IMPORTANT NOTICE ABOUT INFORMATION IN THIS PROSPECTUS SUPPLEMENT	s-i
CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS	s-ii
PROSPECTUS SUPPLEMENT SUMMARY	s-1
THE OFFERING	s-2
RISK FACTORS	s-3
USE OF PROCEEDS	s-6
CAPITALIZATION	s-7
SHARE HISTORY AND MARKETS	s-8
TAX CONSIDERATIONS	s-9
PLAN OF DISTRIBUTION	s-10
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT	s-11
OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION	s-12
LEGAL MATTERS	s-12
WHERE YOU CAN FIND ADDITIONAL INFORMATION	s-12

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS	2
PROSPECTUS SUMMARY	4
RISK FACTORS	5
SHARE HISTORY AND MARKETS	6
USE OF PROCEEDS	7
CAPITALIZATION	8
ENFORCEMENT OF CIVIL LIABILITIES	9
PLAN OF DISTRIBUTION	10
DESCRIPTION OF SHARE CAPITAL	12
DESCRIPTION OF DEBT SECURITIES	19
DESCRIPTION OF WARRANTS	25
DESCRIPTION OF PURCHASE CONTRACTS	26
DESCRIPTION OF RIGHTS	27
DESCRIPTION OF UNITS	28
EXPENSES	29
LEGAL MATTERS	29
EXPERTS	29
WHERE YOU CAN FIND ADDITIONAL INFORMATION	29

Vessel Name	Year Built	Type of Charter	Capacity (dwt)	Delivered to Castor	Earliest Charter Expiration	Latest Charter Expiration
Magic P	2004	Time Charter	76,453	September 2017	August 2019	November 2019 (1)

Common shares offered by us	Common shares with an aggregate offering price of up to $2,850,000 or 680,191 common shares at an assumed offering price of $4.19, which was the last reported closing price of our common shares on June 27, 2019.
Common shares outstanding prior to this offering	2,400,000 common shares.(1)
Preferred Share Purchase Rights	Our common shares include preferred share purchase rights, as described in the section of the accompanying prospectus entitled "Description of Capital Stock—Stockholders Rights Agreement."
Listing	Our common shares are traded on the Nasdaq Capital Market under the symbol “CTRM.” And the Norwegian OTC under the symbol “CASTOR.”
Manner of offering	Negotiated transactions or transactions deemed to be "at-the-market offerings" (including sales made to or through a market maker other than on an exchange) that may be made from time to time through Maxim, as sales agent, using commercially reasonable efforts. See "Plan of Distribution."
Use of Proceeds	The net proceeds of this offering will be used to opportunistically fund growth opportunities, which may include the purchase of vessels, general corporate purposes or a combination thereof. As of the date hereof, we have not identified a potential target vessel to acquire. We may also use the proceeds to fund our general working capital requirements.
Risk Factors	Investing in our common shares is speculative and involves substantial risk. You should carefully consider all the information in this prospectus supplement, the accompanying prospectus and the documents incorporated herein by reference prior to investing in our common shares. In particular, we urge you to consider carefully the factors set forth in the section entitled "Risk Factors" beginning on page S-4 of this prospectus supplement, as well as the accompanying prospectus and the documents we have filed with the SEC that are incorporated by reference herein for more information, before you make any investment in our common shares.

		As of March 31, 2019
		Actual				As Adjusted
(in U.S. dollars)
Debt:
Long-term debt		$	—			$	—
Total debt:		$	—			$	—
Shareholders' Equity:
Common Shares, $0.001 par value, 1,950,000 shares authorized, 2,400,000 shares issued and outstanding on an actual basis and 3,080,191 shares issued and outstanding on an as adjusted basis		$	2,400			$	3,080
Series A Preferred Shares 9.75% cumulative redeemable perpetual preferred shares, $0.001 par value, 480,000 shares issued and outstanding on an actual and as adjusted basis			480				480
Series B Preferred Shares $0.001 par value, 12,000 shares issued and outstanding on an actual and as adjusted basis			12				12
Additional paid-in capital			7,612,108				10,235,928
Retained Earnings			1,859,582				1,859,582
Total Shareholders' Equity:		$	9,474,582			$	12,099,082
Total capitalization		$	9,474,582			$	12,099,082

Name of Beneficial Owner		No. of Shares				Percentage
Thalassa Investment Co. S.A.(1)			1,124,094				46.8	%
Directors and Officers (excluding Petros Panagiotidis)(2)			0				0	%

SEC registration fee		$	340
Legal fees and expenses		$	120,000
FINRA fee		$	434
Accounting fees and expenses		$	15,000
Miscellaneous		$	4,226
Total		$	140,000	*

Through this prospectus, we may periodically offer:

The prices and other terms of the securities that we will offer will be determined at the time of their offering and will be described in a supplement to this prospectus.

The securities issued under this prospectus may be offered directly or through underwriters, agents or dealers. The names of any underwriters, agents or dealers will be included in a supplement to this prospectus.

This prospectus is part of a registration statement filed with the U.S. Securities and Exchange Commission, or the Commission, using a shelf registration process. Under the shelf registration process, we may sell our common shares (including preferred share purchase rights), preferred shares, debt securities, warrants, purchase contracts and units described in this prospectus in one or more offerings. This prospectus provides you with a general description of the securities we may offer. Each time we offer securities, we will provide you with a prospectus supplement that will describe the specific amounts, prices and terms of the offered securities. We may file a prospectus supplement in the future that may also add, update or change the information contained in this prospectus. You should read carefully both this prospectus and any prospectus supplement, together with the additional information described below.

This prospectus and any prospectus supplement are part of a registration statement we have filed with the Commission and do not contain all the information in the registration statement. Forms of the indentures and other documents establishing the terms of the offered securities are filed as exhibits to the registration statement. Statements in this prospectus or any prospectus supplement about these documents are summaries and each statement is qualified in all respects by reference to the document to which it refers. You should refer to the actual documents for a more complete description of the relevant matters. For further information about us or the securities offered hereby, you should refer to the registration statement, which you can obtain from the Commission as described below under the section entitled “Where You Can Find Additional Information.”

You should rely only on the information contained or incorporated by reference in this prospectus and in any prospectus supplement. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. You should assume that the information appearing in this prospectus and the applicable supplement to this prospectus is accurate as of the date on its respective cover, and that any information incorporated by reference is accurate only as of the date of the document incorporated by reference, unless we indicate otherwise. Our business, financial condition, results of operations and prospects may have changed since those dates.

Other than in the United States, no action has been taken by us or any underwriters that would permit a public offering of the common shares offered by this prospectus in any jurisdiction where action for that purpose is required. The common shares offered by this prospectus may not be offered or sold, directly or indirectly, nor may this prospectus or any other offering material or advertisements in connection with the offer and sale of any such shares be distributed or published in any jurisdiction, except under circumstances that will result in compliance with the applicable rules and regulations of that jurisdiction. Persons into whose possession this prospectus comes are advised to inform themselves about and to observe any restrictions relating to the offering and the distribution of this prospectus. This prospectus does not constitute an offer to sell or a solicitation of an offer to buy any common shares offered by this prospectus in any jurisdiction in which such an offer or a solicitation is unlawful.

Certain matters discussed herein may constitute forward-looking statements. The Private Securities Litigation Reform Act of 1995 provides safe harbor protections for forward-looking statements in order to encourage companies to provide prospective information about their business. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events or performance, and underlying assumptions and other statements, which are other than statements of historical facts.

The Company desires to take advantage of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and is including this cautionary statement in connection with this safe harbor legislation. This report and any other written or oral statements made by us or on our behalf may include forward-looking statements, which reflect our current views with respect to future events and financial performance, and are not intended to give any assurance as to future results. When used in this document, the words “believe,” “expect,” “anticipate,” “estimate,” “intend,” “plan,” “target,” “project,” “likely,” “may,” “could” and similar expressions, terms, or phrases may identify forward-looking statements.

