The four largest publicly traded Bitcoin miners — MARA Holdings, Core Scientific, Riot Platforms, and IREN — reported combined net losses exceeding $2.5 billion in their most recent quarters, driven by post-halving margin compression, declining Bitcoin prices, and non-cash impairments on mining a...
"We are no longer a bitcoin mining company. We are a digital infrastructure company that happens to mine bitcoin." — Daniel Roberts, CEO of IREN, Q2 FY2026 Earnings Call
The four largest publicly traded Bitcoin miners — MARA Holdings, Core Scientific, Riot Platforms, and IREN — reported combined net losses exceeding $2.5 billion in their most recent quarters, driven by post-halving margin compression, declining Bitcoin prices, and non-cash impairments on mining assets. Hashprice, the industry's core revenue metric, has fallen to approximately $31.66 per PH/s per day as of August 7, 2026 — levels not seen since the 2020 COVID crash. The weighted average cash cost to produce one Bitcoin among public miners reached $79,995 in Q4 2025, according to CoinShares, while the all-in cost now ranges from $38,000 to $92,000 depending on electricity rates and hardware generation.
Simultaneously, these same companies have secured more than $70 billion in cumulative AI and high-performance computing (HPC) contracts. Core Scientific's Q2 revenue doubled year-over-year to $164.2 million, with AI colocation generating $136.7 million — twelve times the $10.6 million it earned from AI a year earlier. IREN signed a $9.7 billion, five-year GPU services agreement with Microsoft. Riot Platforms generated its first meaningful data center revenue of $33.2 million and doubled its AMD lease to 50 MW. CoinShares projects that up to 70% of mining companies' revenue may come from AI by end of 2026.
The Bitcoin mining industry is undergoing a structural transformation. The 2024 halving, which cut block rewards from 6.25 BTC to 3.125 BTC, has accelerated what was already a trend: repurposing energy infrastructure and cooling capabilities built for proof-of-work mining into higher-margin AI compute hosting.
The April 2024 halving cut Bitcoin's block subsidy from 6.25 BTC to 3.125 BTC, immediately doubling the cost basis per coin for every miner on the network. The impact was predictable in direction but more severe in magnitude than most operators anticipated.
According to CoinShares' Q1 2026 mining report, the weighted average cash cost to produce one Bitcoin among publicly listed miners rose to approximately $79,995 in Q4 2025, up from roughly $16,800 pre-halving. Average production cost per coin, including depreciation and overhead, now sits at $37,856 for efficient operators — and significantly higher for those running mid-generation hardware.
Hashprice, the revenue a miner earns per unit of computational power, has compressed to approximately $31.66 per PH/s per day as of August 7, 2026. This is down from roughly $0.12 per TH/s per day in early 2024. At current levels, an estimated 15-20% of mining rigs globally are operating at a cash loss. Miners running mid-generation hardware need access to sub-$0.05/kWh electricity to remain cash-profitable. Only operators with latest-generation fleets (sub-15 J/TH efficiency) retain meaningful margins at typical industrial electricity rates.
The break-even electricity rate for the Antminer S21 XP (270 TH/s, 13.5 J/TH), considered among the most efficient machines on the market, sits at approximately $0.12-0.15/kWh at current BTC prices. Less efficient hardware requires rates well below $0.08/kWh to clear any margin at all.
The Q2 2026 earnings season, reported in late July and early August 2026, painted a stark picture across the four largest public mining companies.
MARA Holdings reported Q2 revenue of $174.9 million, down 27% year-over-year. Net loss widened to $611.3 million. Adjusted EBITDA swung to a negative $360.9 million. Management attributed a $65.9 million revenue reduction to lower average Bitcoin prices during the quarter. The company posted an unrealized loss of $343 million on its digital holdings. Despite the financial deterioration, Bitcoin production rose 3% to 2,422 BTC as energized hashrate climbed to 70.3 EH/s, up 22% year-over-year. MARA's BTC treasury declined 29% to 35,577 BTC. The company presented a "Digital Infrastructure Triad" strategy encompassing AI, power generation, and critical IT infrastructure.
