Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Cognizant (CTSH) upgraded to Buy from Hold at SunTrust with analyst Frank Atkins saying immigration reform/Border-Adjusted-Tax remains a risk, but said the issues are well known and reflected in valuation. 2. NuStar Energy (NS) upgraded to Neutral from Underperform at Credit Suisse with analyst John Edwards citing the Navigator Energy Services acquisition. The analyst also raised his price target on the shares to $53 from $52. 3. SkyWest (SKYW) upgraded to Strong Buy on valuation at Raymond James with analyst Savanthi Syth telling investors the substantial decline in shares with no new information creates an attractive entry point. 4. Callon Petroleum (CPE) upgraded to Buy from Neutral at Euro Pacific with analyst Joel Musante citing the recent pullback in commodity prices, its strong balance sheet, and high quality prospects in the Midland and Delaware Basins. 5. KB Home (KBH) upgraded to Market Perform from Underperform at Raymond James with analyst Buck Horne saying he is encouraged and optimistic about first quarter demand for home builders and said corporate tax reform looks like a 2018 event, which may reduce concerns about a material impairment to KB's $7.67/share of deferred tax assets. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.

Reports Q1 revenue $804M, consensus $800.2M. Chip Childs, CEO, "Our ability to meet our partners' demand for additional production continues to increase as our captain availability has improved. We are also pleased with how our teams performed under challenging winter conditions during the first quarter."