M&A Glossary: Key Terms and Definitions for Every Stage of a Deal

In this glossary:

• People and Roles in an M&A Transaction
• Core Deal Documents
• Financial and Valuation Terms
• Legal and Closing Terms
• Frequently Asked Questions

People and Roles in an M&A Transaction

Knowing who does what and when is one of the fastest ways to orient yourself in a live deal.

Acquirer (Also called the buyer) The person or company purchasing the target. On the buy side, the acquirer sets the strategy, conducting due diligence, negotiating terms, and owning the integration. Acquirer and target often remain distinct throughout the M&A process, even after a deal is announced.

Target Company The company the acquirer wants to buy. The target may or may not be actively for sale. Proactive acquirers often approach companies that haven't listed themselves for sale.

Head of Corporate Development The internal executive responsible for running M&A on behalf of the acquirer. They own the deal strategy and lead diligence coordination. They manage relationships with bankers, lawyers, and the target's leadership team. In smaller organizations, this role may sit inside the CFO's office.

Investment Banker Represents the buyer or seller. On the sell side, they run the auction or negotiation process and manage the flow of confidential information. On the buy side, they help identify targets and structure deals. Bankers typically earn a percentage of the transaction value (success fee) if the deal closes.

Deal Lead The person driving the day-to-day transaction. On the buy side, this is often the Head of Corporate Development or a senior member of the deal team. They coordinates diligence workstreams, manage the timeline, and keep stakeholders aligned.

Deal Sponsor (Business Sponsor) The internal champion who owns the strategic case for the acquisition. They present the investment rationale to senior leadership, secure internal approvals, and are accountable for integration outcomes. If the deal creates problems post-close, they the first person who must explain why.

Executive Sponsor A C-suite leader who has formally approved the transaction. Every deal needs an executive sponsor before it can move through internal governance. This person signals that the acquisition has top-level commitment and owns accountability alongside the sponsor.

Integration Lead The person managing the work of combining the two businesses post-close. In highly acquisitive companies, this is a dedicated role. In most organizations, it falls to a senior leader from the business unit that will absorb the acquired company. For more on how integration is structured, see our guide to M&A integration.

Steering Committee: The M&A steering committee is the governance body overseeing integration. It typically includes the deal sponsor, the integration lead, functional leaders from both companies, and relevant subject-matter experts. It resolves decisions that are too consequential for the integration team to handle alone.

Shareholder Own equity stakes in the company. In an acquisition, target shareholders are typically the ones who receive the purchase price, either in cash, stock, or a combination of both. Not all investors are shareholders; some hold debt instruments or options that don't carry direct ownership.

Stakeholder Anyone with an interest in the outcome of the transaction, like employees, customers, suppliers, regulators, and the community, in addition to shareholders. Managing stakeholder communication is a core part of deal execution. See our guide to building an M&A communication plan.

Board of Directors: The governing body that represents shareholders and approves major corporate decisions, including M&A transactions. They review the strategic rationale, approve the deal, and, in a sell-side process, evaluateswhether the acquirer's offer reflects the company's value.

Core Deal Documents

These are the documents you'll encounter most often in a transaction, roughly in the order they appear during the deal process.

Investment Thesis Articulates why the company should pursue a given type of acquisition. It defines the strategic gap the deal addresses, the criteria a target needs to meet, and the expected return on investment. An approved investment thesis authorizes corporate development to start sourcing targets.

Deal Thesis The deal thesis is the target-specific version of the investment thesis. It documents why this company, at this price, in this structure, creates value. A well-constructed deal thesis also defines kill criteria, or the conditions under which the team should walk. Deals without a clear deal thesis tend to move forward when they should stop.

Non-Disclosure Agreement (NDA) A legally binding contract both parties sign before sharing sensitive information. In M&A, NDAs are standard prior tomeaningful diligence. It defines what can be shared, who can see it, and how long the confidentiality obligation holds. Sophisticated targets use NDAs to limit the buyer's ability to poach employees.

