# EDGAR Filing Document

**Accession Number:** 0001951067
**File Stem:** 0001193125-25-193988
**Filing Date:** 2025-9
**Character Count:** 40693
**Document Hash:** 2e57e33f7f83882ca914fc0931f54687
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-193988.hdr.sgml**: 20250902

**ACCESSION NUMBER**: 0001193125-25-193988

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20250902

**FILED AS OF DATE**: 20250902

**DATE AS OF CHANGE**: 20250902

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** C3is Inc.
- **CENTRAL INDEX KEY:** 0001951067
- **STANDARD INDUSTRIAL CLASSIFICATION:** DEEP SEA FOREIGN TRANSPORTATION OF FREIGHT [4412]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 000000000
- **STATE OF INCORPORATION:** 1T
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41717
- **FILM NUMBER:** 251285122

**BUSINESS ADDRESS:**
- **STREET 1:** 331 KIFISSIAS AVENUE
- **STREET 2:** ERITHREA
- **CITY:** ATHENS
- **STATE:** J3
- **ZIP:** 14561
- **BUSINESS PHONE:** 011-30-210-625-0001

**MAIL ADDRESS:**
- **STREET 1:** 331 KIFISSIAS AVENUE
- **STREET 2:** ERITHREA
- **CITY:** ATHENS
- **STATE:** J3
- **ZIP:** 14561

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**FORM 6-K** 

**REPORT OF FOREIGN PRIVATE ISSUER** 

**PURSUANT TO RULE 13a-16 OR 15d-16** 

**UNDER THE SECURITIES EXCHANGE ACT OF 1934** 

**For the month of September 2025** 

**Commission File Number 001-41717** 

## C3IS INC.
**(Translation of registrant's name into English)** 

**331 Kifissias Avenue Erithrea 14561 Athens, Greece** 

**(Address of principal executive office)** 

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

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**INFORMATION CONTAINED IN THIS FORM 6-K REPORT** 

**Financial and Operating Results for the three and six months ended June 30, 2025** 

Attached to this report on Form 6-K as Exhibit 99.1 is a copy of C3is Inc.'s (the "Company") press release, dated September 2, 2025, announcing its preliminary financial and operating results for the three and six months ended June 30, 2025.

**EXHIBIT INDEX** 

99.1 [Press Release dated September 2, 2025](d29081dex991.htm)

**\*\*\*\*\*** 

Neither C3is Inc.'s independent accountants, nor any other independent accountants, have compiled, examined, or performed any procedures with respect to the preliminary financial results for the three and six months ended June 30, 2025 and 2024, nor have they expressed any opinion or any other form of assurance on such information, and assume no responsibility for, and disclaim any association with, the preliminary financial results.

This report on Form 6-K, including exhibit 99.1 hereto other than the section entitled "CEO Dr. Diamantis Andriotis Commented:", is hereby incorporated by reference into the Company's Registration Statement on Form S-8 (Reg. No. 333-273306) filed with the Securities and Exchange Commission on July 18, 2023 and Registration Statement on Form F-3 (Reg. No. 333- 285135) filed with the Securities and Exchange Commission on February 21, 2025.

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**SIGNATURES** 

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: September 2, 2025

---

| | |
|:---|:---|
| C3IS INC. | C3IS INC. |
| By: | /s/ Nina Pyndiah |
| Name: | Nina Pyndiah |
| Title: | Chief Financial Officer |

---

## Exhibit 99.1

**Exhibit 99.1**![LOGO](g29081dsp1.gif)

**<u>C3is Inc.</u>** 

**C3is Inc. reports second quarter and six months 2025 financial and operating results** 

**Athens, Greece, September 2, 2025** – C3is Inc. (Nasdaq: CISS) (the "Company"), a ship-owning company providing drybulk and tanker seaborne transportation services, announced today its unaudited financial and operating results for the second quarter and six months ended June 30, 2025.

