ACE USA

AIG (Chartis)
American Compensation Insurance (RTW)

AmTrust

Berkley Administrators

Bridgefield Insurance (Summit Holdings)

Comp Options
Chubb Group of Insurance Companies

Cincinnati Insurance
Clarendon National Insurance Company
CNA

Companion Property & Casualty

Continental Western Insurance Co.

Crum&Forster

Everest National Insurance
Farmers Insurance
Federated Mutual Insurance Company
Fireman's Fund

First Cardinal Corp (MA Retail Merchants WC Group)

Frankenmuth Insurance
Hartford
Hawkeye Security Insurance Company
ICW Group

IWIF (MD)

Kansas City Restaurant & Hospitality Assc. Trust
  Kentucky Employers Mutual Insurance (KEMI)

Liberty Mutual Insurance Group
Liberty Northwest

Nationwide Insurance

New York State Insurance Fund (NYSIF)

Old Republic Insurance
One Beacon Insurance
Pinnacol Assurance

PMA Group

RAS Companies (Dakota Truck Underwriters)

ReliaMax

Secura Insurance Companies
Society Insurance Company
State Compensation Insurance Fund (SCIF) (CA)
State Fund Mutual Companies (WI)

Texas Mutual Insurance

The Zenith Insurance Company
Travelers Property & Casualty

Union Insurance

Virginia Surety
Wausau Insurance Group
West Bend Mutual Insurance Company

Workers' Comp Fund (WCF) (UT)

XL Specialty
Zurich