The SPDR Portfolio S&P 500 ETF (SPLG) closed at $70.80 on January 29, down 0.45%, as the S&P 500 index it tracks fell 0.47% to 6,039.31 amid investor caution following the Federal Reserve's decision to leave interest rates unchanged. The Fed's announcement, which maintained the federal funds rate between 4.25% and 4.50%, was accompanied by a statement highlighting persistent inflation concerns, contributing to market unease. The tech sector, a significant component of the S&P 500, faced additional pressure as Nvidia shares dropped 4% due to potential U.S. restrictions on AI chip sales to China, following the rise of Chinese AI startup DeepSeek. This development has intensified competitive pressures within the AI sector, affecting major tech stocks like Microsoft and Tesla, which also saw declines. The yield on the 10-year Treasury note, a key indicator of investor sentiment, hovered around 4.54%, reflecting ongoing market apprehensions.