Advanced Financial Management · Regulatory framework and processes

Takeover Regulation and the City Code for ACCA AFM

Updated 11 October 2026

Takeover regulation protects target shareholders and keeps bids fair and orderly. In the UK, the City Code on Takeovers and Mergers, enforced by the Takeover Panel, sets general principles and rules. Its best-known rule is the mandatory bid: buying 30% or more of voting rights forces an offer to all shareholders at no less than the highest recent price.

Understand Takeover Regulation and the City Code

A takeover is a bid for control of a company. The target's shareholders must decide whether to sell. Without rules, a bidder could pressure some shareholders, give better terms to some than others, or leave minority holders stuck in a company with a new controller. Takeover regulation exists to stop this.

In the UK, the main source is the City Code on Takeovers and Mergers. It applies to offers for UK public companies. It is not mainly law made in Parliament. It is a set of rules written and applied by the Takeover Panel. The Panel has statutory backing, so its rulings carry real force. It acts quickly, often during a live bid, and its decisions can be challenged only in limited ways.

The Code is built on general principles. These are the spirit of the Code and sit above the detailed rules. In broad terms they say:

All holders of the same class of shares must be treated equally. If control is acquired, the other holders must be protected.
Shareholders need enough time and information to make a properly informed decision.
The target board must act in the interests of the company as a whole and must not deny shareholders the chance to decide on the bid.
There must be no false markets in the shares of the target or the bidder.
A bidder must announce an offer only after being sure it can pay in full, and must act reasonably in the process.
The target must not be hindered for longer than is reasonable by a bid.

The detailed rules put these principles into practice. The best-known is the mandatory bid rule. If a person, together with those acting in concert with them, acquires interests in shares carrying 30% or more of the voting rights, they must make an offer to all other holders. The offer must be in cash or accompanied by a cash alternative. The price must be at least the highest price paid by the bidder, or those acting with them, in the 12 months before the announcement of the offer, and any purchases after that during the offer period. The idea is that anyone gaining effective control must give the other holders a fair exit.

Other rules cover secrecy before an announcement, disclosure of dealings during the offer period, timetable limits, and restrictions on the target board. For example, once a bid is imminent, the target board generally cannot take frustrating action, such as issuing shares or selling major assets, without shareholder approval. In AFM, you use this knowledge to advise a client on how a bid must be run and how a defence is limited.

Key rules to remember

Mandatory bid trigger: Interests in shares carrying ≥ 30% of voting rights (with concert parties) → offer to all other holders; There are two triggers. (1) A person, with those acting in concert, acquires interests in shares carrying 30% or more of the voting rights. (2) A person, with concert parties, already holding 30% or more but not more than 50% of the voting rights acquires any further interest in shares carrying voting rights. Either one requires a mandatory offer.
Mandatory bid price: Offer price ≥ highest price paid by the bidder (and concert parties) in the 12 months before the announcement of the offer, and in any purchases after that during the offer period; The offer must be in cash, or have a cash alternative, for a mandatory bid.
Control by simple majority: Over 50% of voting rights = control of ordinary resolutions; Used to explain why 30% is a lower trigger: effective influence arrives before a majority.
Special resolution majority: 75% of votes cast needed for a special resolution; A scheme of arrangement is different: it needs approval by a majority in number representing 75% in value of those voting. Compulsory acquisition uses a separate 90% test (see squeeze-out). Check the figures given in the question.
Squeeze-out: Bidder acquires ≥ 90% in value of the shares to which the offer relates, and (where those shares carry voting rights) ≥ 90% of the voting rights carried by those shares → may compulsorily buy the rest; Under UK company law (Companies Act 2006). The bidder must give notice within three months after the end of the offer period (the end of the acceptance period). Minority holders can also require the bidder to buy them out (sell-out), by asking within three months after the end of the offer period.

How to solve Takeover Regulation and the City Code questions

Use this method for any written question on takeover regulation, whether it is a short requirement or part of a larger bid case.

1Read the requirement and note whether it asks for principles, a specific rule, the Panel's role, or advice on a given bid.
2Identify the facts in the scenario: who holds what percentage of voting rights, who is acting in concert, prices paid and dates.
3Name the relevant principle or rule. Use the 30% threshold, the highest price paid in the 12 months before the announcement of the offer and equal treatment where they apply.
4Apply it to the numbers. Add holdings of concert parties, compare the total with 30%, and work out the minimum offer price.
5State the consequence: must the bidder make an offer, at what minimum price, and in what form (cash or cash alternative)?
6Explain who is protected and why, linking to shareholders, the target board and the market.
7Give a clear recommendation or conclusion and note any limits, such as limits on defensive action by the target board.
8Check the professional skills marks: use a clear structure, a commercial point and a balanced view.

Quickest way: Threshold-first check

When to use it: Use when the question gives share percentages and prices and asks whether a bid is required.

Add the bidder's holding to concert party holdings.
Compare the total with 30%. Below it, no mandatory bid. At or above it, the offer is required.
Find the highest price paid in the last 12 months. That is the floor for the offer price.
State that the offer goes to all other holders and must be in cash or have a cash alternative.
Add one line on the principle behind it: equal treatment and protection of minorities.

