Mario Gabelli's position in Sony . - ADR is currently worth $154 Million. That's 1.66% of their equity portfolio (6th largest holding). The first Sony . - ADR trade was made in Q1 2001. Since then Mario Gabelli bought shares 27 more times and sold shares on 46 occasions. The stake costed the investor $27.6 Million, netting the investor a gain of 458% so far.