The S&P 500 index concluded Thursday’s session at 5,171, marking a 1% increase and reaching fresh historical highs. This rally shifted the week’s momentum to positive, potentially marking the 17th gain in the last 19 weeks, unless the index falls by 0.4% on Friday. Since the end of October, the index, as monitored through the SPDR S&P 500 ETF Trust (NYSE:SPY), has surged over 25%, a testament to the strong trend driving the U.S. equity market. Currently, the breadth of the market remains healthy with 71% of the S&P 500 stocks trading above their 50-day average, and an even more impressive 74% …