Two-thirds of the names on NU's exclusive annual list of the Top 100 P&C insurance groups saw net-premiums written increase in 2010—but combined ratios worsened for almost as many.

Sixty-five out of the 100 groups (ranked by net-premiums written in 2010) recorded premium jumps last year, with just about all of the double-digit leaps explained by acquisitions, not organic growth.

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