Common mistakes in Takeover Regulation and the City Code

Saying the mandatory bid is triggered by more than 30% only.
Students remember '30%' but not the exact wording.
Fix: Write 'acquires 30% or more of the voting rights'. Also cover concert parties.
Ignoring shares held by concert parties.
Students look only at the named bidder's holding.
Fix: Always check whether the scenario mentions related parties acting together and add their holdings.
Using the latest price paid, not the highest price in the previous 12 months, as the minimum offer.
The most recent purchase feels like the relevant one.
Fix: Scan all purchases in the 12 months and pick the highest.
Listing the general principles from memory without applying them to the scenario.
Students treat it as a recall topic.
Fix: Pick the two or three principles that fit the facts and explain how each is breached or upheld.
Describing the Takeover Panel as a court or as part of government.
Confusion about who regulates bids.
Fix: Say it is the body that writes and enforces the Code, acts quickly, and has statutory backing.
Telling the target board it can freely use any defence.
Students focus on defence tactics and forget the Code's limits.
Fix: State that frustrating action generally needs shareholder approval once a bid is imminent or underway.

Worked examples

Example 1

Alpha plc already holds 22% of the voting shares in Beta plc. Gamma Ltd, which is acting in concert with Alpha, holds 5%. Alpha then buys a further 4% at $3.10 per share. All the purchases described were made within the 12 months before the offer was announced: Alpha's earlier purchases were at $2.80 and $3.00 per share, and Gamma bought its 5% at $2.90 per share. Advise whether a mandatory bid is required and the minimum price.

Show the solution

Alpha's holding before the new purchase: 22%. After buying the further 4%: 22% + 4% = 26%.
Gamma is acting in concert with Alpha, so its holding counts: 26% + 5% = 31%.
31% is at or above the 30% threshold, so the mandatory bid rule is triggered.
Minimum price is the highest price paid by Alpha and its concert parties in the 12 months before the announcement of the offer. All purchases fall within that window. Alpha paid $2.80, $3.00 and $3.10. Gamma paid $2.90. The highest price paid by any of them is $3.10.
The offer must go to all other holders of Beta's voting shares and must be in cash or have a cash alternative.
The reason is equal treatment: other holders must be given a fair exit when control passes.

Answer: Yes. Combined holdings are 31%, above 30%, so Alpha must make a cash offer (or with a cash alternative) to all other holders at not less than $3.10 per share.

Example 2

A bidder has announced an offer for Delta plc. The Delta board wants to issue new shares to a friendly investor to make the bid harder, without telling shareholders. Explain the relevant Code principles and advise the board.

Show the solution

Identify the facts: a bid has been announced and the board wants to issue shares as a defence.
Relevant principle: the target board must act in the interests of the company as a whole and must not deny shareholders the chance to decide on the bid.
Relevant rule: during a bid, the board generally cannot take frustrating action, such as issuing shares, without shareholder approval.
Equal treatment and informed decisions: issuing shares to a friendly party without telling shareholders gives that party an advantage and withholds information.
Role of the Panel: the Panel could rule against the action and require it to be reversed or put to shareholders.
Advice: do not issue the shares unilaterally. If the board believes the bid undervalues the company, make the case to shareholders, seek a higher offer or seek a better alternative, and obtain shareholder approval for any action that could frustrate the bid.
Professional point: the board's duty is to shareholders as a whole, not to protect its own positions.

Answer: The board should not issue the shares without shareholder approval. Doing so would breach the principle that shareholders must be allowed to decide on the bid. The board should instead argue its case on value and seek shareholder approval for any defensive step.

Exam tips

Link every rule to the principle behind it. Examiners reward the reason (fair treatment, informed decision) not only the number.
In bid scenarios, always check concert parties and the 12-month price window before concluding on the mandatory bid.
Keep the answer applied. Use the company names and figures in the scenario.
Where the question is UK-specific, state clearly that the City Code applies to UK public companies and do not assume other countries have identical rules.
Add a short professional judgement line, such as the effect on minority shareholders or the board's duty.

Practice questions from Regulatory framework and processes

Takeover Regulation and the City Code: frequently asked questions

What are the general principles of the City Code on Takeovers?

They cover equal treatment of shareholders of the same class, enough time and information for a properly informed decision, and the target board acting in the interests of the company as a whole. They also cover no false markets, an offeror being certain it can pay, and the target not being hindered longer than reasonable. Learn them as ideas and apply them to the scenario.

What is the role of the Takeover Panel?

The Takeover Panel writes, interprets and enforces the City Code. It rules quickly during live bids and can require parties to change their conduct. It has statutory backing, which gives its decisions real force.

How does the mandatory bid rule at 30% work?

If a person, together with those acting in concert, acquires shares carrying 30% or more of the voting rights, they must make an offer to all other holders. The price must be at least the highest paid in the previous 12 months, and the offer must be in cash or have a cash alternative.

Do I need to know the City Code in detail for AFM?

You need the principles, the role of the Panel, the mandatory bid rule and the main limits on the target board. The exam tests whether you can apply them to a bid scenario and advise, not recite the whole Code.