Aven, a fintech startup known for its home-equity-backed credit cards, has raised $110 million in Series E financing at a$2.2 billion post-money valuation. The San Francisco-based company is one of a growing number of startups focused on helping U.S. consumers take advantage of the estimated $35 trillion in wealth tied up in their homes. Most Read from Fast Company The latest round was led by Khosla Ventures, with participation from existing backers General Catalyst, Caffeinated Capital, GIC, Electric C ...