What we do and do not know about convertible bond financing

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.     

LEVERAGE,RISK-SHIFTING INCENTIVE,AND STOCK-BASED COMPENSATION

Outstanding risky debt provides risk-shifting incentives for managers fully aligned with stockholders. Earlier research shows that the risk-shifting incentive can be eliminated by using a stock-based compensation design to align managers' and stockholders' interests. I show that stock options as well as compensation designs that align managers' and bondholders' interests eliminate the risk-shifting incentive. Although a stock-based compensation design is not a unique mechanism to eliminate the pure risk-shifting incentive, it is essential where managers of levered firms are known to consume a portion of the investment outlay as perquisites.     

Entrepreneur’s incentives for risk-taking and short-term debt

We investigate the effects of short-term debt for entrepreneur’s incentives for risk-taking. To do so, we develop a model by introducing short-term debt and financing frictions into the entrepreneur framework. The more risk-averse entrepreneur overestimates the liquidity risk and undervalues the private equity, leading to higher incentives for risk-taking. Short-term debt mitigates the risk-shifting problem induced by the entrepreneur’s preference while generating additional risk-taking incentives via rollover risk. We consequently challenge the view of Seta et al. (2020) by predicting a trade-off between the two effects of short-term debt for entrepreneurs, offering a new perspective to harmonize the existing arguments.     

UNDERSTANDING THE DESIGN OF CONVERTIBLE DEBT

There are now two dominant theories of convertible debt held by academic economists. One theory which has been called the "risk-shifting" hypothesis–effectively views convertibles as an alternative to straight debt. The second–known as the "sig-nalling" (or "backdoor-equity") theory-treats convertibles as an alternative to ordinary equity. This article attempts to unify (or at least to illustrate the relationship between) these two theories by focusing on the design of the securities.
In structuring a convertible, managers and their investment bankers must make a variety of decisions. Besides the coupon rate, face value, issue size, and maturity, managers must also decide the conversion ratio (the number of shares promised per bond) and the amount of call protection afforded investors. Several of these design features have the effect of making a convertible more like a straight debt or a straight equity issue. The hypothesis underlying the authors' recent research is that the issuers of debt-like convertibles are attempting to address a somewhat different financing challenge than the issuers of convertibles that behave more like equity. Their findings suggest that the primary aim of "debt-like" convertible issues is to address investors' uncertainty and concerns about risk, whereas the main goal of "equity-like" convertibles is to minimize the "information costs" associated with raising new equity.     

The long-run performance of firms that issue convertible debt: an empirical analysis of operating characteristics and analyst forecasts

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.     

Why is Convertible Debt Subordinated? An Investment‐Based Agency Theory

This paper offers an agency‐based explanation for the junior priority status of convertible bonds. Using a simple economic model, I show that when convertible and straight debt have equal priority, shareholders can prefer value‐decreasing projects, which results in wealth transfers from bondholders to shareholders; and I prove that this problem is solved when convertible debt is subordinated. Empirical evidence supports the theory. I find that firms with greater potential for investment‐based agency conflicts are more likely to issue subordinated convertible debt, and firms with senior convertible debt are more likely to deviate from the optimal investment policy.     

CONVERTIBLE DEBT AND RISK‐SHIFTING INCENTIVES

I argue that convertible debt, in contrast to its perceived role, can produce shareholders’ risk‐shifting incentives. When a firm's capital structure includes convertible debt, every investment decision affects not only the distribution of the asset value but also the likelihood that the debt will be converted and thereby the distribution of the firm's leverage. This suggests that managers can engage in risk‐increasing projects if a higher asset risk generates a more favorable distribution of leverage. Empirical evidence using 30 years of data supports my argument.     

The impact of rights issues of convertible debt in Australian markets

Australian convertible debt issues are rights issues of non-callable securities and are issued in a market characterised by thin trading, significant institutional investor participation rates and a high number of resource firms. However, this study documents a significant negative announcement effect for rights issues of convertible debt, similar to international evidence. An analysis of the determinants of the announcement effect supports variants of the information asymmetry and agency cost hypotheses. The results do not support the convertible debt models of Kim [Kim, Y., 1990. Informative conversion ratios, a signalling approach. Journal of Financial and Quantitative Analysis 25, 229–243], Brennan and Kraus [Brennan, M., Kraus, A., 1987. Efficient financing under asymmetric information. Journal of Finance 42, 1225–1243], Green [Green, R.C., 1984. Investment incentives, debt and warrants. Journal of Financial Economics 13, 115–136] but some support is found for Stein's [Stein, J., 1992. Convertible bonds as backdoor equity financing. Journal of Financial Economics 32, 3–22], convertible debt model and Mayers [Mayers, D., 1998. Why firms issue convertible bonds: the matching of financial and real investment options. Journal of Financial Economics 47, 83–102], sequential financing model. However, support is found for Brous and Kini [Brous, P.A., Kini, O., 1994. The valuation effects of equity issues and the level of institutional ownership: evidence from analysts’ earnings forecasts. Financial Management 23, 33–46], equity issue based external monitoring model and Eckbo and Masulis [Eckbo, B., Masulis, R., 1992. Adverse selection and the rights offer paradox. Journal of Financial Economics 32, 292–332], rights issue adverse selection model.     

