
Many investors watch what Warren Buffett is buying, and tracking regular 13F filings from his iconic investment manager Berkshire Hathaway (BRK.B) is a simple way to do so.
These quarterly reports to the Securities and Exchange Commission (SEC) require disclosures of buys and sells by institutions that manage more than $100 million, such as mutual funds, hedge funds, pension funds, registered investment advisors and insurance companies.