Sales rep activity by number of companies contacted

Picture this:

1. Sales rep A is contacting 50 companies in a month, and making 4 activities for each

2. Sales rep B is contacting only 4 companies, but making 50 activities for each

Both have 200 activities per month, but the Sales rep B is not selling as well as the Sales rep A. You can hopefully see why is it so. But how can I see that difference in HubSpot?
Based on the customer support this report is not available, but I think it shows clearly the potential that sales rep have in opening their new market areas.

So the idea is to get a report on how many companies reps have contacted - broken down by activity.

Useful to differentiate how many companies were reached by a sales rep rather than how many times reps have reached out to any companies!