<SEC-DOCUMENT>0002005790-26-000006.txt : 20260209
<SEC-HEADER>0002005790-26-000006.hdr.sgml : 20260209
<ACCEPTANCE-DATETIME>20260209201458
ACCESSION NUMBER:		0002005790-26-000006
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20260206
FILED AS OF DATE:		20260209
DATE AS OF CHANGE:		20260209

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Hamilton Brian T
		CENTRAL INDEX KEY:			0002005790
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38589
		FILM NUMBER:		26613091

	MAIL ADDRESS:	
		STREET 1:		5415 EVERGREEN WAY
		CITY:			EVERETT
		STATE:			WA
		ZIP:			98203

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COASTAL FINANCIAL CORP
		CENTRAL INDEX KEY:			0001437958
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		ORGANIZATION NAME:           	02 Finance
		EIN:				000000000
		STATE OF INCORPORATION:			WA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		5415 EVERGREEN WAY
		CITY:			EVERETT
		STATE:			WA
		ZIP:			98203
		BUSINESS PHONE:		425-257-1652

	MAIL ADDRESS:	
		STREET 1:		5415 EVERGREEN WAY
		CITY:			EVERETT
		STATE:			WA
		ZIP:			98203
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wk-form4_1770686095.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-02-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001437958</issuerCik>
        <issuerName>COASTAL FINANCIAL CORP</issuerName>
        <issuerTradingSymbol>CCB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002005790</rptOwnerCik>
            <rptOwnerName>Hamilton Brian T</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5415 EVERGREEN WAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>EVERETT</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98203</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President of CCBX</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>1</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-02-06</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>48</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>88.95</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>77332</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.</footnote>
        <footnote id="F2">Represents shares sold in payment of withholding taxes upon partial vesting of RSUs.</footnote>
        <footnote id="F3">Includes the following pursuant to the 2018 Coastal Financial Corporation Omnibus Incentive Plan: (1) 15,698 restricted stock units (RSUs) with remaining shares vesting monthly in an approximately equal amount through April 30, 2028 (2) Includes 7,387 performance-based RSUs which are eligible to vest on the first day of each month beginning October 1, 2024 until April 30, 2028, the quantity of which is subject to continuous employment and achievement of certain stock price conditions (3) 15,000 performance-based RSUs - eligible to vest on April 30, 2028, subject to continuous employment and achievement of return on equity that is at least 80% of company comparator peer group. (4) 502 RSUs that vest in three approximately equal remaining installments. Each RSU represents the right to receive one share of common stock upon vesting.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Melisa Nelson, as Attorney-in-fact</signatureName>
        <signatureDate>2026-02-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
