Anti-retrovirals are supplied to poor children jointly with the Children's Investment Fund Foundation of Chris Hohn, a hedge-fund boss.

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One prominent London-based hedge fund, the Children's Investment Fund, channels a large chunk of its profits into a charitable foundation.

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That deal has already come under fire from ABN's activist shareholder The Children's Investment Fund, and on Wednesday the Dutch bank said it was actively soliciting rival bids "from the largest U.S. and international banks" for the subsidiary.

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