Warburg Pincus, a global private equity firm, is set to invest $400m in WEX, a financial technology service provider. Investment includes convertible notes in an aggregate principal amount of $310m and $90m in common stock. “We are pleased to further fortify our balance sheet during the current uncertain operating environment while reaffirming our relationship with Warburg Pincus, who has demonstrated their strong commitment to the future growth of WEX,” Melissa Smith, WEX Chair and Chief Executive Officer.