
Shares of BP BP.L up 5.6% at 457p - top gainer on FTSE 100 index .FTSE
Activist investor Elliott Investment Management has built a stake in the oil major, a source familiar with the matter told Reuters
Size of the stake is unknown
In a report from Saturday, Bloomberg News called Elliott's stake in the company "significant"
Elliott is seeking to boost shareholder value by urging BP to consider transformative measures, Bloomberg News reported
BP gains ~16% YTD