The US stock Christmas rally is in full swing! The year-end investment window has officially opened, and the current market has already shown clear signs of warming. Seizing seasonal bonuses is the right move【Key Highlights】Index performance: The three major indices are oscillating and rebounding, gathering strength for an upward push, led by tech stocks, with AI computing power and the semiconductor industry chain (leaders like Micron, Oracle, etc.) posting the largest gains. Consumer sectors are rising in tandem, and market profitability is gradually spreading; Historical backing: Reviewing nearly 20 years of data, the S&P 500 "Christmas trading window" (the last 5 days of the year + the first 2 days of the new year) has an average increase of 1.3%, with an almost 80% probability of gains; the last two weeks of December have a gain probability of up to 75%, confirming strong seasonal bonuses; Capital signals: Retail and institutional funds are simultaneously increasing positions in bullish options, with continuous net inflows of on-exchange funds. Major institutions like Goldman Sachs have explicitly stated that "the year-end seasonal trend is difficult to reverse."