17 C.F.R. § 420.4
(b) Records to be made and preserved by entities that are subject to the recordkeeping provisions of the SEC, Treasury, or the appropriate regulatory agencies for financial institutions. As an aggregating entity, compliance by a registered broker or dealer, registered government securities broker or dealer, noticed financial institution, depository institution that exercises investment discretion, registered investment adviser, or registered investment company with the applicable recordkeeping provisions of the SEC, Treasury, or the appropriate regulatory agencies for financial institutions shall constitute compliance with this section, provided that, if such entity is also the designated filing entity, it:
(c) Records to be made and preserved by other entities.
(2) If such aggregating entity is also the designated filing entity, then in addition it shall make and preserve the following records:
(3) With respect to the records required by paragraphs (c)(1) and (2) of this section, each such aggregating entity shall preserve such records for a period of not less than six years, the first two years in an easily accessible place. If an aggregating entity maintains its records at a location other than its principal place of business, the aggregating entity must maintain an index that states the location of the records, and such index must be easily accessible at all times.
(Approved by the Office of Management and Budget under control number 1535-0089)