Do IPO index portfolios improve the investment opportunities for mean–variance investors?

We set out in this study to examine whether investors can improve their investment opportunity sets through the addition of an IPO index portfolio into various sets of benchmark portfolios. Using the IPOX indices from the years 1980–2006, we find that adding an IPO index portfolio does lead to a statistically significant enlargement of the investment opportunity set for investors. Our empirical findings are robust, demonstrating that there is scope for the further development of financial products relating to IPO stocks, since investors can gain diversification benefits through investing in such IPO-related products.     

The diversification effects of volatility-related assets

We examine whether investors can improve their investment opportunity sets through the addition of volatility-related assets into various groupings of benchmark portfolios. By first analyzing the weekly returns of three VIX-related assets over the period 1996-2008 and then applying mean-variance spanning tests, we find that adding VIX-related assets does lead to a statistically significant enlargement of the investment opportunity set for investors. Our empirical findings are robust and have two implications. First, there is scope for the further development of financial products relating to volatility indexes. Second, hedge fund managers can utilize VIX futures contracts or VIX-squared portfolios to enhance their equity portfolio performance, as measured by the Sharpe ratio.     

Underpricing and long-term performance of IPOs in China

We study the underpricing and long-term performance of A- and B-share initial public offerings (IPOs) issued in China during the 1993–1998 period. The average underpricing for A- and B share IPOs are 178% and 11.6%, respectively. The underpricing of A-share IPOs is positively related to the number of days between the offering and the listing and the number of stock investors in the province from which the IPO comes, and negatively related to the number of shares being issued. None of these characteristics explain the underpricing of B-share IPOs. In the long run, A-share IPOs slightly underperform the size- and/or book/market (B/M)-matched portfolios while B-shares outperform the benchmark portfolios.     

IPOs,clustering, indirect learning and filing independently

IPO underpricing has been attributed to valuation uncertainty, which can be at least partially resolved by the indirect learning associated with IPO clustering [Benveniste, L.M., Ljungqvist, A., Wilhelm, W.J., Yu, X.Y., 2003. Evidence of information spillovers in the production of investment banking services. Journal of Finance 58, 577–608]. We examine why firms might choose not to issue their IPOs contemporaneously with clusters of similar firms, forgoing opportunities to learn from their peers. We find that the willingness to file an IPO without the benefit of indirect learning from peer firm IPOs is directly related to insiders’ needs for portfolio diversification and the firm’s need to raise capital.     

Performance and diversification benefits of IPO-focused mutual funds

We investigate whether mutual funds that invest in initial public offerings (IPOs) outperform the Renaissance IPO Index, IPOX® 100 U.S. Index, and other comparable equity funds that do not invest in IPOs. We also explore whether investors gain diversification benefits by investing in IPO-focused mutual funds. Using a sample of active open-ended US equity mutual funds, we find that IPO-focused funds outperform the Renaissance IPO Index and comparable funds that do not invest in IPOs. Moreover, they provide investors with the benefit of diversification along with better returns. We also find the value added by active management based on IPO strategy.     

The introduction of the Euro and its effects on portfolio decisions

Examining investment behavior related to the Euro introduction, we address the relevance of different investment determinants. With the advent of the currency union two potential sources of portfolio reallocation can be distinguished: First, the diminishment of exchange rate risk and transaction costs within the EMU. Second, the increase of correlation of EMU returns so that diversification benefits decreased. We test for structural breaks in the holdings of German investors and estimate a market model to account for the two effects. A significant decrease in national and an increase in EMU and rest-of-the-world investments can be observed. Comparing the observed holdings with benchmark portfolios, we find that investment home bias has diminished since the Euro introduction.     

Long-run stock performance of German initial public offerings and seasoned equity issues

We estimate the long-run stock performance after initial public offerings (IPOs) in the German capital market with a larger sample than prior studies and alternative benchmarks (the equally and the value-weighted market portfolio, size portfolios and matching stocks). In addition we present the first results on the long-run performance after seasoned equity issues (SEOs) in Germany. We conclude that size portfolios and matching stocks are better benchmarks than market portfolios. Using buy‐and-hold abnormal returns, we estimate that German stocks involved in an IPO or in a SEO, on average, underperform a portfolio consisting of stocks with a similar market capitalization by 6% in three years. This is considerably less than the underperformance after IPOs and SEOs in the US market reported by Loughran and Ritter (1995) and the underperformance after IPOs in Germany reported by Ljungqvist (1997). We also show that the apparent underperformance of the 1988–1990 IPO cohort discussed by Ljungqvist (1997) disappears when the abnormal performance estimate is based on size instead of market portfolios.     

