As the year comes to a close, US stock markets are experiencing significant volatility, with the Dow Jones Industrial Average plunging over 600 points amid a broad pullback in technology stocks. Elevated Treasury yields are weighing heavily on investor sentiment, contributing to a pervasive decline across major indices, including the S&P 500 and Nasdaq. With only one trading day left in the year, investors are cashing in on previous gains, leading to a sharp downturn in the market. Despite a strong overall performance for the year, Wall Street is limping toward the new year on a sour note, grappling with losses from major tech players and concerns over the sustainability of market rallies.