Company: CTRM
Filing Date: 2025-07-29
Form Type: 6-K
Source: 0001140361-25-027692
Chunk: 0

Company: Castor Maritime Inc.
Filing Date: 2025-07-29
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 July 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 Attached to this report on Form 6-K as Exhibit 99.1 is a copy of the press release issued by Castor Maritime Inc. (the “Company”) on July 29, 2025, announcing the date of its 2025 Annual General Meeting of Shareholders. Attached to this report on Form 6-K as Exhibit 99.2 are the proxy materials for the 2025 Annual Meeting of Shareholders of the Company. Attached to this report on Form 6-K as Exhibit 99.3 is the proxy card for the 2025 Annual Meeting of Shareholders of the Company. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

| Dated: July 29, 2025 | CASTOR MARITIME INC. |                                                               |
|:---------------------|:---------------------|:--------------------------------------------------------------|
|                      | By:                  | /s/ Petros Panagiotidis                                       |
|                      |                      | Petros Panagiotidis                                           |
|                      |                      | Chairman, Chief Executive Officer and Chief Financial Officer |