Investors Are Betting on a Market Melt-Up
They have flocked to stock funds at a pace rarely seen since 2008, but some warn that shares look expensive historically
4 min
A roaring market rally since the U.S. presidential election has driven up the price of everything from shares of technology and manufacturing giants to cryptocurrencies. Many investors are betting it has room to run.
Investors have stampeded into funds tracking U.S. stocks and picked up trades that would profit if the rally that recently sent the S&P 500 above 6000 for the first time reaches new heights.
U.S. equity exchange-traded and mutual funds drew nearly $56 billion in the week ended Wednesday, the second-largest weekly haul in records going back to 2008, according to EPFR data. Such funds have drawn inflows for seven consecutive months, the longest streak since 2021, when a dizzying market melt-up sent stocks to repeated records.
Driving the optimism? Many investors said they expect lower taxes and fewer regulations during Donald Trump ’s second term as president.
Dominic Rizzo, a technology portfolio manager at T. Rowe Price , said tariffs could boost U.S. manufacturing, driving a surge in domestic spending and investment. Other investors are simply breathing a sigh of relief that the election has passed.
The share of investors surveyed by the American Association of Individual Investors who said they were bullish jumped to 49.8% this past week, while the share of those reporting a neutral sentiment dropped to the lowest level since 2022. About 40% of those surveyed said the U.S. election made them more optimistic about the market.
“Animal spirits are alive and well right now,” Rizzo said.
Rizzo oversees shares of Nvidia and other tech giants. After a big run-up, he is still optimistic about the group ahead of Nvidia’s earnings report Wednesday. Investors are also fixated on the presidential transition and how it might shape the market’s winners and losers.
Some market watchers caution that investors might be too quick to latch on to policies that could boost markets, while ignoring plans that might stir inflation and market volatility.
Stocks wobbled at the end of the past week, and bitcoin retreated. Trump’s appointment of the vaccine skeptic Robert F. Kennedy Jr. as health and human services secretary pressured several stocks including Moderna and Pfizer . Shares of Tesla , which soared after the election and pushed the company’s market cap back above $1 trillion, have stumbled in recent sessions. Shares of Trump Media & Technology Group fell 12% for the week.
Still, the S&P 500 index and the Nasdaq Composite closed Friday within about 3.2% of their respective record highs. With just weeks left in 2024, the S&P 500 is on track to jump more than 20% for the year, the second consecutive year of gains of that magnitude. It is a back-to-back advance that has been seen only three times over the past century, according to Deutsche Bank.
Joe Johnson, 37, said he has waded into hot stocks including Nvidia, Tesla and a crypto play, MicroStrategy . His portfolio has swelled this year, and he is feeling so good about the market that he is thinking about pouring his cash pile into stocks. He is eyeing such industrial giants as Caterpillar and Deere , which he believes will benefit from a strong economy.
“I am bullish on the market,” Johnson said. “The euphoria everyone is feeling is warranted.”
Johnson said he is excited about Trump’s presidency and expects his policies to benefit his small business in Maryland, which sells boat-maintenance kits, engine parts and protective covers.
Many investors have piled into segments of the market such as small companies, which are especially sensitive to the economy.
The Russell 2000 has risen almost 2% since the election, and one of the largest exchange-traded funds tied to the index attracted $3.9 billion in inflows in a single session this month, the most since June 2007. Money managers, meanwhile, have increased positions that would pay out if the rally continued, driving net bullish bets in the futures market to the highest level in more than four years.
Some of the riskiest corners of financial markets are thriving too. Three of the top five days for trading in call options, trades that give the right to buy shares, have occurred this month, according to options records going back to 1973. That has pushed up the cost of bullish trades that would profit if stocks soared.
A frenzy of trading in cryptocurrencies sent bitcoin prices above $90,000 and unleashed a historic rush into crypto funds. Dogecoin, a speculative coin backed by nothing, shot up after Trump revealed plans to create a government-efficiency department called DOGE, to be co-led by Elon Musk , a dogecoin evangelist. Its $55 billion market cap now tops that of Ford Motor.
