Shares of Amazon.com (AMZN) are down $8.11, or almost 3%, at $266.99, after J.P. Morgan’s Doug Anmuth cut his rating on the shares of Neutral from Overweight, after trimming his estimates, arguing that the company’s gross profit is facing “material deceleration” this year, as third-party sales “moderate” and the company faces tougher comparisons. Amazon’s “gross [...]