Analyst Upgrades: Amazon, Chevron, Potash Corp of Saskatchewan

Analysts are weighing in on e-commerce giant Amazon.com, Inc. (NASDAQ:AMZN), energy issue Chevron Corporation (NYSE:CVX), and fertilizer firm Potash Corporation of Saskatchewan (USA) (NYSE:POT). Here's a quick roundup of today's bullish brokerage notes on AMZN, CVX, and POT. 

• MKM Partners initiated coverage on AMZN with a "buy" rating and an $800 price target, lifting the stock 1.1% in pre-market trading. It's been a banner year for the shares, which have more than doubled in value to rest at $657.91, and earlier this month touched a record peak of $684.82. Not surprisingly, analysts have been piling on Amazon.com, Inc.'s bullish bandwagon. Of the 29 brokerage firms tracking the stock, 24 have handed out a "buy" or better opinion, with not a single "sell" rating in sight.

• CVX is a different story on the charts, losing one-fifth of its value in 2015 to trade at $89.33 amid crude oil's collapse. Nonetheless, the shares are 0.8% higher in electronic trading, with oil futures rebounding and after Cowen and Company lifted its price target to $122 from $95 -- overshadowing a $3 price-target cut to $91 at J.P. Morgan Securities. Elsewhere, option traders have blazed a decisively bearish path toward Chevron Corporation. At the International Securities Exchange (ISE), Chicago Board Options Exchange (CBOE), and NASDAQ OMX PHLX (PHLX), the equity has racked up a 10-day put/call volume ratio of 2.18 -- just 9 percentage points from a 12-month high.

• POT is up 0.9% ahead of the bell, following an upgrade to "buy" from "hold" at HSBC -- though the brokerage firm also slashed its price target to $21.75 from $24.50. The shares could use a boost, as they've tanked 17% in December to trade at $16.76, and just yesterday panned a seven-year low of $16.65. As such, the majority of the brokerage crowd is against Potash Corporation of Saskatchewan. Specifically, two-thirds of covering analysts have doled out a "hold" or worse recommendation.