Imagination Technologies was under pressure after the company said operating profit for the year will be below previous expectations, as it posted a wider first half loss amid a slowdown in the semiconductor market. For the year to the end of October, the group, whose chips are used in Apple devices, reported a pre-tax loss of A 22.7m from A 10.7m in the same period last year as revenue dropped to A 71.1m from A 82.2m.