机构投资者持股与股价同步性分析

本文利用中国证券市场所有A股上市公司2005～2007年的面板数据,对股价同步性和代表机构投资者持股的三个变量——机构投资者持股比例、机构投资者持股变化和持股机构投资者数量进行回归统计,检验了机构投资者持股对股价同步性的影响。研究表明,代表机构投资者持股的三个变量都与股票股价同步性显著负相关,其中机构投资者持股变化是影响股价同步性的决定性因素,其他两个变量都是通过该变量发生作用的。这一结果说明机构投资者利用公司特质信息进行的基于信息的交易提高了股价中的信息含量,降低了股价同步性。     

社交媒体、公司传闻与股价冲击——来自东方财富股吧论坛的经验证据北大核心

社交媒体是把双刃剑,在提高资本市场信息效率的同时也可能加速虚假信息传播和扩散,加剧股票价格震荡。基于东方财富股吧论坛数据,本文研究社交媒体在公司传闻传播过程的作用。研究发现,股吧论坛中的投资者互动会加剧公司传闻对股价的冲击。对于信息不对称较高、机构持股比例较低的公司,股吧互动加剧公司传闻对股价的冲击作用更强;2013年互联网信息环境整治后,股吧互动引发的负面效应得以削弱;此外,当公司传闻的澄清速度偏慢、或“传闻”并非虚假信息时,股吧互动加剧公司传闻对股价冲击的效应更强。进一步地,股吧互动引起了投资者对公司传闻更高的关注,表现为投资者针对传闻公司的股票交易量显著增加;同时股吧互动放大了公司传闻对投资者情绪的影响,进一步加剧了传闻对股价的冲击。本文研究表明,社交媒体上的投资者互动可能加速公司传闻的传播,放大投资者情绪,不利于资本市场的稳定发展。     

机构投资者降低了股价崩盘风险吗?

本文以2003-2013年中国A股上市公司为样本,考察了机构投资者持股比例与股价崩盘风险之间的关系。研究发现,机构投资者持股显著增大了公司股价未来崩盘的风险。在考虑了机构投资者异质性和内生性等因素的影响后,该结论依然成立。进一步研究发现,在信息不对称程度较高的公司中,机构投资者持股比例与股价崩盘风险之间的正相关关系更强;公司所在地区的制度环境越完善,上述正相关关系越弱。渠道分析表明,机构投资者对股价崩盘风险的正向影响一定程度上源于它加剧了信息不对称。本文拓展了股价崩盘风险影响因素研究,丰富了机构投资者持股经济后果的相关文献,对监管部门积极引导机构投资者、维护资本市场平稳健康发展,具有一定的启示意义。     

机构投资者、所有权性质与权益资本成本

本文考察机构投资者与所有权性质如何影响公司的资本成本。我们发现,第一,机构投资者参与显著降低了公司的资本成本,且长期投资者发挥的作用更为明显;第二,相对于民营企业而言,机构投资者的作用在国有企业中更为明显;第三,机构投资者降低企业权益资本成本的作用机制主要体现在公司治理与信息解读两个方面,并在不同产权性质企业中存在一定差异。总体而言,机构投资者能够通过监督公司的治理行为以及提高公司的信息披露降低公司的资本成本。本文为机构投资者在我国资本市场上所扮演的角色提供了新的证据,同时建议监管部门应注重管理机构投资者参股交易行为中的规范性。     

ESG信息披露能够改善资本市场定价效率吗？

ESG信息披露是上市公司与投资者沟通的重要方式,分析其是否能改善资本市场定价效率,对新时期助力市场资源配置功能发挥,增强金融服务实体经济能力具有重要意义。考虑到股价同步性是衡量资本市场定价效率的有效指标,本文以2016－2020年中国A股上市公司为样本,分析ESG信息披露对资本市场定价效率的影响及其作用渠道。研究发现：（1）中国当前股票市场信息环境整体表现为噪声环境,即随公司基本面信息的增加,代表资本市场定价效率的股价同步性将上升;（2）在噪声环境中,ESG信息披露可以揭示公司基本面信息,反映公司内在价值,进而改善资本市场定价效率;（3）ESG信息披露可以通过减少投资者噪声交易行为、缓解市场信息不对称程度,继而改善市场定价效率。本研究为完善信息披露制度、优化资本市场信息环境、提升市场定价效率提供了决策参考。     

交叉上市提高了我国A股市场股价信息含量了吗?

