Do we have a list of ir er verbs with the consonant o in the stem which do not change?

Hola Dennis

I'm afraid not. We tend to make lists of verbs that undergo some sort of irregularity.

To name some of those verbs that have an -o in the stem and don't change to -ue, you have for example:

Cortar - to cut

Notar - to realise

Frotar - to scrub

Votar - to vote

Engordar - to get fat

Coser - to sew

Comer - to eat

Coger - to take

Poner - to put 

Saludos

Inma