Berkshire Hathaway Chairman, Mr. Buffett, sends an annual letter to all of its shareholders and he has been doing this every year since 1977.
The letter is very informative and Warren Buffett don't forget to highlight his mistakes in the letter (if any), which is a part of a leadership style that has helped him build a company with 270,000 workers and draw crowds of more than 20,000 to hear him speak during annual general meeting. “A friend once asked me: If you’re so rich, why aren’t you smart?” Warren Buffett, said in a letter accompanying the 1996 annual report.
If you are looking to read some or all of those letters then use the link to download them in PDF format: