James Ralph Scapa

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
3 Dec 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	No	No	105.65	16,095	1.70 mm	117,950
29 Nov 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	Yes	105.6904	6,500	686.99 k	0
29 Nov 24	ALTR Altair Engineering	Class A Common Stock	Conversion	Acquire C	Yes	No	0	6,500	0.00	6,500
29 Nov 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	Yes	105.6904	6,500	686.99 k	0
29 Nov 24	ALTR Altair Engineering	Class A Common Stock	Conversion	Acquire C	Yes	No	0	6,500	0.00	6,500
29 Nov 24	ALTR Altair Engineering	Class B Common Stock Class A Common Stock	Conversion	Dispose C	Yes	No	0	6,500	0.00	6,626,682
29 Nov 24	ALTR Altair Engineering	Class B Common Stock Class A Common Stock	Conversion	Dispose C	Yes	No	0	6,500	0.00	10,241,110
28 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	Yes	103.8409	296	30.74 k	0
28 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	Yes	103.1924	2,522	260.25 k	296
28 Oct 24	ALTR Altair Engineering	Class A Common Stock	Sell	Dispose S	Yes	Yes	102.0806	3,682	375.86 k	2,818

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