ConforMIS (Bedford, Mass.) began trading Wednesday (NASDAQ: CFMS) at $18 on a volume of 5,711,675 shares, after pricing its IPO of 9 million shares of common stock at $15 a share, the middle of the expected $14 to $16 range, fetching roughly $135 million. Shares jumped to a high of $20.42 (a 36% jump over the IPO price) and closed Wednesday at $19.25.