---
schema_version: "secwatch.filing_event.v1"
accession: "0001388658-23-000048"
form_type: "8-K"
ticker: "IRTC"
cik: "0001388658"
company_name: "iRhythm Holdings, Inc."
filed_at: "2023-05-04T23:59:59+00:00"
generated_at: "2026-06-15T21:23:48.885131+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# iRhythm reports Q1 revenue $111.4M (+20.6% YoY); updates FY2023 guidance to $480-$490M

## Summary
- Revenue $111.4M (+20.6% YoY); gross margin 67.9%, up 100 bps from 66.9%.
- Net loss $39.1M ($1.29 loss per share) vs $50.6M ($1.71 loss per share) in Q1 2022.
- Adjusted net loss $33.4M ($1.10 loss per share) vs $23.7M ($0.80 loss per share) in Q1 2022.
- FY2023 revenue guidance raised to $480-$490M (17%-19% growth); gross margin 69%-70% expected.
- CAMELOT study at ACC.23/WCC showed Zio XT highest diagnostic yield, lowest retesting rates.

## SEC filing metadata
- accession: 0001388658-23-000048
- form_type: 8-K
- ticker: IRTC
- cik: 0001388658
- company_name: iRhythm Holdings, Inc.
- filed_at: 2023-05-04T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1388658/000138865823000048/0001388658-23-000048-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1388658/000138865823000048/irtc-20230504.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001388658-23-000048
- JSON: https://secwatch.observer/filing/0001388658-23-000048.json
- Plain text: https://secwatch.observer/filing/0001388658-23-000048.txt

## Key facts
- Earnings Releases
  iRhythm Holdings, Inc. reported Full year 2023 results: revenue $480 million to $490 million.
  - Period: Full year 2023
  - Revenue: $480 million to $490 million
  - Result: guidance update
  source text: Updated fiscal year 2023 revenue guidance to a range of approximately $480 million to $490 million
  evidence_url: https://www.sec.gov/Archives/edgar/data/1388658/000138865823000048/0001388658-23-000048-index.htm
- Earnings Releases
  iRhythm Holdings, Inc. reported Three months ended March 31, 2023 results: net income -$33.4 million, EPS -$1.10.
  - Period: Three months ended March 31, 2023
  - Net income: -$33.4 million
  - EPS: -$1.10
  - Result: reported results
  source text: Revenue of $111.4 million, a 20.6% increase compared to first quarter 2022
  evidence_url: https://www.sec.gov/Archives/edgar/data/1388658/000138865823000048/0001388658-23-000048-index.htm
- Earnings Releases
  iRhythm Holdings, Inc. reported Three months ended March 31, 2023 results: net income -$33.4 million, EPS -$1.10.
  - Period: Three months ended March 31, 2023
  - Net income: -$33.4 million
  - EPS: -$1.10
  - Result: reported results
  source text: Net loss for the first quarter of 2023 was $39.1 million, or a loss of $1.29 per share
  evidence_url: https://www.sec.gov/Archives/edgar/data/1388658/000138865823000048/0001388658-23-000048-index.htm
- Earnings Releases
  iRhythm Holdings, Inc. reported Three months ended March 31, 2023 results: net income -$33.4 million, EPS -$1.10.
  - Period: Three months ended March 31, 2023
  - Net income: -$33.4 million
  - EPS: -$1.10
  - Result: reported results
  source text: Adjusted net loss for th e first quarter of 2023 was $33.4 million, or a loss of $1.10 per share
  evidence_url: https://www.sec.gov/Archives/edgar/data/1388658/000138865823000048/0001388658-23-000048-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.