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Buffett’s Berkshire Hathaway Discloses National Oilwell Stake

Berkshire Hathaway Inc. took a stake in National Oilwell Varco Inc. as billionaire Chairman Warren Buffett made more funds available for the portfolios managed by deputy stock-pickers.

Buffett’s firm held 2.84 million shares of oilfield equipment-maker on June 30, his Omaha, Nebraska-based company said today in a filing disclosing U.S. stockholdings at the end of the second quarter.

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