Company: CTRM
Filing Date: 2025-10-01
Form Type: 6-K
Source: 0001140361-25-036884
Chunk: 0

Company: Castor Maritime Inc.
Filing Date: 2025-10-01
Form: 6-K
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13A-16 OR 15D-16 OF THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2025 Commission File Number: 001-38802 CASTOR MARITIME INC. (Translation of registrant’s name into English) 223 Christodoulou Chatzipavlou Street, Hawaii Royal Gardens, 3036 Limassol, Cyprus (Address of principal executive office) Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

| Form 20-F ☒ |     | Form 40-F  ☐ |

INFORMATION CONTAINED IN THIS FORM 6-K REPORT Second Quarter and Half Year Results for 2025 Attached to this report on Form 6-K as Exhibit 99.1 is a copy of the press release issued by Castor Maritime Inc. (“Castor”) on October 1, 2025, reporting Castor’s financial results for the three months and six months ended June 30, 2025. Private Placement of Series E Preferred Shares On September 29, 2025, Castor entered into a share purchase agreement (the “Purchase Agreement”) with Toro Corp. (“Toro”), pursuant to which, subject to the terms and conditions set forth therein, Castor has agreed to issue and sell, and Toro has agreed to purchase, for an aggregate consideration of $60,000,000 in cash, 60,000 of Castor’s 8.75% Series E cumulative perpetual convertible preferred shares, par value $0.001 per share, with a cumulative preferred distribution accruing at a rate of 8.75% per annum on the stated amount of $1,000 per share (the “Series E Preferred Shares”). The 60,000 Series D Preferred Shares will be issued in a private placement pursuant to Section 4(a)(2) of the Securities Act and Regulation D promulgated thereunder. Immediately following completion of the transaction, Toro will beneficially own all 60,000 outstanding Series D Preferred Shares. We intend to use the net proceeds for the sale of securities offered by this prospectus for capital expenditures, working capital, funding for vessel and other asset or share acquisitions or for other general corporate purposes or a combination thereon. Dividends