In a business valuation context, the term “marketability” refers to the ability to quickly convert property to cash at minimal cost. While publicly traded stocks are readily marketable, interests in private companies typically require substantial time, cost and effort to sell. To the extent that public stock data is used to value private businesses, a discount may be warranted to reflect the lack of marketability. However, an important distinction must be made when applying these discounts to controlling interests. Minority vs. controlling interests Marketability discounts are well established when valuing minority interests in closely held businesses. Several empirical studies support and quantify these discounts. Restricted stock and pre-IPO studies, for example, demonstrate the spread between prices paid for freely traded shares and identical shares that are less...