ARM Holdings (NASDAQ:ARMH) CEO Warren East will retire on July 1 after 12 years in the job and be replaced by company President Simon Seagars, who joined ARM in 1991. East has transformed Arm as CEO, taking it from a company with one processor product line found mainly in mobile phones to a firm with a broad portfolio and 300 semiconductor customers. Arm shares are -0.9% in London. (PR)