Bank of America Securities said in a report dated Oct. 6, 2026 that the S&P 500 and the Nasdaq have remained resilient despite a sharp rise in bond yields, even as market breadth sits near historic lows. The bank said the current advance has been led by mega-cap technology stocks and fear of missing out on artificial intelligence, and that narrow breadth is a classic feature of bubble formation that usually persists until the bubble breaks.
BofA said enthusiasm for technology is overwhelming macro and policy uncertainty. Investors unwilling to participate in the narrow AI-led rally risk lagging behind, according to the report. The bank’s position is that bubble-like pricing in the AI trade can continue to push through macro pressure for now.
Tech stocks show an asymmetric response to yields
BofA pointed to last Friday’s softer nonfarm payrolls data, which pushed yields lower and helped equities rise. The Nasdaq still finished higher even after yields fully retraced their move. By the bank’s estimate, tech stocks react asymmetrically to the 10-year Treasury yield: gains when yields fall are about three times larger than losses when yields rise.
Over the past month, the Nasdaq has gained about 6% while the 10-year yield has risen by roughly 50 basis points. BofA said that pattern points to bubble dynamics embedded in the AI trade. Other sectors remain more rate-sensitive, and that divergence is adding to dispersion across the market.
The report also said realized volatility on up days in the S&P 500 and the Nasdaq has been well above realized volatility on down days. In BofA’s view, right-tail risk remains the main risk in U.S. equities, especially in technology shares.
Structured product issuance keeps rising as dealer hedging nears peak levels
BofA said issuance of structured products continues to grow. In North America, third-quarter issuance was running at an annualized $35 billion and could set another record. Index-linked products remained the main driver, with about $6.5 billion tied to SPX and about $5 billion tied to RTY in the third quarter. Among single stocks, Nvidia led by a wide margin, with more than $8 billion issued so far this year.
The bank said SPX, NDX, RTY and SX5E are all close to the Vanna peak of outstanding structured products, leaving dealer hedging flows near their strongest levels. It said the effect is most visible in semiconductors and U.S. technology single names.
The impact differs by benchmark. BofA said SPX market depth dilutes the effect, with structured-product-related flow equal to only about 6% of average daily listed Vega volume. NDX rises to about 36%, while RTY exceeds a full day at 185%. Among the main benchmarks, BofA said NDX and RTY show the strongest autocall effect.
Volatility calendar trades still have support
BofA said long-dated volatility is shaped by structural dealer supply, while the short end of the market remains vulnerable to positioning-driven dislocations. That mix supports volatility calendar trades, using short exposure to long-dated volatility to fund short-term long Gamma positions.
On implementation, the bank recommended buying a QQQ November 775/825 call spread at an indicative price of $11.63, with a maximum payout ratio of about 4.3x. It said part of the cost can be funded with out-of-the-money puts, and that selling 15-delta puts could cut the cost by about 50%.
BofA also outlined another approach: buying NDX call options in a scenario where rates are higher but the market remains range-bound. The bank said that kind of high-equity, high-rate setup offers cheaper upside exposure while keeping risk limited.
Bubble Risk Indicator points to caution, but not a full exit
BofA’s Bubble Risk Indicator, or BRI, shows the highest readings in U.S. technology stocks. Semiconductors 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 have the highest BRI readings among S&P 500 constituents. BofA compared the current setup with the late-1990s internet bubble and said today’s bubble is still localized. Back then, 50 to 100 S&P constituents had BRI readings above 0.8, representing 20% to 40% of market capitalization. Now, the number is about 15 stocks, accounting for roughly 2% of market value.
Across historical bubble episodes, stocks with BRI above 0.8 posted a worse median maximum drawdown over the following three months than stocks with BRI below 0.8. BofA said a BRI reading above 0.8 usually signals asymmetric downside risk in the near term. Still, the bank added that fully stepping away before the bubble breaks can lead to underperformance. In its view, BRI is better used to add protection or rotate out of specific stocks.
BofA keeps a bullish tech stance through limited-risk structures
BofA said it continues to favor upside exposure in technology, but through structures with limited risk. Its recommendations include the QQQ November 775/825 call spread, partly funded with puts, and NDX call options in a higher-rate but range-bound market.
The bank also said NDX and RTY, where the autocall effect is strongest, are better suited to trades that sell long-dated volatility to fund short-term long Gamma. Right-tail risk in U.S. equities remains in place, and the bank said that is especially true for technology stocks.
The core message of the report is straightforward: low market breadth is a feature of bubble formation, and BofA expects that feature to persist until the bubble finally breaks.
This article is a整理 and interpretation of a third-party broker report from Bank of America Securities dated Oct. 6, 2026, combined with public market information. The cited ratings, target prices, earnings forecasts and related judgments are the views of the broker’s analysts and represent only the position of their institution. They do not constitute investment advice. Markets carry risk, and investment decisions should be made independently. This article should not be used as the basis for buying or selling any security.