<SEC-DOCUMENT>0001209191-21-070467.txt : 20211217
<SEC-HEADER>0001209191-21-070467.hdr.sgml : 20211217
<ACCEPTANCE-DATETIME>20211217201404
ACCESSION NUMBER:		0001209191-21-070467
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20211215
FILED AS OF DATE:		20211217
DATE AS OF CHANGE:		20211217

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Anzalone Christopher Richard
		CENTRAL INDEX KEY:			0001423029

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38042
		FILM NUMBER:		211503370

	MAIL ADDRESS:	
		STREET 1:		ARROWHEAD RESEARCH CORPORATION
		STREET 2:		201 SOUTH LAKE AVENUE, SUITE 703
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ARROWHEAD PHARMACEUTICALS, INC.
		CENTRAL INDEX KEY:			0000879407
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				460408024
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0930

	BUSINESS ADDRESS:	
		STREET 1:		177 E COLORADO BLVD
		STREET 2:		SUITE 700
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91105
		BUSINESS PHONE:		626-696-4702

	MAIL ADDRESS:	
		STREET 1:		177 E COLORADO BLVD
		STREET 2:		SUITE 700
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91105

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ARROWHEAD RESEARCH CORP
		DATE OF NAME CHANGE:	20040112

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTERACTIVE GROUP INC
		DATE OF NAME CHANGE:	20020509

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTERACTIVE INC
		DATE OF NAME CHANGE:	19940224
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
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    <periodOfReport>2021-12-15</periodOfReport>

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    <issuer>
        <issuerCik>0000879407</issuerCik>
        <issuerName>ARROWHEAD PHARMACEUTICALS, INC.</issuerName>
        <issuerTradingSymbol>ARWR</issuerTradingSymbol>
    </issuer>

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        <reportingOwnerId>
            <rptOwnerCik>0001423029</rptOwnerCik>
            <rptOwnerName>Anzalone Christopher Richard</rptOwnerName>
        </reportingOwnerId>
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            <rptOwnerStreet1>177 E. COLORADO BLVD</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 700</rptOwnerStreet2>
            <rptOwnerCity>PASADENA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>91105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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                <value>Common Stock</value>
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            <transactionDate>
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            </transactionDate>
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            <transactionAmounts>
                <transactionShares>
                    <value>25857</value>
                    <footnoteId id="F1"/>
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                <transactionPricePerShare>
                    <value>66.28</value>
                    <footnoteId id="F2"/>
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                <transactionAcquiredDisposedCode>
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                    <value>3074</value>
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                    <value>68.20</value>
                    <footnoteId id="F4"/>
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                    <value>3235234</value>
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                <directOrIndirectOwnership>
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            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
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                <value></value>
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                <transactionShares>
                    <value>9223</value>
                    <footnoteId id="F1"/>
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                <transactionPricePerShare>
                    <value>69.52</value>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                    <value>3226011</value>
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            <securityTitle>
                <value>Common Stock</value>
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            <transactionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
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            <transactionAmounts>
                <transactionShares>
                    <value>6989</value>
                    <footnoteId id="F1"/>
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                <transactionPricePerShare>
                    <value>70.19</value>
                    <footnoteId id="F6"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
                    <value>3219022</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
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    <footnotes>
        <footnote id="F1">The sale was made to generate proceeds to cover the tax liability incident to the vesting of restricted stock units.  Of the total 60,000 shares sold, 50,000 of the shares were sold pursuant to a 10b5-1 trading plan adopted by the Reporting Person in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended.</footnote>
        <footnote id="F2">The price reported on Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $65.75 to $66.74, inclusive. The reporting person undertakes to provide to Arrowhead Pharmaceuticals, Inc., any security holder of Arrowhead Pharmaceuticals, Inc., 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 ranges set forth in this footnote of this Form 4.</footnote>
        <footnote id="F3">The price reported on Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $66.76 to $67.75, inclusive. The reporting person undertakes to provide to Arrowhead Pharmaceuticals, Inc., any security holder of Arrowhead Pharmaceuticals, Inc., 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 ranges set forth in this footnote of this Form 4.</footnote>
        <footnote id="F4">The price reported on Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.82 to $68.80, inclusive. The reporting person undertakes to provide to Arrowhead Pharmaceuticals, Inc., any security holder of Arrowhead Pharmaceuticals, Inc., 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 ranges set forth in this footnote of this Form 4.</footnote>
        <footnote id="F5">The price reported on Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.94 to $69.94, inclusive. The reporting person undertakes to provide to Arrowhead Pharmaceuticals, Inc., any security holder of Arrowhead Pharmaceuticals, Inc., 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 ranges set forth in this footnote of this Form 4.</footnote>
        <footnote id="F6">The price reported on Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.96 to $70.32, inclusive. The reporting person undertakes to provide to Arrowhead Pharmaceuticals, Inc., any security holder of Arrowhead Pharmaceuticals, Inc., 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 ranges set forth in this footnote of this Form 4.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Christopher Anzalone</signatureName>
        <signatureDate>2021-12-17</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
