SEATTLE--(BUSINESS WIRE)--Amazon.com, Inc. (NASDAQ: AMZN) today announced financial results for its second quarter ended June 30, 2015. Operating cash flow increased 69% to $8.98 billion for the trailing twelve months, compared with $5.33 billion for the trailing twelve months ended June 30, 2014. Free cash flow increased to $4.37 billion for the trailing twelve months, compared with $1.04 billion for the trailing twelve months ended June 30, 2014. Common shares outstanding plus shares underlyi