This study looks at how foreign investment flows affected Nigeria’s stock market performance from 1994 to 2023. The paper utilised an ex-post facto research approach, and the Central Bank of Nigeria (CBN) bulletin, 2023, offered the data for analysis. Market capitalisation (MCAP) was the dependent variable in the study, and the independent variables used to measure foreign investment flows were foreign direct investment inflows (FDINF), outflows (FDIOUF), inflows from foreign portfolio investments (FPINF), and outflows from foreign portfolio investments (FPIOUT). The study tested the proposed hypotheses using the Ordinary Least Squares estimation approach. In order to determine the dependent variable, market capitalisation, the research examined the effects of four independent variables: FPI inflow, FDI inflows, and FPI outflows. The results show that the influx of FDI has little effect on market capitalisation. Outflows of FDI have a big effect on market capitalisation. Inflows of foreign portfolio investments have little effect on market capitalisation. Outflows from foreign portfolio investments dramatically increase the capitalisation of the stock market. As per the r2, changes in foreign investment variables in Nigeria may account for around 59% of the variations in stock market performance within the Nigerian economy. According to the study’s findings, foreign investment flows significantly affect Nigeria’s market capitalisation. Suggestions include promoting foreign direct investment inflows continuously, encouraging domestic companies to invest overseas, improving market transparency to draw in foreign portfolio investment inflows, and cautiously promoting outward investments to avoid excessive capital outflows.
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