ETF持股如何影响股票流动性？

本文基于2012-2021年沪深两市上市公司和股票型ETF数据，运用固定效应模型，探究ETF持股对股票流动性的影响机制。研究发现：（1）A股市场上，ETF持股比例增加对股票流动性有显著提升作用；（2）ETF的日内套利活动特别是日内折价套利活动，能够提升股票流动性；（3）ETF持股比例提高，能够提升成分股的投资者情绪，进而改善股票流动性。     

人力资本对股票收益的预测研究

迄今国内研究尚未系统剖析人力资本在资本市场中的价值，本文基于中国A股市场考察人力资本对股票市场的影响。通过回归和投资组合分析证实存在人力资本溢价，即人力资本水平越高的企业股票收益率越高，人力资本是影响股票收益的风险因子。从“风险传播”“价值增长”和“信息传递”三条渠道剖析人力资本溢价内在驱动机制，丰富了人力资本溢价理论解释机制。异质性分析发现：相比于非国有企业，国有企业中人力资本溢价更显著；融资约束和披露职工信息在人力资本溢价中发挥“促进作用”;经济政策不确定性在人力资本溢价中发挥“抑制作用”;劳动力市场规模越大越容易削弱人力资本对股票收益的影响。本文为投资者投资决策提供了新视角，为企业、国家重视人力资本贡献了股票市场诠释。     

内地公司在香港、美国双重上市的股价信息传递

内地公司在美国上市的股票价格调整幅度比美国大盘的调整幅度要小，而在香港上市的股票价格调整幅度与恒生指数接近或者超过香港大盘的调整幅度；价格信息只由美国传递到香港，美国市场前一天的收盘价对第二天香港市场的开盘价有显著正影响；香港市场的股价变化对美国市场的股价没有影响。     

中国股市股票交易信息与股票横截面收益研究

本文基于沪深股市1993-2008年剔除了金融类股的所有A股数据,研究了股票动量因素、反转因素和换手率等股票交易信息对股票收益横截面的影响。研究结果表明,股票的一年期的动量因素对股票的横截面收益的影响不显著,股票的三个月的短期反转因素对股票的横截面收益有显著影响,股票的三个月的累计收益越低,其在接下来一期获得的收益就可能越高。股票的换手率对股票的横截面收益的影响也显著,股票的上一期的换手率越高,在接下来的一期获得的收益就可能越低。     

分割资本市场下的会计信息价值研究

本文采用事件研究和面板数据回归方法对我国A股～H股双重上市公司境内外报表披露的会计盈余和帐面净值与股票超额收益的相关性进行了研究。分析表明,在A股市场上,境内报表披露的会计盈余等信息与A股超额收益之间没有显著的价值相关性;境内外报表关于会计盈余和账面净值的调整值对A股价格也没有影响;在H股市场,会计信息与股价之间的相关性较强,不仅境外报表披露的主要会计指标能够有效解释年报披露期间H股超额收益,而且境内外报表的会计盈余和账面净值调整值还具有增量信息价值。由此我们认为中国内地资本市场与香港资本市场的分割效应较为明显。     

上市公司自愿性信息披露对股票流动性影响的实证研究

以2007～2008年沪深两市A股上市公司年报作为研究基础,运用描述性统计和两阶最小二乘法分析了自愿性信息披露对上市公司股票流动性的影响。验证了自愿性信息披露会促进上市公司股票的流动性,同时发现自愿性披露信息中财务方面信息对上市公司股票流动性的提高作用最大。     

企业数字化转型与资本市场定价效率——来自股票定价偏误的经验证据

基于中国沪深A股上市公司2013～2020年数据，实证检验了企业数字化转型对股票定价偏误的影响及其机理。研究发现：企业数字化转型显著降低了股票定价偏误程度；机制分析表明，企业数字化转型程度的提高，主要是通过外部治理机制发挥信息效应和内部治理机制弱化企业代理问题来降低股票定价偏误程度；异质性分析表明，企业数字化转型效力的发挥在非国有企业以及地区信息化水平较高的企业中更为明显。研究及结论为上市公司提高资本市场定价效率提供了经验证据。     

赢富数据信息披露对股票收益的影响

本文基于赢富数据所披露的交易信息数据,将样本区间分为六个时间段,比较各个阶段投资者通过利用赢富数据买卖集中度获得收益的能力,来研究股票市场信息环境变化对股票收益的影响.实证结果表明,当股票买入集中度较大时,在初始的五个阶段,市场信息不对称程度的下降降低了股票的信息风险,导致股票收益下降;而在第六个阶段,期望信息风险的增加导致股票的收益较前一阶段有较大提高.而当股票具有较高的卖出集中度时,随着市场信息披露程度的提高,市场对利空信息反映更加敏感.     

