For many founders, acquisition is evidence that the venture worked. For immigration purposes, however, commercial success and settlement eligibility are not the same inquiry. Appendix Innovator Founder rewards specified business achievements, but it also requires a live relationship between the applicant, the endorsed business and the role being performed when settlement is sought.
That distinction becomes acute when a buyer wants the shares, the operating assets, the intellectual property or the founder's services before the 3 year qualifying period is complete. The sale agreement may deliver an excellent economic outcome while leaving the endorsed company dormant, the founder outside management or the original business plan overtaken by the buyer's integration strategy.
There is no dependable answer based only on the percentage sold. The transaction must be tested against what remains after completion and what an endorsing body can truthfully confirm for the settlement application.