How to create a view showing the products from a user's company?
To achieve it with the current content architecture:


Create view of users.
Add a relationship Entity Reference: Referenced Entity. Mark it as required. This will make a connection between the user and the company.
Add another relationship Entity Reference: Referencing entity. Before saving add the value of the Relationship select list and select the relationship created in step #2. Mark this relationship as required too. This will make the connection between user company and the product.
You should now get the fields of products you could add to the view using the relationship you have built at step #3