利用2010—2019年我国A股上市公司数据,实证检验了交叉上市对我国资本市场股价信息含量的影响.研究发现,交叉上市有利于提高我国资本市场股价信息含量,降低股价同步性,该结论在采用Heckman两阶段回归模型以及相关稳健性测试后仍然成立.截面异质性检验发现,交叉上市对股价信息含量的影响在国有企业、会计信息质量较低、有研报关注的上市公司中更为显著.机制检验发现,交叉上市通过提高资本市场股票流动性、投资者关注度进而提高了股价信息含量.研究结论丰富了交叉上市的经济后果,为促进我国资本市场健康发展提供经验借鉴.     

基于机构投资者视角股价同步性现象研究

本文以2008到2010年深证A股主板404家公司985个面板数据为研究样本,从信息经济学和行为金融学视角分析了"套利交易"和"噪音交易"活动对股价同步性的影响机制,并以此来探讨机构投资者的证券投资行为对股价同步性的影响。实证结果表明:机构投资者基于价值投资的长期持股行为能够显著地提高个股价格的信息含量,从而降低股价同步性;反之,机构投资者基于噪音交易的短期投机行为反映的是与公司基本面无关的价格波动,会加剧证券市场的股价同步性。     

基于机构投资者视角股价同步性现象研究

本文以2008到2010年深证A股主板404家公司985个面板数据为研究样本,从信息经济学和行为金融学视角分析了"套利交易"和"噪音交易"活动对股价同步性的影响机制,并以此来探讨机构投资者的证券投资行为对股价同步性的影响。实证结果表明:机构投资者基于价值投资的长期持股行为能够显著地提高个股价格的信息含量,从而降低股价同步性;反之,机构投资者基于噪音交易的短期投机行为反映的是与公司基本面无关的价格波动,会加剧证券市场的股价同步性。     

机构投资者实地调研能否缓解股价同步性——基于我国A股上市公司的经验证据

本文以2014-2018年我国深圳A股上市公司为样本,实证检验了机构投资者实地调研与股价同步性的关系,并探究了信息披露质量和机构投资者持股比例对此关系的调节作用.研究结果表明,机构投资者实地调研提升了公司的特质信息含量,显著降低了股价同步性.进一步研究发现,机构投资者实地调研对股价同步性的降低作用在信息披露质量较好的公司和机构持股比例较大的公司更为显著.本文的研究不仅拓展了现有关于机构投资者信息中介作用的研究,丰富了关于股价同步性影响因素方面的相关文献,并为监管部门完善上市公司信息披露制度、引导投资者与上市公司深入交流,提供了有益启示.     

机构调研影响股价崩盘风险吗?

机构调研在降低股价崩盘风险、稳定市场中能否发挥作用,是一个值得探讨的问题.本文选取2014—2019年沪深A股上市公司为研究样本,考察机构调研对被调研公司股价崩盘风险的影响.实证研究发现:机构调研的次数越多、参与调研的机构家数越多,被调研公司的股价崩盘风险越小,表明机构调研能够降低股价崩盘风险.进一步的中介效应检验表明,机构调研能够提高被调研公司的信息透明度,从而降低股价崩盘风险.本文拓展了机构调研经济后果的研究范围,在我国资本市场注册制改革背景下,对发挥机构投资者作用、稳定股价和促进资本市场健康有序发展具有一定的理论与现实意义.     

Market ambiguity and individual investor information demand

We examine whether ambiguity in the market leads to an increase in information demand by individual investors. Drawing on the asset-pricing model proposed by Mele and Sangiorgi (2015), which incorporates market ambiguity, we measure individual information demand using daily Google searches and measure market ambiguity using a metric based on the market trades of institutional investors. We find that individual investors increase their information demand during periods of greater market ambiguity. We also provide evidence that information demand from individual investors spikes around earnings announcement days primarily when market uncertainty is driven by net-selling activity. Overall, these results suggest that the disagreement among institutional investors either represents uncertainty or contributes to the uncertainty related to a stock, leading to increased demand for information from individual investors.     

Futures Market Sentiment and Institutional Investor Behavior in the Spot Market: The Emerging Market in Taiwan

This paper investigates whether and how futures market sentiment and stock market returns heterogeneously affect the trading activities of institutional investors in the spot market in Taiwan. Our empirical results suggest that foreign investors are net sellers whenever futures market sentiment is bullish and net buyers when investor sentiment is bearish. The two types of domestic institutional investors have poor sentiment timing abilities and the price-pressure effect may account for the behavioral differences among institutional investors. In addition, all three institutional investors are momentum traders. Nevertheless, the momentum trading of foreigners is consistent with an information-based model and that of two local institutional investors, as behavior-based models suggest. This indicates that the same trading momentum strategy can lead to different outcomes for different investors, and both information- and behavior-based momentum trading can exist contemporaneously in the Taiwanese stock market.     

