IPO重启首日超额收益实证研究

重启之后的中国证券市场,是否能有效地消除各种弊端,抑制首日超额收益过高等异常现象?文章选取我国IPO重启以后发行的新股作为样本,从信息的不对称、承销商的声誉、我国特殊的新股发行制度以及我国投资者的情绪四个角度对我国IPO重启首日超额收益现象进行实证分析,并力图从一级市场发行价格确定和二级市场交易价格形成两个环节来解释我国的IPO首日超额收益,提出一些建设性的参考意见,促进我国的上市公司对IPO进行合理定价,优化资本市场资源的配置。     

IPOs’ signalling effects for speculative stock detection: evidence from the Stock Exchange of Thailand

Using a unique data set from the Thai stock market about the so-called, ‘Turnover List (TOL)’ of speculative stocks spanning the period 2004–2012, we investigate and provide new evidence on the relationship between IPOs’ pricing effects and subsequent classification as speculative investments. To be more specific, we examine the signalling effects for the detection of speculative stocks in relation to the degree of their prior IPOs underpricing. We also employ the market-feedback hypothesis to investigate this signalling process. Our results reveal a significant positive relationship between the magnitudes of the IPO underpricing and the probability of an IPO firm being classified officially as speculative on the TOL. Furthermore, we find that a 6-month abnormal return after going public increases the probability of speculative dealing in the IPOs. Next, we consider all listed firms in the Thai stock market and highlight the role of both abnormal return and trading volume in the transmission of probability for appearing on the TOL. In addition, we find that IPOs and non-dividend paying companies further increase the risk of being on the TOL.     

中国创业板IPO首日超额收益研究

本文以58家创业板IPO公司为样本,采用类比估价模型来估计新股的内在价值。实证研究结果表明,我国创业板IPO首日超额收益源于二级市场溢价,一级市场抑价不显著;上市首日换手率、上市首日涨跌幅以及市场指数收益率显著影响我国创业板IPO首日超额收益。在此基础上,本文结合海外创业板市场经验以及我国创业板市场表现,给出了相关政策建议,对创业板市场参与者提供了可参考的投资策略。     

Information content of lock-up provisions in initial public offerings

An overwhelmingly large proportion of initial public offerings (IPOs) report lock-up provisions that prohibit existing stockholders from selling their shares within a specified period after the offering date. These lock-up periods may last as long as 3 years. Because influential buyers request the lock-up, we conjecture that the length conveys credible information pertinent to the risk of the IPO. Analyzing 729 IPOs from January 1990 to December 1992, we found that the lock-up period signals the issuer's riskiness and that a 180-day lock-up period seems to be the norm. Any departure from the norm suggests more uncertainty about a firm's value and thus results in deeper IPO underpricing as well as a larger underwriter spread. We also found that thin-trading activity occurring shortly after the expiration of the lock-up period is perceived by the market as good news, while heavy trading is regarded as bad news.     

Overreaction of Exchange-Traded Funds During the Bubble of 1998-2002

This study of overreaction is motivated by the unique characteristics of exchange-traded funds (ETFs), which should contribute to market efficiency. Since ETFs represent portfolios of stocks, they may not be as susceptible to short-term overreaction as individual stocks. In addition, they can be traded throughout the day and can be sold short, which might further limit potential overreaction. Yet, the tradability of ETFs may allow unusual pressure on ETF prices that is not initiated by price movements of all the component stocks. We find substantial overreaction of ETFs during normal trading hours (9:30 a.m. to 4 p.m.) and after hours, which presents opportunities for feedback traders. Extreme price movements of ETFs occur more frequently after hours. Yet, the after-hours correction of extreme price movements that occurred that day is more pronounced than the day correction of extreme stock price movements that occurred in the previous after-hours period, even after controlling for ETF type and other potential confounding effects. The degree of overreaction is also more pronounced for international ETFs.     

卖空机制、股价信息含量与暴跌风险--基于融资融券交易的经验证据

文章利用我国逐步推出融资融券交易的自然实验机会,运用双重差分的研究设计,考察了卖空机制对股价反映负面消息效率的影响。文章以2007-2012年的数据为样本研究发现：相对于非标的股票,融资融券标的股票在成为标的之后,其股价对市场的向下波动及时做出了调整,使得股价对市场正负向波动反应之间的不对称性显著降低,表明标的股票更加及时和充分地吸收了有关公司价值的负面信息;同时,相对于非标的股票,融资融券标的标的股票在成为标的之后,其股价暴跌风险显著降低。文章结果表明,我国股市推出融资融券交易后,卖空机制提高了市场对标的股票负面消息的定价效率。     

Individual investor’s limited attention and IPO performance

The paper models and verifies the spread and decay of investor’s attention before listing on the stock market by using the Baidu Index as a proxy for investor attention of the frequency of searches. We find that individual investor’s attention has a significant influence on the first-day IPO return. We empirically study the allocation of investor attention among several stocks and discover that the more stocks going public on the same day, the milder and more similar their performance tends to be. This paper is the first to research IPO performance and individual attention.     

