0001701732 2022-08-04 2022-08-04 false 0001701732 8-K 2022-08-04 Altair Engineering Inc. DE 001-38263 38-2591828 1820 E. Big Beaver Road Troy MI 48083 (248) 614-2400 false false false false Class A Common Stock $0.0001 par value per share ALTR NASDAQ false