Alongside SAP Ventures in OpenX's $20m D round are AOL Ventures, the corporate venturing unit of internet services provider AOL, Japan-based financial services group Mitsui, Presidio Ventures, which invests on behalf of Japanese conglomerate Sumitomo and venture capital firms Accel Partners, DAG Ventures and Index Ventures.

SAP Ventures, the corporate venturing unit of Germany-based software group SAP, is leading a $20m series D round in US-based online advertising exchange OpenX.

Alongside SAP Ventures in the D round are AOL Ventures, the corporate venturing unit of internet services provider AOL, Japan-based financial services group Mitsui, Presidio Ventures, which invests on behalf of Japanese conglomerate Sumitomo and venture capital firms Accel Partners, DAG Ventures and Index Ventures.

Tim Cadogan, chief executive of OpenX, which is chaired by…