NEW YORK (CNNMoney) -- This holiday week hasn't been a happy one for Groupon. Its shares took a major hit for two days in a row.
A downturn in the broader market this week has hit tech stocks, but Groupon and other newly public startups have fallen even more than the rest of the sector on renewed dot-com bubble concerns.
Groupon (Groupon's initial public offering earlier this month.) shares plunged 10% on Monday and fell almost 15% on Tuesday to close at $20.07. That's mere pennies above the $20 price of
This year has been chock-full of Internet IPOs, and their typically large early gains have led to concerns about overvaluation.
Shares of business networking site LinkedIn (trading 7% lower for much of the session on Monday, the first day that some company insiders were allowed to dump the stock.) were
That phenomenon isn't exclusive to LinkedIn. It's typical for IPOs to include 180-day "lockup" agreements that prevent certain early investors from unloading their stakes.
Groupon's own lockup period ends May 2. Internet radio company Pandora's () ends on December 12, and real estate Zillow's ( ) expires January 16.
Shares of all three of those companies fell after the LinkedIn news on Monday -- Zillow lost almost 13% and Pandora slipped about 3% -- and their losses extended on Tuesday. Investors are clearly concerned about others following LinkedIn's dour post-lockup path.
|McDonald's gives Charles Ramsey free food for a year|
|Where your donation dollars go|
|Doomsday investors betting on market crash|
|Investors consider life after Fed stimulus|
|The 'chicken poop' credit and other bad tax breaks|