This is straightforward extension that displays company name inside admin orders grid. It uses Customer billing address for displaying company name. It allows you to use this field also in search and sorting.
By default Magento displays in Orders grid just First and Last name, but not company name. With this module you can see also company name in the grid. This is very useful especially for B2B shops where company name is more important than full name. If you need to display company name also inside Order grid, check also this extension.