C3is shares surge 57.49% after-hours after reporting 481% net income jump and 387% fleet expansion.

C3is Inc. surged 57.49% in after-hours trading following the release of its Q4 2025 and full-year financial results, which highlighted a 481% year-over-year increase in net income to $10.5 million and a 244% rise in EBITDA to $17 million. The company attributed the performance to improved fleet utilization (93.5% operational efficiency) and strong tanker market conditions, with its Aframax tanker achieving daily voyage rates of $60,000. Strategic fleet expansion, including agreements to acquire two product tankers for $39.8 million, further bolstered investor confidence, signaling long-term growth potential. The stock’s sharp rise aligns with its reported $14.9 million cash balance and debt-free balance sheet, reinforcing the company’s financial resilience and expansionary momentum.