Markets plummet on Greek woes

The collapse of Greek debt discussions sparked fears that Greece will exit the euro zone. The markets plunged during the midday with the Dow slumping 226 points to 17,719. Nasdaq plummeted 72 points to 5,008.

On the upside

Shares of Peabody Energy (NYSE: BTU) rose after the Supreme Court ruled that costs must be considered when the Environmental Protection Agency implements new air pollution regulations.

Aratana Therapeutics (Nasdaq: PETX) reported positive results from a field effectiveness study of the appetite stimulation drug capromorelin for dogs.

On the downside

Shares of DS Healthcare Group (Nasdaq: DSKX) extended its losses.

Guggenheim downgraded First Bancorp (NYSE: FBP) from a Buy rating to a Neutral rating.

Comments by Puerto Rico Governor Alejandro Garcia Padilla that Puerto Rico would not be able to pay its debts sent shares of financial services firm Popular (Nasdaq: BPOP) tumbling.

Shares of Cheetah Mobile (NYSE: CMCM) continued to fall.

In the broad market, declining issues outpaced advancers by a margin of nearly 6 to 1 on the NYSE and by more than 4 to 1 on Nasdaq. The broader S&P 500 plunged 26 points to 2074. Bitcoin gained $8 to $255.