风险投资与中国IPO公司盈余管理行为的实证研究——基于深圳和香港创业板的数据

本文以2009—2011年间在我国深交所创业板上市的276家以及2002—2011年在港交所创业板上市的108家IPO公司为样本,对风险投资与盈余管理之间的关系进行研究,旨在揭示我国深圳创业板和香港创业板两个市场上,风险投资是否可以约束IPO过程中的盈余管理行为,两个市场上风投的影响程度是否相同。研究发现,在两个创业板市场上,都显著存在正向盈余管理行为,但是风险投资并没有起到认证监督作用,即没有显著抑制上市公司盈余管理行为,风险投资功效在中国市场不显著。     

行业收益、国际航运业IPO与船舶融资选择——基于1984～2007年数据分析

在阐述行业收益差异基础上分析影响航运股权融资因素,针对航运企业IPO的不同表现特征选取了1984～2007年间,在主板证券交易所首次发行股票的143家全球航运企业,通过计算超常持有期收益率(BHAR)和累计超常收益率(CAR),分析其短期与长期价格表现。认为航运企业首次公开发行抑价与公司年龄、上市所在交易所的声誉和发行期间市场行情正相关,与承销商声誉负相关;从长期来看,航运企业首次公开发行五个月后表现欠佳。希望通过研究某些体制因素如何影响航运企业IPO抑价,以期对船舶融资选择提供相关建议。     

Financial characteristics of Australian initial public offerings from 1994 to 1999

A variety of financial characteristics of Australian initial public offerings (IPOs) for the period 1994–1999 are explored. A number of previous Australian studies have investigated the initial day underpricing and longer term underperformance of IPOs and this study updates those papers. This paper partitions the IPO data into no liability/limited liability; share option/no share option; underwriter option/no underwriter option and dividend reinvestment/no dividend reinvestment characteristics to better understand the types of IPOs that list on the Australian Stock Exchange. The data supports the findings of previous studies in that IPOs are underpriced at the time of listing and underperform the market in the first year following their listing.     

中国询价制度下询价对象的报价行为——基于IPO网下申购报价特征的实证分析

利用2010—2012年中国A股443家询价对象的45630组详细报价的微观数据,构建了"信息优势"询价对象与"信息劣势"询价对象的平均报价之差的代理变量,使用Ordered-probit模型,对中国询价制度下A股市场中是否存在"赢者诅咒"假说进行了检验。进而利用询价阶段的详细报价数据,构建了3个衡量机构投资者审慎报价的代理变量,实证检验了中国第三阶段新股发行制度改革对询价对象报价行为的影响。研究结果表明:"信息优势"投资者与"信息劣势"投资者的平均报价之差与IPO首日抑价率成正比;中国证监会于2012年5月实施新股发行制度改革,显著提高了询价对象报价的审慎程度;导致新股发行抑价率高的主要因素仍是二级市场炒作。     

What causes the IPO underpricing? New evidence from China’s SME market

ABSTRACT

We study 10-year IPO initial returns in China’s small and medium-sized enterprise (SME) board between 2006 and 2016, including 755 IPO samples. At the same time, we test how policy changes of IPO pricing and trading mechanism affect first-day initial returns. Our article adopts the stochastic frontier approach to estimate the fair value of IPOs and decompose the components of deliberate underpricing and mis-valuation factors, then using linear regressions investigate correlation between first-day initial returns and deliberate underpricing or mis-valuation factors. We find it is mis-valuation factors, especially, the irrational behaviour of individual investors that mainly cause the IPO underpricing in China’s SME market rather than deliberate underpricing. Besides, influenced by IPO pricing policies, the characteristic of IPO pricing varies from period to period.     

