Concentration of AI stocks inside S&P 500 hits dot-com bubble peak – and Bitcoin miners are now exposed

A notable development has hit the crypto markets. The 10 largest AI stocks now make up about 41% of the S&P 500, according to a BofA Global Research chart circulated online . That puts the AI basket at the same concentration level that tech and telecom reached around the dot-com peak. The BofA chart put the Nifty Fifty at 40% in the 1970s and Japan at 44% in the late 1980s.

The comparison turns a stock-market concentration warning into a stress test for a corner of crypto that has spent the past year selling investors a new identity. The market concentration is the stress trigger. Miner disclosures and mining reports supply the exposure map.

Market Dynamics

Public Bitcoin miners increasingly trade as hybrid infrastructure companies with BTC exposure. Many have signed AI or high-performance computing contracts, raised capital for denser data centers, converted premium power sites, or shifted investor attention toward long-term lease economics. If the AI infrastructure premium fades, those companies face a different kind of pressure.

The risk moves from hashprice alone into debt, contract durability, construction execution, and equity multiples. At the same time, Bitcoin gets a second-order test. A weaker AI buildout could ease the scramble for power, rack space, interconnections, cooling equipment, and GPUs.

That would hurt miners whose new valuations depend on AI growth, while possibly helping remaining miners if scarce infrastructure becomes easier to secure. Related Reading Latest Bitcoin data proves BTC miners need price to retake $80k to stop lure of $4B in AI revenue Yet top 10 public miners could earn $4. 3B from BTC vs up to $4.

Market Impact

1B in long-term AI contracts, reshaping Bitcoin’s security base. Apr 18, 2026 Liam 'Akiba' Wright Miners Have Repriced Themselves Around AI The miner pivot is now measurable in revenue forecasts. A projected revenue mix cited by S&P Global Market Intelligence showed listed miners, including IREN, Riot Platforms, Core Scientific, HIVE, Cipher, and TeraWulf, shifting into AI and HPC workloads.

The projected revenue mix is already large enough to change how these companies are assessed. Visible Alpha expected HPC to account for 71% of 2026 revenue at IREN and Core Scientific, 70% at TeraWulf, 34% at Cipher, 15% at HIVE, and 13% at Riot. That spread shows the sector has split into cohorts.

Some miners are becoming data-center operators with Bitcoin exposure. Others are preserving mining as the core business while keeping AI optionality at sites that have power and grid access. The scale shows up in miner economics .

Crypto markets are watching this development closely as investors weigh its potential impact on prices.