The forward-looking statements are based upon various assumptions, many of which are based, in turn, upon further assumptions, including without limitation, our management's examination of historical operating trends, data contained in our records and other data available from third parties. Although we believe 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, we cannot assure you that we will achieve or accomplish these expectations, beliefs or projections. We undertake no obligation to update any forward-looking statement, whether as a result of new information, future events or otherwise.

In addition to these assumptions and matters discussed elsewhere herein and in the documents incorporated by reference herein, important factors that, in our view, could cause actual results to differ materially from those discussed in the forward-looking statements include the following:

Any forward-looking statements contained herein are made only as of the date of this prospectus, and we undertake no obligation to update any forward-looking statement or statements to reflect events or circumstances after the date on which such statement is made or to reflect the occurrence of unanticipated events. New factors emerge from time to time, and it is not possible for us to predict all or any of these factors. Further, we cannot assess the impact of each such factor on our business or the extent to which any factor, or combination of factors, may cause actual results to be materially different from those contained in any forward-looking statement.

We are a growth-oriented global shipping company engaged in the seaborne transportation of a wide range of dry bulk commodities including, among others, iron ore, coal and grain, collectively referred to as "major bulks," and steel products, fertilizers, cement, bauxite, sugar and scrap metal, collectively referred to as "minor bulks". We were incorporated in the Republic of the Marshall Islands on September 11, 2017.

On September 22, 2017, we entered into an all-share exchange transaction (the "Magic P Purchase Transaction") pursuant to which we acquired 100% of the issued and outstanding capital stock of our sole wholly-owned subsidiary Spetses Shipping Co. ("Spetses"), a Marshall Islands corporation, which owns a 76,453 dwt drybulk carrier, the Magic P, or our Vessel. The consideration for the Magic P Purchase transaction involved the issuance of 2,400,000 common shares, 480,000 9.75% Series A Cumulative Redeemable Perpetual Preferred Shares (the "Series A Preferred Shares") and 12,000 non-interest bearing Series B Preferred Shares (the "Series B Preferred Shares") to the then existing shareholders of Spetses.

Our Fleet is currently comprised of our Vessel. The following table summarizes key information about our Vessel as of the date of this prospectus:

The ship management of our Vessel is provided by Pavimar, a company controlled by Ismini Panagiotidis, the sister of our Chairman, Chief Executive Officer and Chief Financial Officer, Petros Panagiotidis. Under the management agreement, Pavimar provides us with a wide range of shipping services such as crew management, technical management, operational employment management, insurance arrangements, provisioning, bunkering, accounting services, general administration and audit support.  From December 16, 2017, onwards and for a period of two years thereof, the fixed daily management fee of our Vessel is $320, at which time the daily management fee may be revised.

An investment in our securities involves a high degree of risk.  You should carefully consider the risks set forth below and the discussion of risks under the heading “Item 3. Key Information—D. Risk Factors” in our Annual Report on Form 20-F for the year ended September 30, 2018, as amended, filed with the Commission on January 31, 2019, and the other documents which are incorporated by reference in this prospectus, before making an investment in our securities.  Please see the section of this prospectus entitled “Where You Can Find Additional Information—Information Incorporated by Reference.”  In addition, you should also consider carefully the risks set forth under the heading “Risk Factors” in any prospectus supplement before investing in the securities offered by this prospectus. The occurrence of one or more of those risk factors could adversely impact our business, financial condition or results of operations.

We may issue additional common shares or other equity securities of equal or senior rank in the future in connection with, among other things, future vessel acquisitions, repayment of future outstanding indebtedness or payment of dividends under our preferred class of shares, without shareholder approval, in a number of circumstances.

Our issuance of additional common shares or other equity securities of equal or senior rank would have the following effects:

On September 22, 2017, we entered into an exchange agreement, or the Exchange Agreement, with Spetses and its shareholders.  Under the terms of the Exchange Agreement, we issued 2,400,000 common shares, 480,000 Series A Preferred Shares and 12,000 Series B Preferred Shares of the Company in exchange for all of the issued and outstanding common shares of Spetses.

On November 21, 2017, we declared a dividend of one preferred share purchase right for each outstanding common share and adopted a shareholder rights plan, as set forth in a Stockholders Rights Agreement dated as of November 20, 2017, by and between us and American Stock Transfer & Trust Company, LLC, as rights agent. For more information, please see “—Stockholders Rights Agreement” herein. In connection with the Stockholders Rights Agreement, we designated 1,000,000 shares as Series C Participating Preferred Stock, none of which are outstanding as of the date of this prospectus.

On December 21, 2018, our common shares, par value $0.001, were registered for trading on the Norwegian OTC (the “NOTC”) with ticker symbol “CASTOR”.  On February 11, 2019, our common shares began trading on the NASDAQ Capital Market under the ticker symbol “CTRM”.

Unless we specify otherwise in any prospectus supplement, we may use the net proceeds from the sale of securities offered by this prospectus for capital expenditures, working capital, to make vessel or other asset acquisitions or for general corporate purposes or a combination thereof.

Each prospectus supplement will include information on the Company's consolidated capitalization.

We are incorporated under the laws of the Republic of the Marshall Islands, and substantially all of our assets are located outside of the United States. Our principal executive office is located in Cyprus. In addition, all of our directors and officers are non-residents of the United States, and substantially all of their assets are located outside the United States. As a result, it may be difficult or impossible for you to bring an action against us or against these individuals in the United States if you believe that your rights have been infringed under securities laws or otherwise. Even if you are successful in bringing an action of this kind, the laws of the Republic of the Marshall Islands and of other jurisdictions may prevent or restrict you from enforcing a judgment against our assets or our directors and officers. Although you may bring an original action against us or our affiliates in the courts of the Marshall Islands, and the courts of the Marshall Islands may impose civil liability, including monetary damages, against us or our affiliates for a cause of action arising under Marshall Islands law, it may be impracticable for you to do so.

We may sell or distribute the securities included in this prospectus through underwriters, through agents, to dealers, in private transactions, at market prices prevailing at the time of sale, at prices related to the prevailing market prices, or at negotiated prices.

In addition, we may sell some or all of the securities included in this prospectus through:

In addition, we may enter into options or other types of transactions that require us to deliver our securities to a broker-dealer, who will then resell or transfer the securities under this prospectus. We may enter into hedging transactions with respect to our securities. For example, we may:

We may enter into derivative transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions. If the applicable prospectus supplement indicates, in connection with those derivatives, the third parties may sell securities covered by this prospectus and the applicable prospectus supplement, including in short sale transactions. If so, the third party may use securities pledged by us or borrowed from us to settle those sales or to close out any related open borrowings of stock, and may use securities received from us in settlement of those derivatives to close out any related open borrowings of stock. The third party in such sale transactions will be an underwriter and, if not identified in this prospectus, will be identified in the applicable prospectus supplement (or a post-effective amendment). In addition, we may otherwise loan or pledge securities to a financial institution or other third party that in turn may sell the securities short using this prospectus. Such financial institution or other third party may transfer its economic short position to investors in our securities or in connection with a concurrent offering of other securities.

Any broker-dealers or other persons acting on our behalf that participate with us in the distribution of the securities, may be deemed to be underwriters, and any commissions received or profit realized by them on the resale of the securities, may be deemed to be underwriting discounts and commissions under the Securities Act of 1933, as amended, or the Securities Act.  As of the date of this prospectus, we are not a party to any agreement, arrangement or understanding between any broker or dealer and us with respect to the offer or sale of the securities pursuant to this prospectus.

At the time that any particular offering of securities is made, to the extent required by the Securities Act, a prospectus supplement will be distributed, setting forth the terms of the offering, including the aggregate number of securities being offered, the purchase price of the securities, the initial offering price of the securities, the names of any underwriters, dealers or agents, any discounts, commissions and other items constituting compensation from us and any discounts, commissions or concessions allowed or re-allowed or paid to dealers. Furthermore, we, our executive officers, our directors and major shareholders may agree, subject to certain exemptions, that for a certain period from the date of the prospectus supplement under which the securities are offered, we and they will not, without the prior written consent of an underwriter, offer, sell, contract to sell, pledge or otherwise dispose of any of our common shares or any securities convertible into or exchangeable for our common shares.  However, an underwriter, in its sole discretion, may release any of the securities subject to these lock-up agreements at any time without notice. We expect an underwriter to exclude from these lock-up agreements securities exercised and/or sold pursuant to trading plans entered into by us pursuant to Rule 10b5-1 under the Exchange Act, that are in place at the time of an offering pursuant to this prospectus and any applicable prospectus supplement hereto that provide for periodic sales of our securities on the basis of parameters described in such trading plans.

