Exhibit 99.1

iRhythm Technologies Announces Third Quarter 2017 Financial Results

and Raises Guidance for Full Year 2017

SAN FRANCISCO, November 1, 2017 -- iRhythm Technologies, Inc. (NASDAQ: IRTC), a leading digital health care solutions company focused on the advancement of cardiac care, today reported financial results for the three and nine months ended September 30, 2017.

Recent Highlights

“Third quarter and year-to-date performance highlight the progress we are making in establishing our Zio Service as the new standard of care for ambulatory cardiac monitoring,” said Kevin King, CEO. "This consistent growth in demand has enabled us to confidently expand our salesforce and infrastructure throughout 2017, as well as make significant progress in growing in-network coverage, which has meaningfully increased our productivity and volume.”

Third Quarter Financial Results

Revenue for the three months ended September 30, 2017 was $25.0 million, an increase of 49% year-over-year and 5% sequentially.  Revenue growth remains predominantly driven by increased volume of the Zio Service in both new and existing accounts, as well as continued success with in-network contracting efforts.   

Gross profit for the third quarter of 2017 was $18.1 million, or 72% gross margin, up from $11.5 million, or 69% gross margin, in the same period of the prior year. Margin expansion is primarily attributable to productivity gains through the company’s machine-learned algorithms associated with report generation, the impact from the mix shift to contracted claims, and continued reduction of device-related manufacturing costs.  

Operating expenses for the third quarter of 2017 were $24.1 million, an increase of 70% compared to $14.2 million for the same period of the prior year. The increase in operating expenses was primarily driven by accelerated salesforce expansion investments and a material increase in stock-based compensation.

Loss from operations for the third quarter of 2017 was $6.5 million, compared to $4.1 million for the same period of the prior year.

Cash, cash equivalents, and investments totaled $107.4 million as of September 30, 2017.

Guidance for Full Year 2017

iRhythm projects revenue for the full year 2017 to range from $96 to $97 million, gross margins for the full year 2017 to range from 71.5% to 72.5% and operating expenses for the full year 2017 to be between $93 and $95 million. This compares to previous guidance of $94 to $96 million in revenue, 71.5% to 72.5% in gross margins, and $89 and $92 million in operating expenses for the full year 2017 provided on August 2, 2017.

Webcast and Conference Call Information

iRhythm’s management team will host a conference call today beginning at 1:30 p.m. PT / 4:30 p.m. ET. Investors interested in listening to the conference call may do so by dialing (844) 348-0016 for domestic callers or (213) 358-0876 for international callers, and referencing Conference ID: 96279903 or from the webcast on the “Investor Relations” section of the company’s website at: www.irhythmtech.com.

About iRhythm Technologies, Inc. 
iRhythm is a leading digital health care company redefining the way cardiac arrhythmias are clinically diagnosed. The company combines wearable biosensor devices worn for up to 14 days and cloud-based data analytics with powerful proprietary algorithms that distill data from millions of heartbeats into clinically actionable information. The company believes improvements in arrhythmia detection and characterization have the potential to change clinical management of patients.

Forward-Looking Statements

This news release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995. These statements include, but are not limited to, statements regarding expectations for expansion in our salesforce, increases in our in-network contracting and financial guidance. Such statements are based on current assumptions that involve risks and uncertainties that could cause actual outcomes and results to differ materially. These risks and uncertainties, many of which are beyond our control, include risks described in the section entitled “Risk Factors” and elsewhere in our Form 10-Q filing made with the Securities and Exchange Commission on August 7, 2017. These forward-looking statements speak only as of the date hereof and should not be unduly relied upon. iRhythm disclaims any obligation to update these forward-looking statements.

IRHYTHM TECHNOLOGIES, INC.

Condensed Consolidated Balance Sheets

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(In thousands)

IRHYTHM TECHNOLOGIES, INC.

Condensed Consolidated Statements of Operations

(Unaudited)

(In thousands, except share and per share data)