211 CMR, § 15.11
Any Statistical Report or Annual Statistical Compilation that is regularly provided to the Commissioner shall be available to the public.
A Statistical Agent shall not provide data submitted to it by any single Insurer, or any compilation thereof, to any party other than that Insurer or the Commissioner without the Insurer's written consent. Unless specifically requested by the Commissioner, Statistical Agents shall not provide the aggregated data of all reporting insurers to the Commissioner or any other party in a format where it appears to be possible to identify information about individual Insurers that such Insurers have not already filed in the public domain, or could be used to identify a particular policyholder or claimant.
211 CMR, § 15.11