Owens Corning (OC) Cash Flow Statement

The OCF/NI ratio is erratic, with negative quarters in 2025Q3 and 2025Q4 despite positive operating cash flow, suggesting that net income is distorted by large non-cash impairments or one-time items. In 2026Q2, OCF/NI of 1.08 appears healthy, but the preceding quarters show a pattern where operating cash flow often exceeds or lags net income by wide margins, implying that accruals and working capital swings dominate the conversion process. Investors should monitor the sustainability of cash conversion, as the gap between net income and operating cash flow is not stable.

The FCF trajectory is highly volatile, with positive quarters in mid-2025 and negative quarters in early 2026, reflecting the cyclicality of the construction materials business. The latest quarter (2026Q2) shows a negative FCF margin of -6.8%, which appears to be driven by a surge in capex to $432M, the highest in the period, and a significant working capital outflow of -$489M. This suggests that the company is investing heavily, possibly in growth initiatives, but the timing of these investments is causing cash flow to diverge from underlying profitability.

The capex-to-revenue ratio has more than doubled from the 2024 average of around 6% to 15.7% in 2026Q2, indicating that OC is in an investment phase, possibly for capacity expansion or modernization. This elevated capex, combined with negative free cash flow, implies that the company is prioritizing long-term growth over near-term cash generation. However, given the volatile demand environment, investors should assess whether this capital spending will generate adequate returns, especially as depreciation and amortization ($349M in 2026Q2) are not yet covering the increased investment.

The working capital line is the most volatile component of operating cash flow, with large positive contributions in late 2025 and large negative contributions in early 2026. This pattern suggests that OC is experiencing significant swings in inventory build-up or receivable collections, possibly due to demand fluctuations or supply chain disruptions. The negative working capital change in 2026Q2 (-$489M) is particularly notable, as it more than offsets the positive net income, indicating that cash is being tied up in operations. This may reflect a deliberate inventory build ahead of expected demand or a slowdown in collections, which warrants monitoring.

Despite negative free cash flow in 2026Q2, OC continued to return capital to shareholders, with combined dividends and buybacks of $357M exceeding operating cash flow of $244M. This suggests that management is committed to returning capital, but it may be funded by debt or existing cash reserves, which could strain the balance sheet if the negative cash flow persists. The buyback activity has been relatively consistent, with quarterly repurchases ranging from $22M to $232M, indicating a ongoing program. Investors should monitor whether this pace is sustainable given the volatile cash generation.