The Italian private equity firm initially picked up a 50 per cent stake in the Spanish business in 2009, before buying the remaining 50 per cent from La Caixa for about €120m in November 2012.
Investindustrial president Andrea Bonomi told the Financial Times the deal gave the company an enterprise value of €439m.
Barcelona-based PortAventura houses 39 attractions, a water park, four hotels and a convention centre with capacity for 4,000 people.
It posted EBITDA of €59m in 2011.
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