Earnings release
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Exhibit 99.1 C3is Inc. C3is Inc. reports financial and operating results for the first quarter of 2025 Athens, Greece, May 15, 2025 – C3is Inc. (Nasdaq: CISS) (the “Company”), a ship-owning company providing dry bulk and tanker seaborne transportation services, announced today its unaudited financial and operating results for the first quarter ended March 31, 2025. OPERATIONAL AND FINANCIAL HIGHLIGHTS • Our handysize dry bulk carriers are on time charters of short-term durations, producing steady cash flows, while our Aframax tanker operates in the spot market, currently achieving voyage charter rates of around $46,000 per day. • All of our vessels are unencumbered. • Fleet operational utilization of 91.7% for the three months ended March 31, 2025, mainly due to the commercial idle days of the Aframax tanker operating in the spot market. Vessels operating under time charter employment had minimal idle days. • Revenues of $8.7 million for the three months ended March 31, 2025, corresponding to a daily TCE I of $16,202, as compared to revenues of $12.8 million for the three months ended March 31, 2024, corresponding to a daily TCE of $36,480. • Cash balance of $15.7 million at the end of Q1 2025. • For the first quarter of 2025, daily TCE decreased by 56% as compared to the same period in 2024. • Net Income of $7.9 million, EBITDAi of $9.7 million and Earnings per Share, Basic, of $14.89 for the three months ended March 31, 2025. • Adjusted net incomei of $1.2 million for the three months ended March 31, 2025, a decrease of 73% compared to $4.5 million for the three months ended March 31, 2024. • Adjusted EBITDAi of $3.0 million for the three months ended March 31, 2025, a decrease of 53% compared to $6.4 million for the three months ended March 31, 2024. 1
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• In April 2025, the Company paid $14.6 million to the sellers of the bulk carrier Eco Spitfire, thus concluding the final balance due, representing 90% of the purchase price of the vessel. The funds used were provided by operations, cash on hand and net proceeds from equity offerings. • The Company has met all of its Capex obligations, totaling $59.2million, without resorting to any bank loans. • The Company recorded a non-cash adjustment of $6.9 million as “Gain on Warrants” for the three months ended March 31, 2025, mainly due to the change in the fair value of warrants between December 31, 2024 and March 31, 2025. i TCE, EBITDA, Adjusted EBITDA and Adjusted Net Income are non-GAAP measures. Refer to the reconciliation of these measures to the most directly comparable financial measure in accordance with GAAP set forth later in this release. First Quarter 2025 Results: • Voyage revenues for the three months ended March 31, 2025 amounted to $8.7 million, a decrease of $4.1 million compared to revenues of $12.8 million for the three months ended March 31, 2024, primarily due to the decrease in charter rates. Total calendar days for our fleet were 360 days for the three months ended March 31, 2025, as compared to 273 days for the same period in 2024. Of the total calendar days in the first quarter of 2025, 247, or 68.6%, were time charter days, as compared to 164 or 60.1% for the same period in 2024. Our fleet utilization was 100.0% for both periods of three months ended March 31, 2025 and 2024. • Voyage expenses and vessels’ operating expenses for the three months ended March 31, 2025 were $2.8 million and $2.2 million, compared to $2.8 million and $1.8 million for the three months ended March 31, 2024. The increase in vessels’ operating expenses was attributed to the increase in the average number of our vessels. Voyage expenses for the three months ended March 31, 2025 included bunkers cost and port expenses of $1.5 million and $0.9 million respectively, corresponding to 54% and 32% of total voyage expenses, since the vessel Afrapearl II operated in the spot market. Operating expenses for the three months ended March 31, 2025 mainly included crew expenses of $1.1 million, corresponding to 50% of total operating expenses, spares and consumable costs of $0.4 million, corresponding to 18% of total vessel operating expenses, and maintenance expenses of $0.3 million, representing works and repairs on the vessels, corresponding to 14% of total vessel operating expenses. • Depreciation for the three months ended March 31, 2025 was $1.6 million, a $0.2 million increase from $1.4 million for the same period of last year, due to the increase in the average number of our vessels. • Management fees for the three months ended March 31, 2025 were $0.16 million, a $0.04 million increase from $0.12 million for the same period of last year, due to the increase in the average number of our vessels. • General and Administrative costs for the three-month periods ended March 31, 2025 and 2024 were $0.7 million and $1.5 million respectively. The decrease is mainly related to the decrease in expenses allocated to warrants issued as part of the two public offerings that occurred in the three-month period ended March 31, 2024 and classified as liabilities. 2
