CleanSpark, Inc. (CLSK) — Fundamental Analysis

CleanSpark has undergone a dramatic transformation over the past several years, growing from a tiny energy-software startup into one of the larger publicly traded Bitcoin miners in the United States. Revenue surged from roughly $10 million in fiscal 2020 to over $766 million in fiscal 2025 — a pace of growth that few companies at any scale can match. More importantly, fiscal 2025 marked a genuine inflection point: after years of heavy losses, CleanSpark swung to meaningful profitability, posting an operating margin above 40% and a net margin near 48%. The balance sheet is in solid shape, with a current ratio above 4x and debt-to-equity below 0.30. Capital spending remains significant, as you'd expect from a company still aggressively expanding its mining fleet, but it has moderated as a share of revenue. The big remaining question is sustainability — Bitcoin mining profitability is tightly tied to BTC price and network difficulty, both of which can shift fast. The underlying business momentum is real, but so is the macro-level volatility inherent to the industry.

Snapshot & Big Picture

CleanSpark, Inc. (Nasdaq: CLSK) is a Bitcoin mining company focused on building and operating large-scale, low-carbon mining facilities primarily across the southern United States. The company's fiscal year ends September 30. Over the past decade, CleanSpark has reinvented itself — pivoting away from energy software into pure-play Bitcoin mining — and has scaled aggressively through both organic expansion and acquisitions of mining sites.

The fiscal 2025 numbers represent a stark contrast to every prior year in the dataset. Revenue more than doubled year-over-year from $379M to $766M, and the company flipped from deep operating losses to strong operating income. This reflects both a favorable Bitcoin price environment during the period and the benefits of scale as CleanSpark's hashrate capacity has expanded substantially.

Latest Quarter Snapshot

Quarterly data from the most recent 10-Q was not available in the data provided for this analysis. The most recent filings on record are the 10-Qs for the quarters ending March 31, 2026 and June 30, 2026, both filed in 2026. Readers seeking the most current intra-year figures — which would be more recent than the fiscal 2025 annual data — should refer directly to those filings linked in the Source Filings section below. Given that fiscal 2025 already ended September 30, 2025, those 2026 quarterly filings represent CleanSpark's fiscal 2026 progress and are the freshest available window into current operating conditions.

Profitability

The profitability story at CleanSpark is one of prolonged loss-making followed by a sharp, potentially transformative turn in fiscal 2025. For the better part of six years — fiscal 2019 through fiscal 2024 — the company posted negative operating and net margins in virtually every period, often deeply so. Operating losses were especially wide in fiscal 2023 (-77.8%) as Bitcoin prices remained depressed in the wake of the 2022 crypto bear market, and investment in expansion continued regardless.

The fiscal 2024 picture (-39.3% operating margin) reflected continued heavy investment spending and the drag from the April 2024 Bitcoin halving, which cut block rewards in half and compressed per-coin mining economics industry-wide. Then fiscal 2025 delivered a sharp reversal: operating margin of approximately 41.6% and net margin of approximately 47.6% — the company's first strongly profitable annual period on record. EBITDA swung from a near-zero $5.6M in fiscal 2024 to $667.3M in fiscal 2025. The net margin exceeding the operating margin suggests meaningful non-operating income or fair-value gains on Bitcoin holdings, which is worth monitoring since those components can be volatile.

Gross margin data was not available in the filings for most recent years (fiscal 2021 onward), so the margin analysis relies on operating and net margin figures.

Financial Health & Capital Expenditures

CleanSpark's balance sheet has strengthened considerably. The current ratio climbed from a concerning 1.38x in fiscal 2023 to 3.75x in fiscal 2024 and 4.18x in fiscal 2025 — indicating the company now holds very comfortable near-term liquidity. Debt-to-equity rose from near zero (0.004x in fiscal 2024) to 0.30x in fiscal 2025, which is still modest and suggests the company took on some additional debt to fund expansion while maintaining a conservative leverage profile overall.

Capital expenditures are a central feature of CleanSpark's model — miners must continually invest in new ASIC hardware and facility build-outs to stay competitive as network difficulty rises. Here's how capex has trended:

The capex intensity spike in fiscal 2023 (36.5% of revenue) reflected aggressive fleet expansion during a period of low Bitcoin prices — a high-conviction bet that paid off as BTC prices recovered. Since then, capex as a share of revenue has moderated to roughly 17–19%, even as absolute dollar spending has risen sharply. In fiscal 2025, the company spent $144.7M on capital investments — more than double the prior year in dollar terms — while the revenue base expanded fast enough to keep the ratio roughly stable. This pattern is consistent with a scaling industrial business that continues to reinvest heavily but is no longer spending at a loss-generating pace. Quarterly capex data was not available for this analysis.

Growth

CleanSpark's revenue growth rates over multi-year windows are extraordinary, though they reflect both genuine operational scaling and the mathematical effect of starting from a very small base.

Even the 3-year CAGR of ~80% — which starts from a meaningful revenue base of $131.5M — reflects genuinely rapid scaling. The 5- and 10-year figures (138% and 253% respectively) are extraordinary in magnitude but are heavily influenced by the near-zero starting points in fiscal 2020 and fiscal 2014, so they should be interpreted more as illustrations of the company's complete reinvention than as forward-looking growth benchmarks. The trajectory that matters most for investors is whether the company can sustain growth from its current $766M revenue base — which will depend far more on Bitcoin economics and hashrate efficiency than on the base-effect-driven CAGRs of the past.

Source Filings

• 10-Q filed August 6, 2026 — Quarter ending June 30, 2026
• 10-Q filed May 11, 2026 — Quarter ending March 31, 2026