The changes were described in a regulatory filing describing Berkshire's U.S.-listed equity investments as of June 30.

Berkshire slowed its trading in the second quarter as U.S. stock markets fell, buying $6.2 billion of stocks and selling $2.3 billion.

It had bought $51.1 billion of stocks and sold $9.7 billion in the first quarter.

(Reporting by Jonathan Stempel in New York, Editing by Franklin Paul)