Underwriters or agents could make sales in privately negotiated transactions and/or any other method permitted by law, including sales deemed to be an at-the-market offering as defined in Rule 415 promulgated under the Securities Act, which includes sales made directly on or through the NASDAQ, the existing trading market for our common shares, or sales made to or through a market maker other than on an exchange.

We will bear costs relating to the securities offered and sold under this Registration Statement.

If more than five percent (5%) of the net proceeds of any offering of common shares made under this prospectus will be received by a Financial Industry Regulatory Authority, or FINRA, member participating in the offering or affiliates or associated persons of such a FINRA member, the offering will be conducted in accordance with FINRA Rule 5121.

Under our articles of incorporation, our authorized capital stock consists of 1,950,000,000 common shares, par value $0.001 per share, of which 2,400,000 common shares are issued and outstanding and 50,000,000 preferred shares, par value $0.001 per share, of which 480,000 Series A Preferred Shares and 12,000 Series B Preferred Shares are issued and outstanding.

On September 22, 2017, we entered into an exchange agreement, or the Exchange Agreement, with Spetses and its shareholders.  Under the terms of the Exchange Agreement, we issued 2,400,000 common shares 480,000 Series A Preferred Shares and 12,000 Series B Preferred Shares of the Company in exchange for all of the issued and outstanding common shares of Spetses.

On November 21, 2017, we declared a dividend of one preferred share purchase right for each outstanding common share and adopted a shareholder rights plan, as set forth in a Stockholders Rights Agreement dated as of November 20, 2017, by and between us and American Stock Transfer & Trust Company, LLC, as rights agent. For more information, please see “—Stockholders Rights Agreement” herein. In connection with the Stockholders Rights Agreement, we designated 1,000,000 shares as Series C Participating Preferred Stock, none of which are outstanding as of the date of this prospectus.

Each outstanding common share entitles the holder to one vote on all matters submitted to a vote of shareholders. Subject to preferences that may be applicable to any outstanding preferred shares, holders of common shares are entitled to receive ratably all dividends, if any, declared by our Board out of funds legally available for dividends. Upon our dissolution or liquidation or the sale of all or substantially all of our assets, after payment in full of all amounts required to be paid to creditors and to the holders of preferred stock having liquidation preferences, if any, the holders of our common shares are entitled to receive pro rata our remaining assets available for distribution. Holders of common shares do not have conversion, redemption or pre-emptive rights to subscribe to any of our securities. The rights, preferences and privileges of holders of our common shares are subject to the rights of the holders of any preferred shares, which we have issued in the past or which we may issue in the future.

Our articles of incorporation authorize our Board to establish one or more series of preferred shares and to determine, with respect to any series of preferred shares, the terms and rights of that series, including:

On September 22, 2017, we issued 480,000 Series A Preferred Shares to the shareholders of Spetses, under the Exchange Agreement.

The Series A Preferred Shares entitle the holders thereof to receive cumulative cash dividends when, as and if declared by our Board out of legally available funds for such purpose.  Each Series A Preferred Share has a fixed liquidation preference of $25.00 per share plus an amount equal to accumulated and unpaid dividends thereon to the date fixed for payment, whether or not declared. See “—Liquidation Rights.”

The Series A Preferred Shares represent perpetual equity interests in us and, unlike indebtedness, will not give rise to a claim for payment of a principal amount at a particular date.   As such, the Series A Preferred Shares will rank junior to any future indebtedness and other liabilities with respect to assets available to satisfy claims against us.

The Series A Preferred Shares rank, with respect to dividend distributions and distributions upon the liquidation, winding-up and dissolution of our affairs, senior to our common shares, our Series B Preferred Shares and to each other class or series of capital stock established after the original issue date of the Series A Preferred Shares as to the payment of dividends and amounts payable upon liquidation, dissolution or winding up, whether voluntary or involuntary (“Junior Stock”).

We may issue additional common shares, additional Series A Preferred Shares and Junior Stock.  Except as described in the Series A Preferred Shares Statement of Designation, the Board has the authority to determine the preferences, powers, qualifications, limitations, restrictions and special or relative rights or privileges, if any, of any such series of Junior Stock before the issuance of any shares of that series.  The Board shall also determine the number of shares constitution each series of securities.

Holders of the Series A Preferred Shares will be entitled to receive, when, as and if declared by our Board out of legally available funds for such purpose, cumulative cash dividends from September 22, 2017.

Dividends on Series A Preferred Shares are cumulative, commencing on September 22, 2017, and payable on each Dividend Payment Date, commencing December 15, 2017, when, as and if declared by our Board or any authorized committee thereof out of legally available funds for such purpose. Dividends on the Series A Preferred Shares accrue at a rate of 9.75% per annum per Series A Preferred Share.

In the event that any semi-annual dividend payable on the Series A Preferred Shares is in arrears, the Dividend Rate payable on the Series A Preferred Shares increases to a rate that is 1.30 times the Dividend Rate payable on the Series A Preferred Shares as of the close of business on the day immediately preceding the Dividend Payment Date, and in any subsequent Dividend Payment Date the Dividend Rate payable shall increase to a rate that is 1.30 times the Dividend Rate payable on the Series A Preferred Shares as in effect as of the close of business on the day immediately preceding such Dividend Payment Date until Dividend Payment Default is cured.

The “Dividend Payment Dates” for the Series A Preferred Shares is June 15 and December 15, commencing December 15, 2017. Dividends will accumulate in each dividend period from and including the preceding Dividend Payment Date or the initial issue date, as the case may be, to but excluding the applicable Dividend Payment Date for such dividend period. If any Dividend Payment Date otherwise would fall on a day that is not a Business Day, declared dividends will be paid on the immediately succeeding Business Day without the accumulation of additional dividends. Dividends on the Series A Preferred Shares will be payable based on a 360-day year consisting of twelve 30-day months.

“Business Day” means a day on which NASDAQ is open for trading and which is not a Saturday, a Sunday or other day on which banks in New York City are authorized or required by law to close.

Not later than the close of business, New York City time, on each Dividend Payment Date, we will pay those dividends, if any, on the Series A Preferred Shares that have been declared by our Board to the holders of such shares as such holders’ names appear on our stock transfer books maintained by the Registrar and Transfer Agent on the applicable Record Date. The applicable record date (the “Record Date”), will be the Business Day immediately preceding the applicable Dividend Payment Date, except that in the case of payments of dividends in arrears, the Record Date with respect to a Dividend Payment Date will be such date as may be designated by our Board in accordance with our Bylaws then in effect and the Statement of Designation.

No dividend may be declared or paid or set apart for payment on any Junior Stock (other than a dividend payable solely in shares of Junior Stock) unless full cumulative dividends have been or contemporaneously are being paid or provided for on all outstanding Series A Preferred Shares for all prior and the then-ending dividend periods. In addition, in the event that full cumulative dividends on the Series A Preferred Shares have not been paid or declared and set apart for payment, we may not repurchase, redeem or otherwise acquire, in whole or in part, any Series A Preferred Shares except pursuant to a purchase or exchange offer made on the same terms to all holders of Series A Preferred Shares. Common stock and any other Junior Stock may not be redeemed, repurchased or otherwise acquired unless full cumulative dividends on the Series A Preferred Shares for all prior and the then-ending dividend periods have been paid or declared and set apart for payment.

