The flight to defensive stocks reflects a demand for safer assets that was also seen in the bond market in August, where prices rallied and yields fell to record lows on some fixed-income benchmarks.
Longer-dated Treasury bonds were yielding less than short-term US government debt by the end of the month, a yield curve inversion that has been a harbinger of recessions in the past.
Headlines on the escalating trade war contributed to a series of sharp equity market sell-offs during the month, including the three worst trading days of the year so far. This made the month the most turbulent August in four years, according to the Vix volatility index, Wall Street's "fear gauge".
Liz Young, director of market strategy for BNY Mellon Investment Management, said investors "are looking at the inverted yield curve and weaker consumer numbers and that starts to add to a more concerning outlook than we had earlier in the year".
Utilities, real estate and consumer staples pay consistent dividends, so some investors use them as a proxy for bonds. The three sectors are also now the leading sectors of the market during the past 12 months.
"Now is the time to play things a little closer to the vest," said Steve Chiavarone, a portfolio manager for Federated Investors. "Higher tariffs could certainly impact corporate earnings."
The defensive positioning comes as forecasts for US corporate profits slide. Companies in the S&P 500 are set to increase profits 2.4 per cent this year, according to the latest FactSet estimates, far less than the 7.7 per cent anticipated at the start of the year.
As the latest earnings season drew to a close, FactSet calculated that earnings per share for S&P 500 companies contracted 0.4 per cent in the second quarter. Coming on top of a 0.2 per cent drop in the first quarter, that marked an "earnings recession", defined as two consecutive quarters of negative growth.
"As we get further and further into the year, the prospect of getting a trade deal this year is less likely," Young said. "The markets are on the precipice of joy and pain and it only takes a tweak to send us one way or the other."
Written by: Richard Henderson
© Financial Times