Abu Dhabi investment fund Mubadala said on Thursday it is raising its stake in The Carlyle Group by $500 million to expand product offerings to the US group's investors.

Mubadala, which took a 7.5 per cent stake in Carlyle in September 2007, will get in return a combination of convertible subordinated notes and additional equity in Carlyle, according to a statement from Mubadala.

'We are confident in Carlyle's ongoing success as a global alternative asset manager and are pleased to support their strategic initiatives, including product and geographic expansion,' Mubadala chief executive Khaldoon al Mubarak said in the statement.

The two firms have collaborated across a number of industry sectors since the initial investment in 2007, identifying investment opportunities in the Middle East and North Africa.

The partnership has also collaborated in healthcare, aerospace and technology.

Goldman Sachs acted as financial advisor to Mubadala while JP Morgan Securities served as Carlyle's financial advisers.-Reuters