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Merger and Acquisitions

Mergers and acquisitions change the ownership or control of businesses and assets through a coordinated process of strategy, valuation, diligence, financing, negotiation and execution.

Entry type: Knowledge article

Field: Corporate Transactions

Last reviewed: 24 August 2026

Definition

Mergers and acquisitions (M&A) comprise transactions in which companies, business units or assets are combined, purchased, sold or transferred. The term covers acquisitions, mergers, takeovers, divestitures and related changes of corporate control.

Overview

Companies pursue M&A to enter markets, acquire capabilities, consolidate industries, reshape portfolios or transfer ownership. Sellers may seek liquidity, strategic focus, succession or relief from financial pressure. The transaction itself does not create value automatically: price, financing, risk allocation and post-closing execution determine whether the strategic thesis is realized.

Transaction forms

Buy-side

  • Target screening
  • Valuation and diligence
  • Financing and negotiation
  • Integration planning

Sell-side

  • Sale preparation
  • Buyer outreach
  • Competitive process
  • Separation planning

Other structures

  • Mergers and schemes
  • Joint ventures
  • Minority investments
  • Asset and carve-out deals

Deal lifecycle

  1. Strategy: establish the transaction rationale and alternatives.
  2. Preparation: identify counterparties, valuation range, process and readiness.
  3. Diligence: test financial, commercial, legal, operational and technology assumptions.
  4. Structuring and negotiation: agree price, financing, conditions, protections and risk allocation.
  5. Approval and closing: secure corporate, financing and regulatory approvals and complete transfer.
  6. Integration or separation: deliver synergies, continuity and the planned operating model.

Advisers and participants

ParticipantPrincipal contributionCentral question
Corporate leadership and boardStrategy, governance and approvalShould the transaction proceed?
Financial adviserValuation, process and negotiationHow should it be priced and executed?
Legal counselStructure, documentation and regulatory workHow are rights and risks allocated?
Diligence specialistsIndependent testing of assumptionsWhat could change value or feasibility?
Integration teamPost-closing deliveryHow will the thesis become operating results?

Sources and further reading

View sources and editorial notes
  • OECD, corporate governance and competition publications.
  • International Valuation Standards Council, International Valuation Standards.
  • Relevant national securities, competition and company-law authorities.

Editorial note: Transaction structures and approval requirements vary by jurisdiction. This entry describes the general M&A system and is not legal or investment advice.