<SEC-DOCUMENT>0001209191-19-031840.txt : 20190521
<SEC-HEADER>0001209191-19-031840.hdr.sgml : 20190521
<ACCEPTANCE-DATETIME>20190521190406
ACCESSION NUMBER:		0001209191-19-031840
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20190521
FILED AS OF DATE:		20190521
DATE AS OF CHANGE:		20190521

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DHALIWAL SUNIL
		CENTRAL INDEX KEY:			0001354177

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38897
		FILM NUMBER:		19843674

	MAIL ADDRESS:	
		STREET 1:		20 WILLIAM STREET
		STREET 2:		SUITE 200
		CITY:			WELLESLEY
		STATE:			MA
		ZIP:			02481

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Fastly, Inc.
		CENTRAL INDEX KEY:			0001517413
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-PREPACKAGED SOFTWARE [7372]
		IRS NUMBER:				275411834
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		475 BRANNAN
		STREET 2:		SUITE 300
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107
		BUSINESS PHONE:		415-525-3481

	MAIL ADDRESS:	
		STREET 1:		475 BRANNAN
		STREET 2:		SUITE 300
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94107

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Skycache, Inc.(DE)
		DATE OF NAME CHANGE:	20110405
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
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<DESCRIPTION>FORM 4 SUBMISSION
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6598407</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-05-21</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1787460</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1787460</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1787460</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each share of Series Seed Convertible Preferred Stock automatically converted into Class B Common Stock on a 1:1 basis immediately upon the closing of the Issuer's initial public offering. The Series Seed Convertible Preferred Stock has no expiration date.</footnote>
        <footnote id="F2">Each share of Class B Common Stock will convert automatically into Class A Common Stock upon any transfer except certain &quot;Permitted Transfers&quot; described in the Issuer's amended and restated certificate of incorporation. Following the closing of the initial public offering, all outstanding shares of Class B Common Stock will convert into shares of Class A Common Stock upon the earliest of (i) the first trading day falling nine months after the date on which the shares of Class B Common Stock represent less than 10% of the aggregate number of outstanding shares of Class A Common Stock and Class B Common Stock, (ii) the date specified by the vote of the holders of Class B Common Stock representing at least a majority of the outstanding shares of Class B Common Stock, or (iii) the first trading day falling ten years after the Effective Time as defined in the Issuer's amended and restated certificate of incorporation.</footnote>
        <footnote id="F3">These shares are held directly by Amplify Partners, L.P. The sole general partner is Amplify GP Partners, LLC. Sunil Dhaliwal, a member of the Issuer's Board of Directors, is a managing member of Amplify GP Partners, LLC, and may be deemed to have voting and investment power with respect to these securities. Amplify GP Partners, LLC and Sunil Dhaliwal disclaims beneficial ownership of the securities except to the extent of his or its pecuniary interest therein.</footnote>
        <footnote id="F4">Each share of Series A Convertible Preferred Stock automatically converted into Class B Common Stock on a 1:1 basis immediately upon the closing of the Issuer's initial public offering. The Series A Convertible Preferred Stock has no expiration date.</footnote>
        <footnote id="F5">Each share of Series B Convertible Preferred Stock automatically converted into Class B Common Stock on a 1:1 basis immediately upon the closing of the Issuer's initial public offering. The Series B Convertible Preferred Stock has no expiration date.</footnote>
        <footnote id="F6">Each share of Series C Convertible Preferred Stock automatically converted into Class B Common Stock on a 1:1 basis immediately upon the closing of the Issuer's initial public offering. The Series C Convertible Preferred Stock has no expiration date.</footnote>
        <footnote id="F7">These shares are held directly by AP Opportunity Fund LLC. The sole general partner is Amplify GP Partners, LLC. Sunil Dhaliwal, a member of the Issuer's Board of Directors, is a managing member of Amplify GP Partners, LLC, and may be deemed to have voting and investment power with respect to these securities. Amplify GP Partners, LLC and Sunil Dhaliwal disclaims beneficial ownership of the securities except to the extent of his or its pecuniary interest therein.</footnote>
        <footnote id="F8">Each share of Series D Convertible Preferred Stock automatically converted into Class B Common Stock on a 1:1 basis immediately upon the closing of the Issuer's initial public offering. The Series D Convertible Preferred Stock has no expiration date.</footnote>
        <footnote id="F9">Each share of Series E Convertible Preferred Stock automatically converted into Class B Common Stock on a 1:1 basis immediately upon the closing of the Issuer's initial public offering. The Series E Convertible Preferred Stock has no expiration date.</footnote>
        <footnote id="F10">Each share of Series F Convertible Preferred Stock automatically converted into Class B Common Stock on a 1:1 basis immediately upon the closing of the Issuer's initial public offering. The Series F Convertible Preferred Stock has no expiration date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Seth Gottlieb, Attorney-in-Fact</signatureName>
        <signatureDate>2019-05-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
