Groupon (GRPN) went public at $20 a share and closed the first day at $26.11. Zynga

(ZNGA) went public at $10 a share but closed the first day at $9.50. Facebook (FB)

went public in 2012 at $38. While the price did initially pop to $42, the stock was trading below $28 within two weeks for a 26.3 percent decline from the IPO offer price. What subsequently happened to the prices of Groupon, Zynga, and Facebook one month, six months, one year, and two years after their IPOs? In May 2006, Vonage

(VG) went public at $17 and six years later the price of the stock remained below $17.

What is the current price of Vonage?