Confidential Information Memorandum (CIM) The document a sell-side banker prepares to introduce the target to prospective buyers. It contains an overview of the business, including financials, market position, growth strategy, and management team, and is designed to generate initial bids. Buyers should read CIMs with the understanding that they're marketing documents.

Indication of Interest (IOI) An early, non-binding expression of interest submitted by a buyer after reviewing the CIM. It signals intent to participate in an auction and typically includes a preliminary valuation range. IOIs are screened by the seller's banker before granting access to more detailed information and management meetings.

Letter of Intent (LOI) The buyer's formal offer. It sets out the proposed purchase price, deal structure, diligence timeline, exclusivity period, and key conditions. While mostly non-binding, the LOI locks in the commercial terms that will anchor the definitive agreement. Negotiating the LOI carefully matters because it establishes the framework on which everything else is built.

Definitive Purchase Agreement (DPA) The binding legal contract that transfers ownership. It supersedes all prior documents, including the LOI, and contains every agreed term and condition. That means price adjustments, representations and warranties, covenants, closing conditions, and post-closing obligations. This is the document both parties sign to close the deal.

Go-to-Market (GTM) Strategy Outlines how the combined company will approach customers, expand into new segments, or cross-sell acquired products. GTM planning is especially relevant in integration, when the acquirer needs to decide which sales motion and customer messaging to preserve.

Financial and Valuation Terms

These terms appear throughout diligence and valuation — understanding them prevents expensive misalignments during negotiation.

EBITDA Stands for Earnings Before Interest, Taxes, Depreciation, and Amortization. It's the most commonly used proxy for a company's operating profitability in M&A, because it strips out financing structure and non-cash accounting effects to focus on underlying business performance. Most M&A purchase prices are expressed as a multiple of EBITDA (e.g., "10x EBITDA").

Working Capital The difference between a company's current assets (cash, receivables, inventory) and current liabilities (payables, accrued expenses). Working capital is critical because deals typically include a working capital target, or the minimum amount the seller must deliver at close. Shortfalls result in a post-close price adjustment paid by the seller.

Earn-Out A portion of the purchase price is contingent on the acquired company hitting post-close performance milestones (usually revenue or EBITDA targets) over one to three years. Earn-outs bridge valuation gaps when the buyer and seller disagree on future performance. They also create post-close risk. Defining, measuring, and enforcing earn-out metrics is one of the most disputed areas in M&A.

Escrow A portion of the purchase price held back by a neutral third party after close — typically to cover the seller's indemnification obligations for a defined period. If representations and warranties violations surface post-close, the buyer can draw on the escrow account. Escrow amounts typically range from 10–20% of deal value and are held for 12–24 months.

Purchase Price Adjustment True up the deal price based on the actual financial condition of the business at close versus what was modeled. The most common adjustment is working capital. Other adjustments may be tied to net debt or cash balances. These are settled in the weeks following close based on a closing balance sheet audit.

Legal and Closing Terms

Representations (Reps) and Warranties The factual declarations each party makes to the other in the definitive agreement. The seller represents facts about the company's financial condition, legal standing, IP ownership, and more. The buyer warrants that it has the authority and funding to close the deal. Reps and warranties survive closing, and if they turn out to be false, the party who made them is liable for damages.

Indemnification The mechanism by which one party compensates the other for losses arising from a reps and warranties breach. If the seller represented that the company had no pending litigation, and it did, the seller indemnifies the buyer for any resulting damages. Indemnification obligations are typically capped at a percentage of the purchase price and limited to a specific time window.

Exclusivity (Sometimes called "lock-up") is a provision in the LOI granting the buyer a defined period (typically 30 to 90 days) during which the seller cannot solicit or entertain other offers. Exclusivity signals mutual commitment to a deal, gives the buyer time to complete due diligence, and prevents the seller from running a parallel auction process.

Data Room The secure repository where the seller organizes and shares confidential documents with the buyer's diligence team. Modern data rooms are virtual (VDRs). They contain financial statements, contracts, IP records, employment agreements, regulatory filings, and anything else a buyer needs for diligence. Data room management signals how organized and prepared a seller is for the deal process.

