Despite its early lead in the fast-growing e-book market, Amazon.com Inc. (AMZN) faces growing competition from tech giants Google Inc. (GOOG) and Apple Inc. (AAPL), according to one analyst.

Marianne Wolk of Susquehanna downgraded Amazon to a neutral rating on Monday. In a note to clients, the analyst cited “intensifying competition” in the e-book market, which is creating more uncertainty around the company’s Kindle business. Get the full story »