Shares in GlaxoSmithKline tracked the market higher after it completed £13bn of asset swaps with Novartis that will unlock a £4bn windfall for investors.
GSK will receive just over £5bn, which will allow it to make the payout.
At the moment, the British firm expects to return the cash via the issue of new B shares in the business which will then be bought back.
It has taken almost a year to get the transaction to completion.
GSK will announce first quarter results on May 6 at which point it will provide guidance on 2015 earnings, which so far been delayed.
Share in the company, down around 7.5% in the last year, rose 6.82p to 1,548.32p in early trade.