NEW YORK, Feb 13 (Reuters) - Standard & Poor's on Friday raised its ratings on Amazon.com Inc (AMZN.O: Quote, Profile, Research) to investment grade, citing the online retailer's earnings growth.

S&P raised Seattle-based Amazon.com two notches to "BBB," the second-lowest investment grade, from "BB-plus." The outlook is stable, indicating an additional rating change is not anticipated over the next one-to-two years.

"The upgrade to an investment-grade rating reflects Amazon.com's strong brand, robust performance, and improved credit protection metrics," S&P analyst David Kuntz said in a statement.

"The company has maintained solid performance during this especially difficult retailing environment," S&P added.

Moody's Investors Service said in January it may raise Amazon's ratings to investment grade after the retailer reported its best holiday sales season yet. For details, see [ID:nN13454279] (Reporting by Karen Brettell; Editing by Dan Grebler)