**OPERATIONAL AND FINANCIAL HIGHLIGHTS** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• 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 $25,000 per day.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• All of our vessels are unencumbered.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Fleet operational utilization of 78% for the three months ended June 30, 2025, mainly due to the commercial
idle days of the Aframax tanker operating in the spot market. Vessels operating under time charter employment had less idle days.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Revenues of $10.7 million for the three months ended June 30, 2025, corresponding to a daily TCE<sup>1</sup> of $16,466, as compared to revenues of $10.8 million for the three months ended June 30, 2024, which corresponded to a daily TCE of $23,938.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Cash and cash equivalents and time deposits balance of $2.3 million at the end of Q2 2025.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• For the second quarter of 2025, daily TCE decreased by 31% as compared to the same period in 2024.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Net Loss of $5.3 million, EBITDA<sup>1</sup> of $(3.7)
million and Loss per Share, Basic, of $8.78 for the three months ended June 30, 2025.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• For the six months ended June 30, 2025, we reported a Net Income of $2.6 million and Earnings per
Share, Basic, of $0.52.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Adjusted net income<sup>1</sup> of $1.1 million for the three
months ended June 30, 2025, a decrease of 62% compared to $2.9 million for the three months ended June 30, 2024.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Adjusted EBITDA<sup>1</sup> of $2.8 million for the three months
ended June 30, 2025, a decrease of 43% compared to $4.9 million for the three months ended June 30, 2024.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• In April 2025, the Company settled the outstanding balance of $14.6 million due to the sellers of the bulk
carrier Eco Spitfire, 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.

<sup>1</sup> 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.

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• The Company has met all of its capital expenditure commitments, totalling $59.2 million, without resorting
to any bank loans. These expenditures mainly related to the acquisitions of our Aframax tanker, the Afrapearl II, and our bulk carrier, the Eco Spitfire.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• The Company recorded a non-cash adjustment of $6.4 million as
"Loss on Warrants" for the three months ended June 30, 2025, mainly due to the change in the fair value of warrants between March 31, 2025 and June 30, 2025.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• In August 2025, our Aframax tanker, the Afrapearl II, successfully completed its dry-docking, over 23 days at a cost of approximately $1.3 million.

**Second Quarter 2025 Results:** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Voyage revenues</u> for the three months ended June 30, 2025 amounted to $10.7 million, a decrease
of $0.1 million compared to revenues of $10.8 million for the three months ended June 30, 2024, primarily due to the decrease in the average TCE rates of our vessels. Total calendar days for our fleet were 364 days for the three
months ended June 30, 2025, as compared to 325 days for the same period in 2024. Of the total calendar days in the second quarter of 2025, 217, or 59.6%, were time charter days, as compared to 203 or 62.5% for the same period in 2024. Our fleet
operational utilization was 78.0% and 87.7% for the three months ended June 30, 2025 and 2024, respectively.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Voyage expenses and vessels</u> <u>'</u> <u>operating expenses</u> for the three months ended
June 30, 2025 were $4.7 million and $2.4 million, respectively, compared to $3.1 million and $2.0 million for the three months ended June 30, 2024. The increases in both voyage expenses and vessels' operating
expenses are attributed to the increase in the average number of our vessels. Voyage expenses for the three months ended June 30, 2025 included bunkers cost and port expenses of $2.4 million and $2.3 million, respectively,
corresponding to 51% and 49% of total voyage expenses, since our tanker, the Afrapearl II, operated primarily in the spot market. Operating expenses for the three months ended June 30, 2025 mainly included crew expenses of $1.3 million,
corresponding to 54% of total operating expenses, spares and consumables costs of $0.5 million, corresponding to 21% of total vessel operating expenses, and maintenance expenses of $0.3 million, representing works and repairs on the
vessels, corresponding to 13% of total vessel operating expenses.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Depreciation</u> for the three months ended June 30, 2025 was $1.6 million, a $0.1 million
increase from $1.5 million for the same period of last year, due to the increase in the average number of our vessels.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Management fees</u> for the three months ended June 30, 2025 were $0.16 million, a
$0.02 million increase from $0.14 million for the same period of last year, due to the increase in the average number of our vessels.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>General and Administrative costs</u> for the three months ended June 30, 2025 and 2024 were
$0.7 million and $0.6 million, respectively. The $0.1 million increase is primarily due to an increase in stock-based compensation costs.

