FIRST AMENDMENT TO SUBLEASE

Exhibit 10.17

FIRST AMENDMENT TO SUBLEASE

THIS FIRST AMENDMENT TO SUBLEASE (this “Amendment”) is made and entered into effective as of June 1, 2010 (the “Effective Date”) between FREEDOMROADS, LLC, a Minnesota limited liability company (“Landlord”), and iRHYTHM TECHNOLOGIES, INC., a Delaware corporation (“Tenant”).

Recitals:

NOW, THEREFORE, in consideration of the foregoing and of the mutual covenants and promises contained herein and other good and valuable consideration, the receipt and sufficiency of which are hereby mutually acknowledged, Landlord and Tenant hereby agree as follows:

“A. The “Primary Term” (herein so called) of this Sublease shall begin on November 1, 2009 (the “Commencement Date”) and shall end on October 31, 2013. For purposes of this Sublease, a “Sublease Year” shall be defined as that twelve (12) month period during the Primary Term or any Extension Term (hereinafter defined) commencing, with respect to the first Lease Year, on the Commencement Date, and with respect to each subsequent Lease Year, the annual anniversary of the Commencement Date, as may be applicable. The Primary Term and any Extension Term are sometimes collectively referred to herein as the “Term”. Tenant shall have the right to access the Premises, the electrical panel serving the Building and the room adjacent to the Building’s electrical closet immediately upon execution of this Sublease for purposes of preparing the Premises for occupancy. Such access shall be on all of the terms hereof except the obligation to pay rent. Prior to the Commencement Date, Landlord shall relocate the current occupants from the Premises and perform the work described in Exhibit “C” attached hereto.”

“B. Provided that Tenant is not in default of any terms or conditions of this Sublease beyond applicable notice and cure periods at the time of exercise or at the expiration of the Primary Term, Tenant shall have the option of extending this Sublease for two (2) additional terms (each, an “Extension Term”) of three (3) years each on the same terms and conditions as provided herein except for the Base Annual Rent (defined below), which shall be adjusted as set forth below. Effective on the first day of each Extension Term (each, an “Adjustment Date”), if applicable, Base Annual Rent shall be increased by any amount equal to the Base Annual Rent for the then expiring Lease Year multiplied by the CPI Increase (as defined below). As used herein, (i) the CPI Increase shall be equal to a fraction, the numerator of which shall be the CPI Index (as defined below) for the month which is thirty-eight (38) months prior to the Adjustment Date and the denominator of which shall be the CPI Index for the month which is two months prior to the Adjustment Date and (ii) the “CPI Index” shall mean the Consumer Price Index for All Urban Consumers, All Items, U.S.A. Area, 1982-1984 = 100, as published by the Bureau of Labor Statistics, United States Department of Labor (Chicago-Gary-Kenosha, IL-IN-WI). If the CPI Index is discontinued, the CPI Index shall then mean the most nearly comparable index published by the Bureau of Labor Statistics or other official agency of the United States Government as determined by Landlord. Notwithstanding the foregoing, in no event shall the Base Annual Rent be decreased in any Extension Term. Notice of the exercise of each such option shall be delivered by Tenant to Landlord in writing not later than April 30, 2013 as to the first Extension Term and April 30, 2016 as to the second Extension Term”

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B. “The Rent payable hereunder shall begin to accrue on December 1, 2009 (the “Rent Commencement Date”). Commencing on the Rent Commencement Date and continuing through the Primary Term, Tenant hereby covenants and agrees to pay to Landlord, for the use and occupancy of the Demised Premises, at the times and in the manner herein provided, the following sums of money (“Rent”):

to be paid in U.S. dollars, in advance, without offset or deduction and without notice or invoice from Landlord, on the first day of each and every month during the Term, except as otherwise provided for herein. All payments provided for in this Sublease (those hereinafter stipulated as well as Base Annual Rent) shall be paid or mailed to:

FreedomRoads, LLC

250 Parkway Drive

Suite 270

Lincolnshire, IL 60069

Attn: Accounting Department

or to such other payee or address as Landlord may designate in writing to Tenant. Notwithstanding the foregoing, provided that Tenant is not in default hereunder beyond the expiration of any applicable notice and cure periods, Tenant shall receive an abatement of Rent for the months of March 2010, May 2010, July 2010 and August 2010.”

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“A. Landlord agrees to cause the necessary mains, conduits and other facilities to be provided to make heating, ventilation, air-conditioning, water, sewer, gas, phone and electricity available to the Demised Premises and to make available to Tenant heating, ventilation, air-conditioning, water, sewer, gas, phone and electrical services during the Term of this Lease. Tenant shall be responsible for the payment of all utilities used by Tenant at the Demised Premises, including, without limitation, gas, electric, water and sewer, directly to the applicable public utility provider. Tenant shall have 24-hours, 7-days per week control of the HVAC system serving the Premises and may use, at Tenant’s expense, the security system serving the Building.”

