More companies are increasing the amount of director and officers liability coverage they purchase, while pricing for private companies buying the coverage may be showing signs of a hardening market, according to survey released  by Towers Watson&Co.

The report, “Directors and Officers Liability: 2011 Survey of Insurance Purchasing Trends,” surveyed 401 organizations that buy D&O liability insurance. The group includes public, private and nonprofit companies. One-quarter of public companies and 14% of private/nonprofit organizations said they increased their D&O limits of liability.