Form10-Q (Mark One) QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 For the quarterly period ended March 31, 2026OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 Commission file number: 001-37918_______________________________________________________________________ iRhythm Holdings, Inc. (Exact Name of Registrant as Specified in its Charter)_______________________________________________________________________ (415) 632-5700(Registrant’s Telephone Number, Including Area Code)Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether the registrant: (1)has filed all reports required to be filed by Section13 or 15(d) of the SecuritiesExchange Act of 1934 during the preceding 12months (or for such shorter period that the registrant was required to file such reports),and (2)has been subject to such filing requirements for the past 90days.Yes☑No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuantto Rule405 of RegulationS-T (§ 232.405 of this chapter) during the preceding 12months (or for such shorter period that the registrantwas required to submit and post such files).Yes☑No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reportingcompany, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reportingcompany,” and “emerging growth company” in Rule12b-2 of the Exchange Act. Large accelerated filer☑Accelerated filer☐Non-accelerated filer☐Smaller reporting company☐Emerging growth company☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ As of April23, 2026, the number of outstanding shares of the registrant’s common stock, par value $0.001 per share, was 32,862,408. IRHYTHM HOLDINGS, INC.TABLE OF CONTENTS PART I. FINANCIAL INFORMATION Item1. Financial Statements (Unaudited):Condensed Consolidated Balance SheetsCondensed Consolidated Statements of OperationsCondensed Consolidated Statements of Comprehensive LossCondensed Consolidated Statements of Cash FlowsCondensed Consolidated Statements of Stockholders’ EquityNotes to Condensed Consolidated Financial StatementsItem2. Management’s Discussion and Analysis of Financial Condition and Results of OperationsItem3. Quantitative and Qualitative Disclosures About Market RiskItem4. Controls and Procedures PART II. OTHER INFORMATION Item1. Legal ProceedingsItem1A. Risk FactorsItem2. Unregistered Sales of Equity Securities and Use of ProceedsItem3. Defaults Upon Senior SecuritiesItem4. Mine Safety DisclosuresItem5. Other InformationItem6. Exhibits Exhibit Index Signatures SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of Section 27A of theSecurities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, asamended (the “Exchange Act”). All statements contained in this Quarterly Report on Form 10-Q other than statements ofhistorical fact, including statements concerning our plans, objectives, and expectations for our business, operations, andfinancial performance and condition, are forward-looking statements. In some cases, you can identify forward-lookingstatements by terminology such as “anticipate,” “assume,” “believe,” “contemplate,” “continue,” “could,” “due,” “estimate,”“expect,” “goal,” “intend,” “may,” “objective,” “plan,” “predict,” “potential,” “positioned,” “seek,” “should,” “target,” “will,”“would”, and other similar expressions that are predictions of or indicate future events and future trends, or the negative ofthese terms or other comparable terminology. These forward-looking statements include, but are not limited to, statementsabout: •the expected impact of global business, political, and macroeconomic conditions, including inflation, interest ratevolatility, cybersecurity events, potential instability in the global banking system, volatile market conditions, theimpact of tariffs, the impact of any significant political and regulatory developments, global events, including publichealth crises, and ongoing geopolitical conflicts, such as the wars in Ukraine and Iran and conflicts in the MiddleEast and Venezuela, on our business, operations, and financial results;•the impact of supply chain disruptions on our operations and financial results;•the impact of inflationary costs on our operations and financial results;•plans to conduct further clinical studies, including any clinical trials initiated by third parties;•our plans to modify our current systems and ser