X0306 4 2020-06-12 0 0001701732 Altair Engineering Inc. ALTR 0001720315 Morof Howard N C/O ALTAIR ENGINEERING INC. 1820 E. BIG BEAVER ROAD TROY MI 48083 0 1 0 0 Chief Financial Officer Class A Common Stock 2020-06-12 5 G 0 E 7774 0.00 D 5392 D Class A Common Stock 2020-06-12 5 G 0 E 7774 0.00 A 329555 I By Howard N. Morof Revocable Trust dated August 7, 1992 Class A Common Stock 141080 I By Howard N. Morof Irrevocable Grantor Trust dated September 11, 2017 Includes 5,392 Class A Common Stock restricted stock units that are unvested. The Reporting Person serves as trustee. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose. /s/ Raoul Maitra, attorney-in-fact for Howard N. Morof 2020-06-15