Activist investor Carl Icahn on June 19 won a battle for control of SandRidge Energy Inc. (NYSE: SD), winning at least four of seven seats on the board of the U.S. shale producer that he wants to sell.

Shareholders elected four of Icahn's seven-person slate and two nominees put forth by the Oklahoma City, Okla.-based oil and gas company, according to preliminary results.

The final director's position was too close to call, a company spokesman said.

The company's poison pill and executive compensation plan were rejected by shareholders, another victory for Icahn, who had urged a 'no' vote for both.

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Icahn, who owns a 13.6% stake in the company, launched a fight for control of the board this year, arguing directors overpaid company executives, signed off on a costly deal that was later withdrawn, and failed to pursue a February takeover proposal.

Shares in SandRidge were up 3% at $16.30 in morning trading. The stock has slipped 24% so far this year.

Icahn was unavailable for immediate comment, a spokeswoman said, and a representative of the billionaire investor attending the meeting declined to comment.

SandRidge's former CEO and CFO were ousted earlier this year as Icahn criticized management, and its board said it would conduct a strategic review that included a sale of some or all of the company.

The company expanded its board, offering two new seats on it to the billionaire investor, but Icahn said he did not trust the existing board to manage a sale and nominated his own slate to replace them.

SandRidge had argued Icahn wants to gain control of the company on the cheap by disrupting its directors' review of a sale of assets or the entire company.

Institutional Shareholder Services and Glass Lewis & Co., two firms that issue proxy recommendations, each backed four of SandRidge's board nominees. Both urged holders to vote against the company's poison pill and its executive compensation plan.

Last year, 52% of SandRidge shareholders who voted cast ballots in favor of the executive compensation plan.

Icahn last year challenged SandRidge's $746 million deal for rival Bonanza Creek Energy Inc. (NYSE: BCEI), forcing it to back away from a purchase he called too expensive and designed to benefit the company's management at the expense of shareholders.

Shareholders elected Jonathan Christodoro, John Lipinski, Bob Alexander and Randolph Read from Icahn's slate. They also approved existing SandRidge directors Sylvia Barnes and William Griffin Jr.