It seems that there is a new comprehensive market research on the event processing market in the years 2013-2018 by Markets and Markets. I don't have the market research itself (it is quite expensive), but the site gives some details, according to the report, Markets&Markets forecast that the "CEP market" is expected to grow from $764.5 million in 2013 to $3,322.0 million in 2018. I wonder what this figures represent, it seems that this is beyond the accumulative sales of event processing platforms.
They also classify the market according to the following verticals:
BFSI: algorithmic trading, electronic transaction monitoring, dynamic pretrade analytics, data enrichment, fraud detection, governance, risk and compliance (GRC);
Transportation and Logistics: asset management and predictive scheduling and toll system management; healthcare: self-service proactive monitoring and alerting and governance, risk and compliance (GRC);
Telecommunication: mobile billboards, revenue assurance, network infrastructure monitoring and predictive CDR assessment;
Retail: inventory optimization, shoplifting detection and real-time marketing and customer engagement;
Energy and utilities: oil and gas operation management and nuclear crisis and smart grid energy management;
Manufacturing: shop floor automation and operational failure detection, infrastructure management and supply chain optimization;
Government, defense and aerospace: Intelligence and Security, emergency response services and geo-fencing and geospatial analysis;
Others: includes education and research
BFSI: algorithmic trading, electronic transaction monitoring, dynamic pretrade analytics, data enrichment, fraud detection, governance, risk and compliance (GRC);
Transportation and Logistics: asset management and predictive scheduling and toll system management; healthcare: self-service proactive monitoring and alerting and governance, risk and compliance (GRC);
Telecommunication: mobile billboards, revenue assurance, network infrastructure monitoring and predictive CDR assessment;
Retail: inventory optimization, shoplifting detection and real-time marketing and customer engagement;
Energy and utilities: oil and gas operation management and nuclear crisis and smart grid energy management;
Manufacturing: shop floor automation and operational failure detection, infrastructure management and supply chain optimization;
Government, defense and aerospace: Intelligence and Security, emergency response services and geo-fencing and geospatial analysis;
Others: includes education and research
Hope to get more insight towards this research.