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Liberty Mutual Holding Co. Inc. was the largest workers compensation insurer nationwide in 2012 with about $4.2 billion in direct written premiums, according to the latest market share report by the National Association of Insurance Commissioners.

Boston-based Liberty Mutual held 8.73% of the workers comp market for 2012, according to data published Monday by Washington-based NAIC.

Travelers Cos. Inc. was the second-largest comp insurer with 7.94% of the market, or $3.8 billion in direct written premiums, while The Hartford Financial Services Group Inc. held the third-largest share with 6.86% of the market, or nearly $3.3 billion in written premiums.

American International Group Inc. held 6.16% of last year’s comp market with nearly $3 billion in written premiums, and Zurich Insurance Co. Ltd. captured 5.79% of the market with $2.8 billion in premiums.

The list of top 25 workers comp insurers, as well as other property/casualty insurance lines is available on the NAIC’s website. The tentative data is scheduled to be finalized by the end of this month.