Billionaires Are Buying Beaten-Down Pfizer Stock Hand Over Fist. Should You Follow Their Lead?

Pfizer stock lost nearly half its value over the past couple of years, but some of the world's most successful investors bought millions of shares in the first quarter.The past couple of years haven't been easy ones to be a Pfizer (PFE -0.38%) shareholder. The windfall profits its COVID-19 products produced in the early days of the pandemic evaporated much faster than expected.Disappointed investors have pushed Pfizer's stock price down by more than half from its peak in late 2021. Perhaps sensing a bargain ...