The markets tumbled during the midday with the Dow dropping 87 points to 12,790 as investors questioned Greece's commitment to strict austerity measures. Nasdaq slipped 4 points to 2927.

On the upside

Jefferies expects Juniper Networks (NYSE: JNPR) to benefit from increased spending by AT&T (NYSE: T).

Kellogg (NYSE: K) will pay approximately $2.7 billion in cash to acquire the Pringles brand from Procter & Gamble (NYSE: PG).

Fourth quarter earnings slipped for Devon Energy (NYSE: DVN) but the results beat analyst expectations.

On the downside

FMC Technologies (NYSE: FTI) disappointed with flat fourth quarter earnings that missed analyst estimates and forecast full year earnings below expectations.

Although Owens Corning (NYSE: OC) swung to a profit for the fourth quarter, the results fell short of expectations.

Atlas Air Worldwide (Nasdaq: AAWW) reported lower fourth quarter earnings that missed expectations by a wide margin.

In the broad market, advancing issues outpaced decliners by a margin of 10 to 9 on the NYSE while decliners edged out advancers by 10 to 9 on Nasdaq. The Russell 2000 which tracks small cap stocks eased a point to 818.