Online marketplace Alibris is acquiring Monsoon, an Oregon-based marketplace selling solutions company, for a combination of cash and stock in Alibris Holdings. Monsoon will continue to run as a separate operating company led by Kanth Gopalpur and the Monsoon senior management team. Combined, Alibris and Monsoon managed more than $400 million of book, music, movie, and videogame sales for its sellers in 2009.

According to the Monsoon website, it actively manages over 20 million unique listings at any given time, and offers support for eBay, Amazon, and other primary marketplaces in the US and UK.

Alibris Holdings President and CEO Brian Elliott said, "We are excited to be working even more closely with Monsoon. Alibris has been focused on driving sales for our network of more than 15,000 independent sellers through Alibris-branded marketplaces and by providing marketplace functionality to leading book, music, and movie retailers. Monsoon provides best-in-class tools and services for sellers listing across multiple marketplaces. We believe that this merger will provide our sellers with unparalleled marketplace exposure, and further opportunities for growth."

Oak Hill Capital, a private equity firm that acquired Alibris Holdings in 2006, provided funding for the transaction along with additional bank financing from Square 1 Bank.