Company: CMDB
Filing Date: 2025-08-21
Form Type: 6-K
Source: 0001171843-25-005529
Chunk: 0

Company: Costamare Bulkers Holdings Ltd
Filing Date: 2025-08-21
Form: 6-K
Chunk 0
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<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR
15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2025

Commission File Number: 001-42581

COSTAMARE BULKERS HOLDINGS LIMITED(Translation of registrant’s name into English)

7 rue du Gabian, MC 98000 Monaco (Address of principal executive office)</div>

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 ☐

<div align='center'>INCORPORATION BY REFERENCE</div>

Exhibits 99.1 and 99.2 to this Report on Form 6-K shall be incorporated
by reference into our registration statements on Form F-3, as filed with the U.S. Securities and Exchange Commission on May 30, 2025 (File
No. 333-287685), to the extent not superseded by information subsequently filed or furnished (to the extent we expressly state that we
incorporate such furnished information by reference) by us under the Securities Act of 1933 or the Securities Exchange Act of 1934, in
each case as amended.

<div align='center'>EXHIBIT INDEX</div>

<div align='center'>SIGNATURES</div>

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.

Date: August 21, 2025

| COSTAMARE BULKERS HOLDINGS LIMITED |                         |
| By:                                | /s/ Gregory G. Zikos    |
| Name:                              | Gregory G. Zikos        |
| Title:                             | Chief Executive Officer |