Cramer's lightning round: We like Dynatrace

• 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.

Ibio: "I've got to do a little more work on that $560 million bad boy, and we will come back. Interesting chart."

Vaxart: "Did you read the article about the insider selling? To me it was a — I didn't like the tone of it, let's put it that way. I didn't like the tone of Vaxart."

Dynatrace: "We like Dynatrace. Look, it's been a real winner. I don't know. It's a very expensive stock in terms of price-to-earnings ratio, so I don't think anyone would buy it. I think you should stick with it."

Rosetta Stone: "This is an interesting, good household brand stock."

Blink Charging: "I can't recommend it. I like Tesla."

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