S&P 500 ends down as investors eye slowing economy

S&P 500 ends down as investors eye slowing economy

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* U.S. composite PMI at lowest since February 2021

* Zoom tumbles on weak forecast

* Macy's shares rise on earnings beat

By Noel Randewich and Bansari Mayur Kamdar

Aug 23 (Reuters) - The S&P 500 ended down on Tuesday as investors focused on data showing a slowing economy ahead of a U.S. Federal Reserve gathering later this week in Jackson Hole, Wyoming.

The S&P 500 ranged between small gains and losses for much of the session after data showed private-sector business activity in the United States contracted for a second straight month in August, with particular softness in the services sector as demand weakened in the face of inflation and tighter financial conditions.

The S&P Global flash composite purchasing managers index, or PMI, for August dropped to 45, the lowest since February 2021, from 47.7 in July. A reading below 50 indicates a contraction in activity.

Stocks have declined in recent sessions ahead of this week's central bank gathering in Jackson Hole, where Fed Chair Jerome Powell is expected on Friday to reinforce a strong commitment to stamp out inflation running at four-decades high.

Traders are split between expecting a 50 basis points hike and a 75 bps hike by the central bank after several policymakers recently pushed back against expectations of a dovish pivot and emphasized the Fed's commitment to fight against inflation.

"What we have seen in the past week is the realization that the Fed could still raise interest rates by 75 basis points in September," said Jake Dollarhide, chief executive of Longbow Asset Management in Tulsa, Oklahoma. "The market fears that Powell's going to go back into a hawkish stance."

The benchmark 10-year yield rose to its highest level since late July.

Zoom Video Communications Inc ZM.O tumbled after the former "stay-at-home" stock darling cut its annual profit and revenue forecasts.

After a rough start to the year, markets rallied since mid-June on hopes inflation has peaked, but that summer rally snapped last week due to renewed fears around an aggressive monetary policy tightening path by the Fed.

According to preliminary data, the S&P 500 .SPX lost 9.34 points, or 0.23%, to end at 4,128.65 points, while the Nasdaq Composite .IXIC lost 0.27 points, or 0.00%, to 12,381.30. The Dow Jones Industrial Average .DJI fell 154.39 points, or 0.47%, to 32,903.09.

The S&P 500 energy index .SPNY rallied, tracking a jump in crude prices as tight supply moved back into focus.

Macy's Inc M.N rose after the retailer beat quarterly profit estimates, while Palo Alto Networks Inc PANW.O surged after the cybersecurity firm posted upbeat quarterly results and announced a stock split plan.

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Reporting by Bansari Mayur Kamdar and Devik Jain in Bengaluru
and by Noel Randewich in Oakland, Calif., Editing by Marguerita