Internet gambling firm Partygaming saw pre-tax profits fall 57% in 2006 - as it began reshaping after a crackdown on internet gaming in the US.
Many online gaming firms have withdrawn from the US
It said that legislation making it practically illegal to trade in the US - where it had generated 75% of its earnings - had proved a "bitter blow".
Profits were $138.9m (£70.8m) - after the firm spent $250.4m on reorganising costs - mainly after the US ruling.
However, business elsewhere was in "excellent shape", it said.
Like other gaming firms including 888.com and Sportingbet, Gibraltar-based Partygaming withdrew from the US and began focusing on other markets.
In October, President George W Bush signed the Unlawful Internet Gambling Enforcement Act - making it, in effect, illegal for firms to collect money there.
Total revenue from its websites - which include PartyGammon.com and EmpirePoker.com as well as the Partygaming brand, was up 13% to $1.1bn (£561m).