Warren Buffett's annual letter to Berkshire Hathaway shareholders will be released Saturday morning.

The letter is generally one of the best-read and most-quoted business documents every year because Buffett mixes sage advice with the financial results for his Berkshire Hathaway conglomerate.

Investors will be looking for clues about what companies or stock Berkshire might buy next and who will lead the company after the 81-year-old Buffett departs.

Buffett's letter and the 2011 annual report for his Omaha-based company will be posted online at www.berkshirehathaway.com on Saturday morning.

Berkshire owns roughly 80 subsidiaries, including clothing, jewelry and corporate jet firms, but its insurance and utility businesses typically account for more than half its net income. It also has major investments in such companies as Coca-Cola Co. and Wells Fargo & Co.