This research report examines the influence of advertising intensity on firm valuation in the case of Hindustan Unilever Limited (HUL), a leading Indian fast-moving consumer goods (FMCG) company. Operating in a high-rivalry sector, HUL treats advertising as an economic investment to shape consumer preference, premium pricing, and long-term brand equity. Using a secondary-data approach covering the period FY2016 to FY2023, the study compiles financial and operating data from annual reports and market-capitalization history. The report calculates advertising intensity—advertising and promotion expenditure relative to sales—alongside profitability ratios and market-based valuation indicators. The analysis reveals that while HUL's absolute advertising spend increased substantially over the decade, advertising intensity did not rise uniformly; it often declined during years of sharp revenue expansion. Empirical findings suggest the relationship between advertising intensity and valuation is not strongly linear in a same-year sense. Correlation between current intensity and market-capitalization-to-sales ratios is weak, though lagged relationships appear somewhat more positive. The study concludes that advertising intensity influences firm valuation indirectly and cumulatively by reinforcing brand strength and earnings quality. Valuation appears to depend on a broader integrated system including profitability, scale, and investor expectations rather than isolated expenditure ratios. For a mature market leader, optimal advertising productivity within a coherent strategic model is more vital than simply maximizing the intensity ratio.