Last week on Thursday 12th Jan, GlaxoSmithKline paid its dividend to its shareholders.
It was 19p a share.
The total number of voting rights in the Company is 4,910,110,112
http://www.londonstockexchange.com/exchange/news/market-news/market-news-detail/GSK/13083316.html
So the cost of the dividend to GSK was:
4,910,110,112 * £0.19 = £932,920,921.28
That is £932 Million of Cash.
http://www.shareshop.hsbc.co.uk/shareshop/security.cgi?csi=10042
That is a 5% yield.