreased, exports. As of April 27, 2026, Kpler stated that Iran’s unused oil storage had shrunk to 22 days or less [3]. This reduction in available storage capacity, which was also noted by Discovery Alert amid the US blockade [5], implies that export volumes were maintained at a level that prevented the accumulation of excess crude and condensate. This trend suggests active export management, rather than a pre-planned disruption aimed at minimizing economic losses through reduced exports.
Sources (5)
  1. 1Opor Joseph - “TankerTrackers: Iran Exported More Oil in... | Facebookfacebook.com
  2. 2Iran’s Dark Fleet 2026: How 1.5M Barrels a Day Still Move — The Middle East Insiderthemiddleeastinsider.com
  3. 3Iran’s Unused Oil Storage Shrinks to 22 Days or Less, Kpler Says - Bloombergbloomberg.com
  4. 4Iran continues crude exports despite US blockade, Vortexa says | BOE Reportboereport.com
  5. 5Iran Oil Storage Shrinks Amid US Blockade 2026discoveryalert.com.au

9. Where to Find Historical Strait of Hormuz Daily Transit Data?

Specific historical calculationsNot directly presented in current information [1]
MacroMicro data referenceDaily Transit Calls & Transit Trade Volume for Strait of Hormuz [2]
IMF Portwatch dataDaily transit call data available for direct download [3]
Specific pre-calculated vessel transit statistics are not directly available. Web research did not directly provide the pre-calculated mean and standard deviation for daily vessel transits through the Strait of Hormuz for April 27 - May 3 in 2021, 2022, and 2023. However, key resources have been identified for obtaining the granular historical data needed for such calculations.
Key sources for granular transit data have been identified. MacroMicro, referencing IMF data, provides "Daily Transit Calls & Transit Trade Volume" specifically for the Strait of Hormuz [2]. Additionally, the IMF's Portwatch initiative serves as an important resource, offering "chokepoints indicators" that include daily transit call data available for direct download [3].
Further analysis is required to establish a non-conflict baseline. To establish a non-conflict baseline for comparison with current traffic, it would be necessary to access and analyze the daily transit call data from these identified sources for the specified periods in 2021, 2022, and 2023 [2], [3]. This analysis would then allow for the calculation of the mean and standard deviation for vessel transits.
Sources (3)
  1. 1Live Ship Data - Strait of Hormuzhormuzmonitor.com
  2. 2IMF - Strait of Hormuz - Daily Transit Calls & Transit Trade Volume | MacroMicroen.macromicro.me
  3. 3Portwatch chokepoints indicators.htmldata-download.imf.org

11. Historical Resolutions

Historical Resolutions: 13 markets in this series

Outcomes: 1 resolved YES, 12 resolved NO

Recent resolutions:

  • KXHORMUZWEEKLY-26APR26-T90: NO (Apr 28, 2026)
  • KXHORMUZWEEKLY-26APR26-T80: NO (Apr 28, 2026)
  • KXHORMUZWEEKLY-26APR26-T70: NO (Apr 28, 2026)
  • KXHORMUZWEEKLY-26APR26-T60: NO (Apr 28, 2026)
  • KXHORMUZWEEKLY-26APR26-T50: NO (Apr 28, 2026)