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Interest and finance costs</u> for the three months ended June 30, 2025 and 2024 were $0.04 million
and $0.9 million, respectively. This decrease is related to the accrued interest expense – related party, in connection with the $53.3 million, part of the acquisition prices of our Aframax tanker, the Afrapearl II - which was
completely repaid in July 2024 - and our bulk carrier, the Eco Spitfire, which was completely repaid in April 2025.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Interest income</u> for the three months ended June 30, 2025 and 2024 was $0.03 million and
$0.4 million, respectively. This decrease is due to the reduction in time deposits held by the Company, after the settlement of the balance due on the bulk carrier, the Eco Spitfire.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Loss on warrants</u> for the three months ended June 30, 2025 was $6.4 million whereas loss on
warrants for the three months ended June 30, 2024 was $14.5 million. This change related to net fair value losses on our Class B-1 and B-2 Warrants and Class C-1 and C-2 warrants and were classified as liabilities.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Net Loss</u> of $5.3 million and related EPS of ($8.78).

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Adjusted net income</u> was $1.1 million corresponding to an Adjusted (loss)/earnings per share
("EPS"), basic, of ($0.51) for the three months ended June 30, 2025, compared to an Adjusted Net Income of $2.9 million corresponding to an Adjusted EPS, basic, of $6.15 for the same period of last year. Reconciliations of
Adjusted Net Income, EBITDA and Adjusted EBITDA to Net Income are set forth below.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Adjusted EBITDA</u> for the three months ended June 30, 2025 and 2024 amounted to $2.8 million and
$4.9 million, respectively. An average of 4.0 vessels were owned by the Company during the three months ended June 30, 2025 compared to 3.6 vessels for the same period in 2024.

**Six months 2025 Results:** 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Voyage revenues</u> for the six months ended June 30, 2025 amounted to $19.4 million, a decrease of
$4.2 million compared to revenues of $23.6 million for the six months ended June 30, 2024, primarily due to the decrease in the average TCE rate of our vessels. Total calendar days for our fleet were 724 days for the six months ended
June 30, 2025, as compared to 598 days for the same period in 2024. Of the total calendar days in the first six months of 2025, 464 or 64.1%, were time charter days, as compared to 367 or 61.4% for the same period in 2024. Our fleet operational
utilization was 84.8% and 90.3% for the six months ended June 30, 2025 and 2024, respectively.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Voyage expenses and vessels' operating expenses</u> for the six months ended June 30, 2025 were
$7.6 million and $4.6 million, compared to $6.0 million and $3.8 million for the six months ended June 30, 2024. The increases in both voyage expenses and vessels' operating expenses are attributed to the increase in
the average number of our vessels. Voyage expenses for the six months ended June 30, 2025 mainly included bunker costs of $3.9 million, corresponding to 51% of total voyage expenses, and port expenses of $3.2 million, corresponding to
42% of total voyage expenses, since our tanker, the Afrapearl II, operated primarily in the spot market. Operating expenses for the six months ended June 30, 2025 mainly included crew expenses of $2.4 million, corresponding to 52% of total
operating expenses, spares and consumables costs of $0.9 million, corresponding to 20%, and maintenance expenses of $0.6 million, representing works and repairs on the vessels, corresponding to 13% of total vessel operating expenses.

