BofA Warns: Bond Market Turmoil and Financial Stock Selloff Raise Risk of Sharp Shock for US Stocks

US Treasury yields continued to climb this week, driven by stronger-than-expected economic data, elevated government debt, and rising energy prices that have intensified inflation concerns. These factors have strengthened market expectations that the Federal Reserve may raise interest rates at its October meeting. According to the CME FedWatch Tool, the probability of a rate hike next month now exceeds 60%.

Bank of America warned that mounting panic in the bond market, combined with a sell-off in financial stocks, is escalating the risk of a severe market shock as conditions continue to deteriorate.

Bond Market Panic

For years, market participants have widely viewed the 10-year US Treasury yield reaching 5% as a critical threshold that would trigger turbulence in global financial markets.

Paul Jackson, Global Head of Asset Allocation Research at Invesco, noted that investors are closely watching Treasury yields for a simple reason: US Treasuries serve as the global benchmark for risk-free assets. Once yields break above 5%, investors can lock in the highest returns on Treasuries since 2007. Jackson's calculations show that when the 12-month average of the 10-year yield reaches 4.72% and continues to rise, global stock markets begin to decline. While the current 12-month average stands at approximately 4.34%—still below that threshold—Jackson said he has already begun reducing stock holdings and shifting capital into bonds to capture attractive yields.

However, this threshold now appears less like a ceiling and more like a waypoint. Mike Bell, Market Strategy Head at BlueBay Asset Management, stated that 5% has always been a psychological barrier rather than an automatic trigger. "People tend to think there is a magic number for Treasury yields that, once breached, will cause a crisis. But yields are relative indicators, not absolute numbers," Bell explained.

What truly matters, Bell said, is the relationship between Treasury yields and other core investment metrics, particularly the earnings yield on stocks. This ratio is now approaching an inflection point that could set the stage for a stock market sell-off. History offers some guidance: the last time the 10-year yield broke above 5%, the MSCI World Index was cut in half, followed by the global financial crisis. Going further back, the 10-year yield surged to nearly 6.8%, puncturing the dot-com bubble and sending stock indices sharply lower.

JPMorgan believes the current market stress threshold has moved above 5%, partly due to a "structural shift" in the global economy, with increased weight in sectors such as artificial intelligence, healthcare, and services. Many companies in these sectors continue to invest and expand regardless of financing costs. Citing views from major investors at a recent conference, JPMorgan noted that this means "the traditional interest rate transmission channel has become significantly less binding," potentially raising the stock market's "breakage threshold" to the 5.5%–6.0% range.

The $29 trillion US Treasury market underpins virtually all financial asset pricing. A rapid rise in yields from 5% would signal a deep adjustment in global capital costs. If yields reach 6%, it could imply significantly higher inflation expectations, growing concerns over US fiscal sustainability, market conviction that rates will remain elevated for years—or a combination of all three.

In its Friday Flow Watch report, a team of Bank of America analysts led by Michael Hartnett noted that the MOVE index, which measures expected volatility in the Treasury market, surged 33% in just the past two days. Similar to the VIX "fear index" in equities, the MOVE index tends to spike when Treasury markets come under pressure.

Hartnett said that rising volatility in this global funding benchmark is bad news for all markets. If this trend continues alongside a sharp decline in the iShares Global Financials ETF (IXG), markets will face significant risk. He warned that if IXG falls below $125 and the MOVE index rises above 125, a risk-off deleveraging event could be imminent. However, such an event would likely trigger panic intervention by policymakers to lower oil prices and Treasury yields. "Only when policymakers start to panic will market panic stop," Hartnett said. Any intervention aimed at lowering oil prices and yields would be negative for the US dollar index and positive for commodities and emerging market assets.

Bank Stocks Under Pressure

Over the past few weeks, bank stocks have faced a double blow. First, executives at major banks—including Bank of America's Brian Moynihan—warned of declining investment banking revenue and largely flat trading income. Then, the Fed's rate hike cycle began.

The Financial Select Sector SPDR Fund (XLF) has fallen nearly 6% from its recent high. The sector began weakening on September 4, the day stronger-than-expected August employment data was released. Since then, the bond market has priced in a higher likelihood of a Fed rate hike. Over the past three years, the financial sector's performance has been closely tied to changes in the yield curve. Data on the spread between the 5-year and 2-year Treasury yields shows that financial stock prices have long moved in tandem with yield curve shifts.

If the Fed continues to raise rates in the coming months, financial stocks could face a prolonged difficult period. Under the current rate hike cycle, higher interest rates combined with a flattening yield curve have pressured bank stocks while creating risks for the broader equity market. Although market attention is focused on the 10-year and 30-year yields, the truly critical changes are occurring at the short end of the yield curve—specifically, the spread between short- and long-term yields. The 2-year yield has risen even more than the 10-year yield. The spread has narrowed to just 21 basis points, down from over 70 basis points before the US-Iran conflict erupted. This significantly impacts financial stocks: rising rates drag on loan growth and increase banks' funding costs, while a flattening yield curve suppresses net interest income—all of which hurt bank profitability.

These effects extend beyond the stock market to the real economy. If lending becomes unprofitable, banks may tighten credit, leaving businesses with less capital for expansion and making it harder for consumers to borrow. Essentially, for the financial sector to stabilize, one of two conditions must be met: either the yield curve stops flattening, or economic data weakens significantly enough to force the Fed to pause rate hikes. However, with the Fed's rate hikes just beginning and inflation showing no signs of easing, a pause appears unlikely.

John Roque, Head of Technical Analysis at 22V Research, reviewed charts of the 10-year Treasury yield over the past 50 years and identified 16 instances of rapid yield increases similar to the current environment. In every case, some form of financial distress followed.

Roque believes the key area to watch this time is regional banks, as their stability is essential for the broader market to hold firm. The KBW Regional Banking Index (KRE) has fallen nearly 10% from its recent high, just shy of entering technical correction territory. Looking back at past crises triggered by rising rates, the banking sector has typically suffered the heaviest losses. "Regional banks in particular must remain resilient. Even if they decline, the drop cannot be too severe or evolve into a material risk," Roque said. "If regional banks continue to weaken and the weakness spreads to the entire banking sector, the stock market cannot stage a strong rally—absolutely not."