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• Interest and finance costs for the three months ended March 31, 2025 were $0.3 million and mainly related to the accrued interest expense – related party, in connection with the $14.6 million payable, representing 90% of the acquisition price of our bulk carrier, the Eco Spitfire; this balance was completely settled in April 2025. For the three months ended March 31, 2024, we reported $0.7 million as accrued interest expense – related party, in connection with $38.7 million payable, representing 90% of the acquisition price of our Aframax tanker, the Afrapearl II; this balance was completely settled in July 2024. For accounting purposes, the outstanding balances payable on the two vessels were required to be allocated between principal and imputed interest, despite the fact that no interest was contractually charged by the sellers. The total amounts ultimately paid remained consistent with the originally agreed purchase prices. • Interest income for the three months ended March 31, 2025 and 2024 was $0.1 million and $0.2 million respectively. The decrease is mainly attributed to a lower amount of funds placed under time deposits. • Gain on warrants for the three months ended March 31, 2025 was $6.9 million and mainly related to net fair value gains on our Class B-1, Class B-2, Class C-1 and Class C-2 warrants which were issued during the first quarter of 2024 in connection with the two public offerings and were classified as liabilities. • Adjusted net income was $1.2 million, corresponding to an Adjusted EPS, basic, of $1.05 for the three months ended March 31, 2025 compared to an Adjusted net income of $4.5 million corresponding to an Adjusted EPS, basic, of $32.28 for the same period of last year. • Adjusted EBITDA for the three months ended March 31, 2025 and 2024 amounted to $3.0 million and $6.4 million respectively. Reconciliations of Adjusted Net Income, EBITDA and Adjusted EBITDA to Net Income are set forth below. • An average of 4.0 vessels were owned by the Company during the three months ended March 31, 2025, compared to 3.0 vessels for the same period in 2024. CEO Dr. Diamantis Andriotis commented: For the first quarter of 2025, we reported a Net Income of $7.9 million, an increase of 109% from Q1 2024, but our Revenues decreased by 32%, due to the drop in TCE rates. By April 2025, we had successfully fulfilled all of our capital expenditure commitments without resorting to any bank loans. We have therefore more than trebled the deadweight tonnage of our fleet, which is exclusively non-Chinese built, without incurring any bank debts. The global economic environment is poised for a year of mixed signals in 2025, with risks and opportunities influencing the shipping sector. 3
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Economic shocks, financial market responses, and evolving policy measures are expected to shape the outlook, contributing to a cautious, yet dynamic landscape. Whilst global growth may be moderate, and inflationary pressures persist, these challenges also create room for market adjustments and new trade patterns. C3is will adapt to these evolving dynamics by focusing on diversification and aligning with the growing emphasis on sustainable practices, which are poised to reshape trade in the coming years. With careful navigation and adaptability, the Company is well-positioned to leverage regional growth drivers and evolving economic dynamics to maintain resilience in the year ahead. We would like to thank you for joining us today and look forward to having you with us again at our next call for the results of the 2nd quarter of 2025. Conference Call details: On May 15, 2025, at 10:00 am ET, the Company’s management will host a conference call to present the results and the company’s operations and outlook. Slides and audio webcast: There will also be a live and then archived webcast of the conference call, through C3is Inc. website (www.c3is.pro). Participants to the live webcast should register on the website approximately 10 minutes prior to the start of the webcast. ABOUT C3IS INC. C3is Inc. is a ship-owning company providing drybulk and crude oil seaborne transportation services. The Company owns four vessels, three Handysize drybulk carriers with a total capacity of 97,664 deadweight tons (dwt) and an Aframax