------

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Depreciation</u> for the six months ended June 30, 2025 was $3.3 million, a $0.4 million
increase from $2.9 million for the same period of last year, due to the increase in the average number of our vessels.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Management fees</u> for the six months ended June 30, 2025 and 2024 were $0.3 million for both
periods.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>General and Administrative costs</u> for the six months ended June 30, 2025 and 2024 were
$1.3 million and $2.1 million, respectively. The $0.8 million decrease mainly related to expenses incurred in the six months ended June 2024 relating to the two public offerings.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Interest and finance costs</u> for the six months ended June 30, 2025 and 2024 were $0.4 million and
$1.7 million, respectively. The $1.3 million decrease is related to the accrued interest expense – related party, in connection with the $53.3 million, part of the acquisition prices of our Aframax tanker, the Afrapearl II -
which was completely repaid in July 2024 - and our bulk carrier, the Eco Spitfire, which was completely repaid in April 2025.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Interest income</u> for the six months ended June 30, 2025 and 2024 was $0.2 million and
$0.6 million respectively. The decrease of $0.4 million is due to the reduction in time deposits held by the Company, after the settlement of the balance due on the bulk carrier, the Eco Spitfire.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Gain on warrants</u> for the six months ended June 30, 2025 was $0.5 million as compared with the
loss on warrants of $15.2 million for the six months ended June 30, 2024, and mainly related to the net fair value changes on our Class B-1 and B-2 Warrants and Class C-1 and C-2 warrants and were classified as liabilities.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Net Income</u> of $2.6 million and related EPS of $0.52.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Adjusted Net Income</u> was $2.3 million, corresponding to an Adjusted EPS, basic, of $0.15 for the six
months ended June 30, 2025, compared to an adjusted net income of $7.3 million, corresponding to an Adjusted EPS, basic, of $17.41 for the same period of the last year. Reconciliations of Adjusted Net Income, EBITDA and Adjusted EBITDA to
Net Income are set forth below.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• <u>Adjusted EBITDA</u> for the six months ended June 30, 2025 and 2024 amounted to $5.8 million and
$11.3 million respectively.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• An average of 4.0 vessels were owned by the Company during the six months ended June 30, 2025 compared to
3.3 vessels for the same period of 2024.

------

**CEO Dr. Diamantis Andriotis commented:** 

For the first half of 2025, we reported Voyage Revenues of $19.4 million, EBITDA of $6.0 million, Net Income of $2.6 million, and EPS of $0.52.

In April 2025 we paid off the remaining balance of $14.6 million due on our bulk carrier, the Eco Spitfire. In August 2025, we successfully completed the dry-docking of our Aframax tanker, the Afrapearl II.

Major changes in the maritime shipping industry were caused by extensive transitions in the world due to geopolitical factors, environmental regulations, demand patterns and weather-related challenges. Despite these shifting dynamics, C3is Inc.'s performance remained solid, with an increase of its fleet capacity by over 230% since inception, without incurring any bank debt.

We are fully deleveraged, thus significantly enhancing our financial flexibility. This financial position provides a strong foundation for our future growth.

Our performance so far has demonstrated our resilience and strategic focus; we are confident that we have established foundations that are adaptable to this changing environment, thereby enhancing our fundamental ability to both further develop existing core businesses, as well as explore potential new growth businesses.

**Conference Call details:** 

On September 2, 2025, at 11:00 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, and outlook for our

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shipping sectors and vessel earnings, 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 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: our ability to maintain compliance with Nasdaq continued listing requirements, the strength of world economies and currencies, geopolitical conditions, including any trade disruptions resulting from tariffs or other protectionist measures 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 obtain financing and comply with covenants in any financing arrangements, actions taken by regulatory authorities, potential liability from pending or future litigation, domestic and international political conditions, including the conflict in Ukraine and related sanctions and the conflict in Israel and Gaza, 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

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**Fleet Data:** 

The following key indicators highlight the Company's operating performance during the periods ended June 30, 2024 and June 30, 2025.

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| | | | | |
|:---|:---|:---|:---|:---|
| **FLEET DATA** | **Q2 2024** | **Q2 2025** | **6M 2024** | **6M 2025** |
|  Average number of vessels <sup>(1)</sup> | 3.6 | 4.0 | 3.3 | 4.0 |
|  Period end number of owned vessels in fleet | 4 | 4 | 4 | 4 |
|  Total calendar days for fleet <sup>(2)</sup> | 325 | 364 | 598 | 724 |
|  Total voyage days for fleet <sup>(3)</sup> | 321 | 364 | 594 | 724 |
|  Fleet utilization <sup>(4)</sup> | 98.8% | 100.0% | 99.3% | 100.0% |
|  Total charter days for fleet <sup>(5)</sup> | 203 | 217 | 367 | 464 |
|  Total spot market days for fleet <sup>(6)</sup> | 118 | 147 | 227 | 260 |
|  Fleet operational utilization <sup>(7)</sup> | 87.7% | 78.0% | 90.3% | 84.8% |

---

1) <u>Average number of vessels</u> 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) <u>Total calendar days</u> 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) <u>Total voyage days</u> for fleet reflect the total 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) <u>Fleet utilization</u> 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) <u>Total charter days</u> for fleet are the number of voyage days the vessels operated on time or bareboat charters for the relevant period. 

