By default, while creating leads, the Company name field is mandatory. However, you can make this field non-mandatory if you do not have company name information for the lead. Here is how you can do it:

1. Click Setup > Customization > Modules.
   
2. Click the Leads module and select Layouts.
   
3. In the Edit Page Layout page, move the mouse pointer over the Company field.
   
4. In the popup window, undo the checkbox which says Mark as Required.
   
5. Click Save Layout.