This study tried to determine firm-specific variables that affect the price-to-earnings ratios of the listed tourism companies at Borsa
Istanbul in Turkey over the period 2012q3 - 2020q3. For this purpose, the quarterly financial data of tourism companies were analyzed
by using the Generalized Moments Method (GMM). As a result of the analysis, it was determined that a positive relationship existed
between Tobin’s Q ratio and price-to-earnings ratio, whereas a negative relationship existed between leverage ratio as well as stock
price volatility and price-to-earnings ratio. It was determined that no statistically significant relationship existed between sales size
and price-to-earnings ratio