Company: CTRM
Filing Date: 2025-10-15
Form Type: 6-K
Source: 0001140361-25-038160
Chunk: 0

Company: Castor Maritime Inc.
Filing Date: 2025-10-15
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 Entry into Senior Term Loan Facility Castor Maritime Inc. (“Castor”) announces the signing of a $50.0 million sustainability-linked senior term loan facility (the “Facility”) with a European bank. The Facility will be secured by, among others, a first priority mortgage over four of Castor’s dry bulk vessels and will be guaranteed by Castor. The net proceeds from the Facility will be used for general corporate purposes. The Facility has a tenor of five years and bears interest at a rate of Term SOFR plus a margin, which may be adjusted based on Castor’s performance against certain sustainability-linked targets. Full Redemption of Series E Preferred Shares On September 29, 2025, Castor entered into a share purchase agreement with Toro Corp. (“Toro”), pursuant to which Castor sold to Toro, 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”). Pursuant to the terms of the Series E Preferred Shares, Castor could redeem, at its option, the Series E Preferred Shares in whole or in party, at any time and from time to time on or after the day that is one month after September 30, 2025, at a cash redemption price equal to 100% of the stated amount of the Series E Preferred Shares plus accrued dividend to the redemption