The US stock market faces a series of significant challenges in the second half of 2026 as it attempts to sustain its upward trajectory, with tests ranging from the durability of AI spending to high corporate earnings expectations and the interest rate outlook under a new Federal Reserve chair.
The benchmark S&P 500 index has risen over 8% year-to-date, extending its bull run to more than three years, while the tech-heavy Nasdaq Composite has gained 11%. However, investors have recently shown signs of unease, with both indices pulling back in June. Here are the key questions facing US equity investors for the remainder of the year.
Can the AI Spending Theme Continue to Drive Markets?
Massive spending on AI infrastructure has been central to the market rally, boosting profit expectations for numerous companies. According to JPMorgan, five companies, including Microsoft, Google parent Alphabet, and Amazon, are projected to have combined capital expenditures of approximately $730 billion this year.
Nicholas Janvier, Head of North American Equities at Columbia Threadneedle Investments, stated, "The market has certainly priced in the expectation that the level of capex we've seen will continue for the foreseeable future." Some investors remain cautious about whether hyperscale data center operators need to demonstrate sufficient return on investment from their expenditures.
Simultaneously, AI-driven optimism has fueled a surge in semiconductor stocks and also lifted other tech shares, industrials, and energy stocks related to data center construction and power supply.
Garrett Melson, Portfolio Strategist at Natixis Investment Managers Solutions, noted, "From a market perspective, the risk is that these trades are becoming technically crowded. Anything that starts to sow seeds of doubt in that narrative could leave you in a somewhat vulnerable position."
Can US Companies Meet Lofty Profit Expectations?
Strong first-quarter earnings from US corporations have supported the market, with robust profits expected to continue. According to LSEG IBES data, S&P 500 earnings are forecast to grow over 26% in 2026.
David Bianco, Chief Investment Officer for the Americas at DWS, said, "The main question is whether the expected earnings for the S&P 500 and the tech sector can be delivered. This is one thing that cannot have any excuses."
Tech and AI-related profits are not the only areas expected to perform well. All 11 sectors of the S&P 500 are projected to post higher earnings in 2026. Janvier pointed out that despite "AI grabbing all the headlines," consumer spending remains solid.
Can the Market Absorb Mega-Sized IPOs?
Following the recent IPO of SpaceX, AI bellwethers Anthropic and OpenAI are expected to follow suit in the coming months, potentially creating a wave of hot new companies for investors to buy into. Taken together, these super IPOs could generate a significant amount of new equity issuance for the market to absorb.
This cycle is also being closely watched for signs of market froth. Bianco commented, "This is a test of risk appetite and liquidity—how much dry powder is really still out there."
How Will the Fed Under New Leadership Tackle Inflation?
The start of Kevin Warsh's tenure as the new Chair of the Federal Reserve has already caught investors off guard, with his first meeting taking a hawkish stance. This raised expectations for near-term interest rate hikes as policymakers focus on controlling inflation.
The path of interest rates is poised to influence Treasury yields. Earlier bond market volatility this year already triggered several rounds of stock market sell-offs. Higher rates mean increased borrowing costs and could also pressure equities by making bonds a more competitive investment.
Noah Weisberg, Chief US Equity Strategist at BCA Research, stated, "I think valuations are reasonable. But that doesn't mean the market is immune to a repricing of interest rates."
Do Midterm Elections Matter for Stocks?
Congressional midterm elections have largely taken a backseat in markets this year, but political-related volatility could intensify as the November election approaches. According to CFRA data going back to 1945, midterm election years in the four-year election cycle have, on average, recorded the deepest intra-year market pullbacks, with the S&P 500 declining an average of 18%. The third quarter of midterm election years has also delivered negative average performance.
Natixis's Melson said, "Midterm election years are certainly prone to a bit of turbulence as the election approaches."
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