Stocks opened with narrow gains in mixed trade Wednesday, as investors digested a wave of earnings reports and company news. The Nasdaq led, up 0.3%. The S&P 500 held a 0.1% gain and the Dow Jones industrial average was fractionally higher. Volume jumped 26% on the Nasdaq and was down 11% on the NYSE compared with Tuesday morning's activity. Business inventories notched up 0.7% in September, a sixth straight monthly gain. Analysts had projected a