Pulmonx Corporation (LUNG) Cash Flow Statement

The conversion ratio has moved from 0.92 in 2025Q1 to 0.38 in 2026Q3, which suggests that non-cash add-backs such as stock-based compensation and depreciation are absorbing a growing share of the reported loss. Stock-based compensation of $3.6M in the latest quarter accounts for a meaningful portion of that gap, so the net loss alone understates the underlying cash consumption of the business. The improving ratio should not be read as an earnings quality improvement, since operations consumed cash in every period shown.

The margin improvement is substantial, but it appears driven by revenue growth and cost discipline rather than any structural shift toward cash generation. Capital expenditure remains under 2% of revenue, so the burn is almost entirely operating in nature. Investors should monitor whether the margin trend continues toward breakeven, since the current trajectory still implies reliance on external funding sources that are not detailed in the supplied data.

These swings are large relative to the company's cash flow base and suggest that operating cash flow in any single quarter may not reflect the sustainable run rate. The pattern warrants further investigation into collection timing and inventory management, since a reversal of the recent inflow would likely widen the cash burn. Interpretation should rely on multi-quarter averages rather than individual periods.

Low capital intensity means the company's cash needs are driven by operating expenses rather than fixed asset investment, which is consistent with a device company that may rely on outsourced manufacturing and direct sales. Depreciation of $622K in 2026Q3 is not being matched by meaningful replacement spending, which may indicate a small asset base rather than an underinvestment concern. The primary cash question is therefore operating burn rather than reinvestment.

The cumulative cash burn is the most material signal in the dataset, as it shows operations consumed cash in every quarter without a single period of positive free cash flow. Stock-based compensation provides non-cash relief to the income statement, but it represents a real economic cost to shareholders through dilution. Investors should monitor the balance between cash on hand and the pace of continued burn to assess how long current resources can sustain operations.