Company: CTRM
Filing Date: 2025-12-03
Form Type: 6-K
Source: 0001140361-25-044119
Chunk: 0

Company: Castor Maritime Inc.
Filing Date: 2025-12-03
Form: 6-K
Chunk 0
---
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 December 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 December 3, 2025, reporting the Company’s financial results for the three months and nine months ended September 30, 2025. 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: December 3, 2025 | CASTOR MARITIME INC. |                                                               |
|:------------------------|:---------------------|:--------------------------------------------------------------|
|                         | By:                  | /s/ Petros Panagiotidis                                       |
|                         |                      | Petros Panagiotidis                                           |
|                         |                      | Chairman, Chief Executive Officer and Chief Financial Officer |