Extract only maximum date from column

I want the script to extract only the maximum `next_contact' date and
haven't learned how to do this from my reading of web sites.

The script:

select p.person_nbr, p.company_nbr, c.next_contact
from people as p, contacts as c
where c.next_contact >= '2025-11-01'
group by p.person_nbr, p.company_nbr, c.next_contact
order by p.person_nbr, p.company_nbr, max(c.next_contact);

returns all contacts rather than only the latest one.

Is using a sub-select the proper way?

TIA,

Rich