The decline in commercial premiums is showing no sign of slowing, according to the latest survey by the Risk and Insurance Management Society (RIMS).

Lines softened in most commercial classes in the third quarter of this year, with directors' and officers' liability posting the largest decrease at 3.9%. Average general liability premiums fell 3.2% and workers' compensation premiums were down 1.5%.

Only property premiums, which have been driven up by companies in regions exposed to earthquakes, recorded a rise in rates - up 2.1%.

"For the most part, pricing trends continue to be very positive for commercial buyers," RIMS director John Phelps said.

"All indicators point to further improvements in the fourth quarter, barring a major catastrophe."