Tom Russo acquired 2.13 Thousand Berkshire Hathaway shares worth $1.34 Billion. It makes up 13.56% of their stock portfolio and is their biggest holding. The first Berkshire Hathaway trade was made in Q1 1999. Since then Tom Russo bought shares 33 more times and sold shares on 45 occasions. The stake costed the investor $248 Million, netting the investor a gain of 441% so far.