BofA AI Bubble Warning Hits Dot-Com Level: Can Bitcoin at $84K Hold? In Crypto News today, the BofA AI bubble warning gained traction on September 27, 2026, after ZeroHedge shared new data fr
In Crypto News today, the BofA AI bubble warning gained traction on September 27, 2026, after ZeroHedge shared new data from Bank of America strategist Michael Hartnett.
The AI Big 10 share of US market cap now stands at 41%, matching the 2000 dot-com peak. Bitcoin traded near $84,300 on CoinGecko at last check.
This crypto news links equity stress to the crypto market.
Hartnett defines that group as the Magnificent 7 plus Broadcom, AMD and Micron.
According toZeroHedge's post on X, this group makes up 41% of US market cap, the level where earlier major bubbles peaked. ZeroHedge also covered this news in that post.
The figures come fromBofA Global Research. This market bubble warning rests on AI stocks concentration, not on a price forecast.
BofA compares three past episodes, each ended by a bond yield surge:
Episode
Year
Yield jump
Nifty Fifty
1973
2.0 points (US)
Japan
1989
2.3 points (Japan)
Dot-com
2000
2.6 points (US)
In all three, the end came once rose 2 points or more. Market concentration at 41% is the marker Hartnett highlights today.
"Quickest way to end US boom is surge in bond yields," BofA writes. That is how bond burst a bubble: higher Treasury lift borrowing costs and can pull money away from risk assets.
Federal Reserve data on FRED shows the 10-year Treasury yield at 5.18% on September 24, 2026, up from 4.96% on September 22 and 5.11% on September 23.
The BofA comparison puts that about 1.27 points above February, leaving roughly 0.73 points before the 2-point mark.
Tracking the 10-year Treasury yield and AI stocks together shows whether the link between bond yields and stock market bubble endings is tightening.
The BofA AI bubble warning rests on exactly that link.
The AI bubble Bitcoin link is indirect. Bitcoin sits outside the AI Big 10, yet it may still react if Treasury yields keep rising and investors trim risk assets. The AI bubble bond yields debate therefore matters beyond stocks.
Indicator
Reading
Source
Bitcoin price
~$84,300
CoinGecko
US 10-year yield
5.18% (Sept 24)
Federal Reserve
Index weight
41%
BofA
Past yield jump
2.0 to 2.6 points
BofA
One metric to watch is the Bitcoin and Nasdaq correlation AI stocks may be shaping, since a tighter link would raise Bitcoin's sensitivity to equity selloffs. The BofA AI bubble warning could matter for crypto if that link strengthens.
Analysts suggest tracking three signals:
Treasury yields moving toward the 2-point mark
Any easing in market concentration
Bitcoin's reaction during equity volatility
The AI bubble warning from Bank of America is a risk flag, not a timing call. The BofA AI bubble warning does not say a crash is certain, and markets could stay stretched for months.
Yields have already moved quickly this week, so the next few daily FRED readings will matter for both stocks and crypto.
Disclaimer: This article is for information only and is not investment advice. Crypto and stock prices are volatile.
