<SEC-DOCUMENT>0001415889-24-027294.txt : 20241119
<SEC-HEADER>0001415889-24-027294.hdr.sgml : 20241119
<ACCEPTANCE-DATETIME>20241119204342
ACCESSION NUMBER:		0001415889-24-027294
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20241117
FILED AS OF DATE:		20241119
DATE AS OF CHANGE:		20241119

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Teehan Brendan
		CENTRAL INDEX KEY:			0001891900
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-50768
		FILM NUMBER:		241477975

	MAIL ADDRESS:	
		STREET 1:		C/O ACADIA PHARMACEUTICALS INC.
		STREET 2:		12830 EL CAMINO REAL, SUITE 400
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92130

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ACADIA PHARMACEUTICALS INC
		CENTRAL INDEX KEY:			0001070494
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				061376651
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		12830 EL CAMINO REAL
		STREET 2:		SUITE 400
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92130
		BUSINESS PHONE:		858-558-2871

	MAIL ADDRESS:	
		STREET 1:		12830 EL CAMINO REAL
		STREET 2:		SUITE 400
		CITY:			SAN DIEGO
		STATE:			CA
		ZIP:			92130
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4-11202024_011138.xml
<TEXT>
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    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2024-11-17</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001070494</issuerCik>
        <issuerName>ACADIA PHARMACEUTICALS INC</issuerName>
        <issuerTradingSymbol>ACAD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001891900</rptOwnerCik>
            <rptOwnerName>Teehan Brendan</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ACADIA PHARMACEUTICALS INC.</rptOwnerStreet1>
            <rptOwnerStreet2>12830 EL CAMINO REAL, SUITE 400</rptOwnerStreet2>
            <rptOwnerCity>SAN DIEGO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92130</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>EVP, COO, HEAD OF COMMERCIAL</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <transactionCode>M</transactionCode>
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            <transactionAmounts>
                <transactionShares>
                    <value>9913</value>
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                <transactionPricePerShare>
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                <sharesOwnedFollowingTransaction>
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                <sharesOwnedFollowingTransaction>
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        </nonDerivativeTransaction>
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            <securityTitle>
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                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
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    <derivativeTable>
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            <securityTitle>
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                <value>2024-11-17</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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                <transactionShares>
                    <value>9913</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F5"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F5"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9913</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                </natureOfOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Stock Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
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            <transactionDate>
                <value>2024-11-17</value>
            </transactionDate>
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                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>9913</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
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            </exerciseDate>
            <expirationDate>
                <footnoteId id="F6"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>9913</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>9913</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.</footnote>
        <footnote id="F2">Includes 431 shares of the Issuer's common stock acquired by the reporting person on November 15, 2024 pursuant to an employee stock purchase plan.</footnote>
        <footnote id="F3">The mandatory sales reported in this Form 4 were made to cover withholding taxes and tax related items imposed by the Issuer in connection with the vesting of restricted stock units, and it is intended to comply with the requirements of Rule 10b5-1(c)(1)(i)(B) under the Exchange Act and be interpreted to meet the requirements of Rule 10b5-1(c).</footnote>
        <footnote id="F4">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.7947 to $16.81, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.</footnote>
        <footnote id="F5">The restricted stock units vest as follows: 37.5% of the shares vest 18 months from the grant date; 12.5% of the shares vest on the second anniversary of the grant date; and 25% of the shares vest on each of the third and fourth anniversaries of the grant date.</footnote>
        <footnote id="F6">The restricted stock units vest as follows: 37.5% of the shares vest 18 months from the grant date; 12.5% of the shares vest on the second anniversary of the grant date; and 25% of the shares vest on each of the third and fourth anniversaries of the grant date. In addition, these restricted stock units may vest earlier upon the Issuer's common stock achieving a specified price per share over a specified trading period.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Jennifer J. Rhodes, Attorney-in-Fact</signatureName>
        <signatureDate>2024-11-19</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
