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iRhythm Technologies

IRTC
35
Medical - Devices · Healthcare
Price
$128.52
+0.54 (+0.42%)
Market Cap
$4.22B
Exchange
NASDAQ
Winston Score
35
Winston is serious
Below-average fundamentals — multiple weak pillars.
Data as of Aug 23, 2026 · filings through Jun 30, 2026
How the score breaks down
Quality
Mixed
Growth
Strong
Cash Flow
Weak
Stability
Weak
Valuation
Data not available

Share count rising — dilution

+9.1% over 4y

The company has issued more shares over this period, which dilutes each existing shareholder’s stake.

Diluted shares outstanding: 29.3M (2021) → 32.0M (2025)

Winston Score History

The full picture

iRhythm Technologies makes a small, wearable heart monitor called the Zio patch. Patients wear it on their chest for up to two weeks, and it records their heart rhythm the entire time. Doctors use the data to detect irregular heartbeats, like atrial fibrillation, that shorter tests might miss. iRhythm sells primarily to hospitals, cardiology clinics, and primary care physicians across the United States.

The company makes money by charging for each Zio patch used, combining the hardware with a cloud-based analysis service that processes the heart data and delivers a report to the physician. Most of its revenue comes from the US, though it has been expanding into the UK and other international markets. iRhythm's main competitive advantage is its large database of heart rhythm data and its established relationships with physicians. The biggest risk the company faces is reimbursement rates from Medicare and private insurers, which directly affect how much revenue it collects per patch.

Growth Profile

When traditional metrics don't capture the full picture, these are the signals growth stock investors use instead.

Revenue Growth

+20.1% YoY

YoY Growth Rate

Steady revenue growth

EPS Growth

+97.7% YoY

YoY Growth Rate

Strong earnings growth

R&D Spend

$85M/ year

Declining (-19% vs prior year)

11.3% of revenue

Below sector average (18%)

R&D spend declining — could signal cost-cutting or efficiency

Insider Activity

6.3%ownership

Flat

Insider ownership roughly steady over the past year

Cash Position

Cash flow positive

$665M cash & investments

Quarterly Free Cash Flow

↑ Burn rate improving

Company generates more cash than it spends — no dilution risk from fundraising

Growth + cash flow

iRhythm Technologies is a rare growth stock that's already generating positive cash flow while growing at 20%. The Winston Score doesn't fully credit this transition from "burner" to "earner."

The Winston Score above measures business quality today. Growth stocks often score lower because they invest in the future rather than maximising current profits. These metrics show what matters most for evaluating that future.

Score breakdown

Every number that matters to educated investors.

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Quality

Profit per sale
Gross Margin
72.8%
Premium pricing power — 72.8% gross margin
Profit after running costs
Operating Margin
-1.1%
Losing money on operations — -1.1%
Return on the money invested
ROCE
-1.1%
Weak — -1.1% return on capital

Negative ROIC means the business is losing money on every dollar invested in it.

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Growth

Sales growth
Sales YoY
+25.6%
Fast-growing sales (+25.6% YoY)
Profit growth
EPS YoY
N/A
Data not available
How steady the profit is
EPS Consistency
7/8 quarters
Every recent quarter grew earnings vs last year

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Cash Flow

Profit that turns into cash
Cash Conversion
N/A
Data not available
Spare cash per sale
FCF Margin
0.7%
Thin free cash flow (0.7%)

FCF margin between 0% and 10%. Some cash from sales, but not a lot.

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Stability

What it owes vs what it owns
Debt / Equity
3.51
Heavy debt load (3.51)
Covers its interest
Interest Cover
N/A
Data not available

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Valuation

Price vs profit
P/E Ratio (TTM)
N/M
Negative earnings — P/E not meaningful
Cheaper or dearer next year
P/E vs Forward
N/A
not available
Data not available

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Dividends

Not applicable for this business.
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