“D. In the event of a failure or interruption of utilities within the Premises, Landlord shall promptly repair or remediate the cause of the utility failure or interruption using all means within Landlord’s commercially reasonable control, Landlord hereby acknowledging that such prompt repairs shall include after-hours repairs as needed due to Tenant’s 24/7 use of the Premises. Notwithstanding the foregoing, if the responsibility for repair or remediation is that of the utility company or other entity, Tenant shall take reasonable measures to cause such utility company or other entity to repair or remediate the cause of the utility failure or interruption; provided, however, Landlord shall be responsible for any amounts charged by the utility company or other entity in performing such repair or remediation.

“E. Tenant shall be responsible for all of its janitorial and cleaning services for the Demised Premises at Tenant’s expense. Tenant shall provide a service for the collection of refuse and garbage from the Premises, at Tenant’s expense.”

“A. Except for the repair and maintenance obligations of Tenant set forth in Section 7(B) below, Landlord shall be responsible for the repair and maintenance of the Demised Premises during the Term, including, without limitation, those items designated as the responsibility of Landlord on the “Responsibility Matrix” (herein so called) attached hereto as Exhibit “H”.

B. Tenant shall be responsible, at its sole cost and expense, for (i) the repair of any and all damage caused to the Property by Tenant or its employees, agents or

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“Subject to approval by Landlord and all applicable governmental authorities, Tenant shall have the right to install Tenant’s signage (including logo) on the existing monument sign on the west side of the Property visible from Milwaukee Avenue. Tenant shall have the exclusive right to such sign and all other signage at the Property at all times, including, without limitation, signage on the west entrance to the Building and directional signs and shipping and receiving signs near the east side of the Building, subject to approval of applicable governmental authorities. Tenant may make any changes to the signs required to cause the signs to comply with laws. Upon the expiration or earlier termination of the Sublease, Tenant shall remove such signs; provided, however, in no event may Tenant remove the monument from the Property. Tenant promptly shall make such repairs and restoration of the Property as are necessary to repair any damage to the Property from the removal of the signs.”

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IN WITNESS WHEREOF, the parties hereto have executed this Amendment on the day and year first mentioned, the corporate party or parties by its or their proper officers thereto duly authorized.

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Master Landlord hereby consents to the Amendment.

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SCHEDULE 1

LEGAL DESCRIPTION OF PROPERTY

THE LAND REFERRED TO IN THIS POLICY IS DESCRIBED AS FOLLOWS:

THAT PART OF TAX NORTHEAST 1/4 OF SECTION 22, TOWNSHIP 43 NORTH, RANGE 11, EAST OF THE THIRD PRINCIPAL MERIDIAN, DESCRIBED AS FOLLOWS, TO-WIT: COMMENCING AT A POINT ON THE CENTER LINE OF MILWAUKEE AVENUE (AS OF AUSUST 26, 1948) WHICH IS SOUTH 15 DEGREES 06 MINUTES 15 SECONDS EAST (OLD DEEDS), 813.60 FEET FROM THE POINT OP INTERSECTION OF SAID CENTER LINE WITH THE NORTH LINE OF THE NORTHEAST 1/4 OF SAID SECTION 22 FOR A POINT OF BEGINNING; THENCE NORTH 99 DEGREES 25 MINUTES 30 SECONDS EAST (OLD DEEDS), TOWARD A POINT ON THE EAST LINE OF SAID NORTHEAST 1/4 764.05 FEET SOUTH OF THE NORTHEAST CORNER THEREOF, SAID COURSE HEREINAFTER REFERRED TO AS THE “FIRST COURSE”, A.OISTANCE OF 516.67 FEET, MORE OR LESS, TO A POINT ON A LINE DRAWN PARALLEL WITH THE CENTER LINE OF MILWAUKEE AVENUE AND 500.00 FEET NORTHEASTERLY THEREFROM, MEASURED AT RIGHT ANGLES THERETO; THENCE NORTHWESTERLY ALONG SAID LINE DRAWN PARALLEL TO THE CENTER LINE OF MILWAUKEE AVENUE, A DISTANCE OF 300 FEET; THENCE WEST ALONG A LINE PARALLEL TO THE FIRST COURSE, A DISTANCE OF 516.67 FEET, MORE OR LESS, TO A POINT ON THE CENTER LINE OF MILWAUKEE AVENUE WHICH POINT IS 513.60 FEET SOUTHEASTERLY OF ITS INTERSECTION WITH THE NORTH LINE OF SAID SECTION 22; THENCE SOUTHEASTERLY ALONG THE CENTER LINE OR MILWAUKEE AVENUE, A DISTANCE OF 300 FEET TO THE POINT OF BEGINNING, IN LAKE COUNTY, ILLINOIS.

SCHEDULE 2

EXHIBIT “H”

RESPONSIBILITY MATRIX

2 Marriott Dr. Responsible Party Assignments

Agreement between Camping World and iRhythm Technologies

Version Date: 6/11/10

SCHEDULE 3

EXHIBIT “E”

FFE INVENTORY

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