Cramer explained that the overarching reason the blue-chip index has performed the best this year is because it’s full of old-fashioned, profitable companies.

“Mad Money” host Jim Cramer rings the lightning round bell, which means he’s giving his answers to callers’ stock questions at rapid speed.

Steven Glass, managing director of Pella Funds Management, urged investors to be “hyper-vigilant” about valuations right now.