CleanSpark, Inc. (CLSK) Cash Flow Statement

The gap between net income and operating cash flow is stark: in 2026Q3, net income was -$239.8M while operating cash flow was -$112.3M, implying large non-cash charges (D&A of $333.2M) and fair value losses. However, even after adding back D&A, operating cash flow remains negative, suggesting that the company's core mining operations are not generating cash. The persistent negative OCF across all quarters indicates that reported earnings, whether positive or negative, are not translating into cash generation, a critical red flag for sustainability.

The FCF trajectory is deteriorating: from -$60.3M in 2024Q2 to -$225.3M in 2026Q3, with a peak burn of -$835.8M in 2024Q4. This is driven by both negative operating cash flow and heavy capital expenditures, particularly in 2025Q4 and 2026Q3. The FCF margin has worsened from -54.0% to -163.3%, implying that for every dollar of revenue, the company is spending over $1.60 on operations and capex. This level of cash burn is unsustainable without external financing, and the company's ability to fund future growth is questionable.

The capex-to-revenue ratio has been highly volatile, peaking at 191.8% in 2025Q4 and 81.9% in 2026Q3, indicating a period of heavy expansion. However, the negative operating cash flow suggests that these investments are not yet generating sufficient returns. The company's high fixed-cost structure and reliance on external capital for growth are evident, and investors should monitor whether the new capacity will eventually produce positive cash flow. The recent EPS miss and negative gross margin in 2026Q3 suggest that the expansion may be poorly timed relative to Bitcoin price and network difficulty.

The working capital changes are consistently negative, with notable outflows in 2026Q1 (-$30.9M) and 2026Q3 (-$38.8M), suggesting that the company is tying up cash in inventory or other current assets. This is particularly concerning given the negative operating cash flow, as it implies that the company is not only failing to generate cash from operations but also using additional cash to fund working capital needs. The trend may indicate inefficiencies in inventory management or delays in collecting receivables, which could further strain liquidity.

The capital deployment strategy appears focused on expansion through acquisitions and infrastructure investments, with significant outflows for acquisitions in 2025Q2 and 2026Q2. The large buyback in 2026Q1 (-$460.0M) is notable, but it may have been funded by debt or equity issuance, given the negative operating cash flow. Dividends are minimal, indicating that shareholders are not receiving cash returns. The company's reliance on external financing to fund these activities is a concern, as it may lead to dilution or increased leverage if the investments do not generate adequate returns.

The cumulative gap between net income and operating cash flow is relatively small, suggesting that the company's losses are largely cash-based rather than accrual-based. However, the persistent negative operating cash flow across all quarters indicates that the business model is not self-sustaining. The company has consumed over $1.1B in operating cash flow over the past two and a half years, which has been funded by equity and debt issuance. This raises serious questions about the company's ability to achieve profitability and positive cash flow in the future, especially given the volatile Bitcoin price and increasing network difficulty.