Mergers and Acquisitions

Mergers and acquisitions (M&A) are transactions in which companies combine or one company buys another. Deals can reshape industries, create value through synergies or destroy value through overpayment. For traders, M&A announcements produce some of the largest single day moves in stocks, and the period between announcement and completion creates opportunities in merger arbitrage. Understanding how deals are structured and approved helps traders assess the risks.

Types of deals#

Payment methods#

In stock deals, the value received by target shareholders changes with the acquirer's share price.

The takeover premium#

Acquirers usually pay a premium over the target's pre announcement price, often 20% to 40%, to persuade shareholders to sell.

Synergies#

Acquirers justify premiums with expected synergies:

• Cost synergies: combining operations, cutting duplicate costs.
• Revenue synergies: cross selling, broader distribution.
• Financial synergies: tax benefits, cheaper financing.

Cost synergies are usually more reliable than revenue synergies. Many studies have found that acquirers' shareholders, on average, gain little or lose from large acquisitions, while target shareholders capture most of the value through the premium. See Capital Allocation and Management.

The approval process#

1. Negotiation and agreement between boards.
2. Announcement with terms, timeline and conditions.
3. Regulatory review: antitrust authorities (such as the US Federal Trade Commission and Department of Justice, the European Commission and the UK Competition and Markets Authority) and sometimes national security reviews.
4. Shareholder votes, usually for the target and sometimes for the acquirer.
5. Financing for cash deals.
6. Closing, often 3 to 12 months after announcement, longer for complex deals.

Deals can fail at any stage. High profile blocked or abandoned deals include Nvidia's planned purchase of Arm (abandoned in 2022 after regulatory opposition).

How stocks react#

Accounting effects#

Acquisitions create goodwill when the price exceeds the fair value of net assets. If the deal underperforms, goodwill may be written down. See Goodwill and Intangible Assets.

Trading M&A#

• Merger arbitrage: buy the target below the offer price, betting on completion. See Arbitrage Strategies.
• Event driven strategies around rumours, approvals and votes. See Event-Driven Trading.
• Options: implied volatility usually collapses in targets after a cash deal is announced.

Frequently asked questions#

What is the difference between a merger and an acquisition?#

In an acquisition, one company buys another; in a merger, two companies combine, often forming a new entity, though the terms are frequently used interchangeably.

Why do target stocks trade below the offer price?#

Because there is a risk the deal fails and a time cost until it closes, so investors demand a discount.

Do acquisitions create value?#

Target shareholders usually benefit through premiums, but research shows acquirers' shareholders often gain little or lose on average, especially in large deals.

Next, learn about companies separating businesses in Spin-Offs.