Dow Jones Suffers Worst Day in Over Six Years The Dow plunged nearly 1,600 points on Monday marking the biggest point drop in history on a trading day. The Dow rose several hundred points to 1,175 by the end of the day. The drop amounted to 4.6 percent, which is the biggest percentage decline since August 2011. The drop was alarming given the steady upward climb of the stock market since Election Day last year.