Revolut, a London-based financial app, is aiming to sell at least $750 million worth of shares in a secondary sale set to kick off next week, with the total potentially pushing far higher amid early signs of strong investor demand, according to a person with knowledge of the discussions.

There is already enough investment interest to increase the size of the offering to $2 billion, the person said, though the final amount sold will depend on how many employees and early shareholders are willing to sell their stock at the proposed $109 billion valuation. The number rises to a $115 billion valuation, if accounting for potential dilution from stock options.