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U.S. states employ a variety of rate regulation mechanisms, including prior approval, modified prior approval, file and use, and use and file. Some states do not require explicit regulatory approval prior to insurers using new rates. This analysis is based on when rate filings are "disposed" by state regulators and does not take into account when those new rates became effective for new and renewal business. In some instances, a new rate may have been in effect prior to the month the related filing was approved by a regulator.
A 4.2% rate increase approved for State Compensation Insurance Fund during the fourth quarter...