Shares of Super Micro Computer slid Friday as the server maker quickly approaches a delisting deadline. The stock was down 0.5% to $17.92 on Friday, trading lower for its sixth day in a row, according to Dow Jones Market Data. After receiving a letter from the Listing Qualifications Department of the Nasdaq Stock Market on Sept. 17, the company had 60 calendar days to file or submit a plan to the Nasdaq to regain compliance with listing rules.