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SEC EDGAR · Insider purchase

SBLK: Zagari Raffaele reported buying shares

2 reported purchases of non-derivative securities. Code P includes open-market and private purchases; it does not establish motive.

Follow SBLK
Became public
Sep 17, 2026, 11:02 AM EDT
Event / period date
Sep 15, 2026
Collected
Nov 9, 2026, 3:17 PM EST

Why this is connected

This filing identifies Star Bulk Carriers Corp. as the issuer of the security. The company's SEC identifier connects it to SBLK.

Open the original source ↗Follow company activity in SBLK

Reported transactions

Zagari Raffaele (Director)

10,000 shares · Common shares, par value $0.01 per share

Sep 15, 2026 · $28.27 per share

50,000 shares · Common shares, par value $0.01 per share

Sep 15, 2026 · $28.27 per share

Value calculated from the reported shares and prices: $1,696,200.00.

Code P covers open-market and private purchases. Grants, option exercises, and tax withholding are excluded from purchase results. Read the source footnotes for ownership and pricing details.

Source evidence

Read the source excerpt or record
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0609</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-09-15</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001386716</issuerCik>
        <issuerName>Star Bulk Carriers Corp.</issuerName>
        <issuerTradingSymbol>SBLK</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002005037</rptOwnerCik>
            <rptOwnerName>Zagari Raffaele</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>C/O STAR BULK MANAGEMENT INC</rptOwnerStreet1>
            <rptOwnerStreet2>40 AG KONSTANTINOU</rptOwnerStreet2>
            <rptOwnerCity>ATHENS</rptOwnerCity>
            <rptOwnerNonUSStateTerritory></rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>J3</rptOwnerCountry>
            <rptOwnerZipCode>15124</rptOwnerZipCode>
            <rptOwnerStateDescription>GREECE</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common shares, par value $0.01 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2026-09-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>10000</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>28.27</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>37580</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common shares, par value $0.01 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2026-09-15</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>50000</value>
                    <footnoteId id="F4"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>28.27</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1953000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Corporation</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">euro 24.50</footnote>
        <footnote id="F2">Participation in the Parallel Offering undertaken by STAR BULK CARRIERS CORP  in Greece, following its dual listing on Euronext Athens, pursuant to which  I personally subscribed  to 10,000 new common shares at the offering price</footnote>
        <footnote id="F3">These shares are held by two corporations in which the reporting person indirectly holds 100% of the economic interest and over which the reporting person has investment control</footnote>
        <footnote id="F4">Participation in the Public Offering undertaken by STAR BULK CARRIERS CORP  in Greece, following its dual listing on Euronext Athens, pursuant to which the entity (Augustea Med ltd.) subscribed  to 50,000 new common shares at the offering price</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Raffaele Zagari</signatureName>
        <signatureDate>2026-09-17</signatureDate>
    </ownerSignature>
</ownershipDocument>

Congressional trading in SBLK

These disclosures provide context. Their presence does not establish a link between a trader and the event.

Original documents control. Public records can be amended, and company connections may require interpretation. Nothing here is investment advice.