Global M&A value is on track to reach roughly $4 trillion in 2026, the strongest level since 2021, while projected deal volume is down about 13% from 2025, according to PwC’s mid-year deals outlook. Investment banks sit at the center of most of these transactions, guiding buyers and sellers through valuation, deal structuring, and negotiation long before a term sheet gets signed.
This guide walks through the M&A process in investment banking stage by stage, breaks down what separates sell-side and buy-side investment banking work, and lays out what banks typically charge, from monthly retainers to success fees tied to deal size. Whether you are a corporate development professional preparing for a sale or an executive evaluating an advisor, you will find the sequence of events, the fee math, and the terminology bankers use every day.
At a glance
- This guide organizes the IB M&A process into seven stages, from initial discussions through closing, with integration planning as a possible follow-on.
- Sell-side bankers represent the seller and work to maximize price and terms; buy-side bankers represent the buyer and work to secure the target at a fair price with manageable risk.
- Most banks charge a retainer plus a success fee. Success fees generally range from roughly 0.5%–1% on billion-dollar deals to 5%–10% or more on transactions under $25 million.
- Bankers lean on comparable company analysis, precedent transactions, and discounted cash flow to set a price range for negotiation.
What is M&A investment banking?
M&A investment banking, also known as merger and acquisition banking, is the division within an investment bank that advises companies on the purchase, sale, or combination of businesses. Rather than trading securities or managing portfolios, this group manages the transaction itself: identifying counterparties, valuing the business, and guiding the deal to close.
An M&A banker’s responsibilities typically include:
- Identifying potential buyers or acquisition targets that fit a client’s strategy
- Building the deal strategy, including structure, timing, and financing considerations
- Providing valuation and financial advice throughout negotiations
- Running or coordinating due diligence workstreams
- Advising on deal terms and negotiation tactics
- Supporting post-merger integration planning
Banks also help clients raise the capital a deal requires, whether through debt or equity issuance, and support the disclosure process, while legal counsel prepares regulatory filings. In the United States, public company M&A transactions may require proxy statements, tender-offer materials, registration statements, or other SEC filings, depending on the transaction structure.
M&A advisory is a core line of business at bulge-bracket banks such as J.P. Morgan, Goldman Sachs, and Morgan Stanley, but their work extends well beyond it. Capital raising, IPO underwriting, and advisory on joint ventures and buyouts round out a typical investment banking division, which is why what is M&A in investment banking is a common point of confusion
M&A is one part of the broader investment banking division’s operations, which also cover capital raising, underwriting, and other advisory services
Key steps of the M&A investment banking process
The investment banking deal process typically unfolds across seven stages, each building on the last, though the order can shift for smaller deals or auction-style processes.
Some practitioners call this the M&A process investment banking teams run daily. The typical acquisition timelines, from engagement letter to close, usually span several months to well over a year.
Let’s explore key steps of the M&A investment process:
The engagement starts with meetings between the bank and the client to define objectives, timeline, and the preferred buyer or seller profile. The bank also sizes up market conditions and recent activity in the client’s sector before outreach begins.
Bankers determine the worth of a target business using comparable company analysis benchmarks. The target is compared against similar public companies. Precedent transaction analysis looks at multiples paid in recent comparable deals, and discounted cash flow modeling projects future cash flows and discounts them to present value.
CFA Institute’s valuation framework groups these into present value, multiplier, and asset-based models, which align closely with how M&A bankers use them in practice. Each method produces a different number, so bankers typically triangulate a range rather than rely on a single figure.
Once a target or buyer is identified, the bank builds out the deal thesis: transaction objectives, financial analysis, a valuation range, proposed structure, and an early view on integration. This stage also sets the deal timeline and identifies which regulatory approvals, financing steps, or shareholder votes will govern how quickly the transaction unfolds.
The buyer’s team, often with the bank’s support, verifies what the seller has represented. Financial due diligence checks historical statements, margins, and cash flow; legal due diligence reviews contracts, litigation history, and compliance exposure; commercial due diligence tests market position, customer concentration, and competitive risk.
Because this stage involves sharing large volumes of sensitive documents, most deals run through an M&A virtual data room rather than email or physical files.
The bank represents its client through price discussions, deal terms, and warranties, while helping resolve gaps that due diligence surfaced. A pitchbook, valuation analyses, and negotiation materials are typically updated at this stage.
Once terms are agreed, the parties sign definitive agreements, the legal documents spelling out price, representations, warranties, and closing conditions. Signing and closing dates often differ, especially when antitrust clearance, foreign investment review, or lender approval is required, which can add weeks or months between the two.
Some investment banks provide limited integration-planning support after signing or closing, but post-merger integration is typically led by the buyer, management, and specialized integration consultants.
Research from Bain & Company, cited in Harvard Business Review, found that 70% of acquisitions in its dataset have succeeded, up from the widely cited 70% failure rate of prior decades. Disciplined post-merger integration also plays a major role.
For a full walkthrough of how each approach works and when to use it, see how bankers value a target company.
Differences between sell-side and buy-side investment banking
Sell-side bankers represent the company being sold and work to maximize the price and terms it receives. Buy-side bankers represent the acquirer and work to secure the target at a fair price with manageable risk. Both roles involve valuation, negotiation, and due diligence, but their objectives, mandates, and client interests differ.
