Wellth, a digital health company utilizing behavioral economics to empower people to prioritize their health, announced an oversubscribed Series B fundraising round of $20 million. The round was led by SignalFire, with participation from Frank Williams, Co-Founder and Former CEO of Evolent Health (also joining Wellth as Chairman of the Board), and existing investors The Social Entrepreneurs' Fund, CD Venture, Yabeo and Partnership Fund for NYC.