X0508 4 2024-05-10 0001701732 Altair Engineering Inc. ALTR 0001949593 Kunju Ravi C/O ALTAIR ENGINEERING INC. 1820 E. BIG BEAVER RD. TROY MI 48083 1 Chief Product Strategy Officer 0 Common Stock 2024-05-10 4 S 0 1095 85.3208 D 30582 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $85.2513 to $85.35 per share, inclusive. The reporting person undertakes to provide to Altair Engineering Inc., any security holder of Altair Engineering Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein. Includes 8,376 Class A Common Stock restricted stock units that are unvested. /s/ Raoul Maitra, attorney-in-fact for Ravi Kunju 2024-05-14