Cramer's Lighting Round: Sell Aspen Aerogels

• 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.

ConocoPhillips' year-to-date stock performance.

ConocoPhillips: "I want you to hold ConocoPhillips."

Rhythm Pharmaceuticals' year-to-date stock performance.

Rhythm Pharmaceuticals: "Speculative play...I am not against speculating biotechs right now. Looks like that there are so many bids, I'm willing to let a stock catch fire."

Marvell Technology's year-to-date stock performance.

Marvell Technology: "I would buy some and then wait until under 60 to buy the rest."

Lam Research's year-to-date stock performance.

Lam Research: "I like Lam very much. I do think that right now we're having a pause in that group...Let's wait until that stock goes lower, and we'll feel better."

Enovix's year-to-date stock performance.

Enovix: "You got to be making some money in that business. If you're not making any money in that business, then I can't say to buy the stock."

Aspen Aerogels' year-to-date stock performance.

Aspen Aerogels: "This thing is up so big, and what a great opportunity to sell the stock of a money-losing company after you've made a lot of money. Take the profit."

McKesson's year-to-date stock performance.

McKesson: "Don't sell McKesson."

PNC's year-to-date stock performance.

PNC: "...You buy some now, and you buy some down 10%, and you will have a terrific position that will last for a very long time."

Vale's year-to-date stock performance.

Vale: "It's too low to sell."

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