Files for $50 Million Inc., a Waltham, Mass.-based provider of on-demand compensation management solutions, has filed for a $50 million IPO. It plans to trade on the Nasdaq under ticker symbol SLRY, with Thomas Weisel Partners and William Blair & Co. serving as co-lead underwriters. It raised around $4 million in VC funding from groups like Lyric Capital in 2000 and 2001.