Do Investor Demand and Market Timing Affect Convertible Debt Issuance Decisions by REITs?

The unique regulatory environment of REITs casts doubt on the traditional theoretical process by which REIT managers base their convertible debt issuance decisions on issuer condition and prospects. Anecdotal evidence shows that REITs may have catered to demand by investors, including a demand by convertible bond arbitrageurs when issuing convertible debt. This study examines the rationale behind convertible debt issuances by REITs, focusing on the possible impacts of investor demand and market timing. The results suggest that investor demand significantly affects convertible debt issuance decisions by REITs while certain unknown factors appear to have contributed to the sudden increase of convertible debt offerings in 2006 and 2007. REITs also time the market to conditions in the public debt market. The results only partially support the offered risk-shifting, risk-uncertainty, backdoor-equity, and sequential-financing hypotheses.     

A SEQUENTIAL SIGNALING MODEL OF CONVERTIBLE DEBT ISSUE AND CALL POLICIES

This paper offers a new explanation for why some risk‐averse firms may prefer to issue callable convertible debt. Here, the convertible debt issue and call policies are integrated into a unified financing policy. It is then shown that for firms with relatively low unsystematic risk, convertible debt issuance followed by an appropriate in‐the‐money signaling call policy reduces more unsystematic equity risk than equity, callable straight debt, or their combination. The model is modified to incorporate asymmetric information at the issue stage to explain the stock price behavior at announcements of convertible debt sales.     

Top-Management Compensation and Capital Structure

The interrelationship between top-management compensation and the design and mix of external claims issued by a firm is studied. The optimal managerial compensation structures depend on not only the agency relationship between shareholders and management, but also the conflicts of interests which arise in the other contracting relationships for which the firm serves as a nexus. We analyze in detail the optimal management compensation for the cases when the external claims are (1) equity and risky debt, and (2) equity and convertible debt. In addition to the role of aligning managerial incentives with shareholder interests, managerial compensation in a levered firm also serves as a precommitment device to minimize the agency costs of debt. The optimal management compensation derived has low pay-performance sensitivity. With convertible debt, instead of straight debt, the corresponding optimal managerial compensation has high pay-to-performance sensitivity. A negative relationship between pay-performance sensitivity and leverage is derived. Our results provide a reconciliation of the puzzling evidence of Jensen and Murphy ( 1990 ) with agency theory. Other testable implications include (1) a relationship between the risk premium in corporate bond yields and top-management compensation structures, and (2) the announcement effect of adoption of executive stock option plans on bond prices. The model yields implications for management compensation in banks and Federal Deposit Insurance reform. Our results explain the dynamics of top-management compensation in firms going through financial distress and reorganization.     

Outside monitoring and CEO compensation in the banking industry

We hypothesize that CEO compensation is optimally designed to trade off two types of agency problems: the standard shareholder-management agency problem as well as the risk-shifting problem between shareholders and debtholders. Analyses in this setup produces two predictions: (1) the pay-for-performance sensitivity of CEO compensation decreases with the leverage ratio; and (2) the pay-for-performance sensitivity of CEO compensation increases with the intensity of outside monitoring on the firm's risk choice. We test these two hypotheses for the banking industry where regulators and nondepository (subordinated) debtholders provide outside monitoring on the risk choice. We construct an index of the intensity of outside monitoring based on three variables: subordinated debt rating, non performing loan ratio and examination rating assigned by regulators. We find supporting evidence for both hypotheses.     

Secured debt and managerial incentives

Financial theory holds that firms can control agency costs through the use of short-term and secured debt. We examine the relation between the use of secured debt and the incentive of the manager to increase the risk of the firm, as measured by vega. We find that firms utilize secured debt to a lesser extent when managerial volatility sensitivity is higher. Our results suggest that these same firms employ short-term debt as the primary tool to control risk-shifting. Managers with a high risk appetite avoid secured debt, but appear to do so without compromising the interests of the shareholders.     

