Terence Kawaja of LUMA Partners has published a revised version of his ubiquitous display ad tech landscape chart. You can download it here.
A few things to bear in mind. This chart is far from perfect. Organization of such a fragmented and dynamic industry is flawed by its very nature. Many companies operate across several categories and there are distinctions within categories. This chart does not include many of the search players which are increasingly overlapping with display nor does it reflect whole categories such as lead generation and ecommerce which likewise utilize display advertising in their funnel, not to mention international companies which are barely reflected. At some point in the future I may construct an uber landscape which captures these and other players.