shares of brigham minerals inc jumped in premarket trading tuesday after the wall street journal reported that the company is set to announce a deal to combine with sitio royalties corp in a stock swap that would form one of the largest publicly traded mineral and royalty companies in the us sitio shareholders would own about 54 of the combined company while brigham investors would own the remaining 46 the journal reports citing people familiar with the matter sitio shares which closed friday at 2522 slipped 17 to 2480 in premarket trading tuesday while shares of brigham which ended fridays session at 2940 rose 88 to 32 before trading in both companies was halted