https://www.reuters.com/article/us-robinhood-ipo/robinhoods-shares-plunge-in-grim-stock-market-debut-idUSKBN2EZ1ZT >(Reuters) -Robinhood Markets Inc's shares fell more than 10% on their first day of trading, as many investors who used the popular trading app to participate in this year's "meme" stock trading frenzy snubbed its initial public offering (IPO). The company's easy-to-use interface has made it a hit among young investors trading from home on cryptocurrencies and stocks such as GameStop Corp during the COVID-19 pandemic . Some IPO investors stayed on the sidelines, citing concerns over its fro