The pandemic demand boom and near-zero interest rates once sent software companies' valuations soaring. Now, the landscape is shaped by a higher cost of capital and rapidly evolving AI technology.

Yet as UnitedHealth's stock declined, Buffett's Berkshire Hathaway Inc. (BRK.B) (BRK.A) stepped in and bought 5.04 million shares, a stake valued at $1.57 billion as of June 30's close.

Western Midstream has a huge yield and a growing produced water opportunity.