Sell-side and buy-side investment banking work, therefore, looks similar on paper but diverges quickly in practice, as the table below shows.
| Activity | Sell-side role | Buy-side role |
|---|---|---|
| Objective-setting | Defines transaction goals and target valuation range for the seller | Defines acquisition criteria and return targets for the buyer |
| Valuation | Develops an indicative valuation range and flags potential deal-breakers | Values target companies against the buyer’s strategic and financial criteria |
| Counterparty search | Builds a buyer list and runs the marketing process | Identifies and approaches potential sellers or targets |
| Marketing materials | Prepares pitchbooks and marketing materials for buyers | Analyzes market, economic, and sector data to support the buy thesis |
| Due diligence | Prepares the company and manages data-room access for buyer review | Coordinates due diligence with management and specialist advisors |
| Negotiation | Negotiates price and terms on behalf of the seller | Negotiates price and terms on behalf of the buyer |
| Post-deal support | Advises on a smooth handover to the new owner | Supports the integration of the acquired business |
For the complete review scope across every diligence workstream, see what a full due diligence review covers.
What sell-side investment bankers do
Here is what investment bankers handle in a sell-side investment banking process:
- Define the transaction objectives with the business owner and management team
- Review financial statements and other financial records to estimate fair market value and identify potential deal-breakers
- Assess whether the company is ready for sale and recommend steps to improve marketability and shareholder value
- Build a buyer list that may include strategic acquirers and other qualified parties
- Conduct industry research and analyze market trends to position the company effectively
- Prepare the business for due diligence by organizing relevant documents and protecting sensitive information
- Develop marketing materials, including the pitchbook and management presentation, to spark interest
- Negotiate valuation, structure, and terms with prospective buyers
- Support execution through the sale agreement and closing process
- Advise on integration planning so the combined companies can create synergies.
What buy-side investment bankers do
Here is what investment bankers handle on the buy-side of a deal:
- Define the acquisition goals and investment criteria
- Analyze economic conditions, global markets, and M&A trends
- Identify and screen potential acquisition targets
- Contact target companies, explain the proposed transaction, and assess their interest
- Evaluate the target using valuation and merger models
- Conduct due diligence by reviewing financial, commercial, legal, and operational information
- Assess whether the acquisition can strengthen the buyer’s market position or customer base
- Negotiate price, structure, and other terms with the seller
- Support transaction execution and closing
- Help plan how the acquired business will integrate with the existing company.
How much do investment banks charge for their services?
Investment banking fees typically combine two components: a retainer paid regardless of outcome, and a success fee paid on completion. Exact figures vary by advisor, deal size, and complexity, but the ranges below are illustrative.
Retainer fees
A retainer fee compensates the bank for its time, whether or not the deal closes. It serves two purposes: it keeps the banker engaged on the mandate, and it signals that the client is committed to a sale or purchase process rather than testing the market informally.
- Monthly retainer: $5,000–$25,000, though a growing share of advisory firms now charge $16,000 or more per month on larger mandates
- One-time upfront fee: $25,000–$100,000
- Milestone-based fee: $50,000–$150,000, tied to specific deal stages
However, most banks credit some or all of the retainer against the success fee once the deal closes.
Success fees
A success fee is typically payable at closing, or another agreed trigger, calculated as a percentage of the deal’s total value. The percentage scales down as deal size increases, since advisory work does not grow at the same rate as the price tag, and larger deals still produce a meaningful fee even at a lower percentage.
| Deal size range | Typical success fee |
|---|---|
| Under $25 million | 5%–10% |
| $25 million–$100 million | 3%–5% |
| $100 million–$500 million | 1%–3% |
| $500 million–$1 billion | 1%–2% |
| Over $1 billion | 0.5%–1% |
Many firms still apply a version of the Lehman formula, a sliding scale that reduces the percentage as each additional tranche of deal value is added, though modified versions adapted to current deal sizes are now more common than the original scale.
Explore what pushes fees up or down within each range, with our guide on how M&A fees scale by deal size.
FAQ
What role does an investment bank play in a merger or acquisition?
An investment bank advises either the buyer or seller throughout the M&A process. Its advisory services may include valuation analysis, outreach to interested buyers, due diligence coordination, negotiating terms, and structuring the purchase price. On the sell side, bankers may also prepare the confidential information memorandum, manage the non-disclosure agreement process, and help maintain confidentiality.
What is the difference between M&A and investment banking?
M&A is one area of investment banking rather than a separate industry. Investment banking M&A professionals advise companies on acquisitions, sales, and mergers, while investment banking also covers corporate finance, capital markets, leveraged finance, and raising capital. Bankers may work at global institutions, boutique advisory firms, or middle-market specialists, but not every IBD M&A banker focuses on transactions.
What is the typical success fee for an M&A investment bank?
Success fees often range from about 5%–10% of deal value for transactions below $25 million to around 0.5%–1% for deals above $1 billion. The exact rate depends on deal size, complexity, and the scope of the sell-side process. Fees are usually tiered and become payable when the transaction closes successfully.
Key takeaways
- M&A investment banking is a distinct service line focused on advising sell-side transactions, potential acquisitions, and other corporate deals. Investment banking transactions also include underwriting, capital raising, and advisory work.
- The process typically follows seven stages. Valuation, financial modeling, and due diligence have the greatest potential to change deal economics before the parties sign a purchase agreement.
- Buy-side and sell-side bankers use similar skills toward different goals. The seller’s advisor seeks maximum value from prospective buyers, while the buyer’s advisor aims to validate the price and minimize risk.
- Fees usually combine a retainer with a success fee tied to a successful transaction. Rates generally decline as deal value rises, from more than 10% on transactions below $25 million to under 1% on billion-dollar deals, although complexity and the involvement of private equity firms, strategic buyers, or other financial buyers can affect the final fee.
