Blocks a Larger Liberty Media Stake Rupert Murdoch , left , extended a shareholder rights plan or '' poison pill '' that blocks the largest shareholder in the News Corporation , the Liberty Media Corporation of John C. Malone , from buying more shares .
News Corporation /business/company/founders Rupert Murdoch
Rupert Murdoch /business/person/company News Corporation
John C. Malone /business/person/company Liberty Media Corporation
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News Corporation
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Rupert Murdoch
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Rupert Murdoch
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News Corporation
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John C. Malone
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Liberty Media Corporation
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