United States securities and exchange commission logo

                     July 1, 2022

       Matthew Brown,
       Chief Financial Officer
       Altair Engineering Inc.
       1820 East Big Beaver Road
       Troy, MI 48083

                                                        Re: Altair Engineering
                                                            Form 10-K for the
Fiscal Year Ended December 31, 2021
                                                            Filed February 28,
                                                            File No. 001-38263

       Dear Mr. Brown,:

              We have completed our review of your filing. We remind you that
the company and its
       management are responsible for the accuracy and adequacy of their
disclosures, notwithstanding
       any review, comments, action or absence of action by the staff.


                     Division of Corporation Finance

                     Office of Technology