Yes - I agree with the previous suggestions and would add - make sure that you know what their major products are and have an idea of who their major competitors are for those products.
You wouldn't be expected to know everything about the products and the markets, but should be able to carry on an intelligent conversation with the interviewer about these things. In particular, you should be prepared to ask intelligent questions which reflect more than just a casual knowledge about their business.
All the best to you.