Every month the Nilson Report publishes a snapshot of the stock market performances of 137 companies that earn all or a significant portion of their revenues from customers in the payment card industry. Among that group, the 41 payment processors that were publicly traded for the full year are shown here. Those processors are headquartered in 18 countries and territories. Their stocks trade on 11 different exchanges. Collectively, those 41 companies held a combined market capitalization of $420.66 billion in January 2023. That figure declined 8.0% to $387.09 billion by the end of the yea...