Exhibit 99.1 C3is Inc. C3is Inc. reports third quarter and nine months 2023 financial and operating results, with net revenues and net income representing increases of 378% and 1,018% respectively from the previous quarter. Athens, Greece, November 3, 2023 – C3is Inc. (Nasdaq: CISS) (the "Company"), a ship-owning company providing drybulk seaborne transportation services, and from Q3 2023, tanker transportation services, announced today its unaudited financial and operating results for the third quarter and ...