X0306 4/A 2019-11-05 2019-11-07 0001701732 Altair Engineering Inc. ALTR 0001720312 Schramm Uwe C/O ALTAIR ENGINEERING INC. 1820 E. BIG BEAVER RD. TROY MI 48083 1 Chief Vision Officer Class A Common Stock 2019-11-05 4 M 0 4000 3.84 A 54938 D Stock Option (Right to Buy) 3.84 2019-11-05 4 M 0 4000 0 D 2025-12-17 Class A Common Stock 4000 3252 D This Form 4 corrects the prior Form 4 filed on November 7, 2019. The exercise of 4,000 Class A Common Stock options was inadvertently omitted on the prior Form 4 of the Reporting Person. Includes 4,619 Class A Common Stock restricted stock units that are unvested. The options vest in 4 equal annual installments commencing December 17, 2016. /s/ Raoul Maitra, attorney-in-fact for Uwe Schramm 2022-04-22