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Lightning Round: Alexion Pharmaceuticals, Barclays, Calumet Specialty and More

American Capital Agency : Jim Cramer said he's sticking with this stock.

Alexion Pharmaceuticals : This is a very speculative stock, Cramer said. While he doesn't think it should be sold, he warned it could come down in price.

Barclays : Cramer prefers domestic banks right now.

Sarepta Therapeutics : This is a "highly speculative stock," Cramer said, adding he'd pull the trigger should it hit the $20s.

Calumet Specialty : Go with Linn Energy instead, Cramer said.

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