Weight Watchers International Inc.'s stock rocketed 90% in active morning trade, putting it on course to have the biggest one-day percentage advance in its 14-year history, after Oprah Winfrey took a 10% stake in the weight management services company. Volume of about 32 million was more than 30 times the full-day average, according to FactSet. The stock, which has more than tripled over the last three months, is on course to close at the highest level since Feb. 26. The stock is still down 48% year to date, compared with a 1.4% decline in the S&P 500, as the company has struggled to add and retain subscribers.
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