The Dow Jones industrial average rose 27 points, or 0.2 per cent, to 17,293 as of 12:03 p.m. Friday, above its all-time closing high from the day before. The Standard & Poor's 500 index edged up less than one point, or 0.1 per cent, to 2,012, above its own record from the previous day.
The Nasdaq fell nine points, or 0.2 per cent, to 4,583.
Alibaba surged as it began trading on the New York Stock Exchange just before noon. It traded at $98 minutes after its debut, a 44 per cent rise from its initial public offering of $68 a share.