Asian investors Tal Education and EDBI added $10m to the $42.3m series F round initially closed by Pearson-backed learning materials provider Knewton in November.

China-based educational services company Tal Education and EDBI, the investment arm of Singapore Economic Development Board, have invested in US-based adaptive learning technology provider Knewton, enabling it to close a $52.3m series F round on Tuesday.

The round was co-led by diversified holding company Sofina and venture capital firm Atomico.

FirstMark Capital, Founders Fund, Accel Partners and Bessemer Venture Partners contributed funds to the $42.3m first close in November 2015. Knewton has not clarified if any of them returned…