Despite uncertainty about the legality of online poker in the US, retail investors have been betting on shares in PartyGaming after trading opened to the public.
Shares lift 23% to 143p from their initial public offer price of 116p, making the online poker company valued at £5.7bn.
Dresdner Kleinwort Wasserstein confirmed the shareholders will exercise an over-allotment option and sell a further 115.3 million shares.
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