<SEC-DOCUMENT>0000899243-19-024083.txt : 20190923
<SEC-HEADER>0000899243-19-024083.hdr.sgml : 20190923
<ACCEPTANCE-DATETIME>20190923214555
ACCESSION NUMBER:		0000899243-19-024083
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20190919
FILED AS OF DATE:		20190923
DATE AS OF CHANGE:		20190923

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Sun Mountain Capital Partners LLC
		CENTRAL INDEX KEY:			0001788530
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39049
		FILM NUMBER:		191109084

	BUSINESS ADDRESS:	
		STREET 1:		C/O EXAGEN INC.
		STREET 2:		1261 LIBERTY WAY, SUITE C
		CITY:			VISTA
		STATE:			CA
		ZIP:			92081
		BUSINESS PHONE:		(760) 560-1501

	MAIL ADDRESS:	
		STREET 1:		C/O EXAGEN INC.
		STREET 2:		1261 LIBERTY WAY, SUITE C
		CITY:			VISTA
		STATE:			CA
		ZIP:			92081

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			NMSIC Focused LLC
		CENTRAL INDEX KEY:			0001788394
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39049
		FILM NUMBER:		191109085

	BUSINESS ADDRESS:	
		STREET 1:		C/O EXAGEN INC.
		STREET 2:		1261 LIBERTY WAY, SUITE C
		CITY:			VISTA
		STATE:			CA
		ZIP:			92081
		BUSINESS PHONE:		(760) 560-1501

	MAIL ADDRESS:	
		STREET 1:		C/O EXAGEN INC.
		STREET 2:		1261 LIBERTY WAY, SUITE C
		CITY:			VISTA
		STATE:			CA
		ZIP:			92081

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			NMSIC Co-Investment Fund, L.P.
		CENTRAL INDEX KEY:			0001788331
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-39049
		FILM NUMBER:		191109086

	BUSINESS ADDRESS:	
		STREET 1:		C/O EXAGEN INC.
		STREET 2:		1261 LIBERTY WAY, SUITE C
		CITY:			VISTA
		STATE:			CA
		ZIP:			92081
		BUSINESS PHONE:		(760) 560-1501

	MAIL ADDRESS:	
		STREET 1:		C/O EXAGEN INC.
		STREET 2:		1261 LIBERTY WAY, SUITE C
		CITY:			VISTA
		STATE:			CA
		ZIP:			92081

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			EXAGEN INC.
		CENTRAL INDEX KEY:			0001274737
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-MEDICAL LABORATORIES [8071]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1261 LIBERTY WAY
		CITY:			VISTA
		STATE:			CA
		ZIP:			92081
		BUSINESS PHONE:		(760) 560-1501

