The mobile payment technology company has already raised $340m in equity funding from investors including Visa, Citi and Starbucks.

US-based mobile payment company Square is in the process of raising up to $200m in new funding at a valuation of $2bn, CNBC reported on Tuesday, citing sources familiar with the matter.

The round is likely to include sovereign wealth fund Government of Singapore Investment Corporation, though it has not been disclosed whether existing investors including financial services firm Citi, coffee retailer Starbucks and payment services firm Visa will participate.

Founded in 2009, Square produces a range of hardware and…