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This study examines share price reaction to the enrollment by companies in the Children’s Food and Beverage Advertising Initiative. We find that, on average, in the month of enrollment, shareholders of companies that join the CFBAI experience abnormal return of −3% and so do the shareholders of the immediate competitors that do not join the initiative. However, over the subsequent five years, while the shareholders of companies enrolled in the initiative experience an average abnormal return of +16.6%, that of non-enrolled competitors experience a further abnormal return of −34%. The abnormal returns for the two groups (at the time of enrollment and over the subsequent five years) are uncorrelated and so benefitting at the expense of competitors does not appear to be the motive for enrolling in the CFBAI. The study also provides comparison of number of employees and other important financial ratios before and after enrollment in the CFBAI for the two groups.

This study examines the information content of firms’ operations-related disclosures (ORDs) and the importance of these disclosures as an information source to stock markets relative to other commonly examined sources of information. I find that ORDs constitute a large portion of corporate press releases. These disclosures are associated with significant stock price reactions and trading volume. The stock price reactions to ORDs are greater than the reactions to 10-K/Q reports and are of similar magnitudes to the reactions to 8-K filings. On average, ORDs explain variation in firms’ quarterly returns to a similar degree as management earnings forecasts and 10-K/Q reports for the full sample and to a greater degree for small firms and firms with lower earnings quality.

Certification information published by a company will be responded by the market. Therefore, the purpose of this study is to examine the impact of ISO 9001 certification on the stock market reaction as indicated by stock returns reaction of companies in Indonesia.

This study used event study method with the period of 13 days. It consists of 6 days before and after ISO 9001 certification announcement and 1 day at the time of the event. It analyzed by using pair sample t-test and one sample t-test. The stock return data is obtained from companies that are ISO 9001 certified and it tested for their stock reactions before and after the certification.

The results of empirical research showed that the average and companies cumulative abnormal returns in Indonesia react quickly and positively on the first day after ISO 9001 certification announcement. This study proved the differences between abnormal returns before and after the ISO 9001 certification announcement period.

The company's success in implementing ISO 9001 will have an impact on investment in the capital market with a positive response from stock market players. The implication of this study is the further research can examine directly the impact of ISO 9001 implementation on investor behavior in the capital market.

Based on the development of the literature review, this is the first study which examined the impact of ISO 9001 certification announcement on investor reactions in the short term. Therefore, companies in Indonesia need to implement a quality management system for investors in Indonesia.

The purpose of this paper is to examine the effects of simultaneous and partial auditor switching toward the abnormal return of manufacturing companies listed in Indonesia Stock Exchange between 2009 and 2012.

Auditor switching is divided into some types: lateral Big 4 to Big 4 (B4B4), lateral non Big 4 to non Big 4 (NB4NB4), cross-up (CU) and cross-down. The abnormal return is measured with a market-adjusted model. In this study, company size is used as the control variable and is measured using the natural logarithm of the total assets (LnTA) and return on equity. Multiple linear regression is used for analysis with significant value a= 5 percent. The hypotheses were tested using f-test and t-test.

The result shows that simultaneous auditor switchings affect the abnormal return. In partial auditor switching, only CU switch has effects on the abnormal return.

This study provides additional literature on the effect of auditor switching, especially on an abnormal return.

We investigate the nature of mid-loan relationships between bank-lenders and borrowers, to test whether firms borrow from banks to signal quality. Using the LPC DealScan, CRSP, and Wall Street Journal databases, we test whether borrower abnormal returns are related to bank, borrower, deal, and/or event characteristics during the duration of the loan. We demonstrate that borrower abnormal returns are related to mid-loan bank events, defined as an event resulting in bank abnormal returns beyond a specified threshold. The results suggest that borrowers are affected by bank events mid-loan, even when the event is not directly related to bank default.

Several studies and research related to event study and terrorist bombing acts have different conclusions. Moreover, research on terrorist bombings worldwide has never been conducted. Hence, this research aims at examining the impact of terrorist bombing using the abnormal return variables by looking at all bombings around the world in the past 10 years. This research uses a paired t-test by looking at the abnormal return before, during, and after a bombing act. Results show no significant difference between the abnormal return before, during, and after bombing acts.

The purpose of this paper is to examine stocks that are most actively discussed by online posters and see if the messages posted about these stocks have information or if they are just noise.

This study uses messages posted on TheLion.com, which reports a real time list of the ten most actively discussed stocks. The stocks in this list at the daily market close during 2005‐2006 are examined. An event study is performed to estimate the daily abnormal returns on these stocks. Contemporaneous and lead–lag regressions of abnormal returns against message posting activities are performed.

