Shares of El Pollo Loco Holdings jumped in their trading debut, valuing the restaurant chain at more than $700 million.
CYNK Technology, the OTC stock that once broke a $6 billion market cap, dropped sharply in its first trades after an SEC halt.
Mark Cuban, who made his fortune as an Internet entrepreneur, tells CNBC "it's not 1999 all over again by a long shot."
Soaring markets are a plus for current players, but risky future returns are holding back young investors. NYT Reports.
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