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Influence of Net Profit Margin on the Market Value of Listed Companies in Nigeria

Abstract

Net profit margin is an important profitability indicator that measures the proportion of revenue retained as profit after all operating expenses, finance costs, taxes, and other applicable expenses have been deducted. It provides an indication of a company's ability to convert revenue into net earnings and reflects the combined effects of cost management, pricing decisions, operational efficiency, financing decisions, and taxation. Market value represents the value assigned to a company by investors in the capital market based on its current financial position, future earning potential, growth prospects, risk profile, and expected returns. A strong net profit margin may signal effective management and sustainable earnings capacity, potentially increasing investor confidence and market valuation. In Nigeria, listed companies operate in an economic environment characterized by inflation, exchange rate volatility, high operating costs, changing interest rates, fluctuations in consumer purchasing power, and economic policy uncertainty. These conditions can significantly affect corporate expenses, earnings, and consequently the market valuation of listed companies. Investors therefore require reliable profitability information when assessing the attractiveness and future prospects of listed securities. Regulatory institutions such as the Financial Reporting Council of Nigeria (FRCN), the Securities and Exchange Commission (SEC), and the Nigerian Exchange Group (NGX) promote transparent financial reporting and corporate governance practices that facilitate informed investment decisions and effective capital market operations. Despite these regulatory efforts, differences in profitability and market valuation persist among listed companies, raising questions about the extent to which net profit margin influences market value. Although previous studies have examined profitability, financial performance, and firm value, empirical evidence regarding the influence of net profit margin on the market value of listed companies in Nigeria remains limited and inconclusive. Against this background, this study investigates the influence of net profit margin on the market value of listed companies in Nigeria. The study is anchored on Signaling Theory, Efficient Market Hypothesis (EMH), and Agency Theory. Signaling Theory suggests that a strong net profit margin can provide investors with a positive signal concerning management efficiency, cost control, pricing ability, and the sustainability of corporate earnings. The Efficient Market Hypothesis suggests that publicly available financial information, including profitability indicators, is reflected in security prices as investors respond to information concerning corporate performance and future prospects. Agency Theory explains that effective managerial monitoring can reduce inefficient resource utilization and opportunistic decisions, thereby improving profitability and potentially increasing shareholder value. Collectively, these theoretical perspectives provide a comprehensive framework for explaining the relationship between net profit margin and the market value of listed companies in Nigeria. The study adopts a quantitative research design using a structured questionnaire administered to chief financial officers, finance managers, accountants, financial controllers, internal auditors, external auditors, investment analysts, portfolio managers, stockbrokers, fund managers, institutional investors, and other professionals involved in financial management and investment decisions within selected listed companies in Nigeria. A stratified random sampling technique will be employed to ensure adequate representation of companies operating in the financial services, manufacturing, consumer goods, industrial goods, oil and gas, telecommunications, agriculture, healthcare, and other sectors listed on the Nigerian Exchange Group (NGX). Net profit margin will be measured using net income relative to revenue, earnings conversion efficiency, expense management, cost control, consistency of net earnings, and sustainability of profit margins, while market value will be measured using market capitalization, Tobin's Q, price-to-book ratio, share price performance, and overall market valuation. Primary data collected from respondents will be analyzed using descriptive statistics to summarize respondents' demographic characteristics and perceptions regarding net profit margin and market value. Structural Equation Modeling (SEM) will be employed to examine the influence of net profit margin on market value. The measurement model will be evaluated using Cronbach's Alpha, Composite Reliability (CR), Average Variance Extracted (AVE), and Confirmatory Factor Analysis (CFA) to establish the reliability and validity of the research instrument. Additional diagnostic tests, including multicollinearity assessment, common method bias analysis, and model fit indices such as the Comparative Fit Index (CFI), Tucker-Lewis Index (TLI), Root Mean Square Error of Approximation (RMSEA), and Standardized Root Mean Square Residual (SRMR), will be conducted to ensure the adequacy, consistency, reliability, and robustness of the structural model. The study anticipates that net profit margin will have a significant positive influence on the market value of listed companies in Nigeria. Companies with higher and more sustainable net profit margins are expected to attract greater investor confidence because strong net margins may indicate effective cost management, efficient operations, sound pricing decisions, effective financial management, and stronger earnings-generating capacity. Higher net profitability may also increase the company's capacity to pay dividends, reinvest in productive activities, reduce financial risk, and pursue growth opportunities, thereby improving investors' expectations regarding future returns. Consequently, stronger net profit margins may increase demand for a company's shares and contribute to higher market valuation. Conversely, declining or persistently low net profit margins may signal rising operating costs, weak pricing power, excessive financial expenses, inefficient resource utilization, or declining business performance, potentially reducing investor confidence and market value. Therefore, sustained improvement in net profit margin is expected to contribute significantly to stronger market valuation and shareholder wealth among listed companies in Nigeria. This study is expected to make significant theoretical and empirical contributions to the literature on profitability, financial reporting, corporate finance, and capital market valuation by providing comprehensive evidence on the relationship between net profit margin and the market value of listed companies in Nigeria. Unlike previous studies that broadly examined profitability or financial performance, this research specifically evaluates net profit margin as a determinant of market value using primary data and Structural Equation Modeling (SEM). The findings will provide valuable insights for the Financial Reporting Council of Nigeria (FRCN), the Securities and Exchange Commission (SEC), the Nigerian Exchange Group (NGX), listed companies, investors, financial analysts, professional accounting bodies, policymakers, regulators, and academic researchers regarding the importance of sustainable net profitability in corporate valuation. The study will also provide evidence-based recommendations for improving cost management, strengthening operational efficiency, optimizing pricing strategies, managing financing costs, improving earnings sustainability, and promoting sustainable market value and shareholder wealth among listed companies in Nigeria.

Keywords: Net profit margin, market value, listed companies, profitability, financial performance, earnings, investor confidence, corporate valuation, shareholder wealth, Structural Equation Modeling (SEM), Nigeria.