Bank of America Securities said in an Oct. 6 report that unusually low market breadth remains a defining feature of the current U.S. equity rally, and that the pattern may persist until the bubble breaks. The bank said the move higher has been led by mega-cap technology stocks and fear of missing out tied to AI, even as Treasury yields surged.
The report, summarized in a piece written by Rita, said the S&P 500 and Nasdaq have held up despite the jump in bond yields, while breadth has fallen to historically low levels. BofA said optimism around technology is outweighing macro and policy uncertainty, and investors who stay out of the narrow AI-led advance risk underperforming.
Tech stocks show an asymmetric response to yields
BofA pointed to last Friday’s softer nonfarm payrolls data, which pushed yields lower and helped lift equities. The Nasdaq still closed higher even after yields had fully retraced their move.
According to the bank’s calculations, technology stocks respond asymmetrically to the 10-year Treasury yield. When yields fall, the upside in tech is about three times the downside seen when yields rise.
Over the past month, the Nasdaq gained about 6% while the 10-year yield rose by roughly 50 basis points. BofA said that pattern points to bubble-like dynamics inside the AI trade. Other sectors remain more rate-sensitive, and that divergence has pushed dispersion higher.
The bank also said realized volatility on up days in the S&P 500 and Nasdaq is far above realized volatility on down days. In its view, right-tail risk remains the main risk in U.S. equities, especially in technology.
Structured products and dealer hedging flows are near peak levels
BofA said issuance of structured products continues to grow. In North America, third-quarter issuance was running at about $35 billion on an annualized basis and could set another record.
Index-linked products remained the main driver. In the third quarter, issuance tied to SPX and RTY was about $6.5 billion and $5 billion, respectively. Among single stocks, Nvidia topped the list with more than $8 billion issued so far this year.
The report said SPX, NDX, RTY and SX5E are all close to the Vanna peak of outstanding structured products, which puts dealer hedging flows near their strongest levels. BofA said the effect is most visible in semiconductors and U.S. technology names.
The impact varies by index. In SPX, deeper market liquidity dilutes the effect, and structured-product-related flows amount to only about 6% of average daily listed Vega volume. In NDX, that figure rises to about 36%. In RTY, it exceeds a full trading day at 185%. BofA said NDX and RTY show the strongest autocallable effect among the main benchmarks.
Volatility calendar structures still have support
BofA said long-dated volatility is influenced by structural dealer supply, while the short end of the market remains vulnerable to positioning-driven dislocations. That mix, the bank said, supports volatility calendar strategies that fund short-term Gamma purchases with longer-dated short volatility exposure.
Among the trade ideas, BofA recommended buying the QQQ November 775/825 call spread at an indicative price of $11.63, with a maximum payout ratio of about 4.3x. The bank said part of the cost can be funded with out-of-the-money puts, and that selling 15-delta puts could reduce the cost by roughly 50%.
Another approach is to buy NDX calls in a scenario where rates are higher but the market remains range-bound. BofA said that kind of higher-rates, higher-equities setup offers cheaper upside exposure while keeping risk limited.
Bubble Risk Indicator flags elevated readings in tech
BofA also highlighted its Bubble Risk Indicator, or BRI, which shows the highest readings in U.S. technology stocks. Semiconductor shares have rebounded from a pullback in healthcare, and the technology sector’s BRI remains elevated.
At the single-stock level, MRNA, HPE, CRWD, ZBRA and RVTY posted the highest BRI readings among S&P 500 constituents.
The report compared the current setup with the late-1990s internet bubble and said the present episode is still localized. At that time, 50 to 100 S&P 500 members had BRI readings above 0.8, representing 20% to 40% of total market capitalization. Now the number is about 15, with a market-cap share of roughly 2%.
In historical bubble episodes, the median maximum drawdown over the following three months was worse when BRI was above 0.8 than when it was below that level. BofA said a BRI reading above 0.8 usually signals asymmetric downside risk in the near term. Still, fully exiting before a bubble breaks can lead to underperformance, so the bank said BRI may be more useful as a tool for adding protection or replacing stock exposure.
BofA keeps its upside positioning in tech
BofA said it continues to favor upside exposure in technology while expressing that view through limited-risk structures. Its listed positioning ideas include buying the QQQ November 775/825 call spread, partially funding the trade with puts, and buying NDX calls in a higher-rate but range-bound environment.
The bank also said NDX and RTY, where the autocallable effect is strongest, are suitable for structures that sell longer-dated volatility to fund short-term Gamma purchases. BofA’s conclusion was unchanged: right-tail risk remains present in U.S. equities, especially in technology, and low market breadth can continue until the bubble breaks.
This article is a summary and interpretation of a third-party broker research report from Bank of America Securities dated Oct. 6, 2026, combined with public market information. Any ratings, target prices, earnings forecasts and related judgments cited in the piece are the views of the broker’s analysts and represent the position of that institution, not the view of TechFlowPost or the compiler. It does not constitute investment advice.
The market carries risk, and investment decisions should be made independently. The article should not be used as the basis for buying or selling any security.