Dialog Semiconductor has said its top customer Apple could build its own power-management chips into future iPhones rather than rely on the Anglo-German chipmaker, sending its shares plunging up to 19%.

When Apple dropped Imagination Technologies as a supplier for iPhone technology, the British chip designer’s shares plunged up to 69% and the company ultimately accepted a buyout.

When Apple dropped Imagination Technologies as a supplier for iPhone technology, the British chip designer’s shares plunged up to 69% and the company ultimately accepted a buyout.

Imagination Technologies Group Plc shares plunged as much as 69% after the UK chip designer said Apple will stop using its intellectual property in new products, setting the stage for a clash with its biggest customer.