InsiderFlow › Guides › How to Follow Warren Buffett's Investments
The world's most famous investor's portfolio is public by law: every quarter, Berkshire Hathaway's 13F reveals every US stock it owns. Here's how to use it.
Berkshire's 13F lands within 45 days of each quarter's end on the SEC database. Media analyze it within hours; InsiderFlow tracks it and explains every move. Watch for confidential treatment too: when Berkshire is accumulating a big position, it can ask the SEC to keep it secret for a few quarters.
Berkshire buys rarely and holds long: every new position is a thesis weighed for years. Partial sales can be liquidity management; complete exits are the true negative signal. And the cash level — historically above $100 billion when markets are expensive — is itself an indicator of his judgment on valuations.
Academic studies on copy-trading Berkshire's 13Fs show surprisingly good results even buying 45 days late, precisely because his positions last decades. But copying without understanding stays fragile: the real value is learning the method — understandable businesses, competitive moats, reasonable prices, patience.
The annual shareholder letters (free on Berkshire's site) and the Omaha meetings are his true legacy: fifty years of investing lessons in plain language.