Cramer's lightning round: Plug Power must get expenses under control

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

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Rocket Pharmaceuticals Inc: "This is a very early stage company that has a lot in the pipe. I tend to like these companies. ... If you get a bunch of them, I think you're going to be fine."

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Plug Power Inc: "Plug Power's losing a fortune. ... They must get expenses under control."

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Sociedad Quimica y Minera de Chile SA: "I think there's too much political risk."

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Anavex Life Sciences Corp: "This is another one that I kind of like, I've got to tell you. ... I do not like losses in tech, but in biotech I can accept the fact that they have a good pipeline."

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GoPro Inc: "I've got to go stop. ... I just don't think that they're doing well enough to recommend."

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Illinois Tool Works Inc: "Buy more as it comes in. This is the kind of stock that is doing incredibly well."

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Ryan Specialty Holdings Inc: "I've got to find out what the hell went wrong with that one last week. ... It's usually a very normal, kind of regular, company, and it got slammed. I've got to find out before I can recommend."

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Shockwave Medical Inc: "Shockwave's a good company. Very expensive stock, though."

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