Trading in the over-the-counter market, which includes riskier securities such as penny stocks, has surged 27% in November from the same time last year, according to OTC Markets Group.
Some said stocks are looking expensive after their recent run. The S&P 500 recently traded at 22 times its expected earnings over the next 12 months, above its five-year average of roughly 20. A Bank of America strategist, Savita Subramanian, called market sentiment and positioning “dangerously bullish” in a note to clients Friday.
Bond investors have been sending a different signal, driving the benchmark 10-year Treasury yield to 4.426% on Friday, up from 4.072% around a month ago. They are banking on bigger deficits and higher inflation in the years ahead. Federal Reserve Chair Jerome Powell indicated Thursday that the central bank will take its time to trim interest rates, pressuring bonds and stocks.
One measure closely tracked by investors, the equity risk premium —or the gap between the S&P 500’s earnings yield and that of 10-year Treasurys—shrank close to zero, the lowest level since 2002, according to Dow Jones Market Data. That means the reward for owning stocks over bonds is dwindling.
“The market is awfully expensive to have a melt-up,” said Rob Arnott , the founder and chairman of Research Affiliates.
Copyright 2020, Dow Jones & Company, Inc. All Rights Reserved Worldwide. LEARN MORE
From making unpopular decisions to learning when to listen, leaders from five businesses reveal what nobody prepared them for — and how running a company has challenged their expectations.
Technology and semiconductor shares fell sharply as investors questioned the debt financing the AI infrastructure boom and confronted higher rates and Chinese competition.
Technology and semiconductor shares fell sharply as investors questioned the debt financing the AI infrastructure boom and confronted higher rates and Chinese competition.
4 minA sharp technology sell-off has exposed a new anxiety on global markets: whether the enormous borrowing behind the artificial-intelligence infrastructure boom can generate sufficient returns as interest rates rise and Chinese competition intensifies.
The artificial-intelligence investment boom has powered technology shares, semiconductor manufacturers and data-centre operators to extraordinary heights. Last week, investors were given a reminder that much of this expansion is being built with borrowed money.
The technology-heavy Nasdaq Composite fell 4.5 per cent over the week ended October 16, its weakest performance since late June. Semiconductor shares suffered an even deeper correction, with the Philadelphia Semiconductor Index losing about 11.4 per cent.
The selling spread quickly through global markets. Micron Technology fell 14.6 per cent over the week, while South Korea’s Samsung Electronics and SK Hynix dropped approximately 18 per cent and 24 per cent respectively.
This was more than a routine bout of profit-taking. Investors were reassessing three interconnected risks: higher interest rates, the rapidly expanding debt burden attached to AI infrastructure and the prospect of stronger competition from Chinese memory-chip manufacturers.
The debt behind the AI build-out
Artificial intelligence requires a physical infrastructure network of enormous scale. Data centres must be built, advanced processors purchased, power supplies secured and cooling systems installed before customers begin generating meaningful revenue from them.
Technology companies are increasingly supplementing their own cash with corporate bonds, syndicated loans, equipment leases, private credit and project-level financing.
JPMorgan describes the emerging funding model as a combination of conventional corporate borrowing and project finance tied to individual data-centre assets. In Australia, the Reserve Bank estimates that syndicated loans accounted for approximately three-quarters of data-centre financing during 2025 and 2026 to date.
The numbers are becoming large enough to affect broader credit markets. The Federal Reserve Bank of Dallas has cited Wall Street estimates suggesting AI-related investment-grade bond issuance could approach US$300 billion in 2026 alone.
That borrowing is not automatically problematic. Debt can be an efficient way to finance long-lived infrastructure when future revenue is sufficiently predictable. The concern is that AI technology, customer demand and computing economics are changing much faster than the repayment schedules attached to the assets.
