this is my first time looking for help at a forum so i feel excited,

I need to make a formula to find if an user has an stock update on the first month and never updated their stock again,

I have the data for their stock update and also the month they're doing it as a month sequence but i cant solve how to do it i think its maybe an IF statement to check distinct emails but i don't know how to do it.

I need something like this:

table desired

UPDATE: Testing table of how my source data looks: https://docs.google.com/spreadsheets/d/1ipNi_ioxtlYWvayEn6BQeQjkYR_pilZJoWPdzVenNHg/edit#gid=0