Social gaming company Zynga begins trading on NASDAQ
16 December 2011 Last updated at 11:52 GMT
Zynga starts trading on the NASDAQ stock exchange on Friday.
The online social gaming company, which makes Facebook games including Mafia Wars, Farmville and Castleville, raised $1bn (£1.5bn) in its flotation.
That means the firm could be worth approximately $9bn (£13.5 bn).
Julie Meyer from Ariadne Capital, which advises and invests in young technological companies, told Radio 5 live Wake Up To Money how Zynga makes its money.
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