The Oakmark Funds, a group of mutual funds that were one of Dell Inc.'s larger shareholders, sold their stake after Blackstone Group LP withdrew its potential bid for the company, Oakmark said Wednesday.

A "potential acquirer with access to non-public information decided to end its quest to acquire Dell at a higher price. Since they had information we didn't, we believed it was prudent to assume they might be right. So we sold our stock and will put the proceeds into other stocks that we are more confident are undervalued," said Bill Nygren, co-portfolio manager of the Oakmark Fund, Oakmark Select Fund and Oakmark Global Select Fund, in a statement published Wednesday morning.

Blackstone had said it was working on a bid to rival Silver Lake Partners and Michael Dell's $13.65-a-share offer to take Dell private. But it decided to end its pursuit of Dell last week, citing an "unprecedented" decline in the company's PC sales, along with its "rapidly eroding financial profile."

The Oakmark funds together owned about 24.5 million Dell shares at the end of the first quarter, according a company spokesman, or about 1.4% of Dell's shares outstanding. The shares were held in the name of Harris Associates LP, adviser to the Oakmark funds.

Harris was Dell's seventh-largest shareholder as of the end of the first quarter, according to FactSet, though that position may have changed due to trading in Dell stock. Merger arbitrage traders and activist investors, including Carl Icahn, have been buying Dell shares since the deal was announced.

"Our numbers suggested Dell should be worth a premium to the $13.65 offer from management," Mr. Nygren said.

But, he said, "we were surprised and disappointed when, after extensive due diligence of non-public information, Blackstone said that it was alarmed by Dell's rapidly deteriorating financial situation."

Dell shares were trading up 15 cents Wednesday to $13.24, below the Silver Lake deal price.

Write to Telis Demos at Telis.Demos@wsj.com

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