Calumet Specialty Products Partners LP (CLMT) experienced a significant pre-market plunge of 9.54% following the release of its fourth-quarter financial results.

The company reported quarterly sales of $1.039 billion, which fell short of the analyst consensus estimate of $1.058 billion. While the quarterly loss per share of $0.43 was in line with expectations in some reports, the sales miss was attributed to low industry renewable diesel margins, particularly impacting the Montana Renewables segment. The company noted that despite these challenges, it achieved approximately $100 million in cost reduction initiatives during the year.

For the full fiscal year 2025, Calumet posted a net loss of $33.8 million. The market's negative reaction in pre-market trading reflects investor concern over the revenue shortfall and the margin pressures in the renewable fuels sector highlighted in the earnings report.