Key takeaways
- Uncertainty around U.S. government policy – particularly tariffs – is resulting in elevated levels of market volatility, with some names down as much as -50%.
- Couple this volatility with a change in momentum and many crowded names, particularly within tech and AI, have seen a dramatic shift in fortune as last year’s momentum trade unwinds.
At a high level, it did not seem that bad. As of the second week of March, global equities were down roughly 6%, on par with the sell-off in late December and early January. That said, many of the trades that drove the market higher in 2023 and 2024 are now compromised.
Since the February peak, equity markets experienced a savage reversal in leadership, momentum and investor confidence. Last year’s favorites gave up months, and in some cases years, worth of gains in a matter of a few weeks.
The carnage started with last year’s big winners: tech and AI-related names. Both the ‘Mag 7’ and semiconductor stocks quickly shed -20%, with some of last year’s big winners down as much as -50%. From there, selling spread to other momentum trades, notably consumer discretionary and financials. What happened to abruptly change the investment environment and how should investors navigate this very different environment?
Some uncertainty and a lot of crowding
Apart from the magnitude of the losses, what distinguishes this selloff is the lack of a significant catalyst. To be sure, recent data releases, notably retail sales and the ISM manufacturing survey, have been soft. While by no means terrible, the data has cast some doubt on the economy’s resiliency. Beyond economic data, an unusual degree of uncertainty around U.S. government policy, particularly tariffs, has quickly undercut a narrative of stability and economic growth.
That said, what truly accounts for the magnitude of the sell-off is the extent to which investors were crowded into a few themes, notably AI infrastructure and a bulletproof U.S. consumer. Rather than a dramatic shift in fundamentals, stocks suffering the biggest losses have been caught up in an historic unwind of last year’s momentum trade. Momentum, which generally involves buying stocks with the best 12-month price appreciation, was the top performing strategy in 2024; it has quickly become the worst.
The fact that many of the names that defined last year’s trade were high growth companies with volatile shares has only exacerbated the losses. The flip side of this trade: last year’s underperformers, notably ‘defensive’ lower volatility names, are now this year’s biggest winners (see Chart 1).
Chart 1
Global sector performance - 1 months

Buy the beaten down quality names and manage volatility
While I still believe the U.S. stock market will end the year with modest gains, the last few weeks do mark a shift in investor behavior. To manage this new environment, I would focus on two strategies: buying now cheap(er) high quality growers and lowering overall portfolio volatility. Many of last year’s winners are now considerably cheaper. This is important as investors are paying more attention to value in stock selection. I would focus on the higher quality growth companies, i.e. those with the best cash-flow, margins and profitability. At the same time, consider adding less economically sensitive stocks, such as healthcare, funded by higher volatility stocks. Investors can still make money in this market, but the strategy needs to shift.
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About the Author
Russ Koesterich, CFA, JD, managing director and portfolio manager, is a member of the Global Allocation team.
Mr. Koesterich's service with the firm dates back to 2005, including his years with Barclays Global Investors (BGI), which merged with BlackRock in 2009. He joined the BlackRock Global Allocation team in 2016 as Head of Asset Allocation and was named a portfolio manager of the Fund in 2017. Previously, he was BlackRock's Global Chief Investment Strategist and Chairman of the Investment Committee for the Model Portfolio Solutions business, and formerly served as the Global Head of Investment Strategy for scientific active equities and as senior portfolio manager in the U.S. Market Neutral Group. Prior to joining BGI, Mr. Koesterich was the Chief North American Strategist at State Street Bank and Trust. He began his investment career at Instinet Research Partners where he occupied several positions in research, including Director of Investment Strategy for both U.S. and European research, and Equity Analyst. He is a frequent contributor to financials news media and the author of two books, including his most recent "The Ten Trillion Dollar Gamble."
Mr. Koesterich earned a BA in history from Brandeis University, a JD from Boston College and an MBA from Columbia University. He is a CFA Charterholder.
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