UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 6-K

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STAR BULK CARRIERS CORP.

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Attached as Exhibit 1.1 is a copy of the Second Amended and Restated At-The-Market Sales Agreement, dated October 9, 2026, by and between Star Bulk Carriers Corp. (the “Company”) and Deutsche Bank Securities Inc. in respect of the related at-the-market (ATM) equity offering (the “Deutsche Bank ATM Offering”).

Attached as Exhibit 1.2 is a copy of the Second Amended and Restated At-The-Market Sales Agreement, dated October 9, 2026, by and between the Company and Jefferies LLC in respect of the related at-the-market (ATM) equity offering (the “Jefferies ATM Offering”).

Attached to this Report as Exhibit 5.1 is the opinion of Seward & Kissel LLP, relating to the common shares, par value $0.01 per share (the “Common Shares”), in respect of the Deutsche Bank ATM Offering.

Attached to this Report as Exhibit 5.2 is the opinion of Seward & Kissel LLP, relating to the Common Shares in respect of the Jefferies ATM Offering.

A copy of the press release of the Company dated October 9, 2026 titled “Star Bulk Carriers Corp. Announces Renewal of Existing ATM Equity Offering Programs” is furnished hereto as Exhibit 99.1 of this Form 6-K.

The information contained in this Current Report on Form 6-K (including the exhibits hereto other than Exhibit 99.1) is hereby incorporated by reference into the registrant’s Registration Statement on Form F-3 (File No. 333-286185) and Registration Statement on Form S-8 (File No. 333-299360), to be a part thereof from the date on which this report is submitted, to the extent not superseded by documents or reports subsequently filed or furnished.

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.