融资融券交易与市场价格发现——基于盈余公告漂移的实证分析

融资融券的推出是中国证券市场交易制度的一次结构性的变革,本文以第一批可以融资融券的90只股票为样本,选取盈余公告漂移异象作为研究标的,从理论和实践角度检验融资融券推出对市场价格发现的影响作用.我们发现,融资融券的推出使得投资者有更多的选择和手段对市场信息做出及时反应,A股市场的一个市场异象盈余公告漂移在融资融券后有显著减弱.最后本文利用融资融券制度的可卖空和杠杆交易特征构造了基于盈余漂移的交易策略.     

资本市场开放与尾部系统风险——来自A股“入摩”的准自然实验证据

我国A股纳入MSCI新兴市场指数是我国进一步开放资本市场的重要标志。首先运用SJC Copula方法提取个股与市场的极值相依结构,然后基于A股“入摩”这一准自然实验,运用多时点DID方法研究资本市场开放对股票市场尾部系统风险的非对称影响。研究发现,A股“入摩”提高了标的个股左尾系统风险,而对标的个股右尾系统风险的影响不具有显著性。进一步分析发现,A股“入摩”初期会增加我国股市的暴涨暴跌风险,但后续A股“入摩”增加尾部风险的负面效应不再具有显著性;而且股票定价效率和公司治理水平在A股“入摩”提高标的个股左尾系统风险的关系中均存在显著的负向调节效应。研究既丰富了我国资本市场开放的理论研究,也为我国积极推进A股纳入MSCI指数提供了理论支持。     

资本市场国际融合与公司审计收费——来自A股纳入MSCI指数的经验证据

近年来，我国资本市场的市场化进程逐步加快，与国际资本市场的融合是其中关键一环。基于A股纳入MSCI指数的外生事件，我们检验了资本市场国际融合对公司审计收费的影响。本文利用2014-2020年我国A股上市公司数据，通过构建动态双重差分模型，研究发现，A股标的公司被纳入MSCI指数后，会计师事务所的审计收费显著下降。进一步分析显示，资本市场国际融合对审计收费的影响在非交叉上市公司、非国有企业和融资融券标的公司中更显著。基于作用机制的分析表明，纳入MSCI指数的A股标的公司，其跟踪的证券分析师增加，机构投资者调研增多，外资持股比例上升，并且内部控制质量提高。研究的结论有助于认识我国资本市场国际融合的经济后果，也为了解公司审计收费的影响因素提供了经验证据。     

资本市场国际化如何提高股价信息含量——基于A股纳入MSCI指数的准自然实验

随着金融加快扩大开放和资本市场改革的全面深化,资本市场双向开放驶入快车道.A股纳入MSCI指数是中国资本市场走向国际化的一个重要标志.为探究资本市场国际化对股价信息含量的影响,本文以A股纳入MSCI指数这一事件为准自然实验,基于2014-2020年的股票样本,使用双重差分法进行了实证分析.实证结果表明:与未纳入MSCI指数的股票相比,纳入MSCI指数能显著增加股价中的信息含量;进一步分析发现,资本市场国际化对股价信息含量的影响是通过公司信息环境和治理水平传导,两个影响路径均存在部分中介效应;对比国有企业与非国有企业的子样本检验结果,发现纳入MSCI指数对非国有企业股价信息含量的提升程度更大.因此,在做好防范金融风险工作的同时,建议进一步加快资本市场开放,完善上市公司信息披露和内部治理机制,放宽民营企业市场准入标准,助力经济高质量发展.     

中国股市融资融券标的股票“异质性波动率之谜”研究

本文研究了中国A股市场融资融券标的股票的"异质性波动率之谜",分别在我国融资融券制度推行初期和后期,构建了两阶段的双重差分回归模型,比较融资融券制度的政策效果。实证结果表明,在融资融券制度推行初期,两融标的股票"异质性波动率之谜"现象未能得到有效抑制。融资融券制度推行后期,A股市场融券交易总量快速增长,融资融券标的股票的"异质性波动率之谜"现象相对非融资融券股票得到明显抑制,这一抑制效应对于融券交易活跃的股票更为显著,说明融券交易的活跃程度对于抑制融资融券标的股票"异质性波动率之谜"现象起主要作用。     

卖空交易与股票价格稳定性--来自中国融资融券市场的自然实验北大核心CSSCISSCI

基于2009年4月-2013年12月我国殷票市场的数据,本文研究了融资融券标的股票和非标的股票、以及股票被列入和剔出融资融券标的前后的价格波动特征。结果表明,融资融券交易机制的推出有效提高了我国股票价格的稳定性,融资融券标的股票的价格波动率和振幅均出现了显著性下降。我们还发现,融资融券交易显著降低了股票价格的跳跃风险,有利于防止股票价格的暴涨暴跌和过度投机。此外,融资融券交易在抑制股票价格异质性波动上也起到了实质性作用,从而有助于增加上市公司信息透明度和市场信息效率。     

