https://blog.wongcw.com/2021/04/01/robinhood%e5%9c%a8ipo%e5%89%8d%e5%8f%96%e6%b6%88%e4%ba%86%e6%ad%a1%e6%85%b6%e7%b4%99%e5%b1%91%e5%8b%95%e7%95%ab/