The mobile input technology developer plans to float in the US, two years after raising cash in an SIG-backed round.

Cootek, a China-based mobile internet technology developer backed by technology and trading group Susquehanna International Group (SIG), has filed for a $100m initial public offering in the US.

Founded in 2008, Cootek is best known for TouchPal Smart Input, an onscreen keyboard for mobile devices that generates large quantities of data on its users. It supports 110 languages and had an average of more than 125 million daily active users as of June 2018.

The company made a $3.5m…