The Availability Heuristic and Reversals Following Large Stock Price Changes

The author explores the effect of the availability heuristic on large daily stock price changes and on subsequent stock returns. He hypothesizes that if a major positive (negative) stock price move takes place on a day when the stock market index rises (falls), then its magnitude may be amplified by the availability of positive (negative) investment outcomes. In both cases, the availability heuristic may cause price overreaction to the initial company-specific shock, resulting in subsequent price reversal. In line with the hypothesis, the author documents that both positive and negative large price moves accompanied by the same-sign contemporaneous daily market returns are followed by significant reversals on the next 2 trading days and over 5- and 20-day intervals following the event, the magnitude of the reversals increasing over longer postevent windows, while large stock price changes taking place on the days when the market index moves in the opposite direction are followed by nonsignificant price drifts. The results remain robust after accounting for additional company (size, beta, historical volatility) and event-specific (stock's return and trading volume on the event day) factors, and are stronger for small and volatile stocks.     

IPO股票上市初期投资者交易行为研究

区别于国内以股票价格为对象揭示IPO股票特征的研究,文章以投资者为研究对象,研究中国IPO股票上市初期机构和个人投资者的交易行为差异。IPO交易研究是目前IPO研究的一个前沿领域。文章利用沪深股市2002年IPO股票的账户交易数据建立Logistic回归模型发现,中国IPO股票上市首日的高成交量与高换手率由投资者逐利行为造成;在上市后3日的交易中,个人投资者由于资金限制和信息获取能力不足等原因,对股票收益的判断能力明显弱于机构投资者,在交易中被机构投资者所利用。     

中国各省区市创业板上市公司分布与GDP的关系分析

分别计量分析了各省区市创业板上市公司的数量、总市值、总利润、平均市盈率与各省区市GDP总量和人均值的关系,发现创业板上市公司的数量、总市值的区域分布主要与各区域的GDP总量和人均值有较大的关系,而创业板上市公司总利润、平均市盈率与GDP总量和人均值的关系强度较弱。创业板上市公司的上市数量在各省区市之间的分配,可能主要不是依赖于各创业型公司的质量。有计划成为创业板上市公司的企业,若注册在GDP总量或人均值比较靠前的东部省份,其成功上市的概率更高。     

Detecting hot and cold cycles using a Markov regime switching model—Evidence from the Chinese A-share IPO market

This paper focuses on detecting hot and cold IPO cycles in the Chinese A-share market using a Markov regime switching model. We introduce a set of observations to measure IPO activities, which include numbers of IPOs issued, levels of underpricing, market conditions and duration time from prospectus and listing, and thus establish a model to estimate these activities' average performance in hot and cold periods respectively. It is found that a hot period is related with an abundant supply of IPOs, high levels of underpricing, positive market conditions and short waiting time to listing after prospectus issue. Further, this paper depicts the turning points of hot and cold periods across the period from 1994 to 2005 for each observation. The cycles detected by the number of IPOs per month are the benchmark and then these cycles' robustness is tested by the other observations.     

Price Clustering of Chinese IPOs: The Impact of Regulation,Cultural Factors,and Negotiation

During June 2009–May 2012, the China Securities Regulatory Commission (CSRC) suspended window guidance that limits issue prices. Using this regime change as a natural experiment, we test the combined effects of regulation, culture, and negotiation on price clustering of Chinese IPOs. The proportion of IPOs priced on round number 0 increases from 42.58% during sample periods with window guidance to 79.81% during sample period without window guidance, a level similar to that reported in developed markets . Moreover, we document a connection between whole CNY pricing of Chinese IPOs and several uncertainty measures including a unique uncertainty proxy defined as the time gap between the IPO date and the listing date. Second to the round number 0, issuing firms favour number 8 that associates with fortune, particularly during sample periods with window guidance. Our findings that price restrictions limit the power of negotiations but not the influence of cultural factors contributing to the understanding of price formation process.     

T+1 trading mechanism causes negative overnight return

The T+1 trading mechanism is unique in the Chinese stock market, thus providing a natural experimental field to study the trading mechanism and price behaviors. This paper proposes and proves that T+1 trading mechanism causes negative overnight return, the overnight return can serve as a proxy of the T+1 trading mechanism. The paper finds that the overnight return of the Chinese stock market is significantly negative, whereas those under the T+0 trading mechanism, such as China’s stock index futures, Hong Kong stocks, and major international indices, all have around 0 or positive overnight returns. T+1 trading mechanism has greater impacts on stocks with more divergent investor opinions, higher risk, more individual investor percentages, higher arbitrage restrictions, and less liquidity. The T+1 trading mechanism distorts the price generation mechanism of stocks. The paper contributes to the understanding of impact of trading mechanism on stock prices.