Siemens AG, the German engineering conglomerate, is readying the most significant step yet in its years long restructuring: the listing of a big chunk of its health-care business, estimated to be worth up to $47 billion.  Siemens isn’t likely to set the exact size of the IPO yet but is targeting listing a slice of between 15% and 25%… The company has said it wants to launch the offering by the middle of next year.

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