By John Kell 

Amazon.com Inc. agreed to acquire digital-comics provider comiXology, scooping up an app that has been a top-grossing performer on the iPad in recent years.

Terms of the deal, which is expected to close in the second quarter, weren't disclosed.

ComiXology, founded in 2007, has a collection of digital comic books from over 75 publishers, as well as independent creators. The New York-based company said it was among the 10 highest-grossing iPad apps in 2011 and 2012, and the top grossing nongame iPad app the last two years.

Amazon's move to acquire comiXology comes as the company aims to bolster its offerings beyond its original online retailing business. Amazon has a slate of tablets under the Kindle Fire brand, and offers thousands of movies and television shows as an add-on to its Prime shipping membership program. Last year, the e-commerce giant bought book recommendation site Goodreads.

Shares of Amazon were up 1.5% to $321.75 in after-hours trading. It closed the regular session down 4.4%, falling with the broader market.

Write to John Kell at john.kell@wsj.com

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