U.S. equity markets opened unchanged on Friday, though the main indexes were on track for second consecutive weekly gains. Investors digested a number of earnings reports, that mostly topped expectations. The Dow Jones Industrial Average was flat at 24,673. The S&P 500 index opened unchanged at 2,693. Meanwhile the Nasdaq Composite was off by 15 points, or 0.2% to 7,220 at the open. Despite tepid trading over the past two sessions, the main indexes looked at solid weekly gains. Among the best performers on the S&P 500, General Electric Company shares jumped 6% after quarterly earnings topped expectations.