Irish aircraft management group Amentum Capital Ltd has sold 25% of ownership stake to Japanese investor Financial Products Group (FPG). The financial terms of the strategic deal were not disclosed, according to The Irish Times.

Mitchell Simpson, chief financial officer of Amentum, told The Irish Times, "What they bring to the party is that they are one of the largest arrangers of Japanese equity to finance Japanese operating leases."

This is Amentum's second time to change ownership within a year. In December 2012, the managment team bought the business from German company HSH Nordbank. Basing on the company's annual accounts, HSH Nordbank had a loss of EUR1.9 million from the transaction, the report said.

According to the latest Amentum accounts, HSH Nordbank received a dividend from the aircraft manager before the buyout occured. The amount was pegged at EUR1.25 million, said the report.

Formed eight years ago, Amentum holds in management a portfolio of 26 aircrafts worth USD2 billion. The company's clients include British Airways, Emirates, Air France KLM, and EasyJet, The Irish Time reported.