Warren Buffett acquired 3.99 Million Mastercardrporated shares worth $1.33 Billion. That's 0.44% of their equity portfolio (20th largest holding). The first Mastercardrporated trade was made in Q1 2011. Since then Warren Buffett bought shares six more times and sold shares on seven occasions. The stake costed the investor $865 Million, netting the investor a gain of 53% so far.