Swedish financial technology unicorn Klarna Bank AB (publ) raised $460 million in its latest funding round to up its valuation to $5.5 billion — becoming Europe's most valuable private fintech company.

Investors included Dragoneer Investment Group LLC, Commonwealth Bank of Australia and funds managed by BlackRock Inc.

The company intends to use the funds to fuel its U.S. expansion where its customer base is growing at a rate of 6 million users per year. Additionally, as part of the fundraising, the fintech firm will expand operations to Australia and New Zealand in partnership with the Commonwealth Bank of Australia.

Klarna CEO Sebastian Siemiatkowski told the Financial Times that the company was examining the possibility of an IPO but it is mainly focused on the company's growth and no formal decision has been made on the matter yet. He added that Klarna has most of the prerequisites for an IPO in place but it is "more of a question of timing and focus."

"Retail is becoming global. Even the smallest companies are selling to multiple geographies. The more markets we cover the better," the CEO told the newspaper.

U.K.-based Numis Corporation served as exclusive financial adviser and placement agent on the fundraising for the Swedish fintech unicorn.