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The 73-year-old vice chairman of insurance operations sold 200 Berkshire Class A shares on Monday for roughly $139 million.

"It's been a matter of a well thought out strategy prosecuted for seven decades with discipline, consistency, and unusual insight," Oaktree's Howard Marks said.

The conglomerate joined a small club of companies that have crossed the mark.

Berkshire Hathaway reached an exclusive territory Wednesday that in the US currently includes just six other companies — all from the tech world.

The milestone came two days before Buffett's 94th birthday.