Warren Buffett's position in American Express is currently worth $46.4B. That's 12.97% of their entire equity portfolio (3rd largest holding). The investor owns 22.26% of the outstanding American Express stock. The first American Express trade was made in Q4 1998. Since then Warren Buffett bought shares nine more times and sold shares on nine occasions. The stake costed the investor $8.42B, netting the investor a gain of 451% so far.
Domino's Pizza is a dominant pizza franchise trading at a cheap price. Chubb is a major global insurer that is right up Buffett's alley.
Buffett didn't hold Amex for decades by accident. The business model is simpler (and stronger) than it looks.