X0206 3 2017-10-31 0 0001701732 Altair Engineering Inc. ALTR 0001720804 Brennan Jeffrey M C/O ALTAIR ENGINEERING INC. 1820 E. BIG BEAVER ROAD TROY MI 48083 0 1 0 0 Chief Marketing Officer Class A Common Stock 58780 D Stock Option (right to buy) 0.00 2036-12-01 Class A Common Stock 184388 D Stock Option (right to buy) 0.46 2017-12-21 Class A Common Stock 5064 D Stock Option (right to buy) 2.48 2022-12-21 Class A Common Stock 2000 D Stock Option (right to buy) 3.79 2024-12-15 Class A Common Stock 3404 D Stock Option (right to buy) 3.84 2025-12-17 Class A Common Stock 3136 D Stock Option (right to buy) 3.64 2026-05-17 Class A Common Stock 3736 D Stock Option (right to buy) 5.18 2027-06-09 Class A Common Stock 3052 D The options vested upon grant. The option is currently fully vested. The options vested in 4 equal annual installments commencing December 31, 2008. This option is currently fully vested. The options vested in 4 equal annual installments commencing December 21, 2013. This option is currently fully vested The options vest in 4 equal annual installments commencing December 15, 2015. The option exercise price is $0.000025. 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/ Jeffrey M. Brennan 2017-10-31