GlaxoSmithKline and GlaxoSmithKline Consumer Nigeria PLC have reached an agreement under which GSK would increase its ownership in the company from 46.4% to 80%. GSK would acquire approximately 321 million shares in a transaction valued at approximately $99.4 million. GSK has also initiated an offer to increase its stake in its Indian subsidiary, GSK Consumer Healthcare Ltd., from 43.2% to as much as 75%. That offer, which is subject to the rules of the Securities and Exchange Board of India, wi...