Short-Selling Activities in the Time of COVID-19

This study examines the daily short-selling activities in the U.S. market during the early 2020 outbreak of the COVID-19 global pandemic. Our findings indicate firms that are more sensitive to the shock (i.e., with high foreign exposure, low financial or operating flexibility, or high supply-chain exposure) were shorted more heavily. Moreover, short-selling activities during the COVID-19 pandemic, blamed for triggering stock market crashes, were primarily concentrated around overpriced stocks. This finding supports the argument that short selling plays a prominent role in improving price discoveries. Our research provides timely empirical evidence supporting the U.S. Securities and Exchange Commission's (SEC) non-intervention approach in banning short selling in the U.S. market.

TIME-VARYING EFFECT OF SHORT SELLING ON MARKET VOLATILITY DURING CRISIS: EVIDENCE FROM COVID-19 AND WAR IN UKRAINE

In this paper, we empirically investigate the effect of short selling on market volatility during exogenously-induced uncertainties. Using the Covid-19 pandemic and the onset of the Russian-Ukraine Conflicts periods as event study, we employ the asymmetric EGARCH model. We show high persistence and asymmetric effects of market volatility during the pre-covid outbreak and post-covid outbreak periods. We find evidence that short selling increases market volatility during the pre-covid outbreak period while the period of the Russian-Ukraine conflict is characterized by reduced volatility. We find no evidence of short selling effect on market volatility during the post-covid outbreak period. Our findings provide significant implications for short-selling strategies during crisis periods. © 2022 The authors.

On the importance of fiscal space:evidence from short sellers during the COVID-19 pandemic.

Using the exogenous shock of the COVID-19 pandemic, we study how informed market participants incorporate fiscal space into their trading decisions. At the onset of the pandemic, short-selling activity shifted towards companies with low financial flexibility but only in countries with limited fiscal space. Among such companies, short sellers specifically targeted those that generate their revenues mainly in the domestic market. These short sellers entered their positions before the market crash, thereby generating significant abnormal returns. We find no evidence of either herding behavior prior to the market crash or a long-run performance reversal of short sellers. These findings support the notion that short sellers help to promote price efficiency in times of crisis, where governments with budgetary constraints are unable to provide sufficient stimuli to their economies.

High short interest stocks performance during the Covid-19 crisis: an informational efficacy measure based on permutation-entropy approach

Purpose: The author examine the performance of a number of high short interest stocks along with the prices of the GameStop stock and three major stock exchange indices, particularly for the period after the eruption of the Covid-19 crisis. Design/methodology/approach: With the employment of the complexity–entropy causality plane approach, the author categorize the stock prices in terms of the level of informational efficiency. Findings: The author reported that the efficiency level for the index of the high short interest stocks falls considerably, not only at the onset of the Covid-19 crisis but during the health crisis period at hand. This is translated into proof of less uncertainty in predicting the stock prices of these specific stocks. On the other hand, the GameStop prices exhibit the same behavior as those with the high short interest firms, but change considerably in the middle of the crisis. The reversal of the behavior, by obtaining higher informational efficiency levels, is attributed to the short squeeze frenzy that increased the price of the stock many times over. Among the stock market indices, the Dow Jones Industrial Average and the S&P 500 decreased their efficiency levels marginally, after the surge of the crisis, while the Russell 2000 index kept the level intact. The high and stable degree of randomness could be attributed to the measures taken concurrently by the Federal Reserve and the government immediately after the outbreak of the crisis. Originality/value: This is one of the few studies that examine the impact of short selling behavior on the efficiency level of certain stocks' prices, particularly during the health public crisis. It provides an alternative approach to measuring quantitatively the degree of inefficiency and randomness. © 2023, Emerald Publishing Limited.

Firm-level short selling and the local COVID-19 pandemic: Evidence from China.

Short seller trading behavior attracts much attention, especially when negative shocks occur. Recent literature has focused on the impact of the COVID-19 pandemic, an unprecedented shock, but evidence on short sellers' reactions is quite scarce. This paper investigates how short sellers responded to the local COVID-19 pandemic in China. Empirical results show that greater numbers of newly confirmed COVID-19 cases in listed firms' headquarters locations are associated with more subsequent short selling of those firms. The results hold after addressing other potential concerns. In addition, the impact of the local COVID-19 pandemic on short selling is stronger for firms with weaker financial conditions, in more vulnerable industries, and with higher risks of a stock price crash. The impact is alleviated after lifting the lockdown restrictions in Wuhan and becomes insignificant in later outbreaks. Overall, our findings support the informational role of short sellers within the context of the COVID-19 pandemic.