Temporal resolution of uncertainty,disclosure policy,and corporate debt yields

In this paper, we study how risk-shifting incentives and the design of debt covenants are affected by the pattern of temporal resolution of uncertainty (TRU) in the underlying technology of the firm. We show that the extent of risk-shifting as well as the yield demanded on corporate debt are larger the later the resolution of uncertainty (thus providing one explanation for the empirical evidence of Reisz and Perlich (2006)). We allow for contracting based on verifiable information disclosed by the manager. In this context, we characterize optimal covenants restricting investment. The effects of these covenants on the firm's investment policy and corporate bond yields under different disclosure policies and patterns of TRU are studied. Empirical implications are derived and discussed.     

Executive Compensation and the Maturity Structure of Corporate Debt

Executive compensation influences managerial risk preferences through executives' portfolio sensitivities to changes in stock prices (delta) and stock return volatility (vega). Large deltas discourage managerial risk‐taking, while large vegas encourage risk‐taking. Theory suggests that short‐maturity debt mitigates agency costs of debt by constraining managerial risk preferences. We posit and find evidence of a negative (positive) relation between CEO portfolio deltas (vegas) and short‐maturity debt. We also find that short‐maturity debt mitigates the influence of vega‐ and delta‐related incentives on bond yields. Overall, our empirical evidence shows that short‐term debt mitigates agency costs of debt arising from compensation risk.     

Investor protection and convertible debt design

An important issue that firms consider when designing convertible debt is to specify security features such as conversion ratio, maturity date and call period. Following Lewis et al. [Lewis, M., Rogalski, R., Seward, J., 2003. Industry conditions, growth opportunities and market reactions to convertible debt financing decisions. Journal of Banking and Finance 27, 153–181], we employ a single measure that simultaneously considers all of these features: the expected probability (measured at issue date) that the convertible will be converted to equity at maturity. We find that firms in countries with stronger shareholder rights issue convertible debt with a higher expected probability of converting to equity. The positive association between the expected probability of conversion and shareholder rights is less pronounced in firms for which ownership structures create potentially high managerial agency costs. Specifically, in countries with stronger shareholder rights, firms with higher separation of control rights and cash flow rights tend to issue convertibles with lower probability of conversion. Furthermore, we find that large non-management block ownership strengthens the likelihood of issuing convertible debt with higher probability of conversion in countries with stronger shareholder rights. In contrast, firms in countries with stronger creditor rights issue convertibles with lower probability of conversion. We also document that the negative association between creditor rights and probability of conversion is more pronounced in firms with higher separation of control rights and cash flow rights.     

Switching to a poor business activity: optimal capital structure, agency costs and covenant rules

We address the issue of modeling and quantifying the asset substitution problem in a setting where equityholders decisions alter both the volatility and the return of the firm cash flows. Our results contrast with those obtained in models where the agency problem is reduced to a pure risk-shifting problem. We find larger agency costs and lower optimal leverages. We identify the bankruptcy trigger written in debt indenture, which maximizes ex-ante firm value, given that equityholders will ex-post be able to risk-shift. Our model highlights the tradeoff between ex-post inefficient behavior of equityholders and inefficient covenant restrictions.      

CEO inside debt and convertible bonds

The question whether convertible bonds are issued to combat the risk‐shifting problem is a subject of debate in the literature, primarily because of the unavailability of clear measures regarding managerial risk‐shifting incentives. Taking advantage of recently developed inside debt‐holding measures for CEOs, we find strong evidence in support of the risk‐shifting hypothesis. When a CEO holds a large amount of inside debt, three distinct patterns emerge: (i) the firm exhibits a lower ratio of outstanding convertibles to total debt; (ii) the firm is less likely to issue convertibles than straight debt; and (iii) the firm devises contract terms to decrease the chance of conversion when it issues convertibles.     

CONVERTIBLE DEBT AND INVESTMENT INCENTIVES

In this paper we examine the effect of convertible debt on the investment incentives facing stockholders. The effect depends critically on the value of existing assets relative to the firm's investment requirements. With a restrictive dividend covenant, convertible debt mitigates the overinvestment incentive associated with risky debt but exacerbates the underinvestment incentive at higher values of existing assets. A less-restrictive dividend covenant exacerbates overinvestment under straight debt financing but reduces the underinvestment incentive induced by the conversion feature. In this context, a convertible debt contract with a less-restrictive dividend covenant maximizes firm value.