A股上市银行股票的内在价值与估值偏离分析

本文基于资本市场普遍采用的三阶段股利贴现模型,以三家A股代表性上市银行为样本,以较为谨慎的盈利增速,模拟测算了其内在价值,并与市场公开模型进行了结果印证。研究表明,A股上市银行股票的市场价格长期低于其内在价值区间,从模型参数角度分析,这种估值偏离的主要影响因素是实际折现率溢价、长期增长信心折价、非对称信息折价、短期投资考核机制等。本文认为,未来A股上市银行股价上涨的主要驱动力将会来自于自身估值回归,那些经营基本面良好、投资者关系公开透明的银行的股票或存在较大的估值回归动能。     

投资者关注度对股票收益的影响——基于百度指数的研究

本文基于百度指数,以2012年4月至2013年3月的沪市A股日数据为研究样本,采用组合分析法和面板回归分析法,研究投资者关注度对股票收益的影响。研究结果显示:关注度与同时期股票收益成正比,且关注度高的股票收益明显大于关注度低的股票;关注度在当期对市场造成的正向价格压力将很快发生反转,且关注度的反转效应比较稳定,不会因为时间的改变或大环境的变化而发生变化。     

香港股市与内地股市的联动性研究

本文分3个阶段考察了香港回归以来,香港股市和内地股市之间的联动关系及其变化。协整分析表明,香港股市和内地股市之间存在长期的均衡关系,这种均衡关系在内地资本市场实行股权分置改革后更趋于稳定。Granger因果检验表明,香港回归以来香港股市和内地股市之间的引导关系在经历B股开放和股权分置改革后发生了变化。脉冲响应函数分析从动态的角度进一步验证了香港股市和内地股市之间的引导关系及其变化,并深入分析了单个变量的波动或冲击对其自身及另一变量的影响程度。     

Do stock bulletin board systems (BBS) contain useful information? A viewpoint of interaction between BBS quality and predicting ability

This study explores whether information on internet stock bulletin board systems (BBS) is valuable for stock return prediction, taking advantage of data derived from the biggest stock BBS in China. Using a text classification algorithm, we find the online messages significantly predict stock return with negligible R‐squared. However, we find that accuracy of individual BBS posts is below 50 percent and there is no distinction at prediction accuracy between high‐ and low‐quality stock BBS. Due to the autocorrelation of stock returns, we argue that BBS predicts stock returns because of its reflection on the simultaneous stock return rather than revelation on valuable information.     

Failed takeovers, methods of payment, and bidder returns

This study documents bidding-firm stock returns upon the announcement of takeover terminations. On average, bidding firms that offer common stock experience a positive abnormal return, and firms that offer cash experience a negative abnormal return. The positive performance is primarily driven by bidders initiating the takeover termination. Commonstock-financed bidders earn a return not significantly different from that earned by cashfinanced bidders when terminations are initiated by the target firm. The results are consistent with the asymmetric information hypothesis, that the decision not to issue common stock conveys favorable information to the market. In addition, bidder returns at takeover termination are positively related to the amount of undistributed cash flow, supporting the free cash flow hypothesis.     

Stock Prices and the Secondary Dissemination of Information: The Wall Street Journal's "Insider Trading Spotlight"Column

In this paper we test whether a secondary dissemination of information affects stock prices. We examine stock price reactions to the publication of the “Insider Trading Spotlight”(ITS) column in the Wall Street Journal (WSJ). Since insider trades reported in the ITS column are initially disclosed to the public when insiders’ reports are filed with the Securities and Exchange Commission (SEC), the information contained in the WSJ is a secondary dissemination. Around the WSJ publication day, we find significant abnormal stock performance accompanied by a significant increase in trading volume. Our evidence suggests that a secondary dissemination of information can affect stock prices if the initial public disclosure attracts only limited attention by the market. In addition, we document how insider trading information is conveyed to the market.     

