ROC Exhibitions, Inc., a privately held company, holds equity positions in nine trade shows that it organizes. ROC succeeds in serving niche markets because a thorough, quick-thinking and cross-trained staff recognizes the needs of diverse industries, according to Marc Rosenstock, the company?s president. ROC was established in 1994 to build on opportunities that developed for Show Management & Services Inc. (SMS), a sister company formed in 1988.