Berkshire buys more Alphabet, which becomes its third-largest stock investment

Berkshire Hathaway said on Friday it boosted the size of its investment in Alphabet by 83% in the second quarter, making the parent of Google and YouTube its third-largest stock holding.

Berkshire said in a regulatory filing that it owned nearly 106 million Alphabet shares worth about $37.8 billion as of June 30, up from 57.8 million shares three months earlier.

The increase was disclosed in a filing describing Berkshire's U.S.-listed stock holdings as of June 30, which comprised most of its $323.8 billion equity portfolio.