Shares of Cabot Corporation (CBT) tumbled 5.61% in after-hours trading on Monday following the company's fourth-quarter earnings release that fell short of analyst expectations on revenue and provided a cautious outlook for the coming fiscal year.

The Boston-based specialty chemicals and performance materials company reported Q4 sales of $899 million, significantly below the consensus estimate of $962.9 million. While Cabot's adjusted earnings per share of $1.70 met analyst expectations, the revenue miss and conservative guidance for fiscal year 2026 appeared to disappoint investors.

Looking ahead, Cabot forecast fiscal 2026 adjusted earnings per share in the range of $6.00 to $7.00, which suggests potential headwinds compared to the $7.25 adjusted EPS achieved in fiscal 2025. The company cited ongoing macroeconomic uncertainties and competitive pressures in its Reinforcement Materials segment as factors impacting its outlook.

Sean Keohane, Cabot's President and CEO, commented on the challenging environment: "Looking ahead to fiscal 2026, we do not yet see signs of improvement in the external environment, particularly as it relates to regional demand trends in Reinforcement Materials due to the impact of elevated Asian tire imports into western regions." This cautious tone likely contributed to the negative reaction from investors in after-hours trading.