Hedge funds Taconic Capital Advisors and Perry Capital have a smaller presence, with ownership of almost 1.2% and about 1.1%, respectively.

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After graduating she went to work for Richard Perry's hedge fund firm, Perry Capital, where she helped open a London office.

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Matt Perry of Wachovia Capital Markets noted that the managed-care and pharmacy-benefit-management sectors are no strangers to government investigations, but he said he could not recall any that involved an FBI search.

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Gingrich and Perry are proposing to eliminate the capital gains tax for everyone.

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Former House Speaker Newt Gingrich, Rep. Ron Paul of Texas and Texas Gov. Rick Perry all want to eliminate all taxes on long term capital gains, while former Pennsylvania Sen.

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Mr. Santorum has so far refused to join rivals Rick Perry and Newt Gingrich in attacking Mitt Romney's business career at Bain Capital.

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He would also repeal the alternative minimum tax and reduce taxes on capital gains and dividends to 12% but not eliminate them as Perry, Gingrich, and Huntsman would.

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