Mario Gabelli's position in Sony . - ADR is currently worth $190 Million. That's 2.18% of their equity portfolio (2nd largest holding). The first Sony . - ADR trade was made in Q1 2001. Since then Mario Gabelli bought shares 26 more times and sold shares on 41 occasions. The stake costed the investor $34 Million, netting the investor a gain of 458% so far.