US styrene monomer (SM) exporters are working to fill widening supply gaps in Europe following the outbreak of the Mideast Gulf war, which has impeded vessel traffic through the strait of Hormuz and sharply reduced Middle East SM export flows.
The global supply constraint has pushed US styrene to a nearly two-year high just days before the start of the American Fuel & Petrochemical Manufacturers' International Petrochemical Conference in San Antonio, Texas, from 29-31 March 2026, where industry participants gather from around the world to discuss pertinent topics in petrochemical markets and construct forward-looking views for the forthcoming year.
Producers in the Middle East make up a significant portion of global styrene trade. Saudi Arabia accounts for 44pc of China's SM imports, 40pc of India imports and 33pc of European imports, according to Global Trade Tracker data. Europe has been particularly exposed as shipments through the Mideast Gulf have slowed down.
European SM prices have risen by 40pc since the start of the conflict because of tight SM supply, reaching $1,697.50/t on 26 March, according to Argus data. US SM prices increased by 27pc over the same period to $1,450/t, opening the paper arbitrage from the US Gulf coast (USGC) to Europe.
Heading into April, US exporters are attempting to secure more vessels for trans Atlantic shipments, but tight tanker availability has created significant export bottlenecks, market participants said. Bulk freight shipping availability from the USGC to northwest Europe and the Mediterranean remained restricted in March, pushing freight rates sharply higher. Estimated shipping costs from the USGC to Europe nearly doubled to around $140/t this week from $72/t in February.
Estimated North American SM operating rates ranged from 56-60pc this week, according to a generic Argus model with run rates pegged by market participants. Operating rates have been reduced because of planned maintenance at two USGC SM plants: SABIC and TotalEnergies' joint venture facility in Carville, Louisiana, and Ineos Styrolution's plant in Bayport, Texas. The Carville, Louisiana, unit is expected back on line in early April, potentially lifting regional rates to around 65pc, but US Gulf coast spot availability remains limited. Sources estimate roughly 5,000 metric tonnes of SM is available for April spot sales without producers drawing from their derivative units.
Export constraints are compounded by a heavy global turnaround season. At least two US SM units are in planned outages, two Saudi Arabian plants were scheduled for maintenance in March and at least two European feedstock ethylene crackers underwent work in the first quarter.
More recently, Saudi Arabian state-controlled petrochemicals producer [Sabic has declared force majeure] (https://direct.argusmedia.com/newsandanalysis/article/2806297) on its methanol and SM sales, effective 26 March, citing logistics disruptions stemming from the ongoing US-Iran war and impeded vessel traffic through the strait of Hormuz.
Tight SM supply has begun to filter into downstream markets. Polystyrene (PS) and acrylonitrile butadiene styrene (ABS) producers are entering a seasonably stronger demand period with higher pricing. The impact is expected to ripple through consumer goods such as plastic take-away containers, disposable cutlery, foam packaging and ABS based products including toys and Lego bricks, sources said.
As the US and global styrene turnaround season continues, market participants expect inventories to remain tight until domestic maintenance wraps up in the second quarter. Global SM availability is likely to stay constrained while vessel shortages persist and shipments remain restricted through the strait of Hormuz, sources said.
