In the last trading week of the year, US stocks have faced substantial declines, with the Dow Jones Industrial Average plummeting over 700 points as the market grapples with thin trading conditions and rising Treasury yields. The S&P 500 and Nasdaq also reported significant losses, overshadowing what had been a generally strong year for US equities. Analysts are questioning the stability of major indexes as a tech sell-off accelerates and the anticipated Santa Claus rally fizzles. With only days left before the year closes, investors are wary of further downturns amid elevated market uncertainty.