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iRhythm Q1 2025 Earnings: Can Strong Growth and Margin Turnaround Outweigh Transition Headwinds?

Henry RiversWednesday, Apr 30, 2025 3:47 am ET
29min read

iRhythm Technologies (IRTC) is set to report its first-quarter 2025 earnings on May 1, offering investors a critical update on the company’s progress toward its ambitious goals. With revenue growth, margin expansion, and the ongoing transition to its newer Zio monitor at the forefront, the results will test whether the digital health pioneer can sustain momentum amid shifting market dynamics. Let’s break down what to watch.

Revenue Growth: Hitting the $675M Runway

In 2024, iRhythm delivered a 20.1% revenue increase to $591.8M, driven by strong adoption of its Zio platform for long-term cardiac monitoring (LTCM). For 2025, the company aims to grow revenue to $675–685M, implying a 14–15% year-over-year increase. Analysts will scrutinize Q1 results to see if this trajectory holds.

The Zio platform’s success hinges on volume growth, which management has called “progressively accelerating” in recent quarters. A key question: Is the momentum from late 2024 carrying into 2025? Investors should watch for details on U.S. and international customer adoption, particularly in markets like the UK, where the Zio XT recently secured a landmark recommendation from the National Institute for Health and Care Excellence (NICE).

IRTC Total Revenue YoY, Total Revenue

Margin Expansion: Turning the Corner?

Margins are a critical focus. In Q4 2024, gross margin hit 70%—a 410 basis-point improvement from the same period in 2023—thanks to operational efficiencies. For 2025, the company projects an Adjusted EBITDA margin of 7–8%, a dramatic turnaround from the -7.7% reported in 2024.

Achieving this will require tight cost management, especially as the company transitions to its next-gen Zio monitor. The new device, introduced in late 2023, now accounts for 70% of U.S. registrations, but its higher R&D and marketing costs could pressure margins in the near term. Investors will want to see how management balances growth investments with profitability.

Zio XT vs. Zio Monitor: Navigating the Transition

The Zio XT’s regulatory win in the UK is a bright spot. NICE’s endorsement—marking the first successful evaluation of a digital health tool through its pilot program—could unlock NHS funding and accelerate adoption. However, the newer Zio monitor, which is 62% lighter and offers better patient compliance, is rapidly displacing the older model in the U.S. market.

This creates a split dynamic: The Zio XT’s NICE-backed strength in the UK contrasts with the shift to the next-gen device in the U.S. and other markets. While the older model’s regulatory success is a positive, investors must assess whether the transition to the Zio monitor is cannibalizing Zio XT sales or creating net new demand.

Global Expansion and Clinical Validation

iRhythm’s push into Europe—where the Zio monitor is now available in Austria, the Netherlands, Spain, and Switzerland—is another key area. The company’s strategy of using clinical studies (e.g., the CAMELOT trial) to demonstrate cost savings and diagnostic superiority over Holter monitors has been vital. The American College of Cardiology’s findings, showing that only ~20% of arrhythmias correlate with symptoms, underscore the need for long-term monitoring, a space iRhythm dominates.

Conclusion: A High-Wire Act for iRhythm

iRhythm’s Q1 results will determine whether its 2025 guidance is achievable. On the positive side, the NICE win in the UK, strong U.S. volume trends, and a robust cash position ($535.6M as of late 2024) provide a foundation for growth. However, the transition to the newer Zio monitor—while strategically necessary—adds execution risk.

A successful report would show:
1. Revenue growth in line with the $675M+ annual target, driven by both U.S. volume and international expansion.
2. Margin improvement toward the 7–8% Adjusted EBITDA goal, signaling operational discipline.
3. Zio XT adoption in the UK offsetting any slowdown in U.S. sales, while the newer device gains traction globally.

The stakes are high. With a market cap of ~$2.5B and a stock price that has fluctuated sharply in recent years (see below), investors will demand clarity on whether iRhythm can balance innovation, margin management, and geographic diversification.

IRTC Closing Price

In the end, the earnings call will reveal whether iRhythm is truly scaling its platform or if it’s caught between legacy success and the challenges of next-gen innovation. For now, the data points are mixed—but the path to $685M is clear. Execution is everything.

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