Bitcoin miners fall while BTC jumps as AI contracts change stock dynamics

Bitcoin rally leaves miner stocks behind

Bitcoin rose 21.5% from August 17 to August 21, climbing from about $64,486 to $78,332. During that same period, six of seven major US-listed Bitcoin mining companies posted lower stock prices.

MARA Holdings was the only large miner to gain, rising 16.1%, which came closest to tracking the cryptocurrency's move. The rest fell: Cipher Digital dropped 14.8%, TeraWulf lost 11.2%, Hut 8 declined 8.1%, IREN fell 6.8%, Riot Platforms slipped 1.3%, and CleanSpark dropped 3.4%.

The split happened while Bitcoin had one of its strongest weeks of the year. It shows the old connection between Bitcoin prices and miner stocks is weakening as these companies shift toward AI and data-center contracts.

Key numbers from the separation

• Bitcoin gained 21.47% in five trading days (Aug 17–21).
• MARA rose 16.07%; all other major miners fell.
• The QQQ index, which tracks major US tech stocks, fell 2.27% during the same stretch.
• In recent 90-day windows, QQQ correlation exceeded Bitcoin correlation for all seven analyzed miners.
• TeraWulf earned 71% of its second-quarter revenue from high-performance-computing leases.
• IREN reported $70.5 million in AI cloud revenue versus $66.7 million from Bitcoin mining in its June quarter.
• Hut 8 has $26.6 billion in base-term contract value across 949 megawatts of contracted IT capacity.

How the pivot is changing the business model

Traditional Bitcoin mining uses specialized computers to convert electricity into Bitcoin. A miner's profits depend on the coin's price, network difficulty, transaction fees, how efficient its machines are, and how much it pays for power.

Many of these companies now use the same electricity, land, and grid connections to run GPU clusters for AI and data-center work instead of Bitcoin mining hardware. Public markets price those two uses with different risks and expectations.

Instead of relying on volatile mining income, some miners are signing long-term contracts with technology tenants. These contracts provide more predictable revenue backed by corporate credit rather than Bitcoin price swings. That shift changes how investors value the stocks.

Where each miner stands

TeraWulf has moved furthest into the new model. High-performance computing leases made up about $31.9 million of its $44.8 million second-quarter revenue, with roughly $12.8 million coming from digital assets.

IREN reported operating annual recurring revenue of $1 billion as of August 26, with contracted annual recurring revenue tied to 2026 capacity at $4 billion. The company targets making that contracted capacity operational by December 31, subject to testing and customer acceptance. Its June quarter also included a $450.4 million impairment tied to decommissioned mining hardware being converted for AI use.

Hut 8 says its Beacon Point leases cover 949 megawatts of contracted IT capacity with $26.6 billion in base-term contract value, though those figures depend on future delivery and tenant performance.

Cipher still recorded mining revenue in its second quarter but has contracted 700 megawatts of high-performance-computing capacity across three sites and began delivering the first capacity at its Black Pearl site in August. Investors can model contracted computing capacity and an estimated $793 million in average annual net operating income based on base lease terms.

Riot Platforms reported $113.7 million in mining revenue, $23.2 million from data centers, and $37.3 million from engineering in a $174.2 million quarter. It has 241 megawatts of contracted AI capacity carrying roughly $9.8 billion in estimated long-term revenue, alongside 11,380 Bitcoin held at June 30.

CleanSpark signed a 20-year, $6.6 billion data-center lease on August 6 while its operating revenue still came from mining, placing it in the newly hybrid group.

MARA remains the closest large mining-led comparator. It continues to rely heavily on mining economics while exploring adjacent energy and computing businesses.

What the data shows on correlations

CryptoSlate analyzed daily closing prices for eight assets: Bitcoin, MARA, RIOT, CLSK, IREN, HUT, WULF, CIFR, and QQQ, from August 22, 2024 through August 24, 2026. The analysis compared rolling 90-day correlations and Bitcoin betas between two windows ending in August 2025 and August 2026.

A Bitcoin beta measures how much a miner's stock tends to move when Bitcoin moves. A beta above 1 means the stock moves more than Bitcoin; a beta below 1 means it moves less. Correlation measures how consistently their price directions traveled together.

Bitcoin beta declined for six of the seven companies compared with the August 2025 window. IREN's beta stayed near 0.93. Bitcoin correlation fell for six companies and rose slightly for WULF, from 0.17 to 0.22.

QQQ correlation exceeded Bitcoin correlation for all seven companies in the current window. Their daily stock returns tracked the Nasdaq tech proxy more consistently than the coin they mine. MARA retained the group's highest Bitcoin correlation and beta, matching its heavier dependence on mining economics.

A three-factor model that included Bitcoin returns, QQQ returns, and 10-year Treasury yield changes explained roughly 28% to 45% of daily variation across the seven miners in 2026 year-to-date. The estimated effect of a 10-basis-point yield increase ranged from a 0.52% decline for WULF to a 0.79% gain for CIFR. Four rate coefficients were negative and three were positive, so the sample does not support a common bond-like trade across the group.

Why this matters for investors

The August price separation captures a real shift in how these companies are valued. Mining cash flow still funds or supports several AI buildouts, and every company retained a positive Bitcoin beta, meaning mining price sensitivity has not disappeared entirely.

Bitcoin has become one factor among several, with its weight lowest where contracted computing capacity has become the main investment case. The term "Bitcoin miners" now describes these companies' origins more reliably than their current business direction.

Investors buying these stocks receive exposure to Bitcoin production, hyperscaler credit, construction schedules, power-delivery risk, project finance, and technology-equity multiples in different proportions depending on the company. Contract announcements carry uncertainty because base-term values represent payments expected across many years, revenue estimates depend on timely delivery, and project-level debt protects a parent balance sheet only within specific terms.

What is confirmed

• Bitcoin rose 21.5% from August 17 to August 21.
• Six of seven major US-listed miners finished that period lower.
• QQQ correlation now exceeds Bitcoin correlation for the analyzed miners.
• Several companies have reported significant data-center or AI revenue and contracted capacity.

What is still unclear

• When contracted AI capacity will convert to realized revenue for companies early in the buildout phase.
• How tenant performance and construction schedules will affect projected contract values.
• Whether the weakening Bitcoin correlation will persist as AI projects reach completion.

Sources

• CryptoSlate