Lowenstein represented Altair Engineering, Inc. (Nasdaq: ALTR) in its $156 million initial public offering of Class A common stock. The shares began trading on NASDAQ Global Select Market under the ticker symbol "ALTR" on November 1, 2017. J.P. Morgan Securities LLC, RBC Capital Markets, LLC and Deutsche Bank Securities Inc. acted as bookrunners for the offering. William Blair & Company, L.L.C. and Canaccord Genuity Inc. acted as co-managers.

Altair is focused on the development and broad application of simulation technology to synthesize and optimize designs, processes and decisions for improved business performance.