Type	Name	Date
Indenture	Indenture, between Altair Engineering Inc. and U.S. Bank Trust Company, National Association, as trustee	06/15/2022
Indenture	Indenture, by and between Altair Engineering Inc. and U.S. Bank National Association	06/10/2019
Indenture	First Supplemental Indenture, by and between Altair Engineering Inc. and U.S. Bank National Association	06/10/2019
Credit agreement	SECOND AMENDMENT TO THIRD AMENDED AND RESTATED CREDIT AGREEMENT	06/06/2019

Type	Name	Date
Merger agreement	Agreement and Plan of Merger, by and among Altair Engineering Inc., Datawatch Corporation and Dallas Merger Sub, Inc	11/05/2018