Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Teva (TEVA) upgraded to Neutral from Underperform at Mizuho with analyst Irina Koffler citing reduced near-term risk of a Mylan's (MYL) generic Copaxone approval, potential asset sale announcements, and encouraging May subscription trends. 2. Brookfield Infrastructure (BIP) upgraded to Outperform from Neutral at Credit Suisse with analyst Andrew Kuske saying the potential inclusion of Brookfield Infrastructure into the S&P Index is likely to have a "meaningful impact" on demand around the third quarter index revision. 3. Celgene (CELG) upgraded to Outperform from Market Perform at Leerink with analyst Geoffrey Porges saying he views Celgene's valuation as "discounted." 4. Regency Centers (REG) upgraded to Buy from Hold at Jefferies with analyst George Hoglund saying he believes the recent pullback in the shares creates an attractive entry point. 5. Nanometrics (NANO) upgraded to Buy from Hold at Stifel with analyst Patrick Ho citing valuation, along with his belief that wafer lab equipment spending will be strong next year and that the "elevated spending" level may be sustainable. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.