We examine cross-sectional determinants of the informativeness of analyst research, i.e., their effect on security prices, controlling for endogeneity among the factors affecting informativeness. Analyst reports are more informative when the potential brokerage profits are higher (e.g., high trading volume, high volatility, and high institutional ownership) and lower when information processing costs (e.g., more business segments) are high. We also find that the informativeness of analyst research and informativeness of financial statements are complements.