The filing lists higher material component costs, tariffs, scrap, freight, and amortization costs related to Zio monitor hardware as iRhythm's volume increased. The Zio business is growing, but its cost base is also rising.
That is the filing's central tension. In the three months ended June 30, revenue climbed 20.1% to $224.2 million, while gross profit grew faster, up 22.8% to $163.2 million. Gross margin reached 72.8%, up 1.6 percentage points from the comparable period.
The income statement moved close to the line. Operating loss narrowed from $18.7 million to $2.5 million, and net loss shrank from $14.2 million to $381,000. On paper, growth covered far more of the company's expenses than in the comparable period.
The balance sheet adds a less tidy detail, without explaining it away. Cash stood at $246.7 million, down from $309.1 million in the comparable period, while inventory rose 22.4% to $22.5 million. Accounts receivable increased only 2.6% to $84.3 million, so the inventory build is the sharper working-capital movement.
Management attributes the revenue increase to demand for iRhythm Services. Its description of the cost base is more crowded.
"For the three and six months ended June 30, 2026, the increase was primarily due to increases in material component costs (inclusive of tariffs), amortization costs related to Zio monitor and Zio AT PCBA, material and PCBA scrap costs, headcount-related costs, and freight costs associated with the increase in volume of iRhythm Services."
10-Q 2026-08-06
More volume brought more of nearly everything attached to producing and delivering that volume. Gross margin still improved, but the company says cost of revenue will rise in absolute dollars as revenue rises, with fixed-cost scale providing only a partial offset.
The cash-flow disclosure supplies the other important receipt. Operating cash flow improved by $5.1 million, but the company points to payment timing and a smaller net loss, while also citing higher prepaid and other current assets. That is operating cash flow, not the same thing as the $62.4 million year-over-year difference in the cash balance.
"Cash provided by operating activities increased by $5.1 million, primarily attributable to reductions in our net loss driven by our revenue growth and timing of payments associated with our accounts payable and accrued liabilities, Offsetting these increases in cash provided from operating activities were increases in our prepaid and other current assets, as well as other long-term assets."
10-Q 2026-08-06
The company's annual results show this is not a one-period growth spurt: revenue rose from $591.8 million in 2024 to $747.1 million in 2025, while annual operating margin improved to negative 7.7%. The latest three-month result pushes that margin to negative 1.1%, but diluted shares also increased 2.8% year over year.
At the latest close, iRhythm had a $4.1 billion market capitalization and traded at 5.2 times enterprise value to annual sales. Those figures put the focus on a specific accounting question rather than a broad demand question: how much of the growth becomes durable cash after inventory, tariffs, materials, and freight are paid for.
The next 10-Q's cash-flow statement and inventory balance will clarify whether this period's near-break-even result is accompanied by a cleaner cash conversion profile.
The tension is simple: iRhythm is growing quickly and losing almost no money, but it is still carrying more inventory and less cash.