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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1701732	Altair Engineering Inc.	ALTR	Services-Prepackaged Software (7372)	382591828

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1839690	Stephanie Buckner	C/O Altair Engineering Inc. 1820 E. Big Beaver Rd. Troy MI 48083	Chief Operating Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Class A Common Stock	Disposition	2023-03-01	174	$63.84	9,774	No	4	S	Direct
Class A Common Stock	Acquisiton	2023-03-02	5,000	$0.00	14,774	No	4	A	Direct
Class A Common Stock	Acquisiton	2023-03-02	593	$0.00	6,628	No	4	A	Indirect	By husband

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	A	Direct
No	4	A	Indirect	By husband

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Class A Common Stock	Stock Option (Right to Buy)	Acquisiton	2023-03-02	12,500	$0.00	12,500	$65.19
Class A Common Stock	Stock Option (Right to Buy)	Acquisiton	2023-03-02	1,780	$0.00	1,780	$65.19

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
12,500		2033-03-02	No	4	A	Direct
1,780		2033-03-02	No	4	A	Indirect

Footnotes

Includes 3,975 Class A Common Stock restricted stock units that are unvested.
On March 2, 2023, the Reporting Person was granted 5,000 Class A Common Stock restricted stock units, which vest in 4 equal annual installments commencing March 2, 2024.
Includes 8,975 Class A Common Stock restricted stock units that are unvested.
On March 2, 2023, the Reporting Person's husband was granted 593 Class A Common Stock restricted stock units, which vest in 4 equal annual installments commencing March 2, 2024.
Includes 3,646 Class A Common Stock restricted stock units that are unvested.
On March 2, 2023, the Reporting Person was granted 12,500 Class A Common Stock options, the options vest in 4 equal annual installments commencing March 2, 2024.
On March 2, 2023, the Reporting Person's husband was granted 1,780 Class A Common Stock options, the options vest in 4 equal annual installments commencing March 2, 2024.