Robinhood Markets, the trading app that has grown rapidly during the pandemic, filed for an initial public offering on Thursday with plans to list on Nasdaq under the ticker symbol "HOOD." There are 17 banks in the underwriting syndicate, led by Goldman Sachs and JPMorgan . The filing documents show the company has 17.7 million monthly active users and $81 billion in assets under custody. It posted a net loss of $1.4 billion in the first quarter, compared with a loss of $52.6 million in the year-earlier period. Revenue climbed to $522.2 million from $127.6 million.