Bitcoin’s August rally created an odd sight: the coin jumped 21.5% from Aug. 17 to Aug. 21, but six of the seven large US listed miners ended that stretch lower. MARA Holdings rose 16.1% and came closest to Bitcoin. The rest lagged. Cipher Digital fell 14.8%, TeraWulf lost 11.2%, Hut 8 dropped 8.1% and IREN declined 6.8%. Over the same sessions, QQQ fell 2.3% while long-term Treasury yields stayed volatile. The group no longer moves like a simple Bitcoin proxy.
A changing revenue mix
The reason appears in quarterly filings. TeraWulf generated $31.9 million of its $44.8 million second-quarter revenue from high-performance-computing leases, with digital assets contributing about $12.8 million. IREN reported $70.5 million in AI cloud revenue and $66.7 million from Bitcoin mining. That put AI above mining in its current mix. Hut 8 says its Beacon Point leases cover 949 megawatts of contracted IT capacity, with $26.6 billion in base-term contract value, though delivery and tenant performance still matter. Riot remains closer to mining, with $113.7 million in mining revenue, but its contracted AI capacity carries an estimated $9.8 billion in long-term revenue. Cipher is earlier in the transition; its second quarter still leaned on mining, but 700 megawatts of contracted computing capacity gives investors a future stream to model.
Correlations now favor tech
CryptoSlate’s look at rolling 90-trading-day correlations, using Alpaca and Federal Reserve data, shows the shift clearly. Bitcoin beta fell for six miners in the window ending Aug. 24, 2026. Bitcoin correlation also declined for six, with only WULF nudging up from 0.17 to 0.22. QQQ correlation exceeded Bitcoin correlation for all seven. In plain terms, daily returns now track the Nasdaq more consistently than Bitcoin. MARA still leads the group in Bitcoin correlation, which makes sense given its mining exposure. IREN sits in a strange spot: its Bitcoin beta held near 0.93 while QQQ correlation reached 0.60.
Contracts add a second risk map
The contracts explain much of the separation, but they also complicate valuations. Multi-year revenue numbers are not guaranteed. Construction schedules, customer acceptance, project-level debt, power delivery and tenant credit all affect the final cash flow. A headline contract value can show direction, but it is not a substitute for completed capacity.
The August breakout captured a real shift. Every miner still has a positive Bitcoin beta, and mining cash flow still funds parts of the AI buildout. But Bitcoin is now one factor among several. For stocks like TeraWulf and IREN, the old label says more about their origin than their destination. Buying a basket of “Bitcoin miners” today means taking on Bitcoin production, hyperscaler credit, construction risk, power markets and technology equity multiples in different amounts. The beta is an output of the business mix, not a permanent trait.
