French electrical and digital building infrastructure group Legrand on Thursday increased its annual operating margin outlook as it reported first-half core earnings above market expectations. The group, which sells products for the commercial, industrial and residential sectors, had already raised its 2025 revenue growth forecast earlier this month, citing strong North American data centre demand. Its shares were up 4.2 per cent at 0744 GMT, having risen 35.7 per cent​ so far this year. Tech