How to find the position of a company given other companies in a Pandas DataFrame with Python

So I have a Pandas DataFrame. I am doing some data analysis with Python with some sets of companies based on the products they offer on my website.

For example, I have a column called ProductID and another called Company

So to find the most trending products on my website, I can do so by:

df.ProductID.value_counts(normalize=True).nlargest(10).plot(kind="bar")

And each product is offered by a company, and a company could have several products, that is a company can have several ProductID. ie Company A has ProductID 10,12,13,14

How do I find the market position of a company? Keeping in mind that out of the top 10, a company's product could appear up to 3 times or even more depending on the company's popularity