Does a Held-to-Maturity Strategy Impede Effective Portfolio Diversification for Islamic Bond (Sukuk) Portfolios? A Multi-Scale Continuous Wavelet Correlation Analysis

There is a critical gap in the literature in studying the portfolio diversification opportunities available to sukuk investors and evaluating these in light of held-to-maturity strategies usually adopted by these investors. This article has made an initial attempt to study the portfolio diversification strategies for sukuk portfolios across heterogeneous investment horizons. Our findings critically indicate that returns between local currency sukuk in different markets generally have low levels of correlations across different investor holding periods, thus enabling both short and long-run portfolio diversification benefits. However, in contrast, international currency sukuk issued in different markets exhibits high levels of correlations in the longer-term investor holding periods. Also, in the domestic market context, returns on different classes of domestic sukuk are found to exhibit strong correlations in the longer-holding periods. Our findings critically highlight the feasibility of held-to-maturity sukuk investment strategies from a portfolio diversification perspective.     

Bookbuidling, Auctions, and the Future of the IPO Process

Auction theorists predict that bookbuilding, long the standard process for selling equity IPOs in the U.S., is about to give way to an Internet‐based IPO auction process that is both more efficient and more fair. The promise of auctions is that, by using an electronic platform that gives all investors the opportunity to bid on IPOs, the underpricing of IPOs and commissions to underwriters will be reduced, leading to an increase in net proceeds to issuers. Largely missing from such arguments, however, is an appreciation of why bookbuilding has dominated U.S. practice (and continues to supplant auctions in IPOs in most countries outside the U.S) and the role of undepricing in the IPO process. Rather than canvassing all investors, bookbuilding involves eliciting expressions of interest from institutional investors, and then allocating shares mainly according to the strength of their professed interest. In contrast to auctions, which allocate shares according to a set of explicit rules, bookbuilding involves a set of implicit “rules” that provide considerable room for judgment by the underwriter. This does not mean that the rules are arbitrary or not well understood by participants, particularly after thousands of IPOs conducted over the better part of two centuries. But to manage the exchange of information between issuers and investors, and the potential conflicts of interest in representing both groups, such rules must be administered by an intermediary with a considerable stake in protecting its reputation for fair dealing. Investment banks that deal with both issuers and the investment community on a regular basis are well positioned to perform this function. The underpricing of IPOs is best viewed not as a transfer of wealth from issuers to favored investors but rather as compensation to the large influential investors that play a major role in the price discovery process. By opening the process to all comers, auctions will discourage these large investors from bidding aggressively because less sophisticated investors will be able to “free ride” on their research and due diligence. To the extent this happens, auctions may suc ceed in reducing underpricing (in fact, they may even lead to over pricing), but they will also reduce the net proceeds for issuers. Nevertheless, recent advances in communications technology and auction theory will undoubtedly reshape current securities underwriting practices. In particular, Internet auctions are likely to replace bookbuilding in debt IPOs and less risky equity issues (say, IPOs of LBOs). But the argument that Bookbuilding will be completely cast aside in favor of largely untested alternatives fails to appreciate a successful institutional response to major market imperfections, some of which can never be wholly eliminated. Especially in the case of risky (first‐time) equity IPOs, there will continue to be an important role for managing the information exchange between issuers and investors that is critical to the IPO process.     

DIVERSIFICATION AND SKEWNESS IN OPTION PORTFOLIOS

Skewness in returns is relevant to option investors. Because options possess positively skewed distributions, the traditional maxim of diversification, which can destroy positive skewness, is not necessarily consistent with investment objectives. The results indicate that the majority of skewness in option portfolios is diversified with a relatively small portfolio size, suggesting a strategy of antidiversification for option investors. Even though the investment performance of options is inferior to stocks on a risk-return basis, the data indicate the suitability of option portfolios in an environment where an investor's utility is measured by the return, risk, and skewness of the return distribution.     

