Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Apache (APA) upgraded to Buy from Hold at Stifel with analyst Michael Scialla saying the discovery of oil in offshore Suriname and condensate in two main intervals confirms two of seven play types the company expects to test on its 1.4 million-acre Block 58. 2. Occidental Petroleum (OXY) upgraded to Buy from Neutral at Mizuho with analyst Paul Sankey saying he believes the "worst is behind the company" and sees an "increasing line of sight" for sustainable dividend growth in 2022 and beyond. 3. PPL Corp. (PPL) upgraded to Buy from Neutral at Guggenheim. 4. CommScope (COMM) upgraded to Buy from Neutral at BofA with analyst Tal Liani saying he sees the risk/reward skewed to the upside. 5. Ciena (CIEN) upgraded to Overweight from Equal Weight at Morgan Stanley with analyst Meta Marshall saying she sees the company having multiple levers it can pull to achieve 20% earnings growth. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.