CFR › Title 29 › Part 4050Part 4050 — Missing ParticipantsSubpart A — Single-Employer Plans Covered by Title IV§ 4050.101— Purpose and scope.§ 4050.102— Definitions.§ 4050.103— Duties of plan administrator.§ 4050.104— Diligent search.§ 4050.105— Filing with PBGC.§ 4050.106— Missing participant benefits.§ 4050.107— PBGC discretion.Subpart B — Defined Contribution Plans§ 4050.201— Purpose and scope.§ 4050.202— Definitions.§ 4050.203— Options and duties of plan.§ 4050.204— Diligent search.§ 4050.205— Filing with PBGC.§ 4050.206— Missing participant benefits.§ 4050.207— PBGC discretion.Subpart C — Certain Defined Benefit Plans Not Covered by Title IV§ 4050.301— Purpose and scope.§ 4050.302— Definitions.§ 4050.303— Options and duties of plan administrator.§ 4050.304— Diligent search.§ 4050.305— Filing with PBGC.§ 4050.306— Missing participant benefits.§ 4050.307— PBGC discretion.Subpart D — Multiemployer Plans Covered by Title IV§ 4050.401— Purpose and scope.§ 4050.402— Definitions.§ 4050.403— Duties of plan sponsor.§ 4050.404— Diligent search.§ 4050.405— Filing with PBGC.§ 4050.406— Missing participant benefits.§ 4050.407— PBGC discretion.