6) <u>Total spot market charter days</u> for fleet are the number of voyage days the vessels operated on spot market charters for the relevant period. 

7) <u>Fleet operational utilization</u> is the percentage of time that our vessels generated revenue and is determined by dividing voyage days excluding commercially 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 (loss)/income before loss/(gain) on warrants and share based compensation. EBITDA represents net (loss)/income before interest and finance costs, interest income and depreciation. Adjusted EBITDA represents net (loss)/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 the 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.

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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. Management also uses these non-GAAP financial measures in making financial, operating and planning decisions and in evaluating our performance.

---

| | | | | |
|:---|:---|:---|:---|:---|
| **(Expressed in United States Dollars,**<br> **except number of shares)** | **Second Quarter Ended June<br>30th,** | **Second Quarter Ended June<br>30th,** | **Six-Month Period Ended June<br>30th,** | **Six-Month Period Ended June<br>30th,** |
|  | **2024** | **2025** | **2024** | **2025** |
|  **<u>Net (Loss)/Income - Adjusted Net Income</u>** |  |  |  |  |
|  **Net (loss)/income** | **(11756952)** | **(5328450)** | **(7970332)** | **2588391** |
|  Plus/(less) loss/(gain) on warrants | 14546665 | 6358529 | 15176536 | (508232) |
|  Plus share based compensation | 63015 | 114890 | 126480 | 228518 |
|  **Adjusted Net income** | **2852728** | **1144969** | **7332684** | **2308677** |
|  **Net (Loss)/Income - EBITDA** |  |  |  |  |
|  **Net (loss)/income** | **(11756952)** | **(5328450)** | **(7970332)** | **2588391** |
|  Plus interest and finance costs | 947877 | 39582 | 1700423 | 370127 |
|  Less interest income | (433389) | (27504) | (642567) | (177264) |
|  Plus depreciation | 1544412 | 1625470 | 2926709 | 3250941 |
|  **EBITDA** | **(9698052)** | **(3690902)** | **(3985767)** | **6032195** |
|  **Net (Loss)/Income - Adjusted EBITDA** |  |  |  |  |
|  **Net (loss)/income** | **(11756952)** | **(5328450)** | **(7970332)** | **2588391** |
|  Plus loss/Less (gain) on warrants | 14546665 | 6358529 | 15176536 | (508232) |
|  Plus share based compensation | 63015 | 114890 | 126480 | 228518 |
|  Plus interest and finance costs | 947877 | 39582 | 1700423 | 370127 |
|  Less interest income | (433389) | (27504) | (642567) | (117264) |
|  Plus depreciation | 1544412 | 1625470 | 2926709 | 3250941 |
|  **Adjusted EBITDA** | **4911628** | **2782517** | **11317249** | **5752481** |
|  **<u>EPS</u>** |  |  |  |  |
|  **<u>Numerator</u>** |  |  |  |  |
|  Net (loss)/income | (11756952) | (5328450) | (7970332) | 2588391 |
|  Less: Cumulative dividends on preferred shares | (189583) | (189583) | (379166) | (377083) |
|  Less: Undistributed earnings allocated to non-vested shares |  |  |  | (11926) |
|  Less: Down round deemed dividend on Series A Perpetual Convertible Preferred Shares |  | (1356000) | (2862000) | (1818000) |
|  Net (loss)/income attributable to common shareholders, basic | (11946535) | (6874033) | (11211498) | 381382 |
|  **<u>Denominator</u>** |  |  |  |  |
|  Weighted average number of shares | 432757 | 782631 | 234474 | 733370 |
|  **EPS - Basic** | **(27.61)** | **(8.78)** | **(47.82)** | **0.52** |
|  **Adjusted EPS** |  |  |  |  |
|  **<u>Numerator</u>** |  |  |  |  |
|  Adjusted net income | 2852728 | 1144969 | 7332684 | 2308667 |
|  Less: Cumulative dividends on preferred shares | (189583) | (189583) | (379166) | (377083) |
|  Less: Undistributed earnings allocated to non-vested shares | (3257) |  | (9225) | (3444) |
|  Less: Down round deemed dividend on Series A Perpetual Convertible Preferred Shares |  | (1356000) | (2862000) | (1818000) |
|  Adjusted net income/(loss) attributable to common shareholders, basic | 2659888 | (400614) | 4082293 | 110150 |
|  **<u>Denominator</u>** |  |  |  |  |
|  Weighted average number of shares | 432757 | 782631 | 234477 | 733370 |
|  **Adjusted EPS** | **6.15** | **(0.51)** | **17.41** | **0.15** |

