<SEC-DOCUMENT>0000899243-16-032257.txt : 20161025
<SEC-HEADER>0000899243-16-032257.hdr.sgml : 20161025
<ACCEPTANCE-DATETIME>20161025132210
ACCESSION NUMBER:		0000899243-16-032257
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20161025
FILED AS OF DATE:		20161025
DATE AS OF CHANGE:		20161025

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			iRhythm Technologies, Inc.
		CENTRAL INDEX KEY:			0001388658
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		IRS NUMBER:				208149544
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		650 TOWNSEND STREET
		STREET 2:		SUITE 380
		CITY:			San Francisco
		STATE:			CA
		ZIP:			94103
		BUSINESS PHONE:		415-632-5700

	MAIL ADDRESS:	
		STREET 1:		650 TOWNSEND STREET
		STREET 2:		SUITE 380
		CITY:			San Francisco
		STATE:			CA
		ZIP:			94103

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	IRhythm Technologies, Inc.
		DATE OF NAME CHANGE:	20110429

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	IRhythm Technologies Inc
		DATE OF NAME CHANGE:	20070201

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			New Leaf Venture Associates II, L.P.
		CENTRAL INDEX KEY:			0001441858
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37918
		FILM NUMBER:		161949978

	BUSINESS ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
		BUSINESS PHONE:		646 871-6400

	MAIL ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			HUNT RONALD
		CENTRAL INDEX KEY:			0001247851

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37918
		FILM NUMBER:		161949980

	MAIL ADDRESS:	
		STREET 1:		C/O CREDIT SUISSE 1ST BOSTON PRV EQY
		STREET 2:		11 MADISON AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10010

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Delagardelle Jeani
		CENTRAL INDEX KEY:			0001441563

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37918
		FILM NUMBER:		161949981

	MAIL ADDRESS:	
		STREET 1:		C/O NEW LEAF VENTURE PARTNERS, L.L.C.
		STREET 2:		2500 SAND HILL ROAD, SUITE 203
		CITY:			MENLO PARK
		STATE:			CA
		ZIP:			94025

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			New Leaf Ventures II, L.P.
		CENTRAL INDEX KEY:			0001441439
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37918
		FILM NUMBER:		161949982

	BUSINESS ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
		BUSINESS PHONE:		(646) 871-6400

	MAIL ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			New Leaf Venture Management II, L.L.C.
		CENTRAL INDEX KEY:			0001441857
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37918
		FILM NUMBER:		161949984

	BUSINESS ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036
		BUSINESS PHONE:		646 871-6400

	MAIL ADDRESS:	
		STREET 1:		TIMES SQUARE TOWER
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ratcliffe Liam
		CENTRAL INDEX KEY:			0001547100

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37918
		FILM NUMBER:		161949979

	MAIL ADDRESS:	
		STREET 1:		C/O NEW LEAF VENTURE PARTNERS
		STREET 2:		7 TIMES SQUARE - SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Chambon Philippe O.
		CENTRAL INDEX KEY:			0001192212

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37918
		FILM NUMBER:		161949983

	MAIL ADDRESS:	
		STREET 1:		C/O NEW LEAF VENTURE PARTNERS
		STREET 2:		7 TIMES SQUARE, SUITE 3502
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10036

