De or het regiomarketing?

The correct Dutch article is:

de regiomarketing

Rule Words ending in -ing: almost always de. See the rule

How to use regiomarketing

the regiomarketingde regiomarketing
this regiomarketingdeze regiomarketing
that regiomarketingdie regiomarketing
our regiomarketingonze regiomarketing
your regiomarketingjouw regiomarketing
every regiomarketingelke regiomarketing
which regiomarketing?welke regiomarketing?
a big regiomarketing / the big regiomarketingeen grote regiomarketing, de grote regiomarketing