The National Association of Insurance Commissioners has ranked the top 25 Workers' Compensation insurance companies and groups by market share of direct premiums written for 2015.

Direct written premiums totaled just shy of $57.2 billion for the top 25, an increase from 2014's $54.92 billion. The top 25 carriers accounted for 69.15% of the total direct premiums written, with the top 10 bringing in 46.23%, or about $26.44 billion. The top four carriers represent just under a quarter (23.42%) of total direct premiums written.

The top 10 carriers remained the same as in 2014, but with different rankings.

PC360 previously covered the top 10 commercial auto carriers for 2015, top 10 personal auto carriers for 2015, top 10 P&C carriers for 2015, and the top 10 Homeowners' insurance carriers for 2015.

Continue reading to find out which companies ranked in NAIC's list of top 10 Workers' Compensation companies and groups:

10. Old Republic

2014 Ranking: 10.

Direct Premiums Written, 2015: $1.44 billion.

Direct Premiums Written, 2014: $1.41 billion.

2015 Market Share: 2.53%.

2014 Market Share: 2.57%.

2015 Cumulative Market Share: 46.23%.

9. State Compensation Insurance Fund

2014 Ranking: 9.

Direct Premiums Written, 2015: $1.64 billion.

Direct Premiums Written, 2014: $1.53 billion.

2015 Market Share: 2.87%.

2014 Market Share: 2.78%.

2015 Cumulative Market Share: 43.7%.

8. NYSIF, New York State Insurance Fund

2014 Ranking: 7.

Direct Premiums Written, 2015: $2.44 billion.

Direct Premiums Written, 2014: $2.37 billion.

2015 Market Share: 4.26%.

2014 Market Share: 4.32%.

2015 Cumulative Market Share: 40.83%.

7. Liberty Mutual

2014 Ranking: 4.

Direct Premiums Written, 2015: $2.48 billion.

Direct Premiums Written, 2014: $2.66 billion.

2015 Market Share: 4.34%.

2014 Market Share: 4.84%.

2015 Cumulative Market Share: 36.57%.

6. Berkshire Hathaway

2014 Ranking: 8.

Direct Premiums Written, 2015: $2.48 billion.

Direct Premiums Written, 2014: $2.14 billion.

2015 Market Share: 4.34%.

2014 Market Share: 3.90%.

2015 Cumulative Market Share: 32.24%.

5. American International Group

2014 Ranking: 3.

Direct Premiums Written, 2015: $2.56 billion.

Direct Premiums Written, 2014: $2.71 billion.

2015 Market Share: 4.48%.

2014 Market Share: 4.93%.

2015 Cumulative Market Share: 27.9%.

4. AmTrust NGH

2014 Ranking: 6.

Direct Premiums Written, 2015: $2.74 billion.

Direct Premiums Written, 2014: $2.44 billion.

2015 Market Share: 4.8%.

2014 Market Share: 4.44%.

2015 Cumulative Market Share: 23.42%.

3. Zurich Insurance

2014 Ranking: 5.

Direct Premiums Written, 2015: $2.86 billion.

Direct Premiums Written, 2014: $2.60 billion.

2015 Market Share: 5%.

2014 Market Share: 4.74%.

2015 Cumulative Market Share: 18.62%.

2. Hartford Casualty Insurance Co.

2014 Ranking: 2.

Direct Premiums Written, 2015: $3.32 billion.

Direct Premiums Written, 2014: $3.21 billion.

2015 Market Share: 5.81%.

2014 Market Share: 5.85%.

2015 Cumulative Market Share: 13.62%.

1. Travelers

2014 Ranking: 1.

Direct Premiums Written, 2015: $4.47 billion.

Direct Premiums Written, 2014: $4.32 billion.

2015 Market Share: 7.81%.

2014 Market Share: 7.87%.

2015 Cumulative Market Share: 7.81%.

Special Reports /

Top 10 Workers' Comp carriers, as ranked by NAIC

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