As Of	Filer	Filing¹	For·On·As	Docs:Size	Issuer		Filing Agent

10/17/23  Scapa James Ralph                 4          D,O,%Owner² 1:20K  Altair Engineering Inc.           Computershare Inc.       
10/17/23  JRS Investments LLC               4          10% Owner²  1:10K  Altair Engineering Inc.           Computershare Inc.       
10/17/23  James R. Scapa Declaration of Tr  4          10% Owner²  1:11K  Altair Engineering Inc.           Computershare Inc.       
10/16/23  Scapa James Ralph                 144                    1:8K   Altair Engineering Inc.           J.P. Morgan Secs LLC/FA  

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¹	Filing/Form Types:
	4	Statement of Changes in Beneficial Ownership of Securities by an Insider — Form 4 { The Filer is an Insider² of the Issuer }.
	144	Notice of a Proposed Sale of Securities by an Insider — Form 144 { The Filer is an Insider² of the Issuer }.
²	Insider:  The Filer is a Director, Officer, 10% Owner and/or Other “insider” of the Issuer.