Definition
M&A is an abbreviation for "mergers and acquisitions," used as a collective shorthand for the body of law, practice, and transactions involving the combination of business entities or the purchase of one entity by another. The term encompasses two legally distinct transaction structures:
1. Merger: A transaction in which two or more corporations unite by the transfer of all assets and liabilities to one surviving entity. The surviving corporation continues in existence; the other corporation or corporations are absorbed into it and cease to exist as separate legal persons.
2. Acquisition: A transaction in which one party purchases a controlling interest in, or the assets of, another entity, without necessarily merging the two into a single surviving legal entity. The acquired company may continue to exist as a subsidiary or be dissolved after the purchase.
Common Confusion
MERGER vs. CONSOLIDATION: These terms are often used interchangeably in casual usage, but they are legally distinct. In a merger, one of the constituent corporations survives and absorbs the others. In a consolidation, all of the combining entities surrender their separate existence and a new, unified entity is formed in their place. Historical legal sources, including Black's, are careful to maintain this distinction. Modern practice and many statutes have blurred the line somewhat, but the structural difference remains meaningful in corporate law analysis.
MERGER vs. ACQUISITION: A merger implies a formal statutory combination resulting in one surviving legal entity. An acquisition need not produce that result — an acquirer may purchase a target's stock or assets while the target remains a separate (if wholly owned) entity. The paired term "M&A" groups both structures together for practical and industry purposes, but they trigger different legal procedures, shareholder rights, tax treatments, and regulatory filings.
Why It Matters in Research
The abbreviation M&A is a modern industry and practice term that does not appear in most historical legal dictionaries as a combined entry. Researchers working in historical sources should search separately for "merger" and "acquisition" — and should note that "acquisition" in older corporate law sources more often appears as "purchase of assets" or "stock purchase" rather than as a term of art.
The critical research trap is assuming that statutory merger procedures described in older sources reflect current law. State corporation statutes — particularly Delaware's General Corporation Law — have been substantially revised over the twentieth and twenty-first centuries. The formal requirements for a valid merger (board approval, shareholder vote thresholds, appraisal rights) vary by jurisdiction and by era.
For antitrust research, M&A transactions above certain size thresholds trigger mandatory pre-merger notification requirements under the Hart-Scott-Rodino Antitrust Improvements Act of 1976. This federal overlay is entirely absent from pre-1976 sources and represents a major gap in any historical dictionary treatment of merger law. Researchers connecting Black's merger definition to modern practice must account for this regulatory dimension.
The corpus connection between M&A and antitrust law is substantial. Horizontal mergers (between competitors), vertical mergers (between parties in a supply chain), and conglomerate mergers each receive distinct analytical treatment under federal antitrust doctrine. The encyclopedia entry linked above addresses the Hart-Scott-Rodino framework directly and is the primary corpus resource for the regulatory side of M&A research.
Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) — Supplemental defines merger in the corporate context as the uniting of two or more corporations by transfer of property of all to one, which continues in existence, the others being "swallowed up or merged therein." Black's correctly distinguishes merger from consolidation on the basis of survivorship: in a merger, one entity survives; in a consolidation, all constituent companies surrender their separate existence.
This definition captures the structural core that remains valid today. What historical sources miss entirely is the regulatory environment — antitrust review, shareholder appraisal rights under modern statutes, securities disclosure obligations for public company targets, and the role of federal and state courts in reviewing the fairness of merger consideration. Black's treatment is structurally accurate but institutionally incomplete from a modern research perspective.
No historical dictionary in the Law Mind corpus treats "M&A" as a combined term of art, which reflects the fact that the pairing is a twentieth-century practice convention rather than a classical legal category.
Jurisdictional Note
Merger procedure is primarily governed by state corporation law, making Delaware — as the state of incorporation for a large share of U.S. public companies — the dominant jurisdiction for deal structure and fiduciary duty analysis. Federal law governs antitrust review and, for public companies, securities disclosure. Researchers should not assume that merger mechanics described in any single state's statute apply universally.
Encyclopedia Cross-Reference
Mergers and Acquisitions — Antitrust Considerations in M&A (Hart-Scott-Rodino), The Law Mind Business Organizations & Corporate Law Encyclopedia