Sean P Leuba

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
9 Jan 25	MEC Mayville Engineering	Common Stock	Payment of exercise	Dispose F	No	No	15	2,868	43.02 k	11,058
9 Jan 25	MEC Mayville Engineering	Common Stock	Option exercise	Acquire M	No	No	0	5,783	0.00	13,926
9 Jan 25	MEC Mayville Engineering	RSU Common Stock	Option exercise	Dispose M	No	No	0	5,783	0.00	0
7 Nov 24	MEC Mayville Engineering	Common Stock	Buy	Acquire P	Yes	No	16.125	1,000	16.13 k	1,000
15 Mar 24	MEC Mayville Engineering	RSU Common Shares	Grant	Acquire A	No	No	0	21,790	0.00	21,790
28 Feb 24	MEC Mayville Engineering	Common Stock	Payment of exercise	Dispose F	No	No	11.97	1,806	21.62 k	8,143
28 Feb 24	MEC Mayville Engineering	Common Stock	Option exercise	Acquire M	No	No	0	6,166	0.00	9,949
28 Feb 24	MEC Mayville Engineering	RSU Common Shares	Option exercise	Dispose M	No	No	0	6,166	0.00	6,165
9 Jan 24	MEC Mayville Engineering	Common Stock	Payment of exercise	Dispose F	No	No	13.5	2,000	27.00 k	3,783
9 Jan 24	MEC Mayville Engineering	Common Stock	Option exercise	Acquire M	No	No	0	5,783	0.00	5,783

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