** GMS shares GMS.N jump 23.4% to $99.95 premarket, above QXO's buyout offer of $95.20/shr
** QXO QXO.N up 4.6% premarket, after its $5 bln bid
** New building-products distributor QXO threatens to go hostile if its offer is rejected
** Median PT of 8 brokerages covering GMS is $95 - LSEG data
** Stock last traded at $90-$100 in first half of Dec 2024
** It has fallen 4.5% this year through Wednesday's close
** QXO has jumped 41% YTD; it clinched an $11 bln deal to buy Beacon Roofing Supply in March
(Reporting by Anshuman Tripathy)