Defense Industrial Merger Review Act

Summary#

This bill would make the Department of Defense (DoD) review certain investment deals that give investment companies big ownership or control of firms that supply the military. The main change is a new premerger notice and DoD review when an investment company would get at least 25% equity or control of a “major defense supplier.” The bill also orders a review every three years of mergers and acquisitions affecting major defense suppliers and a report to Congress.

• Parties must file a premerger notification to DoD for covered transactions, consistent with a prior law on such notices.
• DoD must review each notice and assess effects on national security, competition for defense contracts, critical supplies and technologies, and financial stability of the supplier and the investor.
• Within 30 days of receiving a notice, DoD must send a written report of its review to the Federal Trade Commission or the Antitrust Division of the Justice Department.
• The Assistant Secretary of Defense for Industrial Base Policy must do a review every three years of merger and acquisition activity involving major defense suppliers and report findings to congressional defense committees by Dec 31, 2027, and every three years after.

What it means for you#

• Investment companies and private equity firms: If you would get 25% or more ownership or otherwise control a company that supplies the DoD, you must submit a premerger notice to DoD and wait for its review. The bill requires prior review before completing the deal.

• Major defense suppliers (prime contractors, subcontractors, companies with defense-relevant tech): Deals that give an investment company large ownership or control will face DoD review. This could add steps and time before a transaction closes.

• Department of Defense: DoD must run case-by-case reviews of covered transactions and produce reports to antitrust agencies. DoD must also run and report on a triennial review of industry merger activity.

• Federal Trade Commission / Justice Department Antitrust Division: These agencies will receive DoD reports on covered transactions within 30 days of DoD getting a notice. They may still carry out any separate antitrust reviews.

• Congressional defense committees: They will receive a triennial report on how mergers and acquisitions have affected the defense industrial base.

• Contractors and suppliers to DoD: A change in ownership or control could be reviewed for effects on your ability to provide goods or services. This may affect future contracts or require additional documentation.

• What is unclear: The bill requires DoD review and a report to antitrust authorities, but it does not clearly say whether DoD can block a deal, impose conditions, or set a fixed timeline beyond the 30-day reporting step. It is also not clear how this review interacts with existing antitrust or national security review processes.

Expenses#

No publicly available information.

• The bill would likely increase DoD administrative work to do individual transaction reviews and to run the triennial industry review.
• Investment companies and target firms could face additional compliance costs (legal advice, preparation of notices, delays).
• Antitrust agencies may see additional workload from receiving DoD reports and coordinating reviews.
• The bill does not include a fiscal note or specific budget estimates in the supplied material.

Proponents' View#

• The bill appears intended to protect national security by having DoD review large investments in firms that supply the military or hold defense-relevant technology.
• It could be seen as improving oversight of the defense industrial base by checking whether new owners could restrict critical supplies or technologies.
• The required DoD assessments (competition, supply risks, financial stability, stewardship of military capabilities) aim to identify risks that could affect current or future DoD programs.
• Regular triennial reviews could help Congress and DoD spot industry trends that weaken the defense supply chain.

Opponents' View#

• One concern is that the bill does not clearly explain whether DoD can block or require changes to a transaction, or how disputes would be resolved.
• The added review step could delay transactions and increase compliance costs for investors and target companies.
• The definition of “major defense supplier” is broad (including firms that “could supply” goods or tech), which may create uncertainty about which deals must be reported.
• The bill may duplicate or overlap with existing antitrust and national security review processes, raising questions about how agencies will coordinate.
• Conducting timely, high-quality reviews and triennial studies would require DoD staff and resources; the bill does not specify funding or staffing changes.