I sold my business in a stock sale, but I didn't receive a 1099-B. How do I report this?

It seems like I can report this as an "Other" investment, but some of the fields don't make sense. - Who is the "broker". Should I put the the settlement agent? - Under "How did you receive this investment?" there is no option to indicate that I started the company. I can select "I purchased it", but that's not accurate.