Archipelago Learning, which provides subscription-based online education services for students K-12, announced terms for its IPO on Monday. The Dallas, TX-based company plans to raise $100 million by offering 6.3 million shares at a price range of $15.00 to $17.00. At the mid-point of the proposed range, Archipelago Learning will command a market value of $400 million. Archipelago Learning, which was founded in 2000 and booked $42 million in sales over the last 12 months, plans to list on the NASDAQ under the symbol ARCL. BofA Merrill Lynch, William Blair, and Robert Baird are the lead underwriters on the deal, which is expected to price next Thursday, Nov. 19.