Stocks ended lower Friday, pulling major benchmarks into negative territory for the third consecutive week as investors again dumped high-flying tech shares. The Dow Jones Industrial Average fell around 245 points, or 0.9%, to end near 27,657, according to preliminary figures. The S&P 500 lost around 38 points, or 1.1%, to close near 3,319, while the tech-heavy Nasdaq Composite dropped around 117 points, or 1.1%, finishing near 10,793. For the week, the Dow fell less than 0.1%, while the S&P 500 and Nasdaq each gave up 0.6%.