Catch up on today's top five analyst upgrades with this list compiled by The Fly: 1. Costco (COST) upgraded to Buy from Neutral at Goldman with analyst Matthew Fassler saying the company has "high-visibility catalysts" in 2017 and raising his price target for the stock to $175 from $169. 2. Sabra Health Care (SBRA) upgraded to Buy from Neutral at SunTrust with the firm saying that the company's balance sheet is strong after several transactions it made, while its "underlying portfolio" has performed well and it should benefit from the 2.1% fiscal 2017 Medicare rate increase. 3. Charter (CHTR) upgraded to Strong Buy from Outperform at Raymond James with analyst Frank Louthan arguing that he sees the recent pullback in Charter shares as an attractive buying opportunity. He raised estimates for 2017 as he believes synergies from its Time Warner Cable and Bright House acquisitions will materialize sooner. 4. Whole Foods (WFM) upgraded to Outperform from Neutral at Credit Suisse with analyst Edward Kelly saying the 50% decline in shares from the peak provides an attractive entry point. 5. Interxion (INXN) upgraded to Outperform from Market Perform at Wells Fargo with analyst Jennifer Fritzsche seeing "strong visibility" into near-term growth as well as a "favorable" relative valuation at current share levels. This list is just a portion of The Fly's full analyst coverage. To see The Fly's full Street Research coverage, click here.