Accumulated dividends in arrears for any past dividend period may be declared by our Board and paid on any date fixed by our Board, whether or not a Dividend Payment Date, to holders of the Series A Preferred Shares on the record date for such payment, which may not be more than 60 days, nor less than 5 days, before such payment date. Subject to the next succeeding sentence, if all accumulated dividends in arrears on all outstanding Series A Preferred Shares have not been declared and paid, or sufficient funds for the payment thereof have not been set apart, payment of accumulated dividends in arrears will be made in order of their respective Dividend Payment Dates, commencing with the earliest. If less than all dividends payable with respect to all Series A Preferred Shares are paid, any partial payment will be made pro rata with respect to the Series A Preferred Shares entitled to a dividend payment at such time in proportion to the aggregate amounts remaining due in respect of such shares at such time. Holders of the Series A Preferred Shares will not be entitled to any dividend, whether payable in cash, property or stock, in excess of full cumulative dividends. No interest or sum of money in lieu of interest will be payable in respect of any dividend payment which may be in arrears on the Series A Preferred Shares.

The holders of outstanding Series A Preferred Shares will be entitled, in the event of any liquidation, dissolution or winding up of our affairs, whether voluntary or involuntary, to receive the liquidation preference of $25.00 per share in cash plus an amount equal to accumulated and unpaid dividends thereon to the date fixed for payment of such amount (whether or not declared), and no more, before any distribution will be made to the holders of our common stock or any other Junior Stock. A consolidation or merger of us with or into any other entity, individually or in a series of transactions, will not be deemed a liquidation, dissolution or winding up of our affairs for this purpose. In the event that our assets available for distribution to holders of the outstanding Series A Preferred Shares are insufficient to permit payment of all required amounts, our assets then remaining will be distributed among the Series A Preferred Shares, as applicable, ratably on the basis of their relative aggregate liquidation preferences. After payment of all required amounts to the holders of the outstanding Series A Preferred Shares, our remaining assets and funds will be distributed among the holders of the common stock and any other Junior Stock then outstanding according to their respective rights.

The Series A Preferred Shares have no voting rights except as provided by Marshall Islands law.  Unless the Company shall have received the affirmative vote or consents of the Holders of at least two thirds of the outstanding Series A Preferred Shares, voting as a single class, the Company may not adopt any amendment to the Articles of Incorporation that adversely alters the preferences, powers or rights of the Series A Preferred Shares.

We have the right at any time on or after March 22, 2018 to redeem the Series A Preferred Shares, in whole or from time to time in part, from any funds available for such purpose. Any such redemption shall occur on a date set by the Company, or the Redemption Date.

(a) Redemption Price. The Company may redeem each share of Series A Preferred Shares at an amount equal to $25.00 per Series A Preferred Share in cash plus an amount equal to accumulated and unpaid dividends as of the Redemption Date, whether or not declared, or the Redemption Price.  The Redemption Price may be paid in cash, common shares or a note as shall be determined in the Company’s sole discretion.  If paid in common shares, the price of the common shares will be 90% of the lowest daily volume weighted average price on any trading day during the 5 consecutive trading day period ending and including the trading day immediately prior to the date of the applicable Redemption Date.

Notwithstanding any other provisions herein, the holder of Series A Preferred Shares shall not acquire, or be obligated or have the right to acquire, any common share pursuant to an optional redemption which, when aggregated with all other common shares then beneficially owned (as calculated pursuant to Section 13(d) of the Exchange Act and Rule 13d-3 promulgated thereunder) by the Holder and its Affiliates, would result in the beneficial ownership by the holder of Series A Preferred Shares of more than 4.9% of the then issued and outstanding common shares, or the Ownership Limitation.  If the Company issues a Redemption Notice that would cause the aggregate number of common shares then beneficially owned (as calculated pursuant to Section 13(d) of the Exchange Act and Rule 13d-3 promulgated thereunder) by the holder of Series A Preferred Shares and its affiliates to exceed the Ownership Limitation, such Redemption Notice shall be void ab initio to the extent of the amount by which the number of common shares otherwise issuable pursuant to such Redemption Notice, together with all common shares then beneficially owned (as calculated pursuant to Section 13(d) of the Exchange Act and Rule 13d-3 promulgated thereunder) by the holder of Series A Preferred Shares and its affiliates, would exceed the Ownership Limitation.  Upon the written or oral request of the holder of Series A Preferred Shares, the Company shall promptly confirm orally or in writing to the holder of Series A Preferred Shares the number of common shares then outstanding. The holder of Series A Preferred Shares and the Company shall each cooperate in good faith in the determinations required hereby and the application hereof.  The holder’s of Series A Preferred Shares written certification to the Company of the applicability of the Ownership Limitation, and the resulting effect thereof hereunder at any time, shall be conclusive with respect to the applicability thereof and such result absent manifest error. Upon delivery of a written notice to the Company, the holder of Series A Preferred Shares may from time to time increase (with such increase not effective until the sixty-first (61st) day after delivery of such notice) or decrease the Ownership Limitation to any other amount of common shares not in excess of 9.99% of the then issued and outstanding shares of common shares as specified in such notice; provided that any such increase in the Ownership Limitation will not be effective until the sixty-first (61st) day after such written notice is delivered to the Company.

(b) Redemption Notice. The Company shall give notice of any redemption by mail not less than 30 days and not more than 60 days before the scheduled Redemption Date, to the holder of Series A Preferred Shares of record (as of 4:59 p.m. New York City time on the Business Day next preceding the day on which notice is given) of any Series A Preferred Shares to be redeemed as such holders’ names appear on the Company’s stock transfer books maintained by the Registrar and Transfer Agent and at the address of such holders shown therein. Such notice, or the Redemption Notice shall state: (1) the Redemption Date, (2) the number of Series A Preferred Shares to be redeemed and, if less than all outstanding Series A Preferred Shares are to be redeemed, the number (and the identification) of shares to be redeemed from such Holder, (3) the Redemption Price, (4) the place where the Series A Preferred Shares is to be redeemed and shall be presented and surrendered for payment of the Redemption Price therefor and (5) that dividends on the stock to be redeemed shall cease to accumulate from and after such Redemption Date.

(c)   Effect of Redemption; Partial Redemption. If the Company elects to redeem less than all of the outstanding Series A Preferred Shares, the number of shares to be redeemed shall be determined by the Company, and such shares shall be redeemed pro rata or by lot, with adjustments to avoid redemption of fractional shares.  The Company shall give notice, or cause notice to be given, to the holders of the number of shares of Series A Preferred Shares to be redeemed, and the Company shall determine the number of Series A Preferred Shares to be redeemed from the account of each of its participants holding such shares in its participant account. The aggregate Redemption Price for any such partial redemption of the outstanding Series A Preferred Shares shall be allocated correspondingly among the redeemed Series A Preferred Shares. The Series A Preferred Shares not redeemed shall remain outstanding and subject to all the terms provided in this Statement of Designation.

(d) Redemption Funds. If the Company gives or causes to be given a Redemption Notice, the Company shall deposit with the paying agent funds sufficient to redeem the Series A Preferred Shares as to which such Redemption Notice shall have been given, no later than 4:59 p.m. New York City time on the Business Day immediately preceding the Redemption Date, and shall give the paying agent irrevocable instructions and authority to pay the Redemption Price to the holders of the Series A Preferred Shares to be redeemed upon surrender or deemed surrender of the certificates therefor. If the Redemption Notice shall have been given, from and after the Redemption Date, unless the Company defaults in providing funds sufficient for such redemption at the time and place specified for payment pursuant to the Redemption Notice, all dividends on such Series A Preferred Shares to be redeemed shall cease to accumulate and all rights of Holders of such shares as the Company’s shareholders shall cease, except the right to receive the Redemption Price, and such shares shall not thereafter be transferred on Company’s stock transfer books or be deemed to be outstanding for any purpose whatsoever. The Company shall be entitled to receive from the paying agent the interest income, if any, earned on such funds deposited with the paying agent (to the extent that such interest income is not required to pay the Redemption Price of the Series A Preferred Shares to be redeemed), and the holders of any shares so redeemed shall have no claim to any such interest income. Any funds deposited with the paying agent hereunder by the Company for any reason, including, but not limited to, redemption of Series A Preferred Shares, that remain unclaimed or unpaid after two years after the applicable Redemption Date or other payment date, shall be, to the extent permitted by law, repaid to the Company upon its written request after which repayment the holders of the Series A Preferred Shares entitled to such redemption or other payment shall have recourse only to the Company. Notwithstanding any Redemption Notice, there shall be no redemption of any Series A Preferred Shares called for redemption until funds sufficient to pay the full Redemption Price of such shares shall have been deposited by the Company with the paying agent.