The Media and the Diffusion of Information in Financial Markets: Evidence from Newspaper Strikes

The media are increasingly recognized as key players in financial markets. I investigate their causal impact on trading and price formation by examining national newspaper strikes in several countries. Trading volume falls 12% on strike days. The dispersion of stock returns and their intraday volatility are reduced by 7%, while aggregate returns are unaffected. Moreover, analysis of return predictability indicates that newspapers propagate news from the previous day. These findings demonstrate that the media contribute to the efficiency of the stock market by improving the dissemination of information among investors and its incorporation into stock prices.     

Individual investors’ information use,subjective expectations,and portfolio risk and return

What information do individual investors use when making their financial decisions and how is it related to their stock market expectations, their confidence in these expectations, and the risk and return of their stock portfolios? I study these questions by combining survey data on the information usage among individual investors in Sweden with detailed registry data on their stock portfolios. I find that investors use filtered financial information (e.g. information packaged by a professional intermediary) more frequently than they use unfiltered financial information (e.g. information from annual reports and financial statements). Investors who frequently use filtered financial information are, however, more confident in their stock market expectations and take larger risks in their stock portfolios. Investors that instead use unfiltered financial information take lower portfolio risks and obtain higher portfolio returns. The findings in this paper thus suggest that investors can improve their financial decisions by using more unfiltered financial information rather than filtered financial information when they make their financial decisions.     

不同收益水平上盈余信息与股利政策的交互关系研究

以沪深上市公司为样本,检验盈余信息和股利政策在不同收益上的解释作用,并深入研究盈余信息分别与现金股利、股票股利和多种分配方案等三个层面的股利政策的交互关系。结果表明:在大多数收益水平上,盈余信息和股利政策显著影响市场收益水平,而且二者之间存在显著的交互关系。具体而言,现金股利变化与盈余变化在不同收益水平上具有不同的交互影响;而股票股利与盈余信息的交互影响在各收益水平上均不十分突出;多种分配方案中的"综合政策"与盈余变动在各收益水平上表现出较大的正向交互影响。     

Messages in online stock forums and stock price synchronicity: Evidence from China

Online stock forums allow investors to share information and exchange opinions, which facilitates the incorporation of firm-specific information into prices and reduces stock price synchronicity. However, prior research presents mixed evidence as to the value of messages in online forums. Using the information of the Eastmoney Guba online forum in China, we find a causal and negative relation between Guba messages and stock price synchronicity. The finding is robust after accounting for media reports and firm fixed effects and using both an instrumental variable analysis and an experimental design that exploits exogenous changes in the authenticity of Guba messages. We find the impact of Guba information is attributed to its roles in both information dissemination and investor interaction and is more pronounced for messages with a negative narrative tone. Additional tests suggest Guba messages improve firm information disclosure quality, reduce stock price crash risk and decrease stock return volatility synchronicity.     

Credit derivatives and stock return synchronicity

The role of credit default swaps (CDS) in the 2008 financial crisis has been widely debated among regulators, investors, and researchers. While CDS were blamed for destabilizing the financial system, they remain effective tools for hedging credit risk, especially for major banks, and produce positive informational externalities to market participants. This paper examines whether the introduction of CDS enhances the amount of firm-specific information impounded in stock prices. We use stock return synchronicity to measure the amount of firm-specific information reflected in stock prices, with more firm-specific information being associated with a lower level of synchronicity. We find that a firm’s stock return synchronicity decreases after the commencement of CDS trading. This finding is robust to different model specifications, synchronicity measures, and endogeneity controlling methodologies. Furthermore, the decrease in stock return synchronicity is more pronounced for CDS firms with higher credit risk. Overall, our evidence supports the positive role of CDS in improving informativeness of stock prices.     

Corporate Sales, Predisclosure Information and Return Variability

This paper investigates the determinants of return variability between accounting report and non-report periods. A model of information dissemination in financial markets is developed which shows that if corporate sales activity is a source of predisclosure information, the ratio of return variability between accounting report and non-report periods decreases in contribution margin per dollar sales. Greater contribution margin increases that portion of cash flow variability which is predictable by investors' observation of sales activity and, therefore, contribution margin indexes the informativeness of sales-related predisclosure information. Greater informativeness increases return variability in the predisclosure period relative to the accounting report period. Supporting evidence for this prediction is presented.