Sean P Leuba

Date	Company	Security	Transaction	Code	Indirect	10b5-1	$Price	#Shares	$Value	#Remaining
6 Mar 25	MEC Mayville Engineering	Common Stock	Buy	Acquire P	Yes	No	14.179	1,000	14.18 k	2,000
28 Feb 25	MEC Mayville Engineering	Common Stock	Payment of exercise	Dispose F	No	No	14.95	2,731	40.83 k	14,492
28 Feb 25	MEC Mayville Engineering	Common Stock	Option exercise	Acquire M	No	No	0	6,165	0.00	17,223
28 Feb 25	MEC Mayville Engineering	RSU Common Stock	Option exercise	Dispose M	No	No	0	6,165	0.00	0
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

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