Berkshire Hathaway recently filed its second-quarter 13F form, revealing its stock holdings at the end of June.

Key Takeaways Buffett has long been a big proponent of the index funds that Bogle helped bring to the masses.However, his public declaration that Bogle is an American hero may have also been influenced by the fact that one of Bogle's funds just helped Buffett win a $1 million bet.

No one can know, but here’s how to think about it.

Berkshire Hathaway's $1B+ UnitedHealth investment highlights confidence despite profit woes. Read why UNH offers attractive upside for long-term investors.

Warren Buffett’s net worth makes him 28 times richer than Donald Trump thanks to decades of savvy investing and Berkshire Hathaway's growth.