Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Coca-Cola (KO) upgraded to Overweight from Equal Weight at Barclays with analyst Lauren Lieberman saying the company's transformation should drive "sustainably better growth," which should yield a higher valuation premium. 2. Valero (VLO) upgraded to Overweight from Equal Weight at Morgan Stanley with analyst Benny Wong saying recent underinvestment in refining, slippages in capacity additions and overdone concerns on long-term demand have set the stage for refining to enter a "golden age" through 2020. 3. ManTech (MANT) upgraded to Outperform from Market Perform at Wells Fargo with analyst Edward Caso citing valuation. 4. Celanese (CE) upgraded to Buy from Neutral at UBS with analyst John Roberts saying he believes the shares are undervalued and investors do not appreciate the stability and growth in the acetyls chain and the long-term potential in Engineered Materials. 5. Canadian National (CNI) upgraded to Buy from Underperform at BofA/Merrill with analyst Ken Hoexter saying service and volume growth rebounded faster than expected and will only be aided by an improving economy. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.

JPMorgan lowered the firm's price target on Coca-Cola to $65 from $66 and keeps an Overweight rating on the shares ahead of the Q1 report. The analyst sees a favorable setup for 2024, but is more cautious on volumes in Q1 versus the Street and is not expecting a guidance raise.

Citi analyst Vikram Bagri raised the firm's price target on Valero to $192 from $160 and keeps a Buy rating on the shares. The analyst refreshed the company's model for the latest commodity prices. Valero embarked on a larger maintenance period in Q1, which should position the company well ahead of a potentially strong summer driving season, the analyst tells investors in a research note. However, Citi sees low prospects for a sharp price reaction to the Q1 print with the shares up 29% year-to-date.