Core Scientific reported Q2 revenue of $164.2 million, more than double the $78.6 million posted in Q2 2025 and well ahead of analyst estimates of $135 million. However, the company recorded a net loss of $1.155 billion, almost entirely non-cash — driven by write-downs of mining assets and depreciation on new construction. AI colocation revenue surged to $136.7 million, twelve times the $10.6 million earned from AI a year earlier. Bitcoin mining is now a minority revenue stream for Core Scientific.
IREN reported Q2 revenue of $184.7 million with a net loss of $155.4 million, reflecting mining-related impairments and heavy build-out costs. Bitcoin mining revenue fell to $111.2 million while AI Cloud Services revenue surged to $33.6 million from $3.6 million a year earlier — a 9x increase. The company holds zero Bitcoin in treasury by deliberate choice, differentiating itself from peers that maintain BTC balance sheets.
Riot Platforms reported Q1 2026 revenue of $167.2 million, up 3.6% year-over-year, with a net loss of $500.5 million — widening 69% from the same quarter the prior year. The company generated its first meaningful data center income of $33.2 million through an expanded AMD lease at its Rockdale, Texas facility. Riot's Q2 results, reported August 5, continued the same trajectory of mining revenue pressure alongside growing AI infrastructure revenue.
Combined, these four companies posted net losses exceeding $2.5 billion in their most recently reported quarters.
The financial distress in mining has coincided with — and accelerated — a large-scale reallocation of capital toward AI and HPC infrastructure. According to CoinShares, the public mining sector has announced more than $70 billion in cumulative AI and HPC contracts as of Q1 2026.
Core Scientific leads in contracted value. Its existing 590 MW contract with CoreWeave, originally signed in 2024 and expanded multiple times, projects $10.2 billion in revenue over 12 years. In July 2026, Core Scientific signed an additional deal with AMD valued at $14 billion. Total contracted revenue across both partnerships: approximately $24 billion, with an option for AMD to scale to 2.5 GW of additional capacity. The company holds $1.8 billion in liquidity to fund the build-out.
IREN has positioned most aggressively. The company secured a $9.7 billion, five-year GPU services agreement with Microsoft, projecting $1.94 billion in annualized revenue at an 85% project-level EBITDA margin. IREN is already operating 23,000 GPUs — more than any peer. In addition, NVIDIA backed IREN with a $3.4 billion AI cloud deal and a $2.1 billion equity stake. IREN closed $3.65 billion in GPU-backed financing at sub-6% interest rates. The company targets $3.4 billion in annualized revenue run rate by end of 2026, supported by a new 1.6 GW Oklahoma campus bringing total secured grid-connected power to over 4.5 GW.
Riot Platforms doubled its AMD colocation lease at Rockdale to 50 MW. In May 2026, Riot's stock surged 57% after announcing a partnership with Terrestrial Energy to explore nuclear-powered AI data centers using molten salt reactors, targeting up to 4 GW of small modular nuclear capacity. Activist investor Starboard Value publicly valued Riot's AI pivot potential at up to $21 billion, compared to the company's market capitalization of approximately $6.3 billion.
MARA Holdings has been slower to pivot but introduced its "Digital Infrastructure Triad" strategy in Q2 2026, targeting AI, power generation, and critical IT infrastructure as new business lines.
A structural paradox defines Bitcoin mining in 2026: the network has never been more secure, yet miners have rarely been less profitable.
Bitcoin's network hashrate sits at approximately 919.7 EH/s as of August 7, 2026 — within striking distance of the 1 ZH/s (1,000 EH/s) threshold it briefly crossed in 2025. Network difficulty stands at 126.23 T. Despite revenue per unit of hashpower falling to multi-year lows, hashrate has not materially declined because:
The result is a ratchet effect: hashrate climbs, difficulty adjusts upward, and marginal miners are squeezed further. The purge has been concentrated among operators running mid-generation hardware (20-30 J/TH efficiency range) at electricity costs above $0.06/kWh.
