随着中国金融市场对外开放的加速，北向资金作为境外投资者的重要组成部分，其在A股市场的交易行为备受关注。本文旨在分析北向资金的动量交易特征，并探究其背后的交易策略与风格。通过对2018至2023年北向资金的持股数据进行分析，本文首先发现北向资金持股对股票动量效应存在正向贡献。其次，本文通过构建动量交易指标，全面研究了北向资金的动量交易行为，揭示北向资金整体上表现为动量交易者，但在相对买入和卖出交易上表现出非对称特征，倾向于动量买入和逆向卖出交易。进一步分析发现，北向资金对表现优异的股票有更高的交易热情，倾向于在股价启动后加仓，同时对获利股票提前减仓止盈，表现出一定的择时策略。北向资金的交易模式受到市场状态的影响，市场稳定和流动性充足的条件下，北向资金更倾向于动量交易，而更高的市场收益率和动量策略收益率则同向增强了动量买入交易和逆向卖出交易。基于实证研究的结论，本文认为引入更多成熟的国际投资者有助于我国资本市场加速发展和完善，北向资金的非对称性交易策略有助于推动股市长牛。因此，论文建议继续推动资本市场改革和对外开放，加强对境外投资者的引导和监管，以促进更加健康、稳定的市场发展。
With the accelerated opening of China‘s financial markets, northbound capital, as a crucial component of foreign investors, have garnered significant attention for their trading behaviors in the A-share market. This paper aims to analyze the momentum trading characteristics of northbound capital and explore the underlying trading strategies and styles.By analyzing the holding data of northbound capital from 2018 to 2023, this study initially finds a positive contribution of northbound holdings to the stock momentum effect. Furthermore, by constructing a momentum trading indicator, the paper comprehensively examines the momentum trading behavior of northbound capital, revealing that it generally behaves as a momentum trader. However, it exhibits asymmetric characteristics in relative buying and selling transactions, showing a preference for momentum buying and contrarian selling. Further analysis indicates that northbound capital has a higher trading enthusiasm for outperforming stocks, tending to add the position after price starts moving and reduce holdings to profit before a pullback, displaying a certain timing strategy. The trading pattern of northbound capital is influenced by market conditions; under stable market and ample liquidity conditions, northbound capital tends to engage in momentum trading, while higher market return rates and momentum strategy returns enhance both momentum buying and contrarian selling transactions.Based on empirical research, this paper suggests that introducing more mature international investors could help accelerate the development and improvement of China‘s capital market. The asymmetric trading strategies of northbound capital could contribute to a long-term bull market. Therefore, the paper recommends continuing to promote capital market reform and opening up, strengthening the guidance and supervision of foreign investors to foster a healthier and more stable market development.
