George J Christ

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
23 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	No	109.1316	999	109.02 k	0
23 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	No	108.2923	3,601	389.96 k	999
23 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	No	107.0794	69,096	7.40 mm	4,600
23 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	No	106.5022	14,545	1.55 mm	73,696
23 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	No	104.4948	1,724	180.15 k	88,241
23 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	No	103.0218	7,040	725.27 k	89,965
23 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	No	101.9199	2,995	305.25 k	97,005
14 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	No	95.3144	2,176	207.40 k	300,000
11 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	No	96.1469	3,715	357.19 k	302,176
11 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	No	95.196	94,109	8.96 mm	305,891

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