Essays on Bond Exchange-Traded Funds
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ESSAYS ON BOND EXCHANGE-TRADED FUNDS by Charles W. Evans A Dissertation Submitted to the Faculty of The College of Business in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Florida Atlantic University Boca Raton, Florida August 2011 ESSAYS ON BOND EXCHANGE-TRADED FUNDS by Charles W. Evans This dissertation was prepared under the direction of the candidate's dissertation advisor, Dr. Antoine Giannetti, Department of Finance, and has been approved by the members ofhis supervisory committee. It was submitted to the faculty of the College of Business and was accepted in partial fulfillment of the requirements for the degree of Doctor ofPhilosophy. SUPERVISORY COMMTITEE: ~e~ Dissertation Advisor 1A0 Emilio Zarruk, Ph.D. hair epartrnent ance / J. Dennis Coates, Ph.D. Dean, College of Business n--- B!71oSS:P~/??--- :J11¥l? ZJ, ?-P// Date Dean, Graduate College u ii ACKNOWLEDGEMENTS The author wishes to express his sincere thanks and love to his wife, Lina, for her support throughout the writing of this manuscript and the coursework that preceded it. The author is thankful for the unwavering encouragement of his dissertation committee members, Dr. Anna Agapova, Dr. William R. McDaniel, Dr. Ariel Viale, and especially his dissertation chairman, Dr. Antoine Giannetti, whose efforts and inspiration have been instrumental in the completion of this dissertation. The author is grateful to the chairman, Dr. Emilio Zarruk, and secretaries, Joan Schlossberg, Eileen Schneider, and Myrna Sotolongo, of the College of Business Department of Finance and Economics at Florida Atlantic University for providing financial and technical support for the research and writing of this manuscript, and to Judith Benson and Dr. Jeff Madura for their help with navigating the program. A special debt of gratitude goes to Geoff Gitlen, Will Johnson, and Steve Foerster for their camaraderie and commiseration. iii ABSTRACT Author: Charles W. Evans Title: Essays on Bond Exchange-Traded Funds Institution: Florida Atlantic University Dissertation Advisor: Dr. Antoine Giannetti Degree: Doctor of Philosophy Year: 2011 This dissertation investigates two fundamental questions related to how well exchange-traded funds that hold portfolios of fixed-income assets (bond ETFs) proxy for their underlying portfolios. The first question involves price/net-asset-value (NAV) mean-reversion asymmetries and the effectiveness of the arbitrage mechanism of bond ETFs. Methodologically, to answer the first question I focus on a time-series analysis. The second question involves the degree to which average returns of bond ETF shares respond to changes in factors that have been found to drive average returns of bond portfolios. To answer this question I shift the focus of the analysis to a cross-section asset pricing test. In other words, do bond ETF share prices track the value of their underlying assets, and are they priced by investors like bonds in the cross-section? The first essay concludes that bond ETF shares exhibit mean-reversion asymmetries when price and NAV diverge, along persistent small premiums. These premiums appear to reflect the added value that bond ETFs bring to the fixed-income iv asset market through smaller trading increments, greater liquidity, and the ability to buy on margin and sell short. The second essay concludes that market, bond-specific, and firm-specific risk factors can help to explain the variation in U.S. bond ETF average returns, but only size seems to be priced in the cross-section of expected returns. This is not surprising as the sample used in the asset pricing tests is limited to the period 2007-2010, which corresponds to the „great recession‟, and size has been interpreted in the asset pricing literature as a state variable that proxies for financial distress and is highly dependent on the phase of the real business cycle. The two essays together suggest that bond ETFs can be used in trading strategies based on taking long and short positions in fixed-income assets, especially when trading in portfolios of fixed-income assets directly is not feasible. v ESSAYS ON BOND EXCHANGE-TRADED FUNDS List of Tables viii List of Figures ix Chapter 1: Bond Exchange-Traded Funds 1 Background 3 Bond ETFs 6 ETFs vs CEFs, OEFs, and OTC 8 Comparison 8 Substitution Effects 10 Liquidity 12 Noise Traders 13 Bond ETF Trading Strategies 15 Chapter 2: Bond ETF Mean-Reversion Asymmetries 18 Introduction 19 Background 22 Empirical Framework 23 Data and Methodology 25 Data 25 Methodology 28 Test of the Law of One Price 28 vi Test of Mean-Reversion Asymmetries 29 Liquidity and Behavioral Explanatory Variables 31 Empirical Results 36 Law of One Price 36 Mean-Reversion Asymmetries 38 Expanded ECM 39 Expanded Rockets & Feathers 42 Conclusion 44 Chapter 3: Risk Factors in the Returns and Premiums of Bond ETFs 46 Introduction 47 