The markets advanced during the midday with the Dow rising 23 points to 12,907 after Greece finally approved austerity measures to secure a second round of bailout funds. Nasdaq gained 10 points to 2926.

On the upside

Imperial Sugar (Nasdaq: IPSU) narrowed first quarter losses and said that it may be sell its interest in Wholesome Sweetners.

A Seeking Alpha article listed Yingli Green Energy (NYSE: YGE) as one of four solar companies that top fund managers are acquiring.

Thoratec (Nasdaq: THOR) reported higher fourth quarter earnings that topped analyst estimates and forecast 2012 results ahead of expectations.

On the downside

Fourth quarter earnings climbed for iRobot (Nasdaq: IRBT) but revenue fell short of expectations and the company forecast current quarter and full year results below analyst estimates.

Array BioPharm (Nasdaq: ARRY) priced its public offering of 20 million common shares at the discounted price of $2.60 per share.

Groupon (Nasdaq: GRPN) disappointed with an unexpected loss for the fourth quarter even as revenue surged.

In the broad market, declining issues outpaced advancers by a margin of nearly 5 to 4 on the NYSE and by more than 9 to 7 on Nasdaq. The Russell 2000 which tracks small cap stocks lost 3 points to 824.