By Carolina MandlNEW YORK, April 15 (Reuters) - Trend-following hedge funds could sell between $20 billion and $42 billion in U.S. equities over the next month if the stock market continues to retreat, a Goldman Sachs note shows.Also known as CTAs (commodity trading advisers), trend-following hedge funds trade systematically to catch big trends in markets.Goldman Sachs said an S&amp;P 500 (.SPX) below 5,135 points “would flip short-term trend from more positive to negative” among trend-following hedge funds, triggering equity sales.A fall of 3.2% in the S&amp;P over the next month would force CTAs to sell around $20 billion in companies in the index and over $200 billion in global equities, the bank said in a note published on Friday. If the S&amp;P further retreated, sales in the S&amp;P could total $42 billion.The S&amp;P is down roughly 2.6% since April 11 amid stronger-than-expected U.S. prices and sales and renewed geopolitical concerns.Overall, last week hedge funds on net sold U.S. equities for a second straight week, mostly after the a strong consumer price index surprised investors on Wednesday, casting further doubt on whether the Federal Reserve will start cutting interest rates soon.In a separate note, Goldman said hedge funds were net buyers of Chinese equities for the third straight week and net sellers of U.S. energy stocks.

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Trend-following hedge funds could sell up to $42 billion in US shares if the stock market continues to decline, according to a Goldman Sachs note. A fall in the S&P 500 below 5,135 points would trigger equity sales, with potential sales of $20 billion in the index and over $200 billion in global equities. Hedge funds have also been net buyers of Chinese equities for the third straight week.

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HEDGE FLOW-Trend hedge funds could sell up to $42 bln in US shares, says Goldman