Weight Watchers is losing weight with the latest stock price decrease. Oprah is the single biggest investor in Weight Watchers according to this article. Oprah Winfrey is still a billionnaire; just a very little ding in her bank account. Read more here. Fox News' Dom Calicchio, February 27, 2019, article: Oprah Winfrey Takes Big Financial Hit As Weight Watchers Stock Tanks.