---

------

**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, but not bareboat charters) under which the vessels may be employed between the periods.

---

| | | | | |
|:---|:---|:---|:---|:---|
| **(Expressed in U.S. Dollars except for**<br> **available days and Time charter**<br> **equivalent rate)** | **Q2 2024** | **Q2 2025** | **6M 2024** | **6M 2025** |
|  Voyage revenues | 10827194 | 10737341 | 23619205 | 19408005 |
|  Voyage expenses | 3142982 | 4743553 | 5975974 | 7581551 |
|  **Time charter equivalent revenues** | **7684212** | **5993788** | **17643231** | **11826454** |
|  Total voyage days for fleet | 321 | 364 | 594 | 724 |
|  **Time charter equivalent rate** | **23938** | **16466** | **29702** | **16335** |

---

------

**C3is Inc.** 

**Unaudited Condensed Consolidated Statements of Operations** 

**(Expressed in United States Dollars, except for number of shares)** 

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | **Q2 2024** | **Q2 2025** | **6M 2024** | **6M 2025** |
|  **Revenues** |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Revenues | 10827194 | 10737341 | 23619205 | 19408005 |
|  **Total revenues** | **10827194** | **10737341** | **23619205** | **19408005** |
|  **Expenses** |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Voyage expenses | 3009046 | 4614730 | 5680135 | 7343749 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Voyage expenses – related party | 133936 | 128823 | 295839 | 237802 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Vessels' operating expenses | 1953301 | 2360493 | 3730571 | 4489982 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Vessels' operating expenses – related party | 33667 | 34000 | 67167 | 66500 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Drydocking costs |  | 78701 |  | 78701 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Management fees – related party | 143000 | 160160 | 263120 | 318560 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; General and administrative expenses | 490991 | 531893 | 1885898 | 1059681 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; General and administrative expenses – related party | 111623 | 145419 | 223059 | 270245 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Depreciation | 1544412 | 1625470 | 2926709 | 3250941 |
|  **Total expenses** | **7419976** | **9679689** | **15072498** | **17116161** |
|  **Income from operations** | **3407218** | **1057652** | **8546707** | **2291844** |
|  **Other (expenses)/income** | **Other (expenses)/income** |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Interest and finance costs | (6663) | (2229) | (8592) | (4192) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Interest and finance costs – related party | (941214) | (37353) | (1691831) | (365935) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Interest income | 433389 | 27504 | 642567 | 177264 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Foreign exchange loss | (103017) | (15495) | (282647) | (18822) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (Loss)/gain on warrants | (14546665) | (6358529) | (15176536) | 508232 |
|  **Other (expenses)/income, net** | **(15164170)** | **(6386102)** | **(16517039)** | **296547** |
|  **Net (loss)/income** | **(11756952)** | **(5328450)** | **(7970332)** | **2588391** |
|  **(Loss)/Earnings per share (ii)** | **(Loss)/Earnings per share (ii)** |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; - Basic | (27.61) | (8.78) | (47.82) | 0.52 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; - Diluted | (27.61) | (8.78) | (47.82) | (0.06) |
|  **Weighted average number of shares** | **Weighted average number of shares** | **Weighted average number of shares** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; - Basic | 432757 | 782631 | 234474 | 733370 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; - Diluted | 432757 | 782631 | 234474 | 1804320 |

---

ii The computation of (loss)/earnings per share gives retroactive effect to the reverse stock splits effected in April 2024, December 2024 and April 2025.