Literature Review 50 Methodological Approach 56 Data 56 Asset Pricing Tests 57 Empirical Results 60 Stylized Time Series Properties of Bond ETF Excess Returns 60 Fama-MacBeth CSR Asset Pricing Test Results 63 Fixed Effects Static Panel Data Results 64 Concluding Remarks and Future Research 66 References 94 vii TABLES 1: Descriptive Statistics 68 2: ECM / Rockets & Feathers 71 3: Expanded ECM 73 4: Expanded Rockets & Feathers 75 5: Descriptive Statistics 77 6: Time Series: Bond Factors 79 7: Time Series: Stock and Market Factors 81 8: Time Series: Five-Factor Model 83 9: GLS 85 10: ICAPM 86 11: Panel Data 87 viii FIGURES Fig. 1: Monthly Number of Shares Outstanding (HYG) 88 Fig. 2: Monthly Percentage Growth in Shares Outstanding (HYG) 89 Fig. 3: Daily Premium/Discount (HYG) 90 Fig. 4: Bond ETF Market Growth 91 Fig. 5: ETF, CEF, OEF, OTC Comparison 92 Fig. 6: Trading Strategies 93 ix CHAPTER 1 Bond Exchange-Traded Funds Four core fixed-income exchange-traded funds (bond ETFs) were introduced in the United States in 2002 that focus on investment-grade government and corporate debt. Two more were issued in 2003, and the entire bond ETF market consisted of these six until the end of 2006. Beginning in 2007, bond ETFs have been issued that hold emerging-market, municipal, high-yield corporate, government agency, and mortgage- backed debt, with a range of maturities and risk profiles within each category. Now, retail traders, who are unable to participate actively in the bond market, are able to trade a wide variety of bond portfolios intra-day, to short-sell, and to buy on margin at a price that is close to the net asset value (NAV) and in increments that are within the budgets of retail traders. The law of one price – equating ETF share price with NAV – is expected to be enforced by the Authorized Participant (AP) arbitrage mechanism, through which large institutional investors that have entered into contractual arrangements with ETF issuers can create and redeem shares directly, in exchange for bundles of underlying assets, when price diverges from NAV. However, the magnitudes of bond ETF premiums and discounts often exceed daily bid-ask spreads in the short run, and shares exhibit small, persistent premiums, meaning that the price is more likely to exceed the reported NAV slightly than to be precisely equal to or less than NAV. 1 ETFs are designed to mimic their underlying portfolios and to trade on formal stock exchanges. However, the vast majority of the underlying assets of bond ETFs trade over the counter (OTC), which raises the question of how well bond ETFs have served as proxies for the categories of bonds in their underlying portfolios assets in these early days following their initial inception, both in terms of how well prices track corresponding NAVs and to what degree ETF share returns behave like bond returns in response to shocks in bond and stock markets. This dissertation's major contribution is to address these questions and to show that, even though bond ETFs differ from their underlying assets, their share price and return behavior have been sufficiently similar for them to be used in trading strategies in which trading in fixed-income asset portfolios is not practical or even possible. This is remarkable, considering that this early period of their existence has coincided with major turmoil in both the debt and the equity markets. Specifically, I identify persistent premiums, confirm price/NAV mean-reversion using a dynamic model, and analyze mean-reversion asymmetries that favor premiums over discounts. This last point is different from the case with closed-end funds, which tend to exhibit persistent and significant discounts, discussed in detail below. I also show that factors that have been shown in the financial literature to help to explain the cross-section of average bond returns also help to explain the cross-section of bond ETF average returns. 2 1.1. Background ETFs, like conventional open-end (OEF) and closed-end (CEF) funds, are vehicles for trading entire portfolios in single transactions. ETFs are structured to combine the best features of OEFs and CEFs. Similar to OEFs, which trade at NAV, ETFs are designed to trade at or near net asset value (NAV), and like CEFs, to trade as shares on formal exchanges (Barnhart & Rosenstein, 2009; Gastineau, 2001). Unique to the ETF market is the AP, a participant in the Depository Trust Company (DTC) that enters into a formal AP agreement with the fund's issuer and the appropriate custodian bank. The AP arbitrage mechanism causes ETF shares to be created and liquidated through in-kind transfers of underlying assets. If the underlying assets are non-transferrable, as is the case with mortgage-backed securities and Treasury Inflation-Protected Securities (TIPS), the cash equivalent is paid1. (Vanguard, 2009) With OEFs, the size of the fund varies as investors buy (sell) shares directly from (to) the issuer.