https://www.reuters.com/article/us-robinhood-stocks/robinhood-sparks-buzz-on-reddit-shares-up-15-idUSKBN2F51E8 >(Reuters) -Shares of Robinhood Markets Inc jumped more than 15% in premarket trading on Wednesday as interest from star fund manager Cathie Wood and small-time traders set up the stock for a fourth session of gains after its underwhelming IPO last week.