US Refiner Stocks Rally as Diesel Crack Spreads Hit Record Highs

Key Facts

1Marathon Petroleum, HF Sinclair, and Phillips 66 recorded gains for the sixth consecutive week.

2Diesel crack spreads have reached an all-time record high.

Amid a global supply squeeze reshaping energy sector profitability, US refining companies are experiencing a robust surge in market performance. According to reports, Marathon Petroleum, HF Sinclair, and Phillips 66 have recorded stock gains for the sixth consecutive week. This momentum is driven by diesel refining margins, or crack spreads, reaching all-time record highs, significantly benefiting firms with substantial refining capacity.

Market movements clearly reflect this optimism as refining spreads between crude oil and finished products widen. Per market data, Marathon Petroleum (MPC) closed at $421.96, while Phillips 66 (PSX) stood at $274.21, and HF Sinclair (DINO) reached $116.62, based on closing prices from September 17, 2026.

Looking ahead, traders are monitoring support and resistance levels based on recent price action, with MPC hitting a daily high of $423.83 as of the September 17, 2026 close. In the absence of major upcoming energy-specific economic catalysts, focus remains on the sustainability of diesel margins following the API Crude Oil Stock Change report, which showed a 7.14 million barrel shift on September 15.