Past research has demonstrated that security prices and returns are associated with earnings changes.' One study has even stated, Of all the information about an individual firm which becomes available during a year, one-half or more is captured in that year's income number.2 Firms with complex capital structures report earnings differently from firms with simple capital structures. Does their earnings per share reporting provide more information to the capital market? Accounting Principles Board Opinion No. 15, Earnings Per Share, provides guidelines for the calculation and reporting of earnings per common share (EPS) when potentially dilutive securities (PDS) are outstanding. PDS include convertible bonds, convertible preferred, stock options, warrants and rights that could in the aggregate, if exercised, result in a dilution of earnings per share. Firms with PDS are said to have complex capital structures. APB No. 15 requires that these firms report primary earnings per share (P) and fully diluted earnings per share (D), rather than the normally recorded actual earnings per share (i.e., earnings available to common stockholders divided by actual average outstanding common shares), hereafter referred to as simple EPS. When a company's capital structure contains PDS, P is based on all securities, treating those deemed to be common stock equivalents and dilutive as if the purchase or conversion option had been exercised. The effective at the time of issuance of the convertible security determines whether it is classified as a common stock equivalent. If the interest yield to maturity is equal to or greater than two-thirds of the average yield to maturity on Aa-related corporate bonds at the time of issuance, the security is considered to have been sold on the basis of its bond characteristics and is accounted for as debt. If the yield is less than two-thirds of that rate, it is considered to have been sold for its equity characteristics and is accounted for as a common stock equivalent. For warrants, rights and other options whose exercise would involve a receipt of cash, a stock is used to compute the number of shares of common stock used in the computation of P and D. This method assumes that the proceeds that would be received if PDS options were exercised would be used to purchase up to 20 per cent of the outstanding common shares in order to partially satisfy the exercise. If the presumed receipts exceed the market value of 20 per cent of the outstanding common shares, the excess is assumed to be used first to reduce short and long-term debt and then for investments in U. S. government securities, thereby reducing interest expense and increasing interest income. This hypothetical earnings number becomes the basis for reported earnings. Several studies have criticized APB No. 15 because of its arbitrariness, because it introduces an exogenous factor (i.e., interest rates) into the EPS computation, because of the impossibility of predicting conversion, and because the Treasury stock method may be used even if the exercise price exceeds the market price of the stock.3 This note examines a sample of firms that reported both primary and fully diluted earnings per share. We compute a simple EPS-the figure that would be reported if APB No. 15 were not applied-and two cash EPS values. We compare the degree of association of each of these earnings definitions with stock returns. We find that simple EPS and one of the flow definitions exhibit significantly higher correlations than primary and fully diluted EPS. Neither the simple nor the flow EPS is reported in the annual reports of firms required to report according to APB No. 15.
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