---
kind: "unit"
title: "29"
title_heading: "Labor"
key: "subtB/chXL/subchJ/part4281"
level: "part"
label: "Part 4281"
heading: "Duties of Plan Sponsor Following Mass Withdrawal"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/29/subtB-chXL-subchJ-part4281"
sections_count: 20
---

# Part 4281 — Duties of Plan Sponsor Following Mass Withdrawal

Title 29 C.F.R. — Labor › Subtitle B — Regulations Relating to Labor › Chapter XL — Pension Benefit Guaranty Corporation › Subchapter J — Insolvency, Termination, and Other Rules Applicable to Multiemployer Plans

## Contents

- [Subpart A — General Provisions](/cfr/29/subtB-chXL-subchJ-part4281-subpartA.md)
- [Subpart B — Valuation of Plan Benefits and Plan Assets](/cfr/29/subtB-chXL-subchJ-part4281-subpartB.md)
- [Subpart C — Benefit Reductions](/cfr/29/subtB-chXL-subchJ-part4281-subpartC.md)
- [Subpart D — Benefit Suspensions](/cfr/29/subtB-chXL-subchJ-part4281-subpartD.md)