Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Western Digital (WDC) upgraded to Overweight on NAND strength at Morgan Stanley with analyst Wamsi Mohan citing better industry trends in both hard disk drives and memory. 2. Check Point (CHKP) upgraded to Equal Weight from Underweight at Barclays with analyst Saket Kalia saying accelerating billings growth in the double digits suggests the company's market position is strengthening. 3. Align Technology (ALGN) upgraded to Outperform from Neutral at Baird with analyst Jeff Johnson citing its many growth levers and many data points suggesting a new level of acceptance for clear aligner therapy. Johnson said the company's revenue acceleration feels like it has staying power, suggesting the stock could trade in historical ranges reserved for preeminent medtech growers. Johnson raised his price target to $155 from $105 on Align Technology shares. 4. Trimble (TRMB) upgraded to Buy from Neutral at Dougherty with analyst Jon Fisher citing the inflection in revenue, earnings beat, and second quarter outlook for growth. 5. United Rentals (URI) upgraded to Buy from Neutral at BofA/Merrill with analyst Ross Gilardi saying pieces are in place for a seasonal rate improvement. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.