TL;DR: A merger or acquisition typically unfolds across seven stages — from quiet target screening to public closing — spanning three to twelve months. Each stage has its own documents, its own power dynamics, and its own failure modes. Here is what actually happens inside each one.
Why M&A Is Harder Than It Looks From the Outside
When a deal is announced, the headline focuses on the price. But the public announcement is usually the midpoint of a long process, not the beginning. By the time shareholders hear about an acquisition, lawyers, bankers, and executives have typically been working together for weeks — sometimes months. Understanding the pipeline helps investors read the signals markets send at each milestone and assess whether a deal is likely to close.
Stage 1: Strategic Targeting — Before Anyone Knows
Most acquisitions begin quietly inside a company’s corporate development function. A deal team, often supported by investment bankers, builds a target list based on strategic fit: product adjacency, geographic expansion, technology access, or eliminating a competitor before it scales. Initial contact is usually informal — a phone call between CEOs or an introduction arranged through a shared banker.
Targets that engage sign a non-disclosure agreement (NDA) before sharing any material information. The NDA typically includes a standstill provision, which prevents the potential acquirer from accumulating the target’s shares or making hostile overtures for a set period — typically 12 to 18 months. This gives the target’s board room to run a controlled, orderly process.
Stage 2: The Letter of Intent (LOI)
If early discussions look promising, the acquirer submits a Letter of Intent (LOI) — sometimes called an indicative bid or term sheet. The LOI states a proposed price (expressed as price per share or an enterprise value multiple), deal structure (all-cash, all-stock, or a mix), and the major conditions the acquirer needs before signing a binding agreement.
Critical nuance: The LOI is generally non-binding on price, but it often includes a binding exclusivity clause — also called a no-shop provision — preventing the target from negotiating with other bidders for a fixed window, typically 30 to 60 days. That exclusivity period is the acquirer’s opportunity to complete diligence before committing real money.
Think of the LOI as a provisional handshake: both sides agree in principle, but the final grip depends entirely on what due diligence surfaces.
Stage 3: Due Diligence — Where Deals Quietly Die
Due diligence is the structured audit of everything the seller claimed to be true. The acquirer’s team — lawyers, accountants, investment bankers, and operational specialists — methodically reviews the target’s financial statements, material contracts, intellectual property, litigation history, employee agreements, real estate leases, environmental liabilities, and any off-balance-sheet obligations.
Modern due diligence happens almost entirely inside a virtual data room (VDR) — a secure online repository where the target uploads documents in response to formal request lists. A large deal can generate thousands of individual document requests across 15 to 30 parallel workstreams.
Due diligence kills more deals than any other stage — it just does so silently. A deal that “fell apart for strategic reasons” is often one where diligence found something the acquirer could not price or fix: a single customer representing 60% of revenue, a patent portfolio built on licensed IP, or a government contract that cannot legally be assigned to the buyer.
Stage 4: The Definitive Agreement
If diligence clears, lawyers draft the Definitive Merger Agreement (DMA) — the binding contract that governs the transaction. DMAs for large public deals typically run 100 to 300 pages. The critical provisions are:
- Representations and warranties — factual statements each party makes about itself (“we have no undisclosed material litigation”). Breaching a rep gives the other side grounds to walk or seek indemnification.
- Covenants — what each party must and must not do between signing and close. The target typically cannot make large acquisitions, pay special dividends, or make significant hiring changes without the acquirer’s consent.
- Conditions to close — what must remain true for the deal to proceed: regulatory approvals obtained, no material adverse change, shareholder vote passed.
- Break-up fees — the penalty paid if a party terminates without cause. For public company acquisitions, both the target’s termination fee and the acquirer’s reverse termination fee are typically set at 2% to 4% of total deal value. These fees discourage capricious walk-aways without making exit prohibitively expensive.
- Material Adverse Change (MAC) clause — the acquirer’s escape hatch if the target’s business fundamentally deteriorates before close. U.S. courts apply MAC clauses narrowly: short-term earnings misses, industry-wide downturns, and even broad macroeconomic shocks have generally not been found to constitute a MAC.
The DMA is executed by both boards after each completes its own legal process. The public announcement — and the target’s stock price jump — happens the moment ink is dry.
Stage 5: Regulatory Review
Signed does not mean done. Large deals must clear antitrust and, in some cases, national security hurdles before closing.
Hart-Scott-Rodino (HSR) Filing
Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, transactions above size thresholds set annually by the FTC must be pre-notified to both the Federal Trade Commission (FTC) and the Department of Justice (DOJ) Antitrust Division before closing. Both agencies receive the filing; one takes jurisdiction based on industry expertise. The initial HSR waiting period is 30 calendar days for most transactions (15 days for all-cash tender offers). Either agency may issue a Second Request — a sweeping demand for documents and data — which restarts the clock and can add six months or more to the review. See: FTC Premerger Notification Program.
CFIUS (Foreign Investment Review)
Deals involving a non-U.S. acquirer of a U.S. business may require review by the Committee on Foreign Investment in the United States (CFIUS), an interagency committee chaired by the U.S. Treasury. CFIUS assesses whether the transaction creates a national security risk. The initial review runs 30 days, extendable into a full 45-day investigation. If CFIUS cannot clear the deal on acceptable terms, it escalates to the President, who can block or unwind the transaction. See: U.S. Treasury CFIUS.
