Class F Stock is a founder-friendly form of common stock that generally has super-voting rights. Many public corporations have dual class stock structures in which one form of stock has 10 to 1 voting superiority over the common stock, as well as other protective provisions. Typically, these companies call their super-voting stock Class B Common Stock, not Class F. Class F Common Stock, as nomenclature, has not really become common, despite the prevalence of dual class stock structures for startups.