Companies Amazon.com, Inc. (AMZN), Apple Inc. (AAPL) Don’t Pose a Threat to Sirius XM Holdings Inc. (SIRI), Says Miriam GottfriedBy Solon Harmony B. DolorJune 2, 2014 Amazon.com, Inc. (NASDAQ:AMZN) and Apple Inc. (NASDAQ:AAPL) do not pose a big threat to Sirius XM Holdings Inc. (NASDAQ:SIRI), Miriam…