By Anupreeta Das 

Warren Buffett mounted a spirited defense of Berkshire Hathaway Inc.'s conglomerate structure, in his 50th letter to shareholders, and made the case that the company is well-positioned to survive without him and his partner Charlie Munger.

Reiterating many of his favorite themes, Mr. Buffett talked about why Berkshire makes sense as it is currently structured--the centrality of what he termed Berkshire's "special culture" to its economic health and the value of being a conservative player. He also said that diversification was key to Berkshire's profitability.

Berkshire released the letter from its chairman on Saturday morning, along with its fourth-quarter and annual earnings report. Since 2015 marks the 50th year of Berkshire under the control of Mr. Buffett, 84, and his right-hand man Mr. Munger, 91, the duo each wrote sections reviewing Berkshire over the past five decades and laying out their vision for the future. Mr. Munger typically doesn't write letters to Berkshire shareholders.

In addition to his annual letter for 2014, Mr. Buffett added a section called "Berkshire -- Past, Present and Future." He traced Berkshire's formation and early history, including acquisitions that didn't work out. He paid tribute to Mr. Munger, who has been Mr. Buffett's partner throughout his adventures at Berkshire. "The blueprint [Charlie] gave me was simple: Forget what you know about buying fair businesses at wonderful prices; buy wonderful businesses at fair prices."

In defending Berkshire's existing conglomerate structure, Mr. Buffett said that if used judiciously, it "is an ideal structure for maximizing long-term capital growth," while noting conglomerates have a bad reputation with investors that is richly deserved.

A conglomerate such as Berkshire can move huge sums of money from one business to another without incurring taxes and doesn't have what he called "historical biases" associated with being in one industry. Also, Berkshire can buy pieces of attractive companies because it is a holding company for both operating businesses and stocks, an option not available to most company managements, Mr. Buffett wrote.

He said Berkshire wouldn't spin off any businesses voluntarily because it makes no sense. However, regulators might force the company to do so, as in the past.

Mr. Buffett said Berkshire, with its clutch of diverse businesses, would continue to look for acquisitions and has evolved into an alternative for a family business deciding to sell.

While rival purchasers might try to wring out synergies, and private-equity firms are likely to load the company up with debt and sell it down the road, Berkshire provides a permanent home where the company's people and culture will be retained, he said. "Some sellers don't care about these matters. But, when sellers do, Berkshire does not have a lot of competition."

In a final section, he wrote about the next 50 years. He discouraged investors from buying Berkshire for the short term, instead suggesting they hold the stock for at least five years for a reasonable return. Berkshire, with its huge cash pile, would be unlikely to face financial problems in the future. However, he said long-term gains for the conglomerate "will not come close to those achieved in the past 50 years. The numbers have become too big."

Mr. Buffett also explored the likelihood of a dividend being paid in the next 10 to 20 years, when Berkshire might reach a point where its management won't be able to "intelligently reinvest" all of the company's earnings. Berkshire to date hasn't paid a dividend.

"All told, Berkshire is ideally positioned for life after Charlie and I leave the scene," he wrote. "We have the right people in place--the right directors, managers and prospective successors to those managers. Our culture, furthermore, is embedded throughout their ranks. Our system is also regenerative."

Write to Anupreeta Das at anupreeta.das@wsj.com

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