Super Micro Computer’s (NASDAQ:SMCI) preliminary December quarter results and lackluster March quarter guidance might not impress at first

Super Micro Computer (NASDAQ: SMCI) stock is posting another day of big gains in Friday's trading. The server specialist's share price was up 9.5% as of 1:40 p.m. ET and had been up as much as 12.3% earlier today.

Super Micro’s stock is surging following a robust revenue outlook for next fiscal year. But analysts worry about stiffer competition in the market, among other issues.