Some of the best-selling bread companies in the United States are Nature's Own, Sara Lee, Brownberry and Pepperidge Farm. Statista provides a table of the top 10 bread sellers in the United States based on annual data.
An alphabetical list of worldwide baking companies can be found on Ranker's post titled "List of Bakery Companies," but only 50 baking companies are included. Wikipedia also has a list of some bakeries from a select group of countries and lists the names of the companies alphabetically, by country. No data is provided regarding the size of the companies or their sales figures.