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After experiencing a volatile week, the U.S. stock market experienced significant downturns.

Last week, U.S. stock markets showed a general decline, with the S&P 500 index dropping nearly 3%. Without the supportive remarks from Federal Reserve Chair鮑威爾 during his Friday speech, the market's decline could have been even more pronounced. The NASDAQ 100 index fell by 2.8%, while the Russell 2000 index dropped by 3.7%.

High盛 data revealed that hedge funds were intensifying short positions, with the index of short positions reaching the fastest pace since November 2024. Additionally, long-term investors sold off $50 billion, with the majority of these sales concentrated in technology, financial, and discretionary consumption sectors.

A report by High盛 identified the ten primary factors behind this market turmoil, with economic worries, trade disputes, and technical underperformance playing significant roles.

High盛總結(jié)：美股“雪崩”的十大原因

Following High盛's analysis, the ten primary factors behind the U.S. stock market decline are outlined in its research brief.

High盛的數(shù)據(jù)顯示，看跌趨勢有所加速，總風險敞口升至歷史新高，而凈風險敞口持續(xù)萎縮。美國基本面多空策略的總杠桿率上升了0.3個百分點，達到206.9%（三年期的第98百分位），而凈杠桿率下降了2.1個百分點，降至51.3%（三年期的第31百分位）。因此，基本面多空比率下降了2.3%，降至1.660（與五年最低水平持平）。

StrategyVincent Lin指出，對沖基金在過去四周中連續(xù)第四周凈賣出美國股票（過去10周中有9周是如此），原因是賣空比例超過買入比例，達到1.7:1。本周的總交易活動（賣空的代表）是7周以來的最大增幅。

Looking ahead to March 14 (the day before government shutdown), the implied volatility of the S&P 500 index is expected to be around 3%. Key focus areas will include potential trade developments and the upcoming sell-off season, which concentrates on industrial, consumer, and healthcare sectors.

Additionally, the CPI data on Wednesday will be a significant macroeconomic event. The Federal Reserve will enter a period of silence before its March 18/19 meeting. On the micro level, the earnings season is effectively over, except for some later-announced companies like consumer goods firms,甲骨文和Adobe. Investors should pay close attention to these key events to gauge the market's direction.