At Cash Flow Club , we focus on businesses with strong cash generation, ideally with a wide moat and significant durability. When these companies are bought at the right time, that can be highly rewarding for us. If you are interested in joining our community, start right here !Berkshire Hathaway's ( BRK.A )( BRK.B ) most recent 13F disclosure shows that the company bought a stake worth more than $1 billion in health insurance giant UnitedHealth (NYSE: UNH ). The market reacted positively to this news, as t ...