投资银行-机构投资者关系、“捧场”与IPO中的利益问题

投资银行是直接融资过程中最重要的中介机构,作为融资产品的“卖方”代表,其核心竞争力源于它所构建的投资者关系网络,但现有文献对于投行-投资者关系在证券发行中的作用还缺乏系统的实证研究。本文利用机构投资者在中国IPO新股发行中的完整询价记录,基于报价参与和报价水平两个维度提出了一种新的动态关系强度测算方法,并由此细致刻画了投行-机构关系对股票发行、定价的作用机制。结果发现:(1)投行可以驱动关系机构主动认购其承销的IPO新股,并引导关系机构给出与投行估值水平保持一致的高位报价,进而有效缓解了IPO拍卖制下的“投资者参与不确定性问题”。(2)关系机构的捧场报价显著提高了股票发行价格、增加了投行的承销收入;但是当新股交易价格在长期内逐渐向其内在价值水平收敛时,受到关系机构捧场支持越多的IPO新股,其长期回报率相对越低。(3)投行与机构的关系在本质上是互惠的,一旦投行被赋予新股分配权力,它明显倾向于将新股抑价发行带来的巨大利益分配给在前期捧场的关系机构,二者的关系越强,机构报价被认定为“有效报价”的概率越高,而一旦被认定为有效报价,关系机构的新股需求更是将被优先满足。     

Liquidity risk,leverage and long-run IPO returns

We examine the risk-return characteristics of a rolling portfolio investment strategy where more than 6000 Nasdaq initial public offering (IPO) stocks are bought and held for up to 5 years. The average long-run portfolio return is low, but IPO stocks appear as “longshots”, as 5-year buy-and-hold returns of 1000% or more are somewhat more frequent than for non-issuing Nasdaq firms matched on size and book-to-market ratio. The typical IPO firm is of average Nasdaq market capitalization but has relatively low book-to-market ratio. We also show that IPO firms exhibit relatively high stock turnover and low leverage, which may lower systematic risk exposures. To examine this possibility, we launch an easily constructed “low-minus-high” (LMH) stock turnover portfolio as a liquidity risk factor. The LMH factor produces significant betas for broad-based stock portfolios, as well as for our IPO portfolio and a comparison portfolio of seasoned equity offerings. The factor-model estimation also includes standard characteristic-based risk factors, and we explore mimicking portfolios for leverage-related macroeconomic risks. Because they track macroeconomic aggregates, these mimicking portfolios are relatively immune to market sentiment effects. Overall, we cannot reject the hypothesis that the realized return on the IPO portfolio is commensurable with the portfolio's risk exposures, as defined here.     

Should investors include Bitcoin in their portfolios? A portfolio theory approach

Many papers in recent years have examined the benefits of adding alternative assets to traditional portfolios containing stocks and bonds. Bitcoin has emerged as a new alternative investment for investors which has attracted much attention from the media and investors alike. However relatively little is known about the investment benefits of Bitcoin and therefore this paper examines the benefit of including Bitcoin in a traditional benchmark portfolio of stocks and bonds. Specially, we employ data up to June 2018 and analyse the potential out-of-sample portfolio benefits resulting from including Bitcoin in a stock-bond portfolio for a range of eight popular asset allocation strategies. The out-of-sample analysis shows that, across all different asset allocation strategies and risk aversions, the benefits of Bitcoin are quite considerable with substantially higher risk-adjusted returns. Our results are robust to rolling estimation windows, the incorporation of transaction costs, the inclusion of a commodity portfolio, alternative indices, short-selling as well as two additional optimization techniques including higher moments with (and without) variance-based constraints (VBCs). Therefore, our results suggest that investors should include Bitcoin in their portfolio as it generates substantial higher risk-adjusted returns.     

Institutional investors: Arbitrageurs or rational trend chasers

This paper studies the relationship between institutional investor holdings and stock misvaluation in the U.S. between 1980 and 2010. I find that institutional investors overweigh overvalued and underweigh undervalued stocks in their portfolio, taking the market portfolio as a benchmark. Cross-sectionally, institutional investors hold more overvalued stocks than undervalued stocks. The time-series studies also show that institutional ownership of overvalued portfolios increases as the portfolios' degree of overvaluation. As an investment strategy, institutional investors' ride of stock misvaluation is neither driven by the fund flows from individual investors into institutions, nor industry-specific. Consistent with the agency problem explanation, investment companies and independent investment advisors have a higher tendency to ride stock misvaluation than other institutions. There is weak evidence that institutional investors make a profit by riding stock misvaluation. My findings challenge the models that view individual investors as noise traders and disregard the role of institutional investors in stock market misvaluation.     

Optimal delegated portfolio management with background risk

Most investors delegate the management of a fraction of their wealth to portfolio managers who are given the task of beating a benchmark. However, in an influential paper [Roll, R., 1992. A mean/variance analysis of tracking error. Journal of Portfolio Management 18, 13–22] shows that the objective functions commonly used by these managers lead to the selection of portfolios that are suboptimal from the perspective of investors. In this paper, we provide an explanation for the use of these objective functions based on the effect of background risk on investors’ optimal portfolios. Our main contribution is to provide conditions under which investors can optimally delegate the management of their wealth to portfolio managers.     

