The momentum trade — buy what’s winning, sell what isn’t — was already running red-hot heading into this week. Now a pause in the Iran war, strong US jobs data and another sharp rally in AI chips just piled on more fuel.
The same risk-on playbook is working across everything from junk bonds to crypto. In the stock market, one momentum index closed on Friday near the highest since the global financial crisis as the S&P 500 punched to a new peak, a gauge of chipmakers jumped 11% in five sessions, and oil drifted lower on hopes for an end to the Iran conflict.
Barclays Plc strategists say the momentum rally has reached extremes that historically foreshadowed selloffs. At Goldman Sachs Group Inc, the trading desk wrote this week that valuations for high-momentum stocks are stretched and positioning is among the highest in recent years, based on prime brokerage data.
The dominance of the trend-chasing trade reflects the resilience of the US economy and a market staunchly all-in on the AI wave, with chipmakers leading the charge. For some on Wall Street, the trade has begun to look self-reinforcing — gains in a narrow set of large-caps are drawing more cash into passive funds that own those same names. Still, even those riding the rally say fundamentals are backing the trade, for now.
“Valuation has been thrown out of the window for the time being because there is no doubt that there’s a tightness in supply” in AI infrastructure, said Mark Hawtin, head of global equities at Liontrust Asset Management, which runs and advises about £20bn ($27bn). “When does it change? That is the million-dollar question and extremely difficult to answer because I think there’s a huge amount of liquidity.”
To him, the demand-supply imbalance in AI infrastructure will abate at some point, bringing down elevated spending on semiconductors and the like. But in a momentum-driven market, being early on a rotation call hurts almost as much as being wrong.
A run of good news kept animal spirits running this week. US jobs growth beat estimates in April, while apparent progress toward an Iran deal pulled oil lower.
Among so-called factors tracked by quantitative investors, momentum is a chameleon, adapting to whatever has been rallying in markets, typically over a one-year period. It has a history of crashing when market leadership abruptly shifts such as during the 2008 global financial crisis and introduction of Covid vaccines in 2020.
That typically comes as more investors crowd into winning names, which is starting to happen again, Barclays’ Head of Global Equities Tactical Strategies Alexander Altmann warned in a note this week. Traders had a taste of that rotation Thursday, when renewed US-Iranian clashes briefly hit the crowded AI winners that drive the trade. Momentum posted its worst session in three months even as the S&P 500 only modestly declined. By Friday’s close, the trade roared back.
“Following the +50% rally in AI winners from the end of March lows, both AI, and thus the momentum factor feels vulnerable in the short term as we saw on Thursday,” said Michael Romano, head of hedge fund equity derivative sales at UBS Securities. “I can see a case for owning short-term downside in AI winners to hedge.”
Through the lens of quant factors, the latest leg up in momentum has come as most other investing styles faltered, S&P Global indexes show. The value factor buying cheap stocks is down after a strong first quarter. In a sign of risk appetite, the factor buying steadier stocks is on course for its sixth straight month of declines.
Quality, which favors profitable and low-leverage companies, is down another week, with its 60-day correlation with momentum around its most negative in about a year. Some of that is the signature of a risk-on rotation — defensive factors fade when speculative ones run. Some of it is sector-specific. Software incumbents, long among the highest-profitability names in the market, have been under particular pressure.
“Software companies are basically asset-light and have had very high profitability for a very long time,” said David Blitz, chief researcher for quant equity at Robeco. “But investors are worried that this might be disrupted by AI, which might make a lot of software IP redundant.”
As stretched as the market looks, fundamentals are supporting the momentum-led rally. About 85% of S&P 500 names have beat their earnings estimates so far this season, the highest rate in five years, while profit forecasts have also been climbing, according to Bloomberg Intelligence.
There’s a dose of speculative euphoria, too. Retail investors are back to pre-conflict buying levels, with memory and AI names still among their favorites, JPMorgan Chase & Co quant strategists led by Arun Jain wrote this week.
For Hawtin at Liontrust, the strength of momentum has reshaped how his team operates in recent years. They lean on technical indicators to stay with the trend even when other metrics may say otherwise.
“With some of the semiconductor names, it does feel a little bit casino-like,” he said. “It’s not rational on a long-term investing time horizon for these names to be where they are, but as we know, markets can remain irrational for some time.”
