Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Medtronic (MDT) upgraded to Overweight from Neutral at JPMorgan with analyst Robert Marcus saying that over the past year he's seen a "significant turnaround in performance" at Medtronic. 2. Masimo (MASI) upgraded to Overweight from Neutral at Piper Jaffray with analyst William Quirk saying management, during recent meetings, was upbeat about their near- and longer-term prospects of driving 8%-10% sales growth, at least 100 basis points of operating margin improvement and the company's 30% operating profit goal. 3. Darden (DRI) upgraded to Buy from Hold at Maxim and to Buy from Neutral at BTIG. 4. Best Buy (BBY) upgraded to Neutral, risks priced in, says MoffettNathanson with analyst Greg Melich saying sales and margin risks are reflected in valuation. 5. General Electric (GE) upgraded to Buy from Hold at Vertical Research. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.