Eligible employer
Eligible employer means the employer, as defined in section 4001 of ERISA, as it existed on the date of its initial partial or complete withdrawal, as applicable. An eligible employer shall continue to be an eligible employer notwithstanding the occurrence of any of the following events:
(1) A restoration involving a mere change in identity, form or place of organization, however effected;
(2) A reorganization involving a liquidation into a parent corporation;
(3) A merger, consolidation or division solely between (or among) trades or businesses (whether or not incorporated) of the employer; or
(4) An acquisition by or of, or a merger or combination with another trade or business.
Source
29 CFR § 4207.2
Scoping language
The following terms are defined in 4001.2 of this chapter: employer, ERISA, IRS, Multiemployer Act, multiemployer plan, nonforfeitable benefit, PBGC, plan, and plan year.