-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 H96bfxFjSAwOEf/EUIpetpbblHvZMlLbtGDSmXK8dXj9xZJb218Wk0OdnSf2ns6q
 u0bpozn5uuCBhyfvjWAykg==

<SEC-DOCUMENT>0001484565-10-000002.txt : 20100319
<SEC-HEADER>0001484565-10-000002.hdr.sgml : 20100319
<ACCEPTANCE-DATETIME>20100319132005
ACCESSION NUMBER:		0001484565-10-000002
CONFORMED SUBMISSION TYPE:	D/A
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20100319
DATE AS OF CHANGE:		20100319
EFFECTIVENESS DATE:		20100319

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Capnia, Inc.
		CENTRAL INDEX KEY:			0001484565
		IRS NUMBER:				770523891
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-139006
		FILM NUMBER:		10693711

	BUSINESS ADDRESS:	
		STREET 1:		2445 FABER PLACE
		STREET 2:		SUITE 250
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94303
		BUSINESS PHONE:		650-213-8444

	MAIL ADDRESS:	
		STREET 1:		2445 FABER PLACE
		STREET 2:		SUITE 250
		CITY:			PALO ALTO
		STATE:			CA
		ZIP:			94303
</SEC-HEADER>
<DOCUMENT>
<TYPE>D/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0603</schemaVersion>

    <submissionType>D/A</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001484565</cik>
        <entityName>Capnia, Inc.</entityName>
        <issuerAddress>
            <street1>2445 FABER PLACE</street1>
            <street2>SUITE 250</street2>
            <city>PALO ALTO</city>
            <stateOrCountry>CA</stateOrCountry>
            <zipCode>94303</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>650-213-8444</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Ernest</firstName>
                <lastName>Mario</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2445 Faber Place</street1>
                <street2>Suite 250</street2>
                <city>Palo Alto</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94303</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Anish</firstName>
                <lastName>Bhatnagar</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2445 Faber Place</street1>
                <street2>Suite 250</street2>
                <city>Palo Alto</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94303</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>William James</firstName>
                <lastName>Alexander</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Capnia, Inc.</street1>
                <street2>2445 Faber Place, Suite 250</street2>
                <city>Palo Alto</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94303</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Gary</firstName>
                <lastName>Crooke</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Capnia, Inc.</street1>
                <street2>2445 Faber Place, Suite 250</street2>
                <city>Palo Alto</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94303</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Steinar</firstName>
                <middleName>J</middleName>
                <lastName>Engelsen</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Capnia, Inc.</street1>
                <street2>2445 Faber Place, Suite 250</street2>
                <city>Palo Alto</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94303</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Edgar</firstName>
                <lastName>Engleman</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Vivo Ventures</street1>
                <street2>575 High Street, Suite 201</street2>
                <city>Palo Alto</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94301</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Stephen</firstName>
                <middleName>N</middleName>
                <lastName>Kirnon</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>c/o Capnia, Inc,</street1>
                <street2>2445 Faber Place, Suite 250</street2>
                <city>Palo Alto</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94303</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification></relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other Health Care</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>true</isAmendment>
                <previousAccessionNumber>0001484565-10-000001</previousAccessionNumber>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2010-02-10</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isDebtType>true</isDebtType>
            <isOptionToAcquireType>true</isOptionToAcquireType>
            <isSecurityToBeAcquiredType>true</isSecurityToBeAcquiredType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>1</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>4700470</totalOfferingAmount>
            <totalAmountSold>3309227</totalAmountSold>
            <totalRemaining>1391243</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>28</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Capnia, Inc.</issuerName>
                <signatureName>/s/ANISH BHATNAGAR</signatureName>
                <nameOfSigner>Anish Bhatnagar</nameOfSigner>
                <signatureTitle>President</signatureTitle>
                <signatureDate>2010-03-19</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----