Stocks ended lower Monday, led by industrials, materials and techs. Investors once again shrugged off a wave of merger-and-acquisition activity, which normally gives the market a boost.

The Dow Jones Industrial Average fell 39.21, or 0.4 percent, to close at 10,174.41. That brought its three-day loss to 2 percent.

The S&P 500 and Nasdaq also fell, with the tech-heavy Nasdaq the hardest hit of the three. The CBOE volatility index, widely considered the best gauge of fear in the market, was around 25 at the closing bell.

(Source: CNBC)