29 C.F.R. § 4231.1

(a) Purpose. The purpose of this part is to prescribe notice requirements under section 4231 of ERISA for mergers and transfers of assets or liabilities among multiemployer pension plans. This part also interprets the other requirements of section 4231 and prescribes special rules for de minimis mergers and transfers. The collections of information in this part have been approved by the Office of Management and Budget under OMB control number 1212-0022.

(b) Scope. This part applies to mergers and transfers among multiemployer plans where all of the plans immediately before and immediately after the transaction are multiemployer plans covered by title IV of ERISA.