oil tanker with a cargo carrying capacity of approximately 115,800 dwt, resulting in a fleet total capacity of 213,464 dwt. C3is Inc.’s shares of common stock are listed on the Nasdaq Capital Market and trade under the symbol “CISS”. Forward-Looking Statements Matters discussed in this release may constitute forward-looking statements. Forward-looking statements reflect our current views with respect to future events and financial performance and may include statements concerning plans, objectives, goals, strategies, future events or performance including our intentions relating to fleet growth and diversification and financing, outlook for our shipping sectors and vessel earnings, and our ability to maintain compliance with Nasdaq continued listing requirements, and underlying assumptions and other statements, which are other than statements of historical facts. The forward-looking statements in this release are based upon various assumptions, many of which are based, in turn, upon further assumptions, including without limitation, management’s examination of historical operating trends, data contained in our records 4
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and other data available from third parties. Although C3is Inc. believes that these assumptions were reasonable when made, because these assumptions are inherently subject to significant uncertainties and contingencies which are difficult or impossible to predict and are beyond our control, C3is Inc. cannot assure you that it will achieve or accomplish these expectations, beliefs or projections. Important factors that, in our view, could cause actual results to differ materially from those discussed in the forward-looking statements include risks discussed in our filings with the SEC and the following: the strength of world economies and currencies, geopolitical conditions, including any trade disruptions resulting from tariffs imposed by the United States or other countries, general market conditions, including changes in charter hire rates and vessel values, charter counterparty performance, changes in demand that may affect attitudes of time charterers to scheduled and unscheduled drydockings, shipyard performance, changes in C3is Inc.’s operating expenses, including bunker prices, drydocking and insurance costs, ability to fund the remaining purchase price for one of our drybulk vessels, ability to obtain financing and comply with covenants in our financing arrangements, actions taken by regulatory authorities, potential liability from pending or future litigation, domestic and international political conditions, the conflict in Ukraine and related sanctions, the conflict in the Middle East, potential disruption of shipping routes due to ongoing attacks by Houthis in the Red Sea and Gulf of Aden or accidents and political events or acts by terrorists. Risks and uncertainties are further described in reports filed by C3is INC. with the U.S. Securities and Exchange Commission. Company Contact: Nina Pyndiah Chief Financial Officer C3is INC. 00-30-210-6250-001 E-mail: info@c3is.pro 5
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Fleet Data: The following key indicators highlight the Company’s operating performance during the periods ended March 31, 2024 and March 31, 2025. FLEET DATA Q1 2024 Q1 2025 Average number of vessels (1) 3.00 4.00 Period end number of owned vessels in fleet 3 4 Total calendar days for fleet (2) 273 360 Total voyage days for fleet (3) 273 360 Fleet utilization (4) 100.0% 100.0% Total charter days for fleet (5) 164 247 Total spot market days for fleet (6) 109 113 Fleet operational utilization (7) 93.4% 91.7% 1) Average number of vessels is the number of owned vessels that constituted our fleet for the relevant period, as measured by the sum of the number of days each vessel was a part of our fleet during the period divided by the number of calendar days in that period. 2) Total calendar days for fleet are the total days the vessels we operated were in our possession for the relevant period including off-hire days associated with repairs, drydockings or special or intermediate surveys. 3) Total voyage days for fleet reflect the total number of days the vessels we operated were in our possession for the relevant period, net of off-hire days associated with repairs, drydockings or special or intermediate surveys. 4) Fleet utilization is the percentage of time that our vessels were available for revenue generating voyage days, and is determined by dividing voyage days by fleet calendar days for the relevant period. 5) Total charter days for fleet are the number of voyage days the vessels operated on time charters for the relevant period. 