Shares of Bakkt Holdings Inc. , the digital asset marketplace that was launched in 2018 by Intercontinental Exchange /zigman2/quotes/209108507/composite ICE +2.41% , fell on Monday in its first day trading, down around 2%. Its debut on the ICE-owned NYSE marks the consummation of its merger with special purpose acquisition corp, or SPAC, VPC Impact Acquisition Holdings , which it combined with in a deal with an enterprise value of about $2.1 billion. SPACs are companies that raise funds by going public and then acquire a business or businesses. VPC is backed by Chicago-based Victory Park Capital. Bakkt is headed Gavin Michael who was head of technology for Citigroup Inc.'s /zigman2/quotes/207741460/composite C +0.61% global consumer bank.