In several of those key lines, many of the same key players remain on top, with slight fluctuation in premiums.

In National Underwriter Property & Casualty's July print edition, we present our annual list of the Top 100 Groups and Top 100 Companies in P&C insurance. We also examine the top 5 writers of coverage in 10 key lines of business.

All of the lists are based on data supplied by S&P Global Market Intelligence.

Here, we present the top 5 writers in Personal (Private) Auto; Commercial Multi-Peril; Workers' Compensation; Fire; and D&O.

In several of those key lines, many of the same key players remain on top, with slight fluctuation in premiums. In Fire, Munich Re joins the list of top 5 performers, replacing Assurant Inc., which exits this year's list.

In order to put the numbers presented here in the appropriate context, it's helpful to consider how much combined ratio suffered between 2016 and 2017 in several key lines.

Commercial Multi-peril rose from 101 to 108 (with the majority of claims seen in property and business interruption), while Personal (Private) Auto moved downward from 106 to 102.5 (better, certainly, but still not below 100), according to Steven Weisbart, senior vice president and chief economist for the Insurance Information Institute.

One of the only bright spots was Workers' Compensation, which went down from 95 to 92. "Workers' Comp was profitable in 2016 and even more profitable in 2017 as a line, which kept things from getting even worse [overall]," said Weisbart.

The S&P Global Market Intelligence rankings in the individual lines of business reflect net premiums written (in $000s) with the exception of mono-line D&O, which is ranked by direct premiums written because NAIC statements do not disclose net premiums written for that line.

For more, check out NU's July issue.

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