X0206 3 2017-10-31 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 140000 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 Stock Option (right to buy) 2.48 2023-08-06 Class A Common Stock 418920 D Stock Option (right to buy) 3.79 2024-12-15 Class A Common Stock 3460 D Stock Option (right to buy) 3.84 2025-12-17 Class A Common Stock 3024 D Stock Option (right to buy) 3.64 2026-05-17 Class A Common Stock 3872 D Stock Option (right to buy) 5.18 2027-06-09 Class A Common Stock 27224 D The reporting person serves as trustee. 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. The options vested in 4 equal annual installments commencing August 6, 2014. This option is currently fully vested. The options vest in 4 equal annual installments commencing December 15, 2015. The options vest in 4 equal annual installments commencing December 17, 2016. The options vest in 4 equal annual installments commencing May 17, 2017. The options vest in 4 equal annual installments commencing June 9, 2018. Exhibit List Exhibit 24 - Power of Attorney /s/ Howard N. Morof 2017-10-31