Sea Limited (SE -0.67%) minted a lot of millionaires in the first four years after its initial public offering (IPO) in October 2017. The Singapore-based e-commerce and gaming company went public at $15, and its shares soared to an all-time high of nearly$367 on Oct. 19, 2021. A $50,000 investment in its IPO would have blossomed into$1.2 million. However, Sea's stock now trades at about $58 -- so that investment would have shriveled to roughly$193,000. That's still a near-four bagger gain in less than se ...