Merlin Entertainments claimed a lack of visitors to its Bangkok attractions have affected an otherwise strong performance.
In its trading update it said that the two attractions it runs in Bangkok show little sign of improvement and continue to drag on growth.
However it said Madame Tussauds Singapore, which opened last month, had enjoyed good initial guest satisfaction.
And that the Legoland Parks Operating Group had remained strong, benefitting from the release of the Lego Movie earlier in the year.
Merlin Entertainments said that business has traded well since the summer with all three Operating Groups showing continued revenue growth.
It said the Resort Theme Parks Operating Group has seen like for like revenue growth improve in recent months, benefiting from good Halloween offerings and unseasonably warm weather in the UK.
Merlin said that it expects to report earnings before interest, tax, depreciation and amortisation between £407m and £411m for 2014.
Nick Varney, Merlin Entertainments chief executive officer, said:"As we approach the end of our first financial year as a public company, I’Ÿm pleased to report continued good trading across the business, reflecting positive underlying trends, favourable weather in the period, and this year’s exceptional performance in LEGOLAND Parks.
"The performance this year has benefited from a number of one-off factors and whilst we remain positive on the outlook for 2015, our expectations remain unchanged."
