Bakkt (NYSE:BKKT) stock gives back some of the three-fold gain it made in Monday's trading, falling 19% at midday New York time. Still, the stock is up ~180% over the past five days (see chart below), with almost all of that gain achieved yesterday when the company announced agreements with Mastercard and Fiserv that's expected to increase consumers' access to cryptocurrency. Bakkt (BKKT), majority owned by Intercontinental Exchange (NYSE:ICE), became a publicly traded stock on Oct. 18 after combining with Victory Park's SPAC, VPC Acquisition Holdings.