USA Today When according to USA Today. USA Today Oprah Winfrey announced that she purchased a 10% stake lose almost 73% of its value Oprah buys 10% of Weight Watchers, stock soars USA Today suggests that drop reflects shifts USA Today USA Today Oprah Buys 10 Percent of Weight Watchers Stock USA Today terms a general emphasis on healthier, happier living this deal When this deal lose almost 73% of its value ask Weight Watchers ask Weight Watchers