	MAIL ADDRESS:	
		STREET 1:		1261 LIBERTY WAY
		CITY:			VISTA
		STATE:			CA
		ZIP:			92081

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	EXAGEN DIAGNOSTICS INC
		DATE OF NAME CHANGE:	20031230
</SEC-HEADER>
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<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
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            <rptOwnerStreet2></rptOwnerStreet2>
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    <reportingOwner>
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        </reportingOwnerId>
        <reportingOwnerAddress>
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            <rptOwnerStreet2></rptOwnerStreet2>
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                    <value>See footnote</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
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                <directOrIndirectOwnership>
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                    <value>See footnote</value>
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                </natureOfOwnership>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
                <value>2019-09-19</value>
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                <directOrIndirectOwnership>
                    <value>I</value>
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                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
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            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
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                <transactionPricePerShare>
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            </postTransactionAmounts>
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                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F1"/>
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        </nonDerivativeTransaction>
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    <derivativeTable>
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            <transactionDate>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
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                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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                <natureOfOwnership>
                    <value>See footnotes</value>
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                    <footnoteId id="F6"/>
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                <natureOfOwnership>
                    <value>See footnotes</value>
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        <derivativeTransaction>
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            <expirationDate>
                <footnoteId id="F4"/>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <directOrIndirectOwnership>
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                <natureOfOwnership>
                    <value>See footnotes</value>
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                <transactionPricePerShare>
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                <natureOfOwnership>
                    <value>See footnotes</value>
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                <transactionPricePerShare>
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                <directOrIndirectOwnership>
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            <transactionAmounts>
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                <footnoteId id="F10"/>
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            <ownershipNature>
                <directOrIndirectOwnership>
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                <natureOfOwnership>
                    <value>See footnotes</value>
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        <derivativeTransaction>
            <securityTitle>
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            <transactionAmounts>
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                <transactionPricePerShare>
                    <footnoteId id="F11"/>
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            <expirationDate>
                <footnoteId id="F11"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F12"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series F Redeemable Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F11"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-09-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>112958220</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F13"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F13"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F13"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>615123</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series H Redeemable Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F12"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-09-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>53054485</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F14"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F14"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F14"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>288913</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F6"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The shares reported on this form are held of record by NMSIC Co-Investment Fund, L.P. (&quot;NMSIC&quot;) and NMSIC Focused, LLC (&quot;NMSIC Focused&quot;). NMSIC is the sole member of NMSIC Focused. Sun Mountain Capital Partners LLC (&quot;Sun Mountain&quot;) is the general partner of NMSIC. The controlling members of Sun Mountain are Brian Birk, Sally Coming and Lee Rand. As such, each of these entities and individuals may be deemed to share beneficial ownership of the shares held of record by NMSIC and NMSIC Focused. Each of Sun Mountain, Mr. Birk, Ms. Coming and Mr. Rand disclaims beneficial ownership of the securities held of record by NMSIC and NMSIC Focused.</footnote>
        <footnote id="F2">The warrants are currently exercisable and will expire on January 19, 2026.</footnote>
        <footnote id="F3">The warrants are currently exercisable and will expire on March 31, 2026.</footnote>
        <footnote id="F4">The warrants are currently exercisable and will terminate upon closing of the Issuer's initial public offering.</footnote>
        <footnote id="F5">Represents warrants that previously entitled the holders to purchase Series E Redeemable Convertible Preferred Stock, which, pursuant to their terms, were settled in shares of the Issuer's Common Stock.</footnote>
        <footnote id="F6">Represents securities held of record by NMSIC Focused.</footnote>
        <footnote id="F7">The Series A-3 Redeemable Convertible Preferred Stock (the &quot;Series A-3&quot;) is convertible into the Issuer's Common Stock on a 183.635-for-one basis at the holder's election and has no expiration date. The Series A-3 automatically converted into Common Stock upon the closing of the Issuer's initial public offering.</footnote>
        <footnote id="F8">Represents securities held of record by NMSIC.</footnote>
        <footnote id="F9">The Series C Redeemable Convertible Preferred Stock (the &quot;Series C&quot;) is convertible into the Issuer's Common Stock on a 57.294-for-one basis at the holder's election and has no expiration date. The Series C automatically converted into Common Stock upon the closing of the Issuer's initial public offering.</footnote>
        <footnote id="F10">The Series D Redeemable Convertible Preferred Stock (the &quot;Series D&quot;) is convertible into the Issuer's Common Stock on a 57.294-for-one basis at the holder's election and has no expiration date. The Series D automatically converted into Common Stock upon the closing of the Issuer's initial public offering.</footnote>
        <footnote id="F11">The Series E Redeemable Convertible Preferred Stock (the &quot;Series E&quot;) is convertible into the Issuer's Common Stock on a 57.294-for-one basis at the holder's election and has no expiration date. The Series E automatically converted into Common Stock upon the closing of the Issuer's initial public offering.</footnote>
        <footnote id="F12">Includes 448,921 and 672,308 shares of common stock underlying the Series E shares held by NMSIC and NMSIC Focused, respectively.</footnote>
        <footnote id="F13">The Series F Redeemable Convertible Preferred Stock (&quot;Series F&quot;) is convertible into the Issuer's Common Stock on a 183.635-for-one basis at the holder's election and has no expiration date. The Series F automatically converted into Common Stock upon the closing of the Issuer's initial public offering.</footnote>
        <footnote id="F14">The Series H Redeemable Convertible Preferred Stock (&quot;Series H&quot;) is convertible into the Issuer's Common Stock on a 183.635-for-one basis at the holder's election and has no expiration date. The Series H automatically converted into Common Stock upon the closing of the Issuer's initial public offering.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>NMSIC Co-Investment Fund, L.P., By: Sun Mountain Capital Partners LLC, its general partner,/s/ Brian Birk, Name: Brian Birk, Title: Managing Partner, /s/ Lee Rand, Name: Lee Rand, Title: Managing Member</signatureName>
        <signatureDate>2019-09-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>NMSIC Focused, LLC, By: NMSIC Co-Investment Fund, L.P., its sole member, By: Sun Mountain Capital Partners LLC, its general partner, /s/ Brian Birk, Name: Brian Birk, Title: Managing Partner, /s/ Lee Rand, Name: Lee Rand, Title: Managing Member</signatureName>
        <signatureDate>2019-09-23</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Sun Mountain Capital Partners LLC, /s/ Brian Birk, Name: Brian Birk, Title: Managing Partner, /s/ Lee Rand, Name: Lee Rand, Title: Managing Member</signatureName>
        <signatureDate>2019-09-23</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