(e) Certificate. If only a portion of the Series A Preferred Shares represented by a certificate shall have been called for redemption, upon surrender of the certificate to the Paying Agent, the Paying Agent shall issue to the Holder of such shares a new certificate (or adjust the applicable book-entry account) representing the number of shares of Series A Preferred Shares represented by the surrendered certificate that have not been called for redemption.

On September 22, 2017, we issued 12,000 Series B Preferred Shares to Thalassa, a company wholly owned and controlled by our Chairman, Chief Executive Officer and Chief Financial Officer, Petros Panagiotidis, under the Exchange Agreement. Each Series B Preferred Share has the voting power of one hundred thousand (100,000) common shares.

The Series B Preferred Stock has the following characteristics:

Conversion. The Series B Preferred Shares are not convertible into common shares.

Voting. Each Series B Preferred Share has the voting power of 100,000 common shares and shall count for 100,000 votes for purposes of determining quorum at a meeting of shareholders.

Distributions. The Series B Preferred Shares shall have no dividend or distribution rights.

Liquidation, Dissolution or Winding Up. Upon any liquidation, dissolution or winding up of the Company, the Series B Preferred Shares shall have the same liquidation rights as the common shares.

On November 21, 2017, our Board declared a dividend of one preferred share purchase right, or a Right, for each outstanding common share and adopted a shareholder rights plan, as set forth in the Stockholders Rights Agreement dated as of November 20, 2017, or the Rights Agreement, by and between the Company and American Stock Transfer & Trust Company, LLC, as rights agent.

The Board adopted the Rights Agreement to protect shareholders from coercive or otherwise unfair takeover tactics. In general terms, it works by imposing a significant penalty upon any person or group that acquires 15% or more of our outstanding common shares without the approval of our Board. If a shareholder’s beneficial ownership of our common shares as of the time of the public announcement of the rights plan and associated dividend declaration is at or above the applicable threshold, that shareholder’s then-existing ownership percentage would be grandfathered, but the rights would become exercisable if at any time after such announcement, the shareholder increases its ownership percentage by 1% or more.  Our Chairman, Chief Executive Officer and Chief Financial Officer, Petros Panagiotidis, is exempt from these provisions.

The Rights may have anti-takeover effects. The Rights will cause substantial dilution to any person or group that attempts to acquire us without the approval of our Board. As a result, the overall effect of the Rights may be to render more difficult or discourage any attempt to acquire us. Because our Board can approve a redemption of the Rights for a permitted offer, the Rights should not interfere with a merger or other business combination approved by our Board.

For those interested in the specific terms of the Rights Agreement, we provide the following summary description. Please note, however, that this description is only a summary, and is not complete, and should be read together with the entire Rights Agreement, which is an exhibit to this annual report.  The foregoing description of the Rights Agreement is qualified in its entirety by reference to such exhibit.

The Rights. The Rights trade with, and are inseparable from, our common shares. The Rights are evidenced only by certificates that represent our common shares. New Rights will accompany any new common shares of the Company issued after November 21, 2017 until the Distribution Date described below.

Exercise Price. Each Right allows its holder to purchase from the Company one one-thousandth of a share of Series C Participating Preferred Stock, or a Series C Preferred Share, for $15.00, or the Exercise Price, once the Rights become exercisable. This portion of a Series C Preferred Share will give the shareholder approximately the same dividend, voting and liquidation rights as would one common share. Prior to exercise, the Right does not give its holder any dividend, voting, or liquidation rights.

Exercisability. The Rights are not exercisable until ten days after the public announcement that a person or group has become an “Acquiring Person” by obtaining beneficial ownership of 15% or more of our outstanding common shares.  Except our Chairman, Chief Executive Officer and Chief Financial Officer, Petros Panagiotidis, is exempt from being the “Acquiring Person”.

Certain synthetic interests in securities created by derivative positions — whether or not such interests are considered to be ownership of the underlying common shares or are reportable for purposes of Regulation 13D of the Securities Exchange Act of 1934, as amended— are treated as beneficial ownership of the number of our common shares equivalent to the economic exposure created by the derivative position, to the extent our actual common shares are directly or indirectly held by counterparties to the derivatives contracts. Swaps dealers unassociated with any control intent or intent to evade the purposes of the Rights Agreement are excepted from such imputed beneficial ownership.

For persons who, prior to the time of public announcement of the Rights Agreement, beneficially own 15% or more of our outstanding common shares, the Rights Agreement “grandfathers” their current level of ownership, so long as they do not purchase additional shares in excess of certain limitations.

The date when the Rights become exercisable is the “Distribution Date.” Until that date, our common share certificates (or, in the case of uncertificated shares, by notations in the book-entry account system) will also evidence the Rights, and any transfer of our common shares will constitute a transfer of Rights. After that date, the Rights will separate from our common shares and will be evidenced by book-entry credits or by Rights certificates that the Company will mail to all eligible holders of our common shares. Any Rights held by an Acquiring Person are null and void and may not be exercised.

Each one one-thousandth of a Series C Preferred Share, if issued, will, among other things:

The value of one one-thousandth interest in a Series C Preferred Share should approximate the value of one common share.

Flip In.  If an Acquiring Person obtains beneficial ownership of 15% or more of our common shares, then each Right will entitle the holder thereof to purchase, for the Exercise Price, a number of our common shares (or, in certain circumstances, cash, property or other securities of the Company) having a then-current market value of twice the Exercise Price. However, the Rights are not exercisable following the occurrence of the foregoing event until such time as the Rights are no longer redeemable by the Company, as further described below.

Following the occurrence of an event set forth in preceding paragraph, all Rights that are or, under certain circumstances specified in the Rights Agreement, were beneficially owned by an Acquiring Person or certain of its transferees will be null and void.

Flip Over. If, after an Acquiring Person obtains 15% or more of our common shares, (i) the Company merges into another entity; (ii) an acquiring entity merges into the Company; or (iii) the Company sells or transfers 50% or more of its assets, cash flow or earning power, then each Right (except for Rights that have previously been voided as set forth above) will entitle the holder thereof to purchase, for the Exercise Price, a number of our common shares of the person engaging in the transaction having a then-current market value of twice the Exercise Price.

Notional Shares. Shares held by affiliates and associates of an Acquiring Person, including certain entities in which the Acquiring Person beneficially owns a majority of the equity securities, and Notional Common Shares (as defined in the Rights Agreement) held by counterparties to a Derivatives Contract (as defined in the Rights Agreement) with an Acquiring Person, will be deemed to be beneficially owned by the Acquiring Person.

Redemption. The Board may redeem the Rights for $0.01 per Right at any time before any person or group becomes an Acquiring Person. If the Board redeems any Rights, it must redeem all of the Rights. Once the Rights are redeemed, the only right of the holders of the Rights will be to receive the redemption price of $0.01 per Right. The redemption price will be adjusted if the Company has a stock dividend or a stock split.

Exchange. After a person or group becomes an Acquiring Person, but before an Acquiring Person owns 50% or more of our outstanding common shares, the Board may extinguish the Rights by exchanging one common share or an equivalent security for each Right, other than Rights held by the Acquiring Person. In certain circumstances, the Company may elect to exchange the Rights for cash or other securities of the Company having a value approximately equal to one common share.

Expiration. The Rights expire on the earliest of (i) November 21, 2027; or (ii) the redemption or exchange of the Rights as described above.