Sector-Specific Regulators
Depending on the industry, additional approvals may be required: the FCC for telecom and broadcast deals, FERC for energy and utility mergers, state insurance departments for insurance carriers, banking regulators for bank acquisitions, and the EU Directorate-General for Competition (DG COMP) for cross-border transactions with significant European revenues. Each regulator runs on its own timetable and applies its own substantive standard.
Stage 6: The Shareholder Vote
Most acquisitions of U.S. public companies require approval from the target’s shareholders, and sometimes from the acquirer’s shareholders if a large amount of new stock is being issued. The target files a proxy statement (SEC Form DEF 14A) — a public document explaining the deal terms, the board’s recommendation, and the investment bank’s fairness opinion certifying the price is fair from a financial standpoint. Shareholders vote at a special meeting typically scheduled four to eight weeks after the proxy is mailed. See: SEC proxy requirements.
Institutional proxy advisors — principally ISS (Institutional Shareholder Services) and Glass Lewis — publish vote recommendations that carry significant influence with large institutional shareholders. An adverse ISS recommendation on a deal with a thin expected approval margin can swing the outcome.
Stage 7: Closing and the Integration Clock Starts
Once all regulatory clearances are in hand and shareholders have voted in favor, the deal closes: cash or stock consideration is transferred, the target’s shares are cancelled, and the entity merges into — or becomes a wholly-owned subsidiary of — the acquirer. The integration management office (IMO), which should have been staffing and planning for months, moves into full execution mode on Day 1.
Integration is where deals succeed or fail. Cost synergies — headcount reductions, real-estate consolidation, vendor renegotiations — are more predictable than revenue synergies, which require sales teams, customers, and product roadmaps to actually converge. Companies that begin integration planning during due diligence consistently outperform those that treat it as an afterthought.
Where Deals Break Down After Announcement
Between announcement and close, deals fail for several recurring reasons:
- Regulatory block — agency challenge, required divestitures that make the deal uneconomical, or a CFIUS veto
- MAC trigger — the target’s business materially deteriorates and the acquirer argues the closing condition is not satisfied
- Financing failure — particularly relevant for leveraged buyouts where committed debt financing contains market “flex” provisions
- Competing bid — a rival acquirer emerges, raises the price, and the original bidder cannot match without destroying its own return
- Shareholder rejection — target shareholders vote against the deal, often catalyzed by an activist holding a blocking stake
- Reverse break-up fee paid — the acquirer elects to pay the contractual penalty rather than complete a deal that no longer clears its internal return hurdle
What Buyers Actually Pay: The Acquisition Premium
Acquirers pay more than the current market price because shareholders have no reason to tender their shares unless they receive a share of the combined value being created. The gap between the offer price and the target’s unaffected stock price is called the acquisition premium. Measured against the target’s share price in the 30 days before announcement, premiums for U.S. public-company transactions have historically averaged in the 20% to 35% range, with strategic acquirers in competitive or fast-moving sectors often paying 40% to 60% or more. Premium size reflects how competitive the bidding process was, how critical the target’s assets are to the acquirer’s strategy, and how much of the expected synergy value the acquirer is willing to share upfront with selling shareholders.
M&A Process at a Glance
| Stage | Key Document | Who Leads | Typical Duration | Common Deal-Breaker |
|---|---|---|---|---|
| 1. Target Screening | NDA / Standstill | Corp. Dev. + Bankers | 1–12 months | Strategic misfit / price gap |
| 2. Letter of Intent | LOI / Term Sheet | CEO + M&A Bankers | 1–3 weeks | Valuation disagreement |
| 3. Due Diligence | VDR / Request Lists | Lawyers + Accountants | 4–12 weeks | Undisclosed liability |
| 4. Definitive Agreement | Merger Agreement (DMA) | M&A Counsel | 2–4 weeks | MAC clause / reps breach |
| 5. Regulatory Review | HSR Filing / CFIUS Notice | Antitrust Lawyers | 8–24 weeks | Agency challenge / Second Request |
| 6. Shareholder Vote | Proxy (DEF 14A) | IR + Proxy Advisors | 4–8 weeks | ISS/Glass Lewis adverse rec. |
| 7. Close & Integration | Closing Checklist / IMO Plan | Integration Team | 1–4 weeks | Financing fall-through |
Related Concepts to Learn Next
- How an IPO actually works — the other major path to the public markets
- Leveraged buyouts (LBOs) — how private equity uses debt to finance acquisitions and targets IRR through financial engineering
- Hostile takeovers and poison pills — what happens when the target’s board fights back against an unsolicited bid
- Earnouts — how acquirers defer part of the purchase price to manage uncertainty about the target’s future performance
- Beta, Alpha, and the CAPM — understanding market risk helps explain deal premiums
Sources
- FTC Premerger Notification Program (HSR Act) — authoritative source for HSR filing requirements, thresholds, and waiting periods
- U.S. Treasury: Committee on Foreign Investment in the United States (CFIUS)
- SEC: Proxy Statement Requirements (Form DEF 14A)
- DOJ/FTC Horizontal Merger Guidelines
- Harvard Law School Forum on Corporate Governance — primary research source for breakup fee norms and MAC clause jurisprudence
Disclosure: This article was produced with AI assistance and reviewed before publication. It is for informational purposes only and is not investment advice.