Matthew Charles Brown

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
2 Mar 23	ALTR Altair Engineering	Class A Common Stock	Grant	Acquire A	No	No	0	8,250	0.00	42,871
2 Mar 23	ALTR Altair Engineering	Stock Option Class A Common Stock	Grant	Acquire A	No	No	65.19	20,625	1.34 mm	20,625
1 Mar 23	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	No	No	63.84	956	61.03 k	34,621
1 Mar 23	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	No	No	63.84	348	22.22 k	35,577
1 Mar 23	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	No	No	63.84	2,173	138.72 k	35,925
14 Jan 23	ALTR Altair Engineering	Class A Common Stock	Grant	Acquire A	No	No	42.31	142	6.01 k	38,098
15 Dec 22	ALTR Altair Engineering	Stock Option Class A Common Stock	Grant	Acquire A	No	No	45.91	24,000	1.10 mm	24,000
14 Jul 22	ALTR Altair Engineering	Class A Common Stock	Grant	Acquire A	No	No	41.68	145	6.04 k	37,956
19 Mar 22	ALTR Altair Engineering	Class A Common Stock	Grant	Acquire A	No	No	0	11,000	0.00	37,811
19 Mar 22	ALTR Altair Engineering	Stock Option Class A Common Stock	Grant	Acquire A	No	No	64.15	8,000	513.20 k	8,000

Data from 3, 4 and 5 filings. Values as filed, not updated for current price.