It's better to sort this out before you have to open your books to the eyes of the world. European stock markets are not as liquid as in the U.S. and European investors are more conservative. The buyer will be looking for depth of management, a history of audited financial statements, consistent reinvestment of earnings into operations, and regular business plans and projections. The negotiation of a company sale is complex and needs the assistance of qualified accountants, bankers and lawyers to make sure that you are getting the best deal possible. There are a number of ways to identify possible purchasers.
Newspapers carry ads from people seeking to buy companies.
Business brokers make a career out of matching company purchasers and sellers. Trade associations and trade conferences are usual sources of information about possible purchasers. You will need help in preparing the sales document, managing the process of short-listing potential acquirers, and handling the negotiating process. Your accountants, bankers, and lawyers have already worked with your company and know how it operates. They will probably be the best advisers in your sales negotiations.