Prem Watsa's position in Merck & Co is currently worth $15.7 Million. That's 0.43% of their equity portfolio (18th largest holding). The first Merck & Co trade was made in Q4 2009. Since then Prem Watsa bought shares three more times and sold shares on one occasions. The stake costed the investor $13.7 Million, netting the investor a gain of 14% so far.