https://www.reuters.com/article/us-robinhood-ipo/robinhood-slides-over-10-in-grim-nasdaq-debut-idUSKBN2EZ1ZT >Shares of Robinhood Markets Inc fell more than 10% after opening flat in their Nasdaq debut on Thursday, valuing the online brokerage at about $28 billion, a dismal reception to one of the most hotly anticipated listings of the year.