On July 27, Marathon Petroleum fell 3.31% in pre-market trading, trading at $299.0/share, with turnover of $473,400. The broader refining sector came under broad-based selling pressure, with peers Valero Energy down 3.14%, Phillips 66 down 2.67%, PBF Energy down 4.27%, and HF Sinclair down 3.6%.

On the news front, reports emerged that Pakistan is mediating a resumption of US-Iran nuclear negotiations, with a major Asian nation actively supporting diplomatic efforts. This triggered a sharp cooling of crude oil bullish sentiment and a significant pullback in international oil prices. The market is concerned that if geopolitical tensions ease, crack spreads — previously elevated to record levels amid supply tightness linked to Strait of Hormuz disruptions — could face meaningful compression, squeezing refiners' outsized profit margins and dragging down the entire sector.

Notably, earlier this month Goldman Sachs had warned that Strait of Hormuz disruptions had reduced Persian Gulf oil flows to roughly 70% of normal levels, with production still more than 10 million barrels per day below pre-conflict output. Marathon Petroleum itself had stated in its Q1 earnings call that even an immediate reopening of the strait would require considerable time for global fuel flows to normalize, underscoring the complexity of supply chain recovery.

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