Short-Selling Restrictions and Financial Stability in Europe: Evidence from the Covid-19 Crisis

In March 2020, six European countries imposed temporary short-selling bans to prevent further stock price declines, to reduce volatility, and to ensure financial stability during the Covid-19 pandemic, whereas other countries abstained from implementing these restrictions. We examine the effects of these regulatory interventions on stock returns and market quality for major European countries with and without bans. Our results reveal that restricting short selling did not stabilize stock prices but adversely affected market liquidity, as reflected in wider bid-ask spreads and lower turnover. In addition, smaller stock markets and smaller firms suffered more from the deterioration in market quality. Using logit regressions, we investigate the determinants for the probability that a country would impose short-selling restrictions. The results suggest that countries with weaker economies, lower fiscal capacity, less financial development, and stricter lockdown measures were more likely to adopt a ban. Overall, short-selling bans during the Covid-19 crisis negatively affected market quality and consequently regulators in general should abstain from implementing such restrictions in the future.

Optimal Time-Consistent Investment and Premium Control Strategies for Insurers with Constraint under the Heston Model

In this work, we study the optimal investment and premium control problem with the short-selling constraint under the mean-variance criterion. The claim process is assumed to follow the non-homogeneous compound Poisson process. The insurer invests the surplus in one risk-free asset and one risky asset described by the Heston model. Under these, we consider an optimization objective that maximizes the return (the expectation of terminal wealth) and minimizes the risk (the variance of terminal wealth). By constructing the extended Hamilton–Jacobi–Bellman (HJB) system with the dynamic programming method, the time-consistent strategies and the corresponding value function are obtained. Furthermore, we provide numerical examples to illustrate the effects of the model parameters on the optimal policies.

Effect of KRX Designated Market Maker on Liquidity

The transformation of order-driven markets into a hybrid market by introducing market makers reflects the global trend to increase market quality factors, such as liquidity. This study evaluates how market makers influence liquidity, using the data on market maker-designated stocks collected in 2020. The analysis of the effectiveness of the market maker and significance of individual stock-level liquidity shows that the effect of newly designated stocks is higher than that of undesignated stocks. The study finds that the effect of increasing the stock liquidity of consecutively designated market makers is lower than that of the newly designated market makers;in particular, the effect of increased liquidity dominated the effect of the entire sample period during which short selling was banned. These empirical findings are interpreted as the effect of funds inflow, which occurred due to the monetary policies adopted and prohibition of short selling by financial authorities during the coronavirus disease 2019 pandemic, combined with the liquidity provision of market makers. Overall, we compare the level of liquidity in the stocks designated by market makers to highly liquid stocks;the market maker’s role is assessed to have an effect on liquidity. © 2022, Korean Securities Association. All rights reserved.

The COVID-19 pandemic, short-sale ban, and market efficiency: empirical evidence from the European equity markets

This study looks at the inefficiency of stock indices of France, Italy, and Spain around their financial regulatory authorities' short-sale ban during the COVID-19 pandemic crisis. The empirical analysis of this study provides evidence of price predictability of the basis of futures contract prior to the short-sale restriction. Moreover, the results show a significant underpricing in futures contracts of FTSE MIB and IBEX35 indices while the two months of short-sale banned period. These findings suggest that prohibiting short selling during the market downturn might undermine the stock markets' efficiency and generate arbitrage opportunities for speculative investors.

Long term optimal investment with regime switching: inflation, information and short sales.

Financial models are based on the standard assumptions of frictionless markets, complete information, no transaction costs and no taxes and borrowing and short selling without restrictions. Short-selling bans around the world after the global financial crisis and in several exchanges during the COVID 19 period, become more and more important. This paper bridges the gap by providing for the first time in the literature a model that accounting explicitly and simultaneously for inflation, information costs and short sales in the portfolio performance with regime switching. Our model can be used by portfolio managers to assess the impact of these market imperfections on portfolio decisions.