融资融券交易提升了股市流动性吗?——来自A股市场的经验证据

融资融券交易对股市流动性的影响尚未形成一致结论,不过大多数学者的研究结论认为融资融券将提升股市流动性。本文基于沪深市场个股交易数据得出的实证结果表明:融资融券标的股票的流动性要显著高于非融资融券标的股票,融资融券交易对于个股流动性有着显著的提升作用,并且主要体现为融资买空对流动性的提升作用,而融券卖空对于流动性的提升作用并不明显。此外,融资融券交易事件日前后个股流动性的对比结果显示:融资融券交易推行后,个股的流动性水平较之前有了显著提高。之后应继续完善融资融券交易制度,促进融资和融券业务均衡发展。     

A股上市公司融资租赁公告效应实证研究

以2007—2015年A股发布融资租赁业务公告的上市公司为研究对象,采用事件研究法实证研究融资租赁公告效应。结果表明:A股上市公司融资租赁公告能够带来显著为正的超额收益;截面回归数据表明融资租赁公告的超额收益与税率弱相关、与破产成本显著负相关、与关联交易行为显著正相关;债务互补型的公司开展融资租赁业务会降低公司的价值,信息不对称问题并不会对融资租赁超额收益产生明显影响。     

融资融券交易提高股票市场定价效率了吗?——基于A股市场固定效应模型与DID检验的准自然实验

融资融券交易制度作为一项重要金融创新,至今经历了六次标的扩容,使我国股票市场有了较好的信用交易机制。本文以我国A股第五次与第六次融资融券扩容标的为研究对象,用固定效应模型和双重差分模型实证检验融资融券交易制度对上市公司股票定价效率的多方面影响。研究表明,融资融券交易实施后定价效率有所提高,股价对新信息的反应速度和程度有所增加,但效应较弱。本文在此研究基础上针对更好发挥融资融券交易制度积极意义提出几点政策建议。     

A股已站在MSCI门外

<正>据MSCI(MSCI是中国指数MSCIChinaIndex的英语缩写,由摩根斯丹利国际资本公司编制的跟踪中国概念股票表现的指数)股票指数半年度评估公告,MSCI中国指数成份股新增新浪、微博等7支,MSCI中国A股指数成份股新增44支。而A股纳入MSCI新兴市场指数并未在此次调整中提及。这意味着MSCI再次将中国A股拒于门外。MSCI指数是国际投资的风向标,也是全球影响力最大的股票指数,共有9.5万亿美元资产追踪其指数。它不仅拥有最为完整和广泛的指数体系,而且在编制方法上也有不可     

Are Investors Concerned with Stock Market Upgrades? Evidence from Multivariate Framework Analysis

This study aims to examine the return and volatility responses to the announcement of stock market upgrades. It measures the direct effects of the recent Morgan Stanley Capital International (MSCI) upgrade of the Qatar, Dubai, and Abu Dhabi stock exchanges from frontier to emerging markets by applying a nontraditional dummy variable event study using multivariate BEKK and DCC GARCH models. The results show clear evidence that contradicts the free information hypothesis and supports the price pressure hypothesis. Initially, the MSCI upgrade led to positive feedback from active investors due to the belief that this announcement will attract foreign institutional investors who play a vital role in improving the market’s performance.     

Does Cross-Listing Really Enhance Market Efficiency for Stocks Listed in the Home Market? The Perspective of Noise Trading in the Chinese Stock Market

The investor recognition hypothesis and the bonding hypothesis, which help us understand the market quality of stocks that are cross-listed on different stock markets, imply improved market efficiency after cross-listing because of increased investor participation. However, the noise trading of inexperienced investors in the Chinese stock market negatively affects market efficiency. By employing propensity score matching and multivariate regression analysis, we show that the increased individual investor participation actually lowers market efficiency in their home market after cross-listing. This effect is more evident for stocks that were either listed first on the Chinese stock market or listed on the Chinese stock market and the Hong Kong stock exchange (SEHK) on the same date than for stocks that were listed first on the SEHK.     

卖空者与内幕交易——来自中国证券市场的证据

本文研究上市公司内部人减持、年报、诉讼、分析师评级、停复牌以及高送转等重大公告前后卖空交易行为的变化,系统考察卖空者是否参与内幕交易以及何种因素影响卖空者参与内幕交易,发现卖空率较高的股票具有较低的未来收益,表明卖空者拥有信息优势,属知情交易者;卖空者拥有非常精确的择时交易能力,在重大利空公告前显著增加卖空量,而在利好公告前则显著减少卖空头寸,表明卖空者作为知情交易者的信息优势源自内幕消息;公司内、外部投资者的信息不对称程度越低或公司所在地的法治水平越高,卖空者参与内幕交易的行为就越少。因此,监管机构应密切关注公司重大消息发布前后卖空量的异常变动,同时,完善信息披露规则、健全证券分析师制度并强化法律法规的执行力度,才能有效防范卖空者参与内幕交易。     

