Lightning Round: Buy more Pfizer, says Jim Cramer

'Mad Money' host Jim Cramer weighs in on stock including: Pfizer, First Solar, Six Flags, Equity Residential, Vertiv, Moderna, and Powell Industries.

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'Mad Money' host Jim Cramer weighs in on stock including: Pfizer, First Solar, Six Flags, Equity Residential, Vertiv, Moderna, and Powell Industries..