Shares of Amazon were gaining 0.3% to $317.50 in after-hours trading.
ComiXology is known for its Guided View feature that makes it easier to read comics on smartphones and tablets. The platform has content deals with more than 75 publishers including comic giants Marvel and DC.
More than 20 million digital comics were downloaded through the comiXology service by September 2013, and the app is consistently in Apple's (AAPL) iOS App Store top-grossing lists.
Terms of the deal were not disclosed.
"ComiXology's mission is to spread the love of comics and graphic novels in all forms," comiXology CEO and co-founder David Steinberger said in a press release. "There is no better home for comiXology than Amazon to see this vision through. Working together, we look to accelerate a new age for comic books and graphic novels."
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TheStreet Ratings team rates AMAZON.COM INC as a Hold with a ratings score of C. TheStreet Ratings Team has this to say about their recommendation:
"We rate AMAZON.COM INC (AMZN) a HOLD. The primary factors that have impacted our rating are mixed ? some indicating strength, some showing weaknesses, with little evidence to justify the expectation of either a positive or negative performance for this stock relative to most other stocks. The company's strengths can be seen in multiple areas, such as its robust revenue growth, impressive record of earnings per share growth and compelling growth in net income. However, as a counter to these strengths, we also find weaknesses including generally higher debt management risk and poor profit margins."