BERLIN, June 5 (Reuters) - Investor Nordic Capital will sell Sunrise Medical to U.S. investment firm Platinum Equity, ending the German wheelchair maker's plans to seek a listing on the Frankfurt Stock Exchange.

Sunrise had said last week that it plans to list its shares in a private placement over the next few months to reduce debt and as Nordic seeks to reduce its holding in the company.

The Scandinavian investor will now sell the entire company to Platinum Equity for an undisclosed price, according to statements from all three parties on Wednesday.

Completion of the transaction is expected in the third quarter and is subject to customary regulatory approvals.

"We are delighted to welcome Platinum Equity as our future shareholder, which will enable us to continue innovating and growing with the support of private capital," said Sunrise Medical CEO Thomas Babacan, who will remain on board under the new owner.

Sunrise Medical has been owned by Nordic Capital since 2015, which bought the company from financial investor Equistone. (Reporting by Alexander Huebner, writing by Miranda Murray, editing by Christopher Cushing and Thomas Seythal)