It was sold by Julian Troup, head of UK hotels agency, and Alistair Letham, hotels director of commercial property specialist Colliers International, which had offered it for sale at a guide price of £7m on behalf of The Hotel Collection.
The four-star, 89-bedroom, hotel has seen eight Open Championships at the golf course since its construction at the start of the 20th century.
Charles Scudamore, principal of Hetherley Capital Partners, said: “We are obviously delighted to have acquired such a unique hotel with its own sense of identity and rich heritage. Looking at the history of the Marine Hotel, we were immediately taken by its reputation as one of the leading hotels in Scotland and more specifically the importance of the hotel to Ayrshire and its residents.
“We recognise the hotel needs investment to restore its former glory and we are committed to conducting those works as sympathetically as possible. 2016 is obviously a big year for the hotel and for the town of Troon itself and we look forward to playing our part.”
Troup said: “It has been a privilege to act on the sale of such a world-renowned property. As we expected, it attracted a huge amount of interest from both UK and international buyers when it hit the market. Its iconic position overlooking the 18th hole of Royal Troon Golf Course makes it truly unique and I've no doubt the new owners will have ambitious plans for The Marine.”