A data centre financed today may carry debt for years. Investors must therefore make assumptions about future utilisation rates, electricity prices, chip performance, customer concentration and the amount businesses will ultimately pay for AI computing.
When interest rates rise, those assumptions become less forgiving.
Inflation changes the calculation
September’s US inflation data intensified the pressure. Consumer prices increased 3.7 per cent over the year, ahead of market expectations and up from 3.4 per cent in August.
The hotter reading reduced confidence that interest rates would fall quickly and pushed bond yields higher. That matters particularly for companies whose valuations depend on profits expected well into the future, as well as highly leveraged infrastructure operators that may need to refinance.
CoreWeave has emerged as a closely watched test case. The specialist cloud-computing company has accumulated substantial debt and lease obligations to build AI capacity, while relying on a concentrated group of large technology customers.
Its shares fell sharply during the sell-off, while the cost of insuring its debt against default climbed. CoreWeave has argued that its contracted backlog more than covers its obligations and that financial markets do not always understand its business model. Nevertheless, its securities have become a proxy for investor confidence in debt-funded AI infrastructure.
Oracle, another major investor in AI computing capacity, fell 8.8 per cent in Friday trading, while CoreWeave dropped 15.5 per cent.
The question is shifting from how much AI infrastructure can be built to how profitably it can be operated.
China adds another source of pressure
Interest rates were not the only catalyst. Reports of advances by Chinese memory-chip producer ChangXin Memory Technologies raised concerns that lower-cost Chinese products could increase competition across the global semiconductor industry.
Memory chips are essential to AI systems, but the industry is historically cyclical. Periods of tight supply and high pricing can encourage rapid investment, eventually producing oversupply and falling margins.
The prospect of a well-funded Chinese competitor expanding its technological capabilities unsettled investors in Samsung, SK Hynix and Micron. It also demonstrated that AI-related demand does not insulate chipmakers from conventional competitive pressures.
That combination—slower rate cuts, more expensive financing and potentially cheaper supply—challenged the assumption that every company exposed to AI would enjoy continually expanding margins.
A reset rather than the end of the boom
The sell-off does not establish that the AI boom is ending. Demand for computing power remains strong, the largest technology companies continue to generate formidable cash flows and many infrastructure projects are backed by long-term customer contracts.
What has changed is the market’s willingness to overlook the price and financing structure of that growth.
The most resilient companies are likely to be those able to fund investment from operating cash flow, secure long-duration customers and demonstrate that new capacity will earn returns comfortably above its financing costs.
More speculative operators may face greater scrutiny, particularly where debt is expensive, customers are concentrated or expected revenue depends on demand that has not yet materialised.
For Australian investors, the lesson extends beyond US technology shares. Local data-centre operators, infrastructure funds, electricity suppliers and property groups are increasingly exposed to the same investment cycle.
Artificial intelligence may remain one of the defining growth themes of the decade. But last week’s correction showed that enthusiasm for the technology does not eliminate financial discipline.
The next stage of the AI boom will be judged not only by computing power, model performance or demand for chips, but by something more traditional: whether the assets being financed can generate enough cash to repay the money borrowed to build them.
Fact box
Nasdaq Composite: Down 4.5 per cent for the week ended October 16, 2026
Philadelphia Semiconductor Index: Down approximately 11.4 per cent
Micron Technology: Down approximately 14.6 per cent
Samsung Electronics: Down approximately 18 per cent
SK Hynix: Down approximately 24 per cent
US September inflation: 3.7 per cent annually
Estimated 2026 AI-related investment-grade issuance: Approximately US$300 billion
Set on one of the city’s last absolute riverfront sites, The Riversdale by Mosaic combines irreplaceable waterfront ownership with one of Brisbane’s most significant residential opportunities.
Australia’s housing market rebounded sharply in 2025, with lower-value suburbs and resource regions driving growth as rate cuts, tight supply and renewed competition reshaped the year.
