The purpose of this paper is to provide evidence concerning investor reactions to off-balance sheet disclosures of concancellable leases as reflected in security prices. A valuation model is defined based upon the work of Modigliani and Miller which expresses the market value of the firm's common stock as a function of lease indebtedness. Data for the empirical analysis are obtained from Compustat and SEC form 10 K's. Crosssectional regressions are run by risk class on samples of 620 firms reporting rent expense, 432 firms disclosing lease commitments, and 139 firms reporting present values of so-called “financing” leases.