The M&A Deal Process End to End

Every merger a trader reads about in the news has already been moving for months, often years, before the announcement that made headlines. The process runs through a recognizable sequence of stages, and knowing which stage a deal is in tells you what can still go wrong — the risks at the start (will a buyer even be found) are completely different from the risks at the end (will regulators clear it).

The sequence

1. Strategic review. The target's board and management, often with a financial advisor, decide whether to explore a sale, and whether to run a targeted approach to one buyer or a broader auction to several.
2. Marketing and due diligence. Interested buyers sign confidentiality agreements, review financials, operations, and legal exposure, and submit indications of interest, then binding bids.
3. Negotiation and signing. The winning bidder and target negotiate price, structure (cash or stock), and the merger agreement's terms — including break fees and conditions to closing — then sign and publicly announce the deal.
4. Shareholder and regulatory approval. Target shareholders vote to approve the deal; antitrust regulators and, for cross-border deals, foreign-investment authorities review it, which can take anywhere from weeks to well over a year.
5. Closing. Once all conditions are satisfied, the deal closes, consideration is paid, and the target is legally absorbed into the acquirer.

A simple domestic deal with no antitrust concern can close in two to three months from announcement. A large deal facing a serious regulatory review can take well over a year, and some are abandoned before ever reaching this stage.

Stage	Typical duration	Main risk while here
Strategic review	weeks to months	deal never gets to market
Marketing / diligence	2–6 months	no acceptable bid emerges
Negotiation / signing	weeks	price or terms fall apart
Approval (shareholder + regulatory)	1–12+ months	vote fails, or regulator blocks or delays
Closing	days after conditions clear	financing falls through

Worked example

A deal is announced at $50 per share in cash, versus a pre-announcement price of $40. The stock immediately trades up to $48, not the full $50, because the market is pricing in the time value of waiting for closing and some probability the deal doesn't close at all.

A merger arbitrageur buying at $48 is underwriting the risk across stages 4 and 5 specifically — the earlier stages are already resolved by the time a deal is public. If the deal closes in six months as expected, the $2 gap converges to zero and the arbitrageur earns $2 per share, an annualized return that reflects mostly regulatory and shareholder-vote risk, not business risk, since the price itself is fixed.

What this means in practice

Reading a deal announcement for the conditions to closing — is there a financing contingency, an antitrust condition, a shareholder vote required — tells you which stage risks are still live and how long the remaining process is likely to take. This is the whole basis of Merger Arbitrage as a strategy: it isolates deal-completion risk from general market risk by only being exposed to whether this specific transaction gets from signing to closing.