Guy Spier's position in American Express Co. is currently worth $33.3 Million. That's 17.38% of their entire equity portfolio (2nd largest holding). The first American Express Co. trade was made in Q4 2014. Since then Guy Spier bought shares one more times and sold shares on three occasions. The stake costed the investor $16.7 Million, netting the investor a gain of 100% so far.