Daily Stock Trading by Investor Type and Information Asymmetry: Evidence from the Korean Market

We examine the influence of trading by heterogeneous investors on information asymmetry in the Korean stock market, which includes domestic and foreign institutional investors and individual investors. In particular, we examine the relationship between the daily trading volume and the level of information asymmetry reflected in the stock price. The results reveal that high-volume daily trading by domestic institutional and individual investors increases the degree of information asymmetry in the short term, but is more evident for individual investors. Foreign institutional investors tend to mitigate the information asymmetry. Finally, our findings are robust to an alternative measure of investor trading.     

Market Segmentation and Cross‐predictability of Returns

We present evidence supporting the hypothesis that due to investor specialization and market segmentation, value‐relevant information diffuses gradually in financial markets. Using the stock market as our setting, we find that (i) stocks that are in economically related supplier and customer industries cross‐predict each other's returns, (ii) the magnitude of return cross‐predictability declines with the number of informed investors in the market as proxied by the level of analyst coverage and institutional ownership, and (iii) changes in the stock holdings of institutional investors mirror the model trading behavior of informed investors.     

机构投资者与资本市场波动

本文对机构投资者如何引起和加剧金融市场波动的原因进行了分析,这些原因既有机构投资者自身的投资行为方面的,也有委托-代理问题所引起的,还有由投资者推动的,以及由监管和制度设计方面的缺陷所造成的问题。本文还对国际机构投资者投资新兴市场所引起的金融动荡进行了分析,并对如何引导机构投资者向有利于金融市场稳定的方向发展提出了建议。     

Market liberalization within a country

China's B-share market, which used to be restricted to foreign investors, was partially opened up in February 2001 to Chinese local investors. We take this as a controlled experiment in cross-border trading on a small scale. We find mild but positive effects on the B-share market, with higher volumes, lower levels of volatility, lower bid–ask spreads and more liquidity after liberalization. Between A- and B-shares, price disparities narrowed; the correlation and the co-integration relationships became stronger; and the flow of information became more balanced. More new individual investors entered into the B-share market without crowding out existing institutional investors. Even though the liberalization measure is partial and one-way, it has helped to improve the quality of the B-share market, and our results lend no support to the popular claim that liberalization does nothing but help the existing foreign shareholders to cash out.     

机构投资者与上市公司年报披露及时性的实证研究

我们运用Logit模型检验机构投资者持股量与上市公司年报披露时间差异之间的关系时发现,机构投资者促进了上市公司年报的及时披露。但是,机构投资者在促进上市公司年报及时披露的程度与整个证券市场环境相关。在证券市场整体牛市时,机构投资者似乎对上市公司年报披露是否提前并不产生影响,但是当股票市场整体处于熊市时,机构投资者对会计信息的需求愿望比较强烈,机构投资者持股量与上市公司提前披露年报显著正相关。这说明了机构投资者只是会计信息的外部使用者之一,机构投资者促进了上市公司年报及时披露,机构投资者没有降低信息披露的质量。     

The Sensitivity of Individual and Institutional Investors' Expectations to Changing Market Conditions: Evidence from Closed-End Funds

This study investigates whether individual and institutional investors respond differently to changes in market conditions. Closed-end funds are the medium used to test the hypothesis because closed-end fund shares (held primarily by individual investors) and the underlying assets (held primarily by institutional investors) are claims to the same stream of distributions. The empirical results suggest that individual investors are more responsive than institutional investors to changes in market conditions. Moreover, although the response of institutional investors differs across stock and bond markets, we cannot reject the hypothesis that the additional sensitivity of individual investors' expectations is uniform across stock and bond markets.     

US and Domestic Market Gains and Asian Investors’ Overconfident Trading Behavior

We find that subsequent to both US and domestic market gains, both Asian individual and institutional investors increase their trading and that this effect is more pronounced in bull markets, in periods of relatively favorable investor sentiment, in periods of extremely high market returns, and in markets with short‐sale constraints. We also find that individual investors trade more in response to market gains than institutional investors. Moreover, we find that further integration of Asian stock markets with US stock markets after the Asian financial crisis in 1998 is an important reason for Asian investors’ response to US market gains.     

机构投资者影响我国股价波动的实证研究

采用 TGARCH 模型对机构投资者与我国股指波动的关系进行研究,实证结果表明：无论是否考虑宏观经济因素对股票市场的影响,机构投资者对我国股票市场波动均产生正向影响。进一步用面板数据模型对机构投资者与上市公司股价波动的关系进行研究,发现机构投资者在不同宏观经济环境下也均未起到稳定上市公司股价波动的作用。