Cramer's lightning round: Inogen is 'in the penalty box'

• 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.

JD.com: "We don't need JD ... because we've got Alibaba. Now they're both up a lot, but I like Alibaba very much."

Adverum Biotechnologies: "Well look, this is the kind of speculative I like and I encourage. I encourage this kind of speculation on Mad Money because as long as you don't put too much money in it, maybe this is the home run. Don't put too much money in it and it can work."

Inogen: "They missed the numbers really big. Now that means they're in the penalty box. I need to see not one but two quarters before I'd be willing to buy that. That was a terrible miss, it deserved to go down."

Trade Desk: "That company is miraculous, it's terrific."

Stag Industrial: "The industrial REITs are really the only REITs right now that are actually working, and they're working phenomenally."

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