Firms issuing convertible debt experience poor long-run stock price and operating performance. We examine the possibility that this poor performance may be caused by an unexpected increase in the cost of capital. Our finding that the cost of capital decreases following a convertible debt offer (CDO) is inconsistent with this interpretation. We also provide evidence that idiosyncratic and total risk increases and that these increases are not related to corresponding changes in the issuer's industry. The results are consistent with an interpretation that idiosyncratic risk affects investment decisions following convertible debt offers, which in turn adversely impacts future operating performance. Our empirical evidence reinforces the notion suggested in earlier studies that the efficient investment decisions predicted by theory are not achieved by the actual design and issuance of convertible debt securities in practice.

Many firms issue hybrid securities, such as convertible debt, instead of standard securities like straight debt or common equity. Theoretical arguments suggest that convertible debt minimizes costs for firms facing high debt- and equity-related external financing costs. Theory also suggests that an appropriately designed convertible security provides efficient investment incentives. We show, however, that firms on average perform poorly following the issuance of convertible debt. The empirical evidence suggests that the efficient investment decisions predicted by theory are not in fact achieved by the actual design and issuance of convertible debt securities. An alternative interpretation of convertible debt offers is that investors ration the participation of some issuers in the seasoned equity market.

We review the literature on the issuance motives, shareholder wealth effects, and design of convertible bonds. Empirical studies on convertible debt issuance mainly focus on testing the predictions of four traditional theoretical models based on convertibles' potential to mitigate agency or adverse selection costs, and obtain mixed evidence. Recent studies on shareholder wealth effects of convertible bond issues highlight the need to control for arbitrage-related short selling and post-issuance risk changes. Studies on the determinants of convertible bond design uncover earnings management, as well as catering incentives to convertible arbitrage funds, as important determinants of innovations in convertible bond characteristics. Overall, our review indicates that recent empirical research on convertible debt provides valuable insights into issue motives and determinants of financial innovations, but also considers the broader question of how investor demand characteristics impact corporate finance decisions. We conclude with an overview of potential research questions to be addressed by future research on hybrid securities.