6) Total spot market charter days for fleet are the number of voyage days the vessels operated on spot market charters for the relevant period. 7) Fleet operational utilization is the percentage of time that our vessels generated revenue, and is determined by dividing voyage days excluding idle days by fleet calendar days for the relevant period. Reconciliation of Adjusted Net Income, EBITDA, adjusted EBITDA and adjusted EPS: Adjusted net income represents net income before (loss)/gain on warrants and share based compensation. EBITDA represents net income before interest and finance costs, interest income and depreciation. Adjusted EBITDA represents net income before interest and finance costs, interest income, depreciation, (loss)/gain on warrants and share based compensation. Adjusted EPS represents Adjusted net income divided by the weighted average number of shares. EBITDA, adjusted EBITDA, adjusted net income and adjusted EPS are not recognized measurements under U.S. GAAP. Our calculation of EBITDA, adjusted EBITDA, adjusted net income and adjusted EPS may not be comparable to that reported by other companies in shipping or other industries. In evaluating Adjusted EBITDA, Adjusted net income and Adjusted EPS, you should be aware that in the future we may incur expenses that are the same as, or similar to, some of the adjustments in this presentation. 6
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EBITDA, adjusted EBITDA, adjusted net income and adjusted EPS are included herein because they are a basis upon which we and our investors assess our financial performance. They allow us to present our performance from period to period on a comparable basis and provide investors with a means of better evaluating and understanding our operating performance. (Expressed in United States Dollars,except number of shares) Q1 2024 Q1 2025 Net Income - Adjusted Net Income Net income 3,786,620 7,916,841 Plus/(less) loss/(gain) on warrants 629,871 (6,866,761) Plus share based compensation 63,464 113,628 Adjusted Net Income 4,479,955 1,163,708 Net Income – EBITDA Net income 3,786,620 7,916,841 Plus interest and finance costs 752,546 330,545 Less interest income (209,178) (149,760) Plus depreciation 1,382,297 1,625,471 EBITDA 5,712,285 9,723,097 Net Income - Adjusted EBITDA Net income 3,786,620 7,916,841 Plus/(less) loss/(gain) on warrants 629,871 (6,866,761) Plus share based compensation 63,464 113,628 Plus interest and finance costs 752,546 330,545 Less interest income (209,178) (149,760) Plus depreciation 1,382,297 1,625,471 Adjusted EBITDA 6,405,620 2,969,964 EPS Numerator Net income 3,786,620 7,916,841 Less: Cumulative dividends on preferred shares (189,583) (187,500) Less: Undistributed earnings allocated to non-vested shares (8,803) (341,382) Less: Down round deemed dividend on Series A Perpetual Convertible Preferred Shares (2,862,000) (462,000) Net income attributable to common shareholders, basic 726,234 6,925,959 Denominator Weighted average number of shares 43,716 465,245 EPS - Basic 16.61 14.89 7
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Adjusted EPS Numerator Adjusted net income 4,479,955 1,163,708 Less: Cumulative dividends on preferred shares (189,583) (187,500) Less: Undistributed earnings allocated to non-vested shares (17,106) (24,155) Less: Down round deemed dividend on Series A Perpetual Convertible Preferred Shares (2,862,000) (462,000) Adjusted net income attributable to common shareholders, basic 1,411,266 490,053 Denominator Weighted average number of shares 43,716 465,245 Adjusted EPS, Basic 32.28 1.05 Reconciliation of TCE: Time Charter Equivalent rate or “TCE” rate is determined by dividing voyage revenue net of voyage expenses by voyage days for the relevant time period. TCE is a non-GAAP measure which provides additional meaningful information in conjunction with voyage revenues, the most directly comparable GAAP measure to Time charter equivalent revenues assisting the Company’s management in making decisions regarding the deployment and use of its vessels and in evaluating their financial performance. TCE is also a standard shipping industry performance measure used primarily to compare period-to-period changes in a shipping company’s performance despite changes in the mix of charter types (i.e., spot charters or time charters) under which the vessels may be employed between the periods. TCE assists our investors to assess our financial performance from period to period on a comparable basis and provides investors with a means of better evaluating and understanding our operating performance. (Expressed in U.S. Dollars except for available days andTime charter equivalent rate) Q1 2024 Q1 2025 Voyage revenues 12,792,011 8,670,664 Voyage expenses (2,832,992) (2,837,998) Time charter equivalent revenues 9,959,019 5,832,666 Total voyage days for fleet 273 360 Time charter equivalent rate 36,480 16,202 8
