Multiple meters and service panels from one service drop.

So I came across a situation that I’m not sure about.
If you have one service drop running to 3 meters, and 3 main service panels, do each of the panels need their own seperate ground or can they be tied together with only 1 ground?
This is in Chicago IL.
Thanks for any help.

Don’t see why not. Grounding is grounding.
Cheers