	FORMER NAME:	
		FORMER CONFORMED NAME:	CHAMBON PHILIPPE
		DATE OF NAME CHANGE:	20020924
</SEC-HEADER>
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<TYPE>4
<SEQUENCE>1
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        <issuerName>iRhythm Technologies, Inc.</issuerName>
        <issuerTradingSymbol>IRTC</issuerTradingSymbol>
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            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001441563</rptOwnerCik>
            <rptOwnerName>Delagardelle Jeani</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURE PARTNERS,</rptOwnerStreet1>
            <rptOwnerStreet2>1200 PARK PLACE, SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>SAN MATEO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94403</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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    <reportingOwner>
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            <rptOwnerName>HUNT RONALD</rptOwnerName>
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        <reportingOwnerAddress>
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            <rptOwnerStreet2>7 TIMES SQUARE, SUITE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
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            <rptOwnerStateDescription></rptOwnerStateDescription>
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    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001547100</rptOwnerCik>
            <rptOwnerName>Ratcliffe Liam</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURE PARTNERS,</rptOwnerStreet1>
            <rptOwnerStreet2>7 TIMES SQUARE, SUITE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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        <reportingOwnerRelationship>
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            <isOfficer>0</isOfficer>
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    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001441858</rptOwnerCik>
            <rptOwnerName>New Leaf Venture Associates II, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURE PARTNERS,</rptOwnerStreet1>
            <rptOwnerStreet2>7 TIMES SQUARE, SUITE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001441857</rptOwnerCik>
            <rptOwnerName>New Leaf Venture Management II, L.L.C.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURE PARTNERS,</rptOwnerStreet1>
            <rptOwnerStreet2>7 TIMES SQUARE, SUITE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
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            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001192212</rptOwnerCik>
            <rptOwnerName>Chambon Philippe O.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NEW LEAF VENTURE PARTNERS,</rptOwnerStreet1>
            <rptOwnerStreet2>7 TIMES SQUARE, SUITE 3502</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10036</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2016-10-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1716589</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1716589</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2016-10-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>25000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>17.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
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                    <footnoteId id="F4"/>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Series C Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2016-10-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>610136</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1370887</value>
                    <footnoteId id="F4"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series D Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2016-10-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>190154</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>190154</value>
                    <footnoteId id="F4"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F5"/>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series E Convertible Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2016-10-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>155548</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F3"/>
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            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>155548</value>
                    <footnoteId id="F4"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series D Preferred Stock Warrant (Right to Buy)</value>
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            <conversionOrExercisePrice>
                <value>0.001</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2016-10-25</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>72389</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <value>2012-11-01</value>
            </exerciseDate>
            <expirationDate>
                <value>2019-11-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>72389</value>
                    <footnoteId id="F4"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Series C Convertible Preferred Stock converted into Common Stock on a 2.24685484-for-1 basis and had no expiration date.</footnote>
        <footnote id="F2">The Series D Convertible Preferred Stock converted into Common Stock on a 1-for-1 basis and had no expiration date.</footnote>
        <footnote id="F3">The Series E Convertible Preferred Stock converted into Common Stock on a 1-for-1 basis and had no expiration date.</footnote>
        <footnote id="F4">Reflects 5.882698 for 1 reverse stock split which became effective on October 5, 2016.</footnote>
        <footnote id="F5">Represents shares directly beneficially owned by New Leaf Ventures II, L.P. (&quot;NLV II&quot;). New Leaf Venture Associates II, L.P. (&quot;NLV Associates II&quot;) is the general partner of NLV II and New Leaf Venture Management II, L.L.C. (&quot;NLV Management II&quot;) is the general partner of NLV Associates II. Philippe O. Chambon, Jeani Delagardelle, Ronald Hunt, Vijay Lathi and Liam Ratcliffe are the individual managers of NLV Management II (the &quot;Individual Managers&quot;). NLV Associates II and NLV Management II disclaim beneficial ownership of such shares, except to the extent of their pecuniary interest therein. Vijay Lathi is a director of the Issuer and, accordingly, files separate Section 16 reports. As one of five individual managers, each of the Individual Managers disclaims beneficial ownership over the shares reported herein, and in all events disclaims pecuniary interest except to the extent of his or her economic interest.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, attorney-in-fact, Craig L. Slutzkin, attorney-in-fact for New Leaf Venture Management II, L.L.C., the sole general partner of New Leaf Venture Associates II, L.P., the sole general partner of New Leaf Ventures II, L.P.</signatureName>
        <signatureDate>2016-10-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, attorney-in-fact, Craig L. Slutzkin, attorney-in-fact for New Leaf Venture Management II, L.L.C., the sole general partner of New Leaf Venture Associates II, L.P.</signatureName>
        <signatureDate>2016-10-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, attorney-in-fact, Craig L. Slutzkin, attorney-in-fact for New Leaf Venture Management II, L.L.C.</signatureName>
        <signatureDate>2016-10-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, attorney-in-fact, Craig L. Slutzkin, attorney-in-fact for Philippe O. Chambon</signatureName>
        <signatureDate>2016-10-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, attorney-in-fact, Craig L. Slutzkin, attorney-in-fact for Jeani Delagardelle</signatureName>
        <signatureDate>2016-10-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, attorney-in-fact, Craig L. Slutzkin, attorney-in-fact for Ronald M. Hunt</signatureName>
        <signatureDate>2016-10-25</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Craig L. Slutzkin, attorney-in-fact, Craig L. Slutzkin, attorney-in-fact for Liam Ratcliffe</signatureName>
        <signatureDate>2016-10-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
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<SEQUENCE>2
<FILENAME>attachment1.htm
<DESCRIPTION>EX-99 DOCUMENT
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<PRE>
Exhibit 99


