We analyze insider trading patterns in firms listed in Borsa Istanbul using a unique and most comprehensive regulatory dataset for the first time. The dataset provided by Turkey's Central Securities Depository contains the number and volume of insiders' buy and sell transactions during the period 2009-2015. We observe that (i) corporate insiders are active traders in Turkish stock market, (ii) the trading patterns vary across different sized firms, and finally (iii) insiders at different positions trade differently. This study enhances understanding of insider trading behavior in an emerging market. Furthermore, our results have important implications for regulatory authorities who are responsible to maintain well-functioning financial markets which will facilitate increased prosperity and economic growth.