X0708 D LIVE 0001701732 Altair Engineering Inc. 1820 East Big Beaver Road Troy MI MICHIGAN 48083 248-614-2400 DELAWARE None Altair Engineering Ing. Corporation true James R. Scapa 1820 East Big Beaver Road Troy MI MICHIGAN 48083 Executive Officer Chief Executive Officer Jim Anderson 1820 East Big Beaver Road Troy MI MICHIGAN 48083 Director Shekar Ayyar 1820 East Big Beaver Road Troy MI MICHIGAN 48083 Director Mary Boyce 1820 East Big Beaver Road Troy MI MICHIGAN 48083 Director Sandy Carter 1820 East Big Beaver Road Troy MI MICHIGAN 48083 Director Steve Earhart 1820 East Big Beaver Road Troy MI MICHIGAN 48083 Director Trace Harris 1820 East Big Beaver Road Troy MI MICHIGAN 48083 Director Computers Over $100,000,000 06b false 2024-07-11 true true true Certain shareholders of the corporation acquired in the business acquisition received shares of Class A common stock of the Issuer as a portion of their acquisition consideration. 0 5178427 3428913 1749514 Reflects the total value of Class A common stock (based on a specified price of $96.18 per share) that (a) may be issued for the acquisition; (b) was issued at closing; and (c) may be issued during a holdback period that will extend no less than 2 years true 1 9 0 0 0 false Altair Engineering Inc. /s/ Raoul Maitra Raoul Maitra Chief Legal Officer 2024-07-16