Merlin expects to raise £200m via a primary offer and an undisclosed sum via a secondary offering.
The company said it will use the IPO proceeds to reduce its debt pile, which currently stands at over £1.2bn. It also revealed that its private equity owners CVC and Blackstone will sell part of their stakes.
Last year Merlin saw revenues rise 15.4 per cent to over £1bn, while operating profits climbed 16.5 per cent to £258m.
Private equity firm Apax partners created Merlin by backing a £57m management buyout of Vardon Attractions in 1998.
Hermes Private Equity bought the company for £72.5m in 2004 before selling it to Blackstone for £102.5m a year later.
Dubai International Capital, CVC Capital Partners and Danish family trust Kirkbi, which owns Lego, have since bought stakes in the business.
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