Stock Price Dataset for Portfolio Optimization Study

This dataset contains adjusted closing prices for 27 major U.S. companies over a continuous 10-year period from 2014-12-31 to 2024-12-30. It serves as the empirical foundation for the study “Portfolio Optimization Decision with Stock Return Forecasting Driven by LSTM–KAN.” Each record corresponds to a trading observation within this period, and each column (except `Date`) represents the adjusted closing price of a specific company. No missing values or preprocessing steps were applied.