Anti-Dilution Provisions. The Board may adjust the purchase price of the Series C Preferred Shares, the number of Series C Preferred Shares issuable and the number of outstanding Rights to prevent dilution that may occur from a stock dividend, a stock split, or a reclassification of the Series C Preferred Shares or our common shares. No adjustments to the Exercise Price of less than 1% will be made.

Amendments. The terms of the Rights and the Rights Agreement may be amended in any respect without the consent of the holders of the Rights on or prior to the Distribution Date. Thereafter, the terms of the Rights and the Rights Agreement may be amended without the consent of the holders of Rights, with certain exceptions, in order to (i) cure any ambiguities; (ii) correct or supplement any provision contained in the Rights Agreement that may be defective or inconsistent with any other provision therein; (iii) shorten or lengthen any time period pursuant to the Rights Agreement; or (iv) make changes that do not adversely affect the interests of holders of the Rights (other than an Acquiring Person or an affiliate or associate of an Acquiring Person).

Taxes. The distribution of Rights should not be taxable for federal income tax purposes. However, following an event that renders the Rights exercisable or upon redemption of the Rights, shareholders may recognize taxable income.

Our common shares are listed on the NASDAQ Capital Market and the NOTC under the ticker symbols “CTRM” and “CASTOR”, respectively.

The registrar and transfer agent for our common shares is American Stock Transfer & Trust Company.

We may offer and issue debt securities from time to time in one or more series, under one or more indentures, each dated as of a date on or prior to the issuance of the debt securities to which it relates, and pursuant to an applicable prospectus supplement.  We may issue senior debt securities and subordinated debt securities pursuant to separate indentures, a senior indenture and a subordinated indenture, respectively, in each case between us and the trustee named in the indenture.  We have filed forms of these documents as exhibits to the registration statement, of which this prospectus forms a part.  The senior indenture and the subordinated indenture, as amended or supplemented from time to time, are sometimes referred to individually as an “indenture” and collectively as the “indentures.” Each indenture will be subject to and governed by the Trust Indenture Act and will be construed in accordance with and governed by the laws of the State of New York, without giving effect to any principles thereof relating to conflicts of law that would result in the application of the laws of any other jurisdiction, unless otherwise stated in the applicable prospectus supplement and indenture (or post-effective amendment hereto).  The aggregate principal amount of debt securities which may be issued under each indenture will contain the specific terms of any series of debt securities or provide that those terms must be set forth in or determined pursuant to, an authorizing resolution, as defined in the applicable prospectus supplement, and/or a supplemental indenture, if any, relating to such series.  Our debt securities may be convertible or exchangeable into any of our equity or other debt securities.

The following description sets forth certain general terms and provisions of the debt securities. The particular terms and provisions of the debt securities offered by any prospectus supplement, and the extent to which the general terms and provisions described below may apply to the offered debt securities, will be described in the applicable subsequent filings.  We refer to any applicable prospectus supplement, amendment to the registration statement of which this prospectus forms a part, and reports we file with the Commission under the Exchange Act as “subsequent filings.”  The statements below are not complete and are subject to, and are qualified in their entirety by reference to, all of the provisions of the applicable indenture. The specific terms of any debt securities that we may offer, including any modifications of, or additions to, the general terms described below as well as any applicable material U.S. federal income tax considerations concerning the ownership of such debt securities will be described in the applicable prospectus supplement and indenture and, as applicable, supplemental indenture. Accordingly, for a complete description of the terms of a particular issue of debt securities, the general description of the debt securities set forth below should be read in conjunction with the applicable prospectus supplement and indenture, as amended or supplemented from time to time.

We expect that neither indenture will limit the amount of debt securities which may be issued.  The debt securities may be issued in one or more series.

You should read the applicable indenture and subsequent filings relating to the particular series of debt securities for the following terms of the offered debt securities:

Subsequent filings may include additional terms not listed above.  Unless otherwise indicated in subsequent filings with the Commission relating to the indenture, principal, premium and interest will be payable and the debt securities will be transferable at the corporate trust office of the applicable trustee.  Unless other arrangements are made or set forth in subsequent filings or a supplemental indenture, principal, premium and interest will be paid by checks mailed to the registered holders at their registered addresses.

Unless otherwise indicated in subsequent filings with the Commission, the debt securities will be issued only in fully registered form without coupons, in denominations of $1,000 or any integral multiple thereof.  No service charge will be made for any transfer or exchange of the debt securities, but we may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection with these debt securities.

Some or all of the debt securities may be issued as discounted debt securities, bearing no interest or interest at a rate which at the time of issuance is below market rates, to be sold at a substantial discount below the stated principal amount.  United States federal income tax consequences and other special considerations applicable to any discounted securities will be described in subsequent filings with the Commission relating to those securities.

We may issue senior debt securities, which may be secured or unsecured, under the senior debt indenture. The senior debt securities will rank on an equal basis with all our other senior debt except subordinated debt.  The senior debt securities will be effectively subordinated, however, to all of our secured debt to the extent of the value of the collateral securing such debt. We will disclose the amount of our debt in the prospectus supplement.

We may issue subordinated debt securities under a subordinated debt indenture.  Subordinated debt would rank subordinate and junior in right of payment, to the extent set forth in the subordinated debt indenture, to all our senior debt.

Any series of debt securities may have covenants in addition to or differing from those included in the applicable indenture which will be described in subsequent filings prepared in connection with the offering of such securities, limiting or restricting, among other things:

We expect that each indenture and the rights of the respective holders may be modified by us only with the consent of holders of not less than a majority in aggregate principal amount of the outstanding debt securities of all series under the respective indenture affected by the modification, taken together as a class.  But we expect that no modification that:

will be effective against any holder without his consent.  Other terms as specified in subsequent filings may be modified without the consent of the holders.

We expect that each indenture will define an event of default for the debt securities of any series as being any one of the following events:

An event of default of one series of debt securities will not necessarily constitute an event of default with respect to any other series of debt securities.

There may be such other or different events of default as described in an applicable subsequent filing with respect to any class or series of debt securities.

We expect that under each indenture, in case an event of default occurs and continues for the debt securities of any series, the applicable trustee or the holders of not less than 25% in aggregate principal amount of the debt securities then outstanding of that series may declare the principal and accrued but unpaid interest of the debt securities of that series to be due and payable.  Further, any event of default for the debt securities of any series which has been cured is expected to be permitted to be waived by the holders of a majority in aggregate principal amount of the debt securities of that series then outstanding.

We expect that each indenture will require us to file annually after debt securities are issued under that indenture with the applicable trustee a written statement signed by two of our officers as to the absence of material defaults under the terms of that indenture.  We also expect that each indenture will provide that the applicable trustee may withhold notice to the holders of any default if it considers it in the interest of the holders to do so, except notice of a default in payment of principal, premium or interest.

Subject to the duties of the trustee in case an event of default occurs and continues, we expect that each indenture will provide that the trustee is under no obligation to exercise any of its rights or powers under that indenture at the request, order or direction of holders unless the holders have offered to the trustee reasonable indemnity.  Subject to these provisions for indemnification and the rights of the trustee, each indenture is expected to provide that the holders of a majority in principal amount of the debt securities of any series then outstanding have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee or exercising any trust or power conferred on the trustee as long as the exercise of that right does not conflict with any law or the indenture.

The terms of each indenture are expected to provide us with the option to be discharged from any and all obligations in respect of the debt securities issued thereunder upon the deposit with the trustee, in trust, of money or U.S. government obligations, or both, which through the payment of interest and principal in accordance with their terms will provide money in an amount sufficient to pay any installment of principal, premium and interest on, and any mandatory sinking fund payments in respect of, the debt securities on the stated maturity of the payments in accordance with the terms of the debt securities and the indenture governing the debt securities.  We expect that this right may only be exercised if, among other things, we have received from, or there has been published by, the United States Internal Revenue Service a ruling to the effect that such a discharge will not be deemed, or result in, a taxable event with respect to holders.  This discharge would not apply to our obligations to register the transfer or exchange of debt securities, to replace stolen, lost or mutilated debt securities, to maintain paying agencies and hold moneys for payment in trust.

