Dow, S&P 500 close at record highs in holiday-shortened trading session

Market Performance - The Dow Industrials and S&P 500 reached record closing highs, with the Dow rising 288.75 points (0.60%) to 48,731.16 and the S&P 500 gaining 0.3% to end at 6,932.05 points [1][2] - Recent gains in US stocks have led to expectations of a "Santa Claus rally," a seasonal trend where the S&P 500 typically gains in the last five trading days of the year and the first two in January [6][8] Economic Indicators - Recent data indicates a resilient economy, with new applications for US jobless benefits unexpectedly falling last week [3] - The market is pricing in approximately 50 basis points of rate cuts from the Federal Reserve next year, although expectations for a January cut are low [3][4] Sector Performance - Micron Technology shares increased by 3.8% to a closing record of $286.68, following a strong forecast from the company [7] - Financials were among the best-performing sectors in the S&P 500, gaining 0.5%, while the energy index was the only sector in negative territory [7] Company News - Dynavax Technologies surged 38% after Sanofi announced plans to acquire the US vaccines company for around $2.2 billion [11] - Nike's shares jumped 4.6% after Apple CEO Tim Cook purchased approximately $3 million worth of shares [10]