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Wall Street’s biggest banks entered the second half of 2026 with extraordinary momentum after one of their most profitable six month stretches in at least a decade. That powerful opening now faces a stiff challenge as interest rates surge and investors reassess the durability of the boom.

Third quarter earnings begin Tuesday with JPMorgan Chase, Goldman Sachs, and Citigroup, followed Wednesday by Bank of America and Morgan Stanley. Investors will be looking for evidence that sharply higher rates are starting to erode the trading, dealmaking, and financing strength that fueled standout second quarter results.

Analyst estimates compiled by Bloomberg point to lower profits than last quarter as revenue from those businesses retreats. Most of the five banks are still expected to report profit growth from a year earlier, while Bank of America and Morgan Stanley are expected to be the exceptions.

"Right now, you look out the window, and it feels okay. I think this is more about the risks than what's happening out the window," said Brendan Coughlin, president of regional lender Citizens Financial Group, which reports later next week.

Investors have already turned more cautious. The five banks collectively lost about $270 billion in market value from their respective summer highs through Friday’s close, even as the S&P 500 remained up roughly 14% for the year.

"A great deal of the recent underperformance for banks has been driven by the dramatic rise in long-term rates," UBS analyst Erika Najarian recently told clients. A Truist Securities survey found only 35% of institutional investors expected bank stocks to outperform the broader market, down from 68% in July and 82% in December.

The central question is not simply what higher borrowing costs will do to third quarter profits. Investors also want to know whether the rapid repricing of money will weaken the unusually strong financial activity that defined the first half of 2026.

Higher rates can initially increase the income banks earn from lending. They can also raise deposit and wholesale funding costs, pressure bond portfolios, and make the financial calculations behind corporate transactions more difficult.

The speed of the rate move is adding another layer of concern. Macquarie strategists noted that many prominent financial blowups during the past 50 years occurred shortly after abrupt movements in long term bond yields.

Trading results are expected to offer the clearest immediate evidence of any Wall Street slowdown. Bank executives warned in September that activity had softened, particularly in fixed income, compared with the frenzy that emerged during the spring.

Higher financing costs are also raising questions about whether this year’s investment banking surge can maintain momentum into 2027. Smart ring maker Oura and several other companies postponed plans to go public, citing market conditions.

Firmus Grid, which is backed by Nvidia, abruptly shelved its public listing plans after investors resisted its proposed valuation. The decision showed that even companies connected to artificial intelligence faced a higher capital hurdle, while global merger and acquisition announcements slowed sharply during the third quarter.

Despite that caution, Wall Street still sees substantial opportunity in financing the artificial intelligence buildout. The expansion could generate years of debt, equity, and advisory assignments for major banks, even as expensive money complicates the immediate outlook.

"Yes, the interest rate environment is not helpful, but as a topic in the boardroom, M&A hasn't slowed down," Guillermo Baygual, Citigroup’s global cohead of M&A, told Yahoo Finance. His assessment points to continued corporate interest even as market conditions become more demanding.

Executives will also face questions about whether deposit and other funding costs are squeezing lending margins. The Federal Reserve raised its benchmark policy rate last month while competition among United States lenders for customer cash was already intense.

"Loan growth is easier to find than deposit growth, and so it's putting pressure on deposit dynamics of raising funds," Coughlin said. That imbalance adds another test for banks trying to preserve the profitability of an exceptional first half as money becomes more expensive.

DISCLAIMER: GoldInvestors.news is not a registered investment, legal or tax advisor or broker/dealer. All investment/financial opinions expressed by GoldInvestors.news are from the personal research and experience of the owner of the site and are intended as educational material. Although best efforts are made to ensure that all information is accurate and up to date, occasionally unintended errors and misprints may occur.