Investors are awaiting Berkshire Hathaway Chairman Warren Buffett’s annual investor letter, in which he typically expounds on Berkshire’s performance along with anecdotes and vignettes about investing and life.

The Oracle of Omaha has $180 billion collectively invested in four brand-name companies with well-defined competitive advantages and phenomenal capital-return programs.

Warren Buffett turned a $40 billion Apple investment into $150+ billion, marking his most profitable investment ever. Learn the key principles behind this success and how they apply to all investors,