投资者关注与市场反应——来自中国证券交易所交易公开信息的自然实验

涨停的股票能否被交易公开信息披露取决于收益率排名中的随机因素,与股票的基本面特征无关。本文利用这一机制设计自然实验检验了投资者关注对股价的影响。实证结果显示交易公开信息披露使股票受到投资者更多的关注,增加了小额资金的净流入,减少了大额资金的净流入和股价的短期收益率,抑制了股价短期波动率,同时降低了股价在长期发生反转的可能性。频繁登上交易公开信息的知名营业部买入的股票受到更多关注,相应的市场反应也更加显著。进一步的研究表明监管性信息披露引发的投资者关注通过降低市场信息不对称抑制了股价反转。     

Good News for Value Stocks: Further Evidence on Market Efficiency

This article examines the hypothesis that the superior return to so-called value stocks is the result of expectational errors made by investors. We study stock price reactions around earnings announcements for value and glamour stocks over a 5-year period after portfolio formation. The announcement returns suggest that a significant portion of the return difference between value and glamour stocks is attributable to earnings surprises that are systematically more positive for value stocks. The evidence is inconsistent with a risk-based explanation for the return differential.     

UNLISTED TRADING PRIVILEGES,LIQUIDITY, AND STOCK RETURNS

In this study we examine the effect of dual trading through unlisted trading privileges (UTPs) on liquidity and stock returns. Stocks with UTPs trade in a different market structure than stocks listed and traded only on the AMEX and NYSE. Differences in market structure may affect stock returns through liquidity services provided by the competing markets. The sample comprises 852 AMEX and NYSE firms that began unlisted trading on the Philadelphia, Pacific, Midwest, or Cincinnati exchanges between 1984 and 1988. The results show significantly positive abnormal returns around the SEC's announcement of a regional exchange's filing for UTPs. The results also suggest that increased competition improves trading liquidity. Only stocks with low liquidity before UTPs announcements experience significantly improved liquidity and positive stock returns.     

Informed Trading around Merger Announcements: An Empirical Test Using Transaction Volume and Open Interest in Options Market

This paper provides empirical evidence on the level of trading activity in the stock options market prior to the announcement of a merger or an acquisition. Our analysis shows that there is a significant increase in the trading activity of call and put options for companies involved in a takeover prior to the rumor of an acquisition or merger. This result is robust to both the volume of option contracts traded and the open interest. The increased trading suggests that there is a significant level of informed trading in the options market prior to the announcement of a corporate event. In addition, abnormal trading activity in the options market appears to lead abnormal trading volume in the equity market. This finding supports the hypothesis that the options market plays an important role in price discovery.     

Abnormal trading volume,news and market efficiency: Evidence from the Jamaica Stock Exchange

This paper investigates market efficiency of the Jamaica Stock Exchange (JSE). Together, weak and semi-strong form efficiency claim that historical and newly released public information do not predict future stock price movement. We test both forms of market efficiency by analyzing stock price behavior during times of abnormal trading volume and around the release dates of earnings information. Abnormal trading volume may be driven by liquidity demand or reflect new or private information flow to the market. Using JSE data over the period 2000 to 2021, we find price dynamics consistent with price pressure as firms experience negative abnormal returns on the day of abnormal trading activity but offsetting positive abnormal stock returns on the following day. Further findings show post earnings announcement drift on the JSE. Taken as a whole, the evidence suggests violations of market efficiency and has implications for capital allocation in this emerging market.     

融资融券交易对市场和标的个股波动影响的研究

作为证券市场的重要制度之一,融资融券交易理论上应具有价格发现,价格稳定,提高流动性等基本功能。本文从融资、融券交易对市场和个股两个层面系统而全面的分析融资交易和融券交易的价格稳定作用。对市场波动性的影响的研究上主要借助GARCH族模型,VAR模型,脉冲响应和方差分解等计量分析方法;在对个股的影响上主要是借助面板数据分对个股的总体效应和个体效应展开分析。研究发现：融资交易对指数波动没有显著影响,融券交易对指数波动有一定平抑作用;融资融券交易对标的个股有价格稳定作用,除极个别个股的融资作用表现不确定。     

Institutional Investor Participation and Stock Market Anomalies

This paper investigates the impact of institutional trading volume on stock market anomalies. The paper proposes a measure that evaluates the percentage of total trading volume of a stock accounted for by institutional trades. The empirical analyses using a large sample of firms from 1980–2005 provide strong evidence that the strength of stock market anomalies such as price momentum, post‐earnings announcement drift, the value premium, and the investment anomaly is decreasing in institutional trading volume. Additionally, the effects of institutional trading volume are stronger than those of institutional ownership, the major measure of institutional investor participation in the finance literature. These findings suggest that institutional trading significantly improves stock price efficiency.