Online posters prefer thinly traded micro‐cap stocks. On average, there is an abnormal return of 19.4 per cent on a stock the day it is one of the ten most talked about stocks. The number of messages posted about a stock on a given day is not only positively related with the stock's abnormal return on that day but it also positively predicts the next day's abnormal return.

It may be interesting to examine if the investor sentiment expressed in online messages has predictive power for micro‐cap stocks.

The results provide evidence to regulators that online talk affects stock prices. They show investors that there are inefficiencies in the stock market. They also suggest that corporate managers, especially of small firms, should monitor the stock message boards.

This study focuses on the micro‐cap stocks favored by online posters and finds that online talk has the power to predict the next‐day returns.

The purpose of this study is to analyze market inefficiencies in the market for cryptocurrencies by providing a comprehensive analysis of short-term (over)reactions that follow significant price changes of such currencies.

This study identifies and analyzes overreactions and mispricing in markets for cryptocurrencies by applying a broad set of thresholds that depend on market-specific dynamics and volatilities. This study also analyzes the returns on days following abnormal returns and identifies significant differences from normal returns using the t-test and the Mann–Whitney U-test. The researchers further complement the literature by using end-of-the-day returns in addition to high-low returns. Additionally, this study considers a broad sample of 50 cryptocurrencies for an expanded time span (2015–2020) that includes the big currencies as well as smaller currencies.

Findings detect the existence of overreactions and, thus, market inefficiencies in crypto markets. The findings for different methodological approaches are similar, which underpins the robustness of the findings. By considering a broad sample that includes small and big currencies, we can show the existence of a market size effect. By considering a broad set of thresholds, the authors further found evidence for a magnitude effect, which means that higher initial abnormal returns are related to higher inefficiencies.

This paper has practical implications. Market inefficiencies were detected, which can be used in practical trading to obtain excess returns. In fact, methodological approach of this study and its results can be used to derive a strategy for trading in cryptocurrencies that can be easily implemented. Based on the study’s findings, the authors can expect positive access returns by applying this trading strategy.

The authors complement the literature on market inefficiencies and mispricing in crypto markets by analyzing price patterns after initial abnormal returns. Researchers contribute by applying different methodological approaches in addition to the approaches used so far, by considering a set of different thresholds and by applying a much broader data set that enables the study to analyze additional aspects.

This paper aims to investigate the impact of the filing of Form 20-F to the Securities and Exchange Commission (SEC) on short-term trading volume and return by those foreign firms which list their securities in the US Stock Exchanges.

The authors collected 402 American depository receipt (ADR) firms from 38 different countries that listed their securities in the US Stock Exchanges over a 10-year period of 2000-2009. A regression model was used to examine such impact, including the post year 2007 SEC elimination of reconciliation.

This paper found significant abnormal trading volumes and abnormal returns one day, two days and three days following the 20-F report for the sample firms whose financial statements were prepared under both home-country accounting principles and US generally accepted accounting principles (GAAP). Firms originally using international financial reporting standards (IFRS) do not present abnormal return and abnormal trading volume. This indicates that US investors view IFRS to be as high-quality as US GAAP.

The findings might be limited to this period and might not draw statistical inference for the future period. This evidence offers support for the SEC’s elimination of the reconciliation requirement to US GAAP.

This study was carried out with the aim to investigate whether the release of Form 20-F by ADR firms offers any additional information useful to investors incorporating both abnormal return and trading volume, which is thought to be more sensitive.

This paper investigates the short-term return and volume reactions caused by the earnings and equity reconciliation from home-country accounting standards or IFRS to US GAAP for foreign cross-listed firms in the USA.

This study uses the unique setting of unusual market activity (UMA) replies to examine the market reaction and the effects of disclosure and investor protection amid information uncertainty.

A total of 1527 hand-collected UMA replies from the interlinked stock exchanges of Indonesia, Malaysia, Thailand and Singapore for the period of 2015–2017 were analysed using event study and Heckman two-step methods with market and matched control firm benchmarks.

The overall results support the uncertain information hypothesis. The UMA replies with new information were also found to reduce information uncertainty, but not information asymmetry, and they are complementary to investor protection in enhancing abnormal returns. The overall finding suggests that the UMA public query system can be an effective market intervention mechanism in improving information certainty and efficiency.

This study provides insight on the effects of news replies and investor protection on abnormal returns, and support for the uncertain information hypothesis. The finding is useful to policymakers and stock exchanges as they seek to understand how to alleviate investors' anxiety and to create an informationally efficient market. Nevertheless, this study is limited by the extensiveness of the hand-collected UMA replies and also the potential issue of simultaneity-induced endogeneity.

This study uses UMA replies and cross-country data taking into account the effects of market surroundings such as information uncertainty and the level of investor protection on market reaction.