U.S. stocks fell significantly Wednesday, with the Standard & Poor's 500 index declining for a fifth consecutive session. The Dow Jones industrial average fell 205.99, or 0.8 percent, to 25,080.50. The broader S&P 500 index fell 20.60, or 0.8 percent, to 2,701.58. The technology-heavy Nasdaq composite index fell 64.48, or 0.9 percent, to 7,136.39.