We expect that the terms of the debt securities provide us with the right not to comply with specified covenants and that specified events of default described in a subsequent filing will not apply provided we deposit with the trustee money or U.S. government obligations, or both, which through the payment of interest and principal will provide money in an amount sufficient to pay any installment of principal, premium, and interest on, and any mandatory sinking fund payments in respect of, the debt securities on the stated maturity of such payments in accordance with the terms of the debt securities and the indenture governing such debt securities. We expect that to exercise this right, we will also be required to deliver to the trustee an opinion of counsel to the effect that the deposit and related covenant defeasance should not cause the holders of such series to recognize income, gain or loss for federal income tax purposes.

We refer you to applicable subsequent filings with respect to any deletions or additions or modifications from the description contained in this prospectus.

Each debt security will be represented either by a certificate issued in definitive form to a particular investor or by one or more global securities representing the entire issuance of securities. Both certificated securities in definitive form and global securities may be issued either in registered form, where our obligation runs to the holder of the security named on the face of the security, or in bearer form, where our obligation runs to the bearer of the security.

Definitive securities name you or your nominee as the owner of the security, other than definitive bearer securities, which name the bearer as owner, and in order to transfer or exchange these securities or to receive payments other than interest or other interim payments, you or your nominee must physically deliver the securities to the trustee, registrar, paying agent or other agent, as applicable.

Global securities name a depositary or its nominee as the owner of the debt securities represented by these global securities, other than global bearer securities, which name the bearer as owner. The depositary maintains a computerized system that will reflect each investor’s beneficial ownership of the securities through an account maintained by the investor with its broker/dealer, bank, trust company or other representative, as we explain more fully below.

We may issue the debt securities in the form of one or more fully registered global securities that will be deposited with a depositary or its nominee identified in the applicable prospectus supplement and registered in the name of that depositary or nominee. In those cases, one or more registered global securities will be issued in a denomination or aggregate denominations equal to the portion of the aggregate principal or face amount of the securities to be represented by registered global securities. Unless and until it is exchanged in whole for securities in definitive registered form, a registered global security may not be transferred except as a whole by and among the depositary for the registered global security, the nominees of the depositary or any successors of the depositary or those nominees. If not described below, any specific terms of the depositary arrangement with respect to any debt securities to be represented by a registered global security will be described in the prospectus supplement relating to those debt securities. We anticipate that the following provisions will apply to all depositary arrangements:

Ownership of beneficial interests in a registered global security will be limited to persons, called participants, that have accounts with the depositary or persons that may hold interests through participants. Upon the issuance of a registered global security, the depositary will credit, on its book-entry registration and transfer system, the participants’ accounts with the respective principal or face amounts of the securities beneficially owned by the participants. Any dealers, underwriters or selling agents participating in the distribution of the securities will designate the accounts to be credited. Ownership of beneficial interests in a registered global security will be shown on, and the transfer of ownership interests will be effected only through, records maintained by the depositary, with respect to interests of participants, and on the records of participants, with respect to interests of persons holding through participants. The laws of some jurisdictions may require that some purchasers of securities take physical delivery of these securities in definitive form. These laws may impair your ability to own, transfer or pledge beneficial interests in registered global securities. So long as the depositary, or its nominee, is the registered owner of a registered global security, that depositary or its nominee, as the case may be, will be considered the sole owner or holder of the securities represented by the registered global security for all purposes under the indenture.

Except as described below, owners of beneficial interests in a registered global security will not be entitled to have the securities represented by the registered global security registered in their names, will not receive or be entitled to receive physical delivery of the securities in definitive form and will not be considered the owners or holders of the securities under the indenture. Accordingly, each person owning a beneficial interest in a registered global security must rely on the procedures of the depositary for that registered global security and, if that person is not a participant, on the procedures of the participant through which the person owns its interest in that registered global security, to exercise any rights of a holder under the indenture. We understand that under existing industry practices, if we request any action of holders of a registered global security or if an owner of a beneficial interest in a registered global security desires to give or take any action that a holder is entitled to give or take under the indenture, the depositary for the registered global security would authorize the participants holding the relevant beneficial interests to give or take that action, and the participants would authorize beneficial owners owning through them to give or take that action or would otherwise act upon the instructions of beneficial owners holding through them.

Principal, premium, if any, and interest payments on debt securities represented by a registered global security registered in the name of a depositary or its nominee will be made to the depositary or its nominee, as the case may be, as the registered owner of the registered global security. None of us, the trustee or any other agent of us or agent of the trustee will have any responsibility or liability to owners of beneficial interests for any aspect of the records relating to payments made on account of beneficial ownership interests in the registered global security or for maintaining, supervising or reviewing any records relating to those beneficial ownership interests. We expect that the depositary for any of the securities represented by a registered global security, upon receipt of any payment of principal, premium, interest or other distribution of underlying securities or other property to holders on that registered global security, will immediately credit participants’ accounts in amounts proportionate to their respective beneficial interests in that registered global security as shown on the records of the depositary. We also expect that payments by participants to owners of beneficial interests in a registered global security held through participants will be governed by standing customer instructions and customary practices, as is now the case with the securities held for the accounts of customers in bearer form or registered in “street name,” and will be the responsibility of those participants.

We expect that the indenture will provide that if the depositary for any of these securities represented by a registered global security is at any time unwilling or unable to continue as depositary or ceases to be a clearing agency registered under the Exchange Act, and a successor depositary registered as a clearing agency under the Exchange Act is not appointed by us within 90 days, we will be required to issue securities in definitive form in exchange for the registered global security that had been held by the depositary. In addition, the indenture is expected to allow us to decide, at any time and in our sole discretion, to not have any of the securities represented by one or more registered global securities. If we make that decision, we will issue securities in definitive form in exchange for all of the registered global security or securities representing those securities. Any securities issued in definitive form in exchange for a registered global security will be registered in the name or names that the depositary gives to the relevant trustee or other relevant agent of ours or theirs. It is expected that the depositary’s instructions will be based upon directions received by the depositary from participants with respect to ownership of beneficial interests in the registered global security that had been held by the depositary.

In the event that the Depository Trust Company, or DTC, acts as depository for the global securities of any series, the global securities will be issued as fully registered securities registered in the name of Cede & Co., as DTC's nominee.

We may issue warrants to purchase any of our debt or equity securities. Warrants may be issued independently or together with any other securities and may be attached to, or separate from, such securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between us and a warrant agent. The terms of any warrants to be issued and a description of the material provisions of the applicable warrant agreement will be set forth in the applicable prospectus supplement. We expect that such terms will include, among others:

We may issue purchase contracts for the purchase or sale of any of our debt or equity securities issued by us.

Each purchase contract will entitle the holder thereof to purchase or sell, and obligate us to sell or purchase, on specified dates, such securities at a specified purchase price, which may be based on a formula, all as set forth in the applicable prospectus supplement. We may, however, satisfy our obligations, if any, with respect to any purchase contract by delivering the cash value of such purchase contract or the cash value of the securities otherwise deliverable, as set forth in the applicable prospectus supplement. The applicable prospectus supplement will also specify the methods by which the holders may purchase or sell such securities and any acceleration, cancellation or termination provisions, provisions relating to U.S. federal income tax considerations, if any, or other provisions relating to the settlement of a purchase contract.

The purchase contracts may require us to make periodic payments to the holders thereof or vice versa, which payments may be deferred to the extent set forth in the applicable prospectus supplement, and those payments may be unsecured or pre-funded on some basis. The purchase contracts may require the holders thereof to secure their obligations in a specified manner to be described in the applicable prospectus supplement. Alternatively, purchase contracts may require holders to satisfy their obligations thereunder when the purchase contracts are issued. Our obligation to settle such pre-paid purchase contracts on the relevant settlement date may constitute indebtedness. Accordingly, pre-paid purchase contracts will be issued under either the senior indenture or the subordinated indenture.

We may issue rights to purchase our equity securities. These rights may be issued independently or together with any other security offered by this prospectus and may or may not be transferable by the shareholder receiving the rights in the rights offering. In connection with any rights offering, we may enter into a standby underwriting agreement with one or more underwriters pursuant to which the underwriter will purchase any securities that remain unsubscribed for upon completion of the rights offering.

