We examine the effect of option listing on the immediate stock-price response to earnings announcements. Contrary to prior studies using earlier data, we find firms initiating option trading after 1986 fail to exhibit a significant decline in earnings response. We then examine 420 firms initiating option trading during 1973–1993. In a series of tests controlling for market-wide effects and changing firm size we find some evidence that option listing may actually increase the stock-price response to earnings, but no evidence listing reduces the response. Both longitudinal and cross-sectional tests produce similar results.