Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Wells Fargo (WFC) upgraded to Market Perform from Underperform at Raymond James with analyst David Long saying the retirement of CEO Tim Sloan removes a "headwind." 2. Viacom (VIA, VIAB) upgraded to Buy from Hold at Loop Capital with analyst Alan Gould citing the company's loss of its biggest distributor AT&T (T) having been de-risked which, he believes, raises the likelihood of a Viacom merger with CBS (CBS). 3. F5 Networks (FFIV) upgraded to Neutral from Underweight at Piper Jaffray with analyst James Fish saying after underperforming the tech sector and the market over the last six months by ~20%, some of the main downside share catalysts have played out. 4. Mosaic (MOS) upgraded to Neutral from Underperform at Credit Suisse with analyst Chris Parkinson citing modest downside to Chinese cash operating costs, lower immediate-term ammonia and sulfur costs, evidence of near-term volume discipline, the emphasis on long-term cost reduction programs and balance sheet stability. 5. KeyCorp (KEY) upgraded to Neutral from Reduce at Nomura Instinet with analyst Bill Carcache saying he believes the shares are near a fair valuation. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.

Notable companies reporting before tomorrow's open, with earnings consensus, include Blackstone (BX), consensus 96c... Elevance Health (ELV), consensus $10.53... D.R. Horton (DHI), consensus $3.06... Genuine Parts (GPC), consensus $2.16... Snap-on (SNA), consensus $4.64... Keycorp (KEY), consensus 22c... Ally Financial (ALLY), consensus 33c... Alaska Air (ALK), consensus ($1.05).