------

**C3is Inc.** 

**Unaudited Condensed Consolidated Balance Sheets** 

**(Expressed in United States Dollars)** 

---

| | | |
|:---|:---|:---|
|  | **December 31,<br>2024** | **June 30,<br>2025** |
|  **Assets** |  |  |
|  **Current assets** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Cash and cash equivalents | 4640343 | 675771 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Time deposits | 7948706 | 1600000 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Trade and other receivables | 2815442 | 5682159 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Other current assets |  | 27891 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Inventories | 884148 | 1142233 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Advances and prepayments | 21951 | 18193 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Operating lease right-of-use assets | 28768 | 58525 |
|  **Total current assets** | **16339358** | **9204772** |
|  **Non current assets** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Vessels, net | 84149805 | 80898864 |
|  **Total non current assets** | **84149805** | **80898864** |
|  **Total assets** | **100489163** | **90103636** |
|  **Liabilities and Stockholders' Equity** |  |  |
|  **Current liabilities** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Trade accounts payable | 908342 | 1350901 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Payable to related parties | 16319561 | 2964300 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Accrued and other liabilities | 1272095 | 1223554 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Operating lease liabilities | 28768 | 58525 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Deferred income | 162108 | 115667 |
|  **Total current liabilities** | **18690874** | **5712947** |
|  **Non current liabilities** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Warrant liability | 10437034 | 9799073 |
|  **Total non current liabilities** | **10437034** | **9799073** |
|  **Total liabilities** | **29127908** | **15512020** |
|  **Commitments and contingencies** |  |  |
|  **Stockholders' equity** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Capital stock | 7065 | 9239 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Preferred stock, Series A | 6000 | 6000 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Additional paid-in capital | 71091138 | 73926017 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Retained earnings | 257052 | 650360 |
|  **Total stockholders' equity** | **71361255** | **74591616** |
|  **Total liabilities and stockholders' equity** | **100489163** | **90103636** |

---

------

**C3is Inc.** 

**Unaudited Condensed Consolidated Statements of Cash Flows** 

**(Expressed in United States Dollars)** 

---

| | | |
|:---|:---|:---|
|  | **6M 2024** | **6M 2025** |
|  **Cash flows from operating activities** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Net (loss)/income for the period | (7970332) | 2588391 |
|  **Adjustments to reconcile net (loss)/income to net cash provided by operating activities:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Depreciation | 2926709 | 3250941 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Share based compensation | 126480 | 228518 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Unrealized foreign exchange loss on time deposits | 156921 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Loss/(gain) on warrants | 15176536 | (508232) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Noncash lease expense | 2386 | 33002 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Offering costs attributable to warrant liability | 1078622 |  |
|  **Changes in operating assets and liabilities:** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **(Increase)/decrease in** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Trade and other receivables | 7265016 | (2866717) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Other current assets | (64399) | (27891) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Inventories | (420139) | (258085) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Advances and prepayments | 35925 | 3758 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; **Increase/(decrease) in** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Trade accounts payable | 361504 | 442559 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Changes in operating lease liabilities | (2386) | (33002) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Payable to related parties | 2659029 | 27823 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Accrued and other liabilities | 244147 | (48541) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Deferred income | (183023) | (46441) |
|  **Net cash provided by operating activities** | **21392996** | **2786083** |
|  **Cash flows from investing activities** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Acquisition of vessel | (1623125) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Increase in bank time deposits | (20001175) | (1600000) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Maturity of bank time deposits | 15012671 | 7948706 |
|  **Net cash (used in)/provided by investing activities** | **(6611629)** | **6348706** |
|  **Cash flows from financing activities** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Proceeds from follow-on offerings | 13147990 |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Repayment of seller and capital expenditures financing |  | (13381000) |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Proceeds from exercise of warrants | 5852396 | 660806 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Stock issuance costs | (1778633) |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dividends paid on preferred shares | (381250) | (379167) |
|  **Net cash provided by/(used in) financing activities** | **16840503** | **(13099361)** |
|  Net increase/(decrease) in cash and cash equivalents | 31621870 | (3964572) |
|  **Cash and cash equivalents at beginning of period** | 695288 | 4640343 |
|  **Cash and cash equivalents at end of period** | **32317158** | **675771** |

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