D.C. Circuit Rejects NLRB’s Successor Bar Doctrine in Significant Post-Loper Bright Decision

In a significant decision for employers involved in acquisitions and business transfers, the U.S. Court of Appeals for the D.C. Circuit recently held that the National Labor Relations Board’s successor bar doctrine is inconsistent with the National Labor Relations Act (“NLRA”). See Hospital Menonita de Guayama v. NLRB, No. 22-1163 (D.C. Cir. July 21, 2026).

Under the successor bar doctrine, a successor employer that acquires a unionized operation and retains a majority of the predecessor’s represented workforce generally must recognize and bargain with the incumbent union for a reasonable period, typically up to one year, even if the employer believes the union no longer enjoys majority support. During that period, employees and employers are generally barred from challenging the union’s representative status.

Reconsidering the issue after the Supreme Court’s 2024 decision in Loper Bright Enterprises v. Raimondo, the D.C. Circuit concluded that the doctrine improperly restricts employees’ statutory rights to choose whether to be represented by a union and cannot be justified as an exercise of the Board’s policymaking authority. The majority emphasized that courts must independently interpret the NLRA rather than defer to the NLRB’s interpretation.

Because the D.C. Circuit remanded the case to the NLRB for further proceedings, however, the full impact of the decision remains uncertain. Further appellate activity or Board action is possible, and employers should monitor developments closely.

Why It Matters

The ruling could have substantial implications for employers acquiring unionized businesses. In the D.C. Circuit, successor employers may have a stronger basis to challenge an incumbent union’s status where there is evidence that the union lacks majority support, rather than being required to wait up to one year under the successor bar doctrine before doing so. That said, employers should not view the decision as eliminating bargaining obligations following an acquisition. Traditional successorship principles still apply, and a purchaser may be required to recognize and bargain with an incumbent union after hiring a substantial and representative complement of the predecessor’s workforce. What the decision changes is the removal of the automatic period during which the union’s majority status generally could not be challenged following a transaction.

For employers contemplating acquisitions of unionized operations, the decision underscores the importance of carefully evaluating labor relations issues during due diligence and transaction planning. In addition to assessing potential successorship obligations, buyers may wish to take a closer look at the strength of employee support for an incumbent union and other labor-related considerations that could affect post-closing bargaining obligations, integration strategies, and whether there may be a basis to challenge the union’s majority status after closing. We will continue to monitor the NLRB’s response to the decision and how the Board and courts address these issues going forward.

Potential Challenges to Other Board Doctrines

The decision is also notable as another example of the judiciary’s post-Loper Bright willingness to scrutinize long-standing agency interpretations. The D.C. Circuit expressly rejected the Board’s argument that it possessed discretion to impose the successor bar as a matter of labor policy, signaling that other NLRB doctrines lacking a clear statutory foundation may face renewed challenges.

For questions about how this decision may affect your labor strategy or bargaining obligations, please contact your labor and employment counsel.