C3is shares surge 38.72% after-hours after reporting 481% net income rise and expanding tanker fleet.

C3is Inc. surged 38.72% in after-hours trading following the release of its Q4 and full-year 2025 financial results, which highlighted a 481% year-over-year net income increase to $10.5 million and a 24% rise in fourth-quarter Time Charter Equivalent (TCE) rates to $19,469 per day. The company also announced agreements to acquire two product tankers for $39.8 million, expanding its fleet capacity by 387% pro forma and positioning it to capitalize on elevated tanker market rates. Strong operational metrics, including 93.5% fleet utilization in Q4 and a debt-free balance sheet with $14.9 million in cash, further reinforced investor confidence. The stock’s sharp rise aligns with the firm’s strategic expansion into the product tanker sector and improved profitability, driven by higher charter rates and disciplined cost management.