International diversification and Microfinance

International commercial banks, institutional investors, and private investors have become increasingly interested in financing microfinance institutions (MFIs). This paper investigates whether adding microfinance funds to a portfolio of risky international assets yields diversification gains. By using mean-variance spanning tests with short-sale constraints, we find that investing in microfinance may be attractive for investors seeking a better risk-return profile. Specifically, the analysis suggests that investing in MFIs from Latin America, or microfinance and rural banks yields more efficient portfolios. In contrast, adding MFIs from Africa or microfinance NGOs to a portfolio of international assets is not beneficial for a mean-variance investor.     

IPO限价发行与新股二级市场价格泡沫——论股票市场“弹簧效应”

本文通过对比2009年7月1日至2014年6月30日IPO市场化定价发行阶段与2014年7月1日至2018年6月30日IPO限价发行阶段共1950个IPO样本,发现IPO限价发行对于新股在二级市场股价表现具有“弹簧效应”:即抑制股票一级市场发行价格会造成新股在二级市场价格短期内超涨,限价发行新股的二级市场定价显著高于市场化定价发行新股的二级市场定价。限价发行引起的过高二级市场定价最终导致股票长期回报率低下。另外,创业板公司“弹簧效应”显著强于主板公司。这些实证结果都可以被本文提出的一级市场价格压抑造成二级市场非理性投资者上涨预期一致、盲目追涨的理论模型所解释。本文的研究指出抑制股票一级市场定价虽然形式上可以解决新股发行价过高问题,但是却造成二级市场更大的价格扭曲。这一发现为进一步完善我国IPO发行定价机制提供了依据。     

On the investment credentials of Bitcoin: A cross-currency perspective

We examine diversification capabilities of Bitcoin for a global portfolio spread across six asset classes from the standpoint of investors dealing in five major fiat currencies namely US Dollar, Great Britain Pound, Euro, Japanese Yen and Chinese Yuan. Considering the period of prolonged decline in Bitcoin’s value throughout 2018, we employ modified conditional value-at-risk and standard deviation as measures of risk to perform portfolio optimisations across three asset allocation strategies. Results show that portfolios denominated in Japanese Yen, Chinese Yuan and US Dollar account for greater proportion of optimal investment in Bitcoin and exhibit higher improvement in risk-adjusted returns due to investment in Bitcoin. We also perform a comprehensive risk-adjusted evaluation of portfolios with and without Bitcoin to reinforce striking variation in degree of diversification benefits of Bitcoin in a cross-currency context. Taken together, our findings provide insights into sharp disparity in Bitcoin trading volumes across national currencies from a portfolio theory perspective.     

A dynamic model of active portfolio management with benchmark orientation

This paper studies optimal dynamic portfolios for investors concerned with the performance of their portfolios relative to a benchmark. Assuming that asset returns follow a multi-linear factor model similar to the structure of Ross (1976) [Ross, S., 1976. The arbitrage theory of the capital asset pricing model. Journal of Economic Theory, 13, 342–360] and that portfolio managers adopt a mean tracking error analysis similar to that of Roll (1992) [Roll, R., 1992. A mean/variance analysis of tracking error. Journal of Portfolio Management, 18, 13–22], we develop a dynamic model of active portfolio management maximizing risk adjusted excess return over a selected benchmark. Unlike the case of constant proportional portfolios for standard utility maximization, our optimal portfolio policy is state dependent, being a function of time to investment horizon, the return on the benchmark portfolio, and the return on the investment portfolio. We define a dynamic performance measure which relates portfolio’s return to its risk sensitivity. Abnormal returns at each point in time are quantified as the difference between the realized and the model-fitted returns. Risk sensitivity is estimated through a dynamic matching that minimizes the total fitted error of portfolio returns. For illustration, we analyze eight representative mutual funds in the U.S. market and show how this model can be used in practice.     

Fare Thee Well? An Analysis of Buyout Funds’ Exit Strategies

This paper analyzes exit strategies of buyout funds in portfolio companies following initial public offerings (IPOs). We use a data set of 222 buyout‐backed IPOs in the United States from 1999 to 2008, including hand‐collected data about each exit process, to draw a detailed roadmap of buyout investors’ divestment processes. Using this data, we document the timing and aggressiveness of the exit strategies, and analyze to which degree a multitude of possible determinants influence the choice of a given exit strategy. Our results indicate that buyout funds remain invested in their portfolio companies for a substantial period of time after the IPO, and that the choice of a given exit strategy depends not only upon the characteristics of each respective portfolio company, but also on the financial success of the deal from the perspective of the buyout investor.