The U.S. managed health insurance industry includes about 1,000 companies with combined annual revenue of about $500 billion. The industry is highly concentrated with the 50 largest companies generating about 75% of revenue, according to a report by Research and Markets. The rising cost of medical care is driving the demand for health insurance products. Large companies and organizations have advantages in negotiating contracts with health care providers while small companies can compete by providing special coverage plans as part of government programs, such as Medicaid, or for specialized populations. The industry is highly automated and capital-intensive; annual revenue per employee is close to $1 million. For more information, visit http://www.researchandmarkets.com.