UK's Mondi shares down after paper grade price hikes
** Shares of Paper and packaging firm Mondi PLC MNDI.L fall 6.5% at 764.2 p -- stock is top loser among mid-caps .FTMC
** Co hikes prices across several paper grades to offset higher energy and input costs, with benefits expected from late 2026 into 2027
** YTD, stock has fallen 10%