While the total market share of the 10-largest property-casualty insurance groups edged closer to 50 percent last year, the playing field spread out a little bit more for commercial lines insurers in 2006, according to figures compiled from a National Underwriter subsidiary, Highline Data. The same insurance groups comprised the top 10, but some took slightly smaller pieces of the overall pie.

Indeed, the combined market share of the top 10 insurers–based on direct written premiums for all lines of business, and across all regions–was 48.6 percent in 2006, information from regulatory filings published online in Highline Data's Insurance Analyst PRO database show.

According to Highline Data market share reports for the prior two years, the same 10 insurance groups took slightly smaller slices of the overall pie, grabbing a 48.2 percent share in 2005 and 47.9 percent in 2004.

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