'Mad Money' Lightning Round: Penn National, Alcoa, Sherwin-Williams

Jim Cramer’s bullish on Penn National, Alcoa and Sherwin-Williams, but wants more transparency from Palantir.
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Here's what Jim Cramer had to say about some of the stocks that callers offered up during the "Mad Money Lightning Round" Monday evening:

Penn National Gaming  (PENN) - Get Report: "I like Penn National very much. I love the tie-up with Barstool Sports."

Alcoa  (AA) - Get Report: "That was a brilliant quarter. I'm a buyer."

Sherwin-Williams  (SHW) - Get Report: "This was a great quarter for them. "

Novocure  (NVCR) - Get Report: "This has still not been largely recognized by the medical community. When it is, it's going higher."

Social Capital Hedosophia  (IPOB) - Get Report: "Wait until the acquisition is complete and this one becomes Sofi."

Hydrofarm HYFM: "I like GrowGeneration GRWG in this space."

Aemetis  (AMTX) - Get Report: "These stocks all work. This is in a sweet spot right now."

Palantir Technologies  (PLTR) - Get Report: "I want more transparency. This company is too opaque."

Read the full story from Monday's show, Cramer's Mad Money Recap: Walmart, Costco, in which Cramer talks about this big rotational pattern, and which retailers are poised to gain. Cramer interviewed Malcolm Wilson, the current CEO of XPO Logistics  (XPO) - Get Report Europe and the incoming CEO for GXO Logistics, which will soon spin off from XPO; and Sara Greenstein, president and CEO of Lydall  (LDL) - Get Report.

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At the time of publication, Cramer's Action Alerts PLUS had no position in the stocks mentioned.