AppNexus raised $319 million across several rounds, including a $62.7M Series F (Apr 1, 2015), an undisclosed Series F (2015) tranche, and a $31M Series F (Sep 30, 2016) that helped scale its marketplace and platform operations. Founded in 2007, AppNexus built a full-stack programmatic advertising platform offering DSP, SSP, ad-exchange and analytics powering major buyers and publishers globally. Capital was deployed to expand product engineering, global data centers, and publisher tools, enabling low-latency trading, yield optimization, and integrations with major ecosystem players across the ad stack.