29 U.S. Code § 1350 - Missing participants
A transfer to the corporation under this section shall be treated as a transfer of assets from a terminated plan to the corporation as trustee, and shall be held with assets of terminated plans for which the corporation is trustee under section 1342 of this title, subject to the rules set forth in that section.
The term “missing participant” means a participant or beneficiary under a terminating plan whom the plan administrator cannot locate after a diligent search.
The corporation shall prescribe rules similar to the rules in subsection (a) for multiemployer plans covered by this subchapter that terminate under section 1341a of this title.
The plan administrator of a plan described in paragraph (4) may elect to transfer a missing participant’s benefits to the corporation upon termination of the plan.
The corporation shall prescribe such regulations as are necessary to carry out the purposes of this section, including rules relating to what will be considered a diligent search, the amount payable to the corporation, and the amount to be paid by the corporation.
 So in original. The comma probably should not appear.
2008—Subsec. (d)(4)(A)(ii), (iii). Pub. L. 110–458 added cls. (ii) and (iii) and struck out former cl. (ii) which read as follows: “which is not a plan described in paragraphs (2) through (11) of section 1321(b) of this title, and”.
2006—Subsecs. (c) to (e). Pub. L. 109–280 added subsecs. (c) and (d) and redesignated former subsec. (c) as (e).
Amendment by Pub. L. 110–458 effective as if included in the provisions of Pub. L. 109–280 to which the amendment relates, except as otherwise provided, see section 112 of Pub. L. 110–458, set out as a note under section 72 of Title 26, Internal Revenue Code.
Amendment by Pub. L. 109–280 applicable to distributions made after final regulations implementing subsections (c) and (d) of this section are prescribed, see section 410(c) of Pub. L. 109–280, set out as a note under section 1056 of this title.