Analyst Maynard Um of UBS is holding onto a current buy rating for Apple stock after analyzing monthly data from NPD. US-only, the data shows Mac sales for May up 8 percent month-over-month, and up 35 percent year-over-year via about 361,000 units. Data covering April and May together shows growth of 37 percent, over UBS's 29 percent expectation in Mac growth rate for the quarter. Overall June quarter results are expected to sit between 2.9 and 3.5 million units, with a precise UBS forecast of 3.35 million.