Form 3 Joint Filer Information

Name:  New Leaf Venture Associates II, L.P.

Address:  c/o New Leaf Venture Partners, 7 Times Square, Suite 3502
     New York, NY 10036

Designated Filer:  New Leaf Ventures II, L.P.

Issuer & Ticker Symbol:  iRhythm Technologies, Inc. (IRTC)

Date of Event Requiring Statement:  October 25, 2016

Signature:  /s/ Craig L. Slutzkin, attorney-in-fact, New Leaf Venture
     Associates II, L.P., as general partner of New Leaf Ventures II, L.P.


Name:  New Leaf Venture Management II, L.L. C.

Address:  c/o New Leaf Venture Partners, 7 Times Square, Suite 3502
     New York, NY 10036

Designated Filer:  New Leaf Ventures II, L.P.

Issuer & Ticker Symbol:  iRhythm Technologies, Inc. (IRTC)

Date of Event Requiring Statement:  October 25, 2016

Signature:  /s/ Craig L. Slutzkin, attorney-in-fact, New Leaf Venture
     Management II, L.L.C, as general partner of  New Leaf Venture
     Associates II, L.P


Name:  Philippe O. Chambon

Address:  c/o New Leaf Venture Partners, 7 Times Square, Suite 3502
      New York, NY 10036

Designated Filer:  New Leaf Ventures II, L.P.

Issuer & Ticker Symbol:  iRhythm Technologies, Inc. (IRTC)

Date of Event Requiring Statement:  October 25, 2016

Signature:  /s/ Craig L. Slutzkin, attorney-in-fact on behalf of
     Philippe O. Chambon, as Member of New Leaf Venture Management II, L.L.C


Name:  Jeani Delagardelle

Address:  c/o New Leaf Venture Partners, 1200 Park Place, Suite 300
     San Mateo, CA  94403

Designated Filer:  New Leaf Ventures II, L.P.

Issuer & Ticker Symbol:  iRhythm Technologies, Inc. (IRTC)

Date of Event Requiring Statement:  October 25, 2016

Signature:  /s/ Craig L. Slutzkin, attorney-in-fact on behalf of
     Jeani Delagardelle, as Member of New Leaf Venture Management II, L.L.C


Name:  Ronald M. Hunt

Address:  c/o New Leaf Venture Partners, 7 Times Square, Suite 3502
     New York, NY 10036

Designated Filer:  New Leaf Ventures II, L.P.

Issuer & Ticker Symbol:  iRhythm Technologies, Inc. (IRTC)

Date of Event Requiring Statement:  October 25, 2016

Signature:  /s/ Craig L. Slutzkin, attorney-in-fact on behalf of Ronald M. Hunt,
     as Member of New Leaf Venture Management II, L.L.C


Name:  Liam Ratcliffe

Address:  c/o New Leaf Venture Partners, 7 Times Square, Suite 3502
     New York, NY 10036

Designated Filer:  New Leaf Ventures II, L.P.

Issuer & Ticker Symbol:  iRhythm Technologies, Inc. (IRTC)

Date of Event Requiring Statement:  October 25, 2016

Signature:  /s/ Craig L. Slutzkin, attorney-in-fact on behalf of Liam Ratcliffe,
     as Member of New Leaf Venture Management II, L.L.C
</PRE>
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