What is Coinbase backed by?

Could you elaborate on the backers and investors supporting Coinbase, a leading cryptocurrency exchange? I'm curious to know the financial institutions, venture capital firms, or private equity groups that have invested in or partnered with Coinbase to facilitate its growth and expansion in the cryptocurrency market. Understanding the backers of such a significant player in the crypto sphere can provide insights into the industry's trends, as well as the financial resources and credibility that Coinbase possesses. I'd appreciate any insights you could share regarding the specific backers of Coinbase.