Cramer's lightning round: I like Royalty Pharma

• 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.

Ping Identity: "There are so many companies in the identity business that people are starting to freak out that there's too much competition, and Ping is a very expensive stock."

Royalty Pharma: "I like Royalty Pharma. ... They do a lot of great biotech investing without a lot of risk. I like it."

Vertex Pharmaceuticals: "I say buy Vertex, do not sell Vertex."

Builders FirstSource: "Home Depot is going to report, Lowe's is going to report, but Builders First is a very good company."

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