Quote from TIBCO Press Release (see reference below):

TIBCO Software Inc. (Nasdaq: TIBX ) continued its market leadership in the fast-growing Complex Event Processing (CEP) space, according to a new report from IDC. TIBCO thus marked another year as the undisputed CEP leader, with a market share of 40.2 percent — twice the share of its closest competitor-while experiencing 52 percent year-over-year growth, according to the IDC study.

“CEP is the fastest-growing segment of the global event-driven middleware market,” according to Maureen Fleming, director of IDC’s BPM and middleware research program. “We expect this growth to continue as enterprises build event-driven applications that, in essence, act as real-time navigation systems for business.”

Reference (PRNewsWire):

TIBCO Leads Fast-Growing CEP Space, Says Leading IT Analyst Firm