The core thesis behind the mining-to-AI pivot rests on an infrastructure arbitrage: Bitcoin miners built large-scale facilities with high-density power connections, industrial cooling systems, and low-latency network access — precisely what AI workloads require.
However, the economics are structurally different:
| Metric | Bitcoin Mining | AI/HPC Colocation | |--------|---------------|-------------------| | Revenue model | Variable (BTC price × hashrate) | Fixed (multi-year lease contracts) | | Margin profile | 30-50% gross, volatile | 70-85% EBITDA, contractual | | Capital intensity | Moderate (ASICs depreciate 2-3 years) | Very high (GPU clusters, cooling, networking) | | Counterparty risk | None (permissionless network) | Concentrated (Microsoft, AMD, CoreWeave) | | Revenue visibility | None (spot market) | 5-12 year contracted |
Core Scientific and IREN have emerged as the clearest winners. Core Scientific's AI colocation now constitutes 83% of total revenue. IREN's zero-BTC-treasury approach eliminates impairment risk and signals full commitment to the infrastructure model.
MARA and Riot remain in transition. MARA still holds a $3+ billion BTC treasury, exposing it to mark-to-market volatility that contributed to $343 million in unrealized losses in Q2 alone. Riot's AI revenue is growing but remains a fraction of total output.
Counterparty concentration. The AI pivot trades network-level risk (Bitcoin protocol) for counterparty risk (hyperscaler contracts). Core Scientific's revenue depends heavily on CoreWeave and AMD. IREN's projections rest on Microsoft. Contract cancellation or renegotiation would materially impair projected cash flows.
Execution risk. Operating GPU clusters for AI workloads requires different expertise than running ASIC farms. Power delivery, cooling density, networking, and uptime SLAs for AI customers are more demanding. Not all miners can make this transition successfully.
AI infrastructure oversupply. Multiple industries — from traditional data center operators (Equinix, Digital Realty) to telecom companies — are expanding AI hosting capacity simultaneously. If AI compute demand growth slows or supply saturates, the premium margins miners are projecting may not materialize.
Bitcoin network security implications. If profitable miners continue reallocating capacity toward AI, the Bitcoin network's security model depends increasingly on a smaller set of operators. The network's hashrate has remained stable, but the composition of who provides it is shifting toward fewer, larger entities.
The 2028 halving. The next halving, expected in 2028, will reduce the block subsidy to 1.5625 BTC. At current hashprice trends, pure-play Bitcoin mining may become economically unviable for all but the most efficient operators, unless BTC prices appreciate significantly or transaction fee revenue rises substantially.
The Bitcoin mining industry's transformation from proof-of-work specialists into diversified digital infrastructure operators is the most significant structural shift in the sector since the advent of industrial-scale mining. The data from Q2 2026 earnings makes the economic logic clear: at current hashprices, pure-play Bitcoin mining generates losses; AI/HPC colocation generates contracted, high-margin revenue.
The speed of this transition is notable. Two years ago, AI revenue for public miners was effectively zero. By Q2 2026, it constitutes the majority of revenue for the industry's largest operator. The $70 billion in contracted AI revenue dwarfs the approximately $17 billion in total Bitcoin mining industry revenue generated in 2025.
Whether this pivot represents a durable business model transformation or a cyclical arbitrage depends on variables outside miners' control: AI compute demand growth, hyperscaler capital expenditure cycles, and competing supply from traditional data center operators. What the data shows clearly is that the economics of Bitcoin mining alone no longer support the capital structures these companies have built. The infrastructure they constructed to secure the Bitcoin network is being repurposed to train and deploy AI models — a transition that says as much about the current state of AI demand as it does about the post-halving economics of proof-of-work.