The applicable prospectus supplement relating to any rights will describe the terms of the offered rights, including, where applicable, the following:

As specified in the applicable prospectus supplement, we may issue units consisting of one or more rights, purchase contracts, warrants, debt securities, preferred shares, common shares or any combination of such securities.  The applicable prospectus supplement will describe the terms of the offered units.  We expect that such terms will include, among others:

The following are the estimated expenses of the issuance and distribution of the securities being registered under the registration statement of which this prospectus forms a part, all of which will be paid by us.

The validity of the securities offered by this prospectus will be passed upon for us by Seward & Kissel LLP, New York, New York with respect to matters of United States and Marshall Islands law.

The consolidated financial statements, incorporated in this Prospectus by reference from the Company’s Annual Report on Form 20-F, for the year ended September 30,2018 have been audited by Deloitte Certified Public Accountants S.A., an independent registered public accounting firm, as stated in their report, which is incorporated herein by reference. Such consolidated financial statements have been so incorporated in reliance upon the report of such firm given upon their authority as experts in accounting and auditing. The offices of Deloitte Certified Public Accountants S.A. are located at Fragoklissias 3a & Granikou Street, Maroussi, Athens 151 24, Greece.

As required by the Securities Act, we filed a registration statement relating to the securities offered by this prospectus with the Commission. This prospectus is a part of that registration statement, which includes additional information.

We file annual and special reports with the Commission. You may read and copy any document that we file at the public reference room maintained by the Commission at 100 F Street, N.E., Washington, D.C. 20549. You may obtain information on the operation of the public reference room by calling 1 (800) SEC-0330. The Commission maintains a website (http://www.sec.gov) that contains reports, proxy and information statements and other information regarding registrants that file electronically with the Commission.

This prospectus and any prospectus supplement are part of a registration statement that we filed with the Commission and do not contain all of the information in the registration statement. The full registration statement may be obtained from the Commission or us, as indicated below. Forms of the indenture and other documents establishing the terms of the offered securities are filed as exhibits to the registration statement. Statements in this prospectus or any prospectus supplement about these documents are summaries and each statement is qualified in all respects by reference to the document to which it refers. You should refer to the actual documents for a more complete description of the relevant matters. You may inspect a copy of the registration statement at the Commission's Public Reference Room in Washington, D.C., as well as through the Commission's website.

The Commission allows us to “incorporate by reference” information that we file with it. This means that we can disclose important information to you by referring you to those filed documents. The information incorporated by reference is considered to be a part of this prospectus, and information that we file later with the Commission prior to the termination of this offering will also be considered to be part of this prospectus and will automatically update and supersede previously filed information, including information contained in this document.

We incorporate by reference the documents listed below:

We are also incorporating by reference all subsequent annual reports on Form 20-F that we file with the Commission and certain reports on Form 6-K that we furnish to the Commission after the date of this prospectus (if they state that they are incorporated by reference into this prospectus) until we file a post-effective amendment indicating that the offering of the securities made by this prospectus has been terminated. In all cases, you should rely on the later information over different information included in this prospectus or any prospectus supplement.

You should rely only on the information contained or incorporated by reference in this prospectus and subsequent filings. We have not, and any underwriters have not, authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not, and the underwriters are not, making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus and any accompanying prospectus supplement as well as the information we previously filed with the Commission and incorporated by reference, is accurate as of the dates on the front cover of those documents only. Our business, financial condition and results of operations and prospects may have changed since those dates.

You may request a free copy of the above mentioned filings or any subsequent filing we incorporated by reference to this prospectus by oral or written request to the following address:

Castor Maritime Inc.

Attn: Petros Panagiotidis

Christodoulou Chatzipavlou 223

Hawaii Royal Gardens, Apart. 16

3036 Limassol

Cyprus

+ 357 25 357 767

www.castormaritime.com

We will furnish holders of our common shares with annual reports containing audited financial statements and a report by our independent registered public accounting firm. The audited financial statements will be prepared in accordance with United States generally accepted accounting principles and those reports will include a “Management's Discussion and Analysis of Financial Condition and Results of Operations” section for the relevant periods. As a “foreign private issuer,” we are exempt from the rules under the Securities Exchange Act prescribing the furnishing and content of proxy statements to shareholders. While we intend to furnish proxy statements to any shareholder in accordance with the rules of the NASDAQ, those proxy statements are not expected to conform to Schedule 14A of the proxy rules promulgated under the Exchange Act. In addition, as a “foreign private issuer,” we are exempt from the rules under the Exchange Act relating to short swing profit reporting and liability.

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers or persons controlling the registrant pursuant to the foregoing provisions, the registrant has been informed that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is therefore unenforceable.

I. Article VIII of the Bylaws of the Registrant provides as follows:

II. Section 60 of the Associations Law of the Republic of the Marshall Islands provides as follows:

The exhibit index at the end of this registration statement, or the Exhibit Index, identifies the exhibits which are included in this registration statement and are incorporated herein by reference.

(a) The undersigned registrant hereby undertakes:

(1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

(i) To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;

(ii) To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20 percent change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective registration statement.

(iii) To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement. Provided, however, that paragraphs (a)(1)(i), (a)(1)(ii) and (a)(1)(iii) of this section do not apply if the registration statement is on Form S-3 or Form F-3 and the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the registrant pursuant to section 13 or section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

(2) That, for the purpose of determining any liability under the Securities Act of 1933, as amended, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(4) To file a post-effective amendment to the registration statement to include any financial statements required by Item 8.A. of Form 20-F at the start of any delayed offering or throughout a continuous offering. Financial statements and information otherwise required by Section 10(a)(3) of the Act need not be furnished, provided, that the registrant includes in the prospectus, by means of a post-effective amendment, financial statements required pursuant to this paragraph (a)(4) and other information necessary to ensure that all other information in the prospectus is at least as current as the date of those financial statements. Notwithstanding the foregoing, with respect to registration statements on Form F-3, a post-effective amendment need not be filed to include financial statements and information required by Section 10(a)(3) of the Securities Act of 1933 or Rule 3-19 of Regulation S-X if such financial statements and information are contained in periodic reports filed with or furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the Form F-3.

(5) That, for the purpose of determining liability under the Securities Act of 1933 to any purchaser:

(i) If the registrant is relying on Rule 430B:

(A) Each prospectus filed by the registrant pursuant to Rule 424(b)(3) shall be deemed to be part of this Registration Statement as of the date the filed prospectus was deemed part of and included in this Registration Statement; and

(B) Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information required by section 10(a) of the Securities Act of 1933 shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of 314 securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date.

(6) That, for the purpose of determining liability of the Registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the Securities, the undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this Registration Statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

(i) Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424;

(ii) Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant;

(iii) The portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and

(iv) Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.

(b) The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant's annual report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan's annual report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(c) — (d) Not applicable.

(e) The undersigned registrant hereby undertakes to deliver or cause to be delivered with the prospectus, to each person to whom the prospectus is sent or given, the latest annual report to security holders that is incorporated by reference in the prospectus and furnished pursuant to and meeting the requirements of Rule 14a-3 or Rule 14c-3 under the Securities Exchange Act of 1934; and, where interim financial information required to be presented by Article 3 of Regulation S-X is not set forth in the prospectus, to deliver, or cause to be delivered to each person to whom the prospectus is sent or given, the latest quarterly report that is specifically incorporated by reference in the prospectus to provide such interim financial information.

(f) — (g) Not applicable.

(h) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.

(i) Not applicable.

(j) The undersigned registrant hereby undertakes to file an application for the purpose of determining the eligibility of the trustee to act under subsection (a) of Section 310 of the Trust Indenture Act in accordance with the rules and regulations prescribed by the Commission under Section 305(b)(2) of the Trust Indenture Act.

(k) — (l) Not applicable.

$2,850,000

Common Shares

Prospectus Supplement

Maxim Group LLC