Non-Compete Prevents the seller, typically the founding management team, from starting or joining a competing business for a defined period after close. In acquisitions where the seller's talent is a key part of the deal value, non-competes protect the acquirer's investment from being undermined by the people who just got paid.

Non-Solicitation Prohibits one party from poaching the other's employees, customers, or suppliers for a period. This often protects the acquirer from the seller using deal access to recruit away key employees or redirect customers to a new venture.

Gun Jumping Illegal coordination between buyer and seller before the deal closes. Antitrust law requires the two companies to continue operating independently until closing conditions are satisfied and regulatory approval is granted. Acting as one entity before close can trigger regulatory penalties and delay or kill the deal.

Antitrust (Competition Review) The regulatory process in which government agencies evaluate whether a proposed acquisition would harm competition in a given market. In the U.S., the FTC and DOJ review large transactions under Hart-Scott-Rodino (HSR) filing requirements. In Europe, the European Commission leads the review. Large horizontal deals face the most scrutiny, and regulators can require divestitures of overlapping business units as a condition of approval.

Breakup Fee (Termination Fee) A contractual payment owed by one party to the other if they walk away from the deal under specified circumstances. Seller-side breakup fees protect the buyer if the target's board recommends a competing offer. Buyer-side breakup fees protect the seller if financing falls through. Fees are typically 3–5% of deal value.

Transition Services Agreement (TSA) A post-close contract where the seller continues providing operational support to the acquired business for a period, including IT systems, HR administration, finance functions, and more. TSAs are common in divestitures and carve-outs, where the acquired unit hasn't historically operated independently and can't be separated cleanly on day one.

Frequently Asked Questions {#faq}

What is an LOI in M&A? An LOI (Letter of Intent) is the buyer's formal, mostly non-binding offer document. It outlines the proposed purchase price, deal structure, exclusivity terms, and diligence timeline. The LOI sets the commercial framework that the definitive agreement will formalize.

What does EBITDA stand for in M&A? EBITDA stands for Earnings Before Interest, Taxes, Depreciation, and Amortization. It's the most common measure of operating profitability used in M&A valuation. Purchase prices are typically expressed as a multiple of EBITDA.

What is a data room in M&A? A data room is the secure virtual repository where the seller organizes and shares confidential documents with the buyer's diligence team. It contains financial records, contracts, IP filings, and other materials needed to complete due diligence.

What is an earn-out in M&A? An earn-out is a portion of the purchase price that is contingent on the acquired business meeting post-close performance targets. Earn-outs are used to bridge valuation gaps between buyer and seller, but they frequently become a source of post-close disputes over how performance is measured.

What is a carve-out in M&A? A carve-out is a type of divestiture in which a parent company sells off a business unit or subsidiary. Unlike a full sale, the parent often retains a partial stake or provides transition services to the carved-out entity. Carve-outs require specific planning because the sold unit typically hasn't operated independently.

What is working capital in M&A? Working capital is current assets minus current liabilities. In a deal, the parties agree to a target working capital amount the seller must deliver at close. If the actual working capital at close is lower than the target, the seller pays the difference back to the buyer as a post-close price adjustment.

What is exclusivity in M&A? Exclusivity is a period, typically granted in the LOI,  during which the seller agrees not to negotiate with other potential buyers while the lead buyer completes diligence. It's a key milestone that signals serious intent from both sides.

What is the difference between reps, warranties, and indemnification? Representations and warranties are the factual claims each party makes about itself in the deal agreement. Indemnification is the legal remedy: if a rep or warranty turns out to be false, the party who made it must compensate the other for resulting losses. They work together — reps define the claims; indemnification defines the consequences of false claims.

Go Deeper

If you're stepping into your first deal and working through unfamiliar terminology quickly, the Intelligence Hub has Standing up a Diligence and Integration Management Office (Kerry Perez, M&A Science Podcast Ep. 145) — a practitioner framework that shows how deal-stage roles and documents connect from diligence into integration, so the terms stop being abstract and start mapping to real decisions.

[Explore the Intelligence Hub]

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