<SEC-DOCUMENT>0001209191-19-050606.txt : 20190924
<SEC-HEADER>0001209191-19-050606.hdr.sgml : 20190924
<ACCEPTANCE-DATETIME>20190924211202
ACCESSION NUMBER:		0001209191-19-050606
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20190920
FILED AS OF DATE:		20190924
DATE AS OF CHANGE:		20190924

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:		191111908

	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:		225 SOUTH LAKE AVENUE
		STREET 2:		SUITE 1050
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101
		BUSINESS PHONE:		626-304-3400

	MAIL ADDRESS:	
		STREET 1:		225 SOUTH LAKE AVENUE
		STREET 2:		SUITE 1050
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91101

	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>
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<SEQUENCE>1
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<DESCRIPTION>FORM 4 SUBMISSION
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                    <value>66645</value>
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                <transactionPricePerShare>
                    <value>5.10</value>
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                    <value>28.00</value>
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    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.10</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2019-09-20</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4250</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2010-01-01</value>
                <footnoteId id="F6"/>
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            <expirationDate>
                <value>2019-10-08</value>
            </expirationDate>
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                <underlyingSecurityTitle>
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            <conversionOrExercisePrice>
                <value>5.10</value>
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                <value>2019-09-23</value>
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            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
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                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <value></value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
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    <footnotes>
        <footnote id="F1">This option exercise was completed as the underlying option was due to expire in October 2019.</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 $29.00 to $29.10, 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 $28.00 to $28.03, 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 $29.00 to $29.10, 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">Includes a total of 933,333 shares underlying restricted stock units that may be earned based on the achievement of certain performance goals. If the performance goals are not met within the required time periods, the awards will be forfeited in part or in whole.</footnote>
        <footnote id="F6">Represents first vesting date. Option vested over two years from date of grant.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Chris Anzalone</signatureName>
        <signatureDate>2019-09-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</DOCUMENT>
</SEC-DOCUMENT>
