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Key Facts
- Federal and state: A merger combines companies through a statutory transaction, while an acquisition generally transfers ownership of a business, equity, or assets to a buyer.
- Federal level: Certain transactions must be reported to the FTC and Justice Department under the Hart-Scott-Rodino premerger program and cannot close until the applicable waiting period ends or is terminated.
- Federal level: Merger review asks whether a transaction may substantially lessen competition or tend to create a monopoly.
- State level: Corporate approval, filing, appraisal, and succession rules depend on the governing entity statutes and organizational documents.
Mergers and acquisitions, often shortened to M&A, are transactions that change who owns or controls a business. The phrase covers several legal structures rather than one standard deal.
A merger uses a statute to combine entities, usually leaving one surviving entity or creating a new one. An acquisition can instead involve buying shares, membership interests, operating assets, or an entire business. These structures can produce similar commercial results while assigning liabilities, approvals, taxes, and contracts differently.
How a merger differs from an acquisition
In a statutory merger, the constituent entities follow the corporate or business-entity law that governs them. Delaware corporate law, for example, permits two or more Delaware corporations to merge into one surviving corporation or consolidate into a newly formed corporation under an approved merger agreement.
In a stock acquisition, the buyer purchases ownership interests and the target entity ordinarily remains in existence. In an asset acquisition, the buyer purchases identified assets and may assume identified liabilities. The deal documents define the perimeter, subject to rules that can impose obligations regardless of contractual wording.
The transaction agreement is therefore more than a price term. It commonly addresses representations, covenants, closing conditions, termination rights, risk allocation, and what happens between signing and closing. A letter of intent may record preliminary deal points before the definitive agreement is negotiated.
The process from initial review to closing
M&A work often begins with valuation, confidentiality arrangements, and due diligence. Due diligence is an organized review of matters such as ownership, financial records, contracts, litigation, intellectual property, employment obligations, permits, and regulatory exposure.
Signing and closing are not always simultaneous. After signing, the parties may still need shareholder or member approval, regulatory clearance, third-party consents, financing, and satisfaction or waiver of contractual conditions. Until closing, the businesses generally remain separate legal actors.
Closing completes the agreed transfer or statutory combination. Integration comes afterward and may involve operations, systems, personnel, brands, and governance; it is a business process distinct from the legal moment when ownership changes.
Federal antitrust review
Section 7 of the Clayton Act prohibits acquisitions whose effect may be substantially to lessen competition or tend to create a monopoly. The Justice Department and Federal Trade Commission share federal merger-enforcement responsibility.
The agencies’ 2023 Merger Guidelines describe analytical frameworks used in investigations, including competition between merging firms, coordination risk, potential entry, acquisition patterns, platforms, labor and supplier markets, and partial ownership. The guidelines are nonbinding enforcement guidance; they do not create independent private rights or decide an individual case.
The Hart-Scott-Rodino program requires notification for certain transactions that meet statutory and regulatory tests. Parties to a reportable deal submit information to both agencies and observe the applicable waiting period before closing unless early termination is granted. Reporting thresholds and filing rules change, so deal size alone should not be treated as a permanent shortcut.
Corporate approvals and owner rights
Entity law and organizational documents determine which boards, managers, shareholders, or members must approve a transaction. The required path can vary with entity type, jurisdiction, deal structure, and provisions in charters, bylaws, or operating agreements.
Delaware’s corporate merger statute illustrates the statutory sequence: boards adopt resolutions approving a merger agreement, the agreement states specified terms, and shareholder approval is generally required subject to statutory exceptions. State statutes may also provide appraisal rights, allowing qualifying owners who follow the statutory procedure to seek a judicial determination of the fair value of their shares.
Directors and managers may also owe fiduciary duties when evaluating and implementing a transaction. The content and enforcement of those duties depend on the governing law and the entity’s circumstances.
Why contracts and liabilities matter
A change-of-control clause may require notice or consent even when the contracting entity survives. An anti-assignment clause may matter more directly in an asset transfer. The language and governing law determine whether a particular transaction triggers either provision.
Asset deals are sometimes described as allowing a buyer to select liabilities, but that description is incomplete. Statutes, successor-liability doctrines, fraudulent-transfer rules, employee protections, tax law, and the buyer’s conduct can affect responsibility after closing.
Representations and warranties describe asserted facts about the business. Covenants govern conduct or promised actions, while indemnification provisions allocate specified post-closing losses. These provisions work together with disclosure schedules, liability caps, time limits, insurance, and negotiated exceptions.
A national overview has important limits
No single federal M&A code governs every transaction. Federal antitrust and securities rules can apply alongside state entity, contract, fiduciary-duty, employment, tax, and licensing law. Industry-specific regimes may add another approval layer.
The useful starting point is the transaction’s legal structure: which interests or assets move, which entities survive, what approvals are required, and which obligations remain. Those questions distinguish a merger from an acquisition and reveal which bodies of law control the deal.
