We have had many successful cases of Founders that go through the program to receive valuable feedback from mentors even while they have already had an incorporated company. If the company is incorporated with an acceptable legal structure, then the company only needs to issue the warrant or option with the help of a professional law firm. Otherwise, the legal partner needs to work with the company to transition an incorrect structure to the proper structure as part of the engagement. 

The Founder Institute does not accept partnership and LLC formats, because these companies are not optimal for issuing shares and raising capital.