Bakgrund: De kinesiska aktiemarknaderna har tidigare omskrivits för att vara volatila. Samtidigt har börserna i framför allt Fastlandskina varit svårtillgängliga för utländska investerare. Under 2014 lanserades Stock Connect, ett system som underlättade för utländska institutioner att handla aktier på börserna i Fastlandskina. Studien vill därför undersöka sambandet mellan volatilitet och grad av utländskt ägande samt vilken påverkan Stock Connect haft. Syfte: Syftet med studien är att analysera sambandet mellan grad av utländskt ägande och volatilitet på börserna i Fastlandskina samt inverkan av Stock Connect. Metod: Studien tillämpar en kvantitativ metod med en deduktiv ansats. Med hjälp av tidsseriedata över historisk volatilitet och grad av utländskt ägande över perioden 2006–2023 genomförs regressioner samt Chow- och t-test för att analysera samband. Vidare testas för ytterligare variabler som med stöd i litteratur och tidigare forskning kan påverka volatiliteten så som ränta, inflation, konsumentförtroende och politiskt styre. Resultat: Studiens resultat visar på att det finns ett signifikant samband mellan volatilitet och grad av utländskt ägande i Fastlandskina, där en ökad grad av utländskt ägande medför en minskad volatilitet. Studien finner även att Stock Connect har haft en signifikant påverkan på volatiliteten och det utländska ägandet, där det utländska ägandet är högre efter Stock Connect samtidigt som volatiliteten är signifikant lägre. / Background: The Chinese stock markets have previously been described as volatile. At the same time, the stock exchanges in mainland China in particular have been difficult to access by foreign investors. In 2014, Stock Connect was launched, a system that made it easier for foreign institutions to trade shares on the stock exchanges in mainland China. The study therefore wants to examine the relationship between volatility and degree of foreign ownership and what impact Stock Connect had. Purpose: The purpose of the study is to analyze the relationship between degree of foreign ownership and volatility on the stock exchanges in mainland China and the impact of Stock Connect. Methodology: The study applies a quantitative method with a deductive approach. Using time series data on historical volatility and degree of foreign ownership over the period 2006–2023, regressions, Chow test and t-tests are performed to analyze relationships. Furthermore, additional variables are tested that, with support in literature and previous research, can affect volatility such as interest rate, inflation, consumer confidence and political leader. Results: The results of the study show that there is a significant relationship between volatility and degree of foreign ownership in mainland China, where an increased degree of foreign ownership leads to reduced volatility. The study also finds that Stock Connect has had a significant impact on volatility and foreign ownership, where foreign ownership is higher after Stock Connect while volatility is significantly lower.

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2008年發生全球金融危機，造成各國經濟大幅衰退。中國大陸於2009年開始積極推動人民幣國際化，希望降低對外貿易與跨境資本流動對美元的依賴程度。中國大陸雖有龐大的境外人民幣資金池，但由於欠缺人民幣回流管道，因而人民幣資金至今仍無法雙向流動。因此，中國大陸於2014年11月17日推動滬港通試點，建立滬港股票交易互聯互通機制，試行中國大陸金融帳開放成效，以作為日後擴大試點開放政策的參考。 本研究結果發現，經由滬港通試點試辦，改革中國大陸資本市場，可避免對中國大陸金融市場造成重大影響，實現人民幣跨境計價及結算功能，並建構良好的人民幣回流機制。 / The world economy declines substantially, influenced by the global financial crisis in 2008. In order to reduce the dependence of cross-border fund flows and foreign trades on the US dollar, the mainland China reinforces its efforts in promoting the Renminbi (RMB) internationalization in 2009. But, due to the capital control, the free fund flows of the RMB are not feasible even if there is a massive RMB pool worldwide. In order for the liberalization of financial account, the mainland China built Shanghai - Hong Kong Stock Connect on November 17, 2014, as a reference of further expansion of the offshore use of the RMB in the future. This study shows that, reforms on China’s domestic capital market are crucial to avoid the significant impact of Shanghai - Hong Kong Stock Connect, as the openness of capital account, on the domestic financial markets. The financial reforms can also improve the cross-border settlement functions of the RMB to increase RMB denomination in trades, and reinforce the freer flows of the RMB.

上海證券交易所與香港聯合交易所於2014年11月17日啟動滬港通計劃，允許兩地投資者在本地交易所買賣對方市場的股票。本文試圖以漲跌幅限制之磁吸現象探討滬港通對上海股市的影響。文章延用Hsieh, Kim and Yang(2009)之Logit回歸，將參與滬股通之股票以換手率與市值區分，藉以檢測不同組合股票之磁吸現象。研究結果顯示，在樣本期間發現當較高市值股票漲幅達9.5%以上出現磁吸現象，當較低市值股票漲幅達9%以上出現冷卻現象。而兩種組合的股票跌幅達6%以上時均出現反轉效果。為比較滬港通前後之變化，本文加入虛擬變數以區分事件前後，研究結果顯示，滬港通啟動後較高市值股票跌幅達9.5%以上、較低市值股票漲幅達8%以上時出現磁吸現象，冷卻現象消失，可得知滬港通並沒有產生理性作用。本文發現已在兩地上市之A+H股的磁吸現象在滬港通啟動後消失，可推測資訊不對稱及交易規則讓A股的外國投資者無法選擇最佳策略，而雙重上市股票則可以讓其於價格觸發漲跌幅限制前調整交易策略。 / SSE and HKEX have provided Shanghai-Hong Kong Stock Connect since Nov. 17th, 2014, which allows investors in one market to trade shares listed on the other market through their local brokers. The article attempts to discuss the impact of Shanghai-Hong Kong Stock Connect on Shanghai stock market from the perspective of the magnet effect. Using a logit model proposed by Hsieh, Kim and Yang (2009), the thesis classifies the stocks as turnover rate and market capitalization, examining the magnet effect with different portfolios. The results demonstrate that the magnet effect appears as the price of large stocks increases 9.5% while the cool-off effect initiates as the price of small stocks decreases 9%. Reversal effect is found in both large and small stock when the decline of the price exceeds 6%. Moreover, a dummy variable is introduced in the regression to capture the difference made by the Connect. The evidence of magnet effect is shown respectively when the price of large stocks decreases 9.5% and when the price of small stocks decreases 8% after the Connect launched. Price limits fail to cool off the market. Therefore, the program may not rationalize Shanghai stock market. Due to the disappearance of magnet effect on A+H shares after the link between two markets, the thesis conjectures the program may provide an opportunity to switch to Hong Kong market before the price crosses the limit bound. However, information disadvantage and strict trading rules force foreign investors trading on A-shares to make suboptimal strategies.