We provide a descriptive examination of the trading activities of one of the most important intermediaries in global financial markets - the OTC derivatives dealer. These dealers play a central role in the provision of derivative products and in the intermediation of market risks faced by financial and non-financial firms alike. Utilizing a unique database, we analyze the derivatives holdings of 264 dealers spanning 34 countries over the period 1995-2001. We document the geographic composition of dealers on both country and regional levels as well as analyze trends in dealer holdings on an aggregate and individual product level. We further analyze the extent of global merger activity among dealers and resulting consolidation effects. Finally, we investigate at the individual dealer level the extent and evolution of their array of product offerings.