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C3is Inc. Unaudited Condensed Consolidated Statements of Operations (Expressed in United States Dollars, except for number of shares) Q1 2024 Q1 2025 Revenues Revenues 12,792,011 8,670,664 Total revenues 12,792,011 8,670,664 Expenses Voyage expenses 2,671,089 2,729,019 Voyage expenses – related party 161,903 108,979 Vessels’ operating expenses 1,777,270 2,129,489 Vessels’ operating expenses – related party 33,500 32,500 Management fees – related party 120,120 158,400 General and administrative expenses 1,394,907 527,788 General and administrative expenses – related party 111,436 124,826 Depreciation 1,382,297 1,625,471 Total expenses 7,652,522 7,436,472 Income from operations 5,139,489 1,234,192 Other (expenses)/income Interest and finance costs (1,929) (1,963) Interest and finance costs – related party (750,617) (328,582) Interest income 209,178 149,760 Foreign exchange loss (179,630) (3,327) (Loss)/gain on warrants (629,871) 6,866,761 Other (expenses)/income, net (1,352,869) 6,682,649 Net income 3,786,620 7,916,841 Earnings per share (ii) - Basic 16.61 14.89 - Diluted 16.61 0.01 Weighted average number of shares - Basic 43,716 465,245 - Diluted 43,716 23,828,240 ii The computation of earnings per share gives retroactive effect to the shares issued in connection with the spin-off of our company from Imperial Petroleum Inc. in June 2023 and to the reverse stock splits effected in April 2024, in January 2025 and in April 2025. 9
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C3is Inc. Unaudited Condensed Consolidated Balance Sheets (Expressed in United States Dollars) December 31,2024 March 31,2025 Assets Current assets Cash and cash equivalents 4,640,343 15,691,873 Time deposits 7,948,706 — Trade and other receivables 2,815,442 3,096,302 Other current assets — 649,692 Inventories 884,148 1,602,619 Advances and prepayments 21,951 18,630 Operating lease right-of-use assets 28,768 12,896 Total current assets 16,339,358 21,072,012 Non current assets Vessels, net 84,149,805 82,524,334 Total non current assets 84,149,805 82,524,334 Total assets 100,489,163 103,596,346 Liabilities and Stockholders’ Equity Current liabilities Trade accounts payable 908,342 1,849,586 Payable to related parties 16,319,561 17,649,881 Accrued and other liabilities 1,272,095 1,228,809 Operating lease liabilities 28,768 12,896 Deferred income 162,108 80,677 Total current liabilities 18,690,874 20,821,849 Non current liabilities Warrant liability 10,437,034 3,570,273 Total non current liabilities 10,437,034 3,570,273 Total liabilities 29,127,908 24,392,122 Commitments and contingencies Stockholders’ equity Capital stock 7,065 7,065 Preferred stock, Series A 6,000 6,000 Additional paid-in capital 71,091,138 71,666,766 Retained earnings 257,052 7,524,393 Total stockholders’ equity 71,361,255 79,204,224 Total liabilities and stockholders’ equity 100,489,163 103,596,346 10
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C3is Inc. Unaudited Condensed Consolidated Statements of Cash Flows (Expressed in United States Dollars) 3M 2024 3M 2025 Cash flows from operating activities Net income for the period 3,786,620 7,916,841 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 1,382,297 1,625,471 Share based compensation 63,464 113,628 Unrealized foreign exchange loss on time deposits 131,511 — Unrealized loss/(gain) on warrants 629,871 (6,866,761) Non-cash lease expense — 15,872 Offering costs attributable to warrant liability 1,078,622 — Changes in operating assets and liabilities: (Increase)/decrease in Trade and other receivables 6,207,998 (280,860) Other current assets 33,846 (649,692) Inventories (223,519) (718,471) Advances and prepayments 25,328 3,321 Increase/(decrease) in Trade accounts payable 463,315 941,244 Changes in operating lease liabilities — (15,872) Payable to related parties 999,777 1,334,487 Accrued liabilities 251,052 (43,286) Deferred income (36,510) (81,431) Net cash provided by operating activities 14,793,672 3,294,491 Cash flows from investing activities Acquisition and improvement of vessels (6,801,175) — Increase in bank time deposits 8,253,181 — Maturity of bank time deposits — 7,948,706 Net cash provided by in investing activities 1,452,006 7,948,706 Cash flows from financing activities Proceeds from follow-on offerings 13,147,990 — Stock issuance costs (1,733,711) — Dividends paid on preferred shares (191,667) (191,667) Net cash provided by/(used in) financing activities 11,222,612 (191,667) Net increase in cash and cash equivalents 27,468,290 11,051,530 Cash and cash equivalents at beginning of period 695,288 4,640,343 Cash and cash equivalents at end of period 28,163,578 15,691,873 11