Samsung’s weaker than expected earnings underline investor concern that the company is falling further behind rival SK Hynix in the high-bandwidth memory chips used in AI hardware.

Samsung said in its third-quarter earnings report that it was making progress in its efforts to supply high-bandwidth memory chips to Nvidia, but it has not provided any updates since the. The ongoing delay appears to have put a big dent in its earnings, analysts told Reuters.

Samsung Electronics released on Wednesday a fourth-quarter operating profit estimate that missed analyst estimates by a large margin, as it lagged behind rival SK Hynix in supplying high-end chips to Nvidia.