21Vianet Group, the largest carrier-neutral Internet data center services provider in China, raised the proposed deal size for its upcoming IPO on Wednesday. The Beijing, China-based company now plans to raise $156 million by offering 12.5 million shares at a price range of $12 to $13. The company had previously filed to offer 11.5 million shares at a range of $10 to $12. At the mid-point of the revised range, 21Vianet Group will raise 24% greater proceeds than previously anticipated. 21Vianet Group, which was founded in 1999 and booked $80 million in sales over the last 12 months, plans to list on the NASDAQ under the symbol VNET. Morgan Stanley, Barclays Capital and J.P. Morgan are the lead underwriters on the deal, which is expected to price during the week of April 18.