D.C. Circuit decision calls into question the NLRB’s long-standing successor-bar doctrine
A recent decision from the U.S. Court of Appeals for the D.C. Circuit could significantly affect how employers approach labor relations following mergers and acquisitions involving unionized businesses.
In Hospital Menonita de Guayama, Inc. v. National Labor Relations Board, No. 22-1163 (D.C. Cir. July 21, 2026), the court rejected the National Labor Relations Board’s long-standing application of the successor-bar doctrine, which generally prevents a successor employer from challenging an incumbent union’s majority status for a period of time following an acquisition.
The decision does not necessarily eliminate the successor-bar doctrine in every case. More importantly, however, it requires the NLRB to reconsider the legal foundation for restricting an employer’s ability to question a union’s continued majority support after a change in ownership.
The ruling may therefore give employers acquiring unionized operations a new opportunity to evaluate whether the existing bargaining relationship should continue—and whether employees still support the incumbent union.
The Successor-Bar Doctrine
Under traditional NLRB precedent, an employer that acquires a unionized business and becomes a successor employer may be required to recognize and bargain with the incumbent union. The Board’s successor-bar doctrine has generally prevented the new employer from immediately challenging the union’s representative status, even where the employer has reason to believe that the union no longer enjoys majority support.
The policy underlying the doctrine has been stability. The Board has sought to prevent employers from using a change in ownership as an opportunity to undermine an existing bargaining relationship or encourage employees to abandon their union.
The practical consequence, however, has been that a purchaser could find itself obligated to bargain with a union for a period of time even when questions existed regarding whether the union continued to have majority support among the employees.
The D.C. Circuit’s Decision
The D.C. Circuit’s decision takes a different view of the NLRB’s authority.
Following the Supreme Court’s decision in Loper Bright Enterprises v. Raimondo, 144 S. Ct. 2244 (2024), which eliminated the longstanding framework known as Chevron deference requiring judicial deference to agency interpretations of ambiguous statutes, the court independently examined whether the National Labor Relations Act specifically authorizes the NLRB to impose a successor bar.
The court concluded that the Board had not identified sufficient statutory authority for preventing a successor employer from challenging a union’s majority status for a fixed period following an acquisition.
The decision therefore vacated the Board’s prior determination and sent the matter back for further consideration.
The ruling is particularly significant because it calls into question whether the NLRB may continue to rely on an administrative doctrine that effectively restricts an employer’s ability to seek an election after acquiring a unionized operation.
What Employers Should Consider
The decision may have practical consequences for companies involved in acquisitions of unionized businesses.
- Union status should be part of acquisition due diligence
Purchasers should conduct a careful review of the target company’s labor relations before closing. That review should include the applicable collective bargaining agreements, bargaining history, grievances, arbitration matters, unfair labor practice charges, employee turnover, and available information concerning employee support for the union.
The buyer should also consider whether the union’s support appears strong, divided, or potentially declining.
- The post-closing strategy may have changed
The decision could provide a path for certain successor employers to question an incumbent union’s continued majority support sooner than previously permitted.
Depending on how the NLRB responds to the D.C. Circuit’s ruling, an acquiring employer may have greater flexibility to pursue an NLRB representation election rather than assuming that recognition and bargaining with the incumbent union must continue without challenge.
Employers should, however, proceed carefully. The decision does not mean that every successor employer can simply refuse to recognize a union or terminate bargaining obligations.
- Acquisition agreements may need to address labor-relations contingencies
Buyers and sellers should consider whether the transaction documents adequately address the potential consequences of the D.C. Circuit’s decision.
Issues may include representations regarding union support, the status of collective bargaining agreements, pending labor disputes, and the parties’ expectations concerning recognition and bargaining following closing.
The parties may also want to consider how a change in the legal landscape could affect integration plans, labor costs, and the buyer’s ability to restructure operations.
- Employers should not assume that the decision eliminates all successor obligations
The D.C. Circuit’s decision should not be interpreted as a blanket authorization to disregard existing bargaining obligations.
Successor-employer issues under the NLRA remain highly fact-specific. An employer’s obligations may depend on whether it is a statutory successor, whether it has adopted the predecessor’s workforce, whether it has made changes to terms and conditions of employment, and whether other doctrines governing successorship apply.
In addition, the NLRB will have to determine how to respond to the D.C. Circuit’s ruling, and the legal landscape could continue to evolve.
A Potentially Significant Development for M&A Transactions
For years, the successor-bar doctrine has been an important consideration for employers purchasing unionized businesses. The D.C. Circuit’s decision creates uncertainty around the Board’s ability to prevent a successor employer from testing whether employees continue to support the incumbent union.
For employers considering an acquisition, this may create a new strategic consideration: Is the union’s majority status something that should be evaluated—and potentially challenged—as part of the post-closing labor strategy?
The answer will depend on the facts of each transaction and on how the NLRB responds to the court’s decision. Nevertheless, companies involved in acquisitions of unionized operations should closely monitor developments and consider the potential implications during both pre-closing labor due diligence and post-closing integration planning.
The St. Louis employment attorneys at McMahon Berger have been representing employers across the country in labor and employment matters for over seventy years and are available to discuss these issues and others. As always, the foregoing is for informational purposes only and does not constitute legal advice regarding any particular situation as every situation must be evaluated on its own facts. The choice of a lawyer is an important decision and should not be based solely on advertisements.
