---
schema_version: "secwatch.filing_event.v1"
accession: "0001388658-25-000105"
form_type: "8-K"
ticker: "IRTC"
cik: "0001388658"
company_name: "iRhythm Holdings, Inc."
filed_at: "2025-05-01T23:59:59+00:00"
generated_at: "2026-05-23T00:04:01.921604+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# iRhythm Q1 revenue up 20% to $158.7M; raises FY 2025 guidance

## Summary
- Revenue $158.7M (+20.3% YoY); gross margin 68.8% (+250 bps).
- Net loss narrowed to $30.7M ($0.97 diluted EPS) from $45.7M ($1.47) last year.
- Adjusted net loss $30.3M ($0.95 diluted EPS) vs $38.1M ($1.23) in Q1 2024.
- Cash $520.6M; raised FY25 revenue guidance to $690–700M and adj. EBITDA margin to 7.5–8.5%.
- Operational: Zio AT strength, Japan commercial launch, studies showing LTCM superiority.

## SEC filing metadata
- accession: 0001388658-25-000105
- form_type: 8-K
- ticker: IRTC
- cik: 0001388658
- company_name: iRhythm Holdings, Inc.
- filed_at: 2025-05-01T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1388658/000138865825000105/0001388658-25-000105-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1388658/000138865825000105/irtc-20250501.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001388658-25-000105
- JSON: https://secwatch.observer/filing/0001388658-25-000105.json
- Plain text: https://secwatch.observer/filing/0001388658-25-000105.txt

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