News and prices: Vietnam stock market

Abstract

This study identifies and analyzes the relationship between "strong sentiment" phrases in news bulletins that appeared in the Vietnamese stock market from 2008 to 2023. A total of 18,826 news bulletins were analyzed, covering various types of financial information such as dividend payments, stock issuance, stock sale registration, and stock sales. Data were collected from transactions and essential announcements of listed companies on the Vietnamese stock market. The study identified five key clusters of information closely related to stock price fluctuations, including "cash dividend payments, additional stock issuance, supplementary stock listings, stock sale registrations, and completed stock sales." Among them, information on "cash dividend payments," "additional stock issuance," or "supplementary stock listings" can lead to inconsistent reactions depending on the context. The study also revealed that "stock sale registration" tends to cause more significant price volatility than "completed stock sales," reflecting a higher level of uncertainty from investors. This research not only contributes to behavioral finance theory but also provides substantial empirical evidence to assist investors in evaluating the impact of news on investment decisions.