Offer Periods, PUSU Deadlines, and How UK Takeovers Actually Work

The language gives the impression of a rigid, linear process. In reality, it's more controlled than that, but also more nuanced. The framework is tightly regulated, yet much of what happens within it comes down to judgement, timing, and whether a bidder is willing to cross a very clear line.

When a Company Enters an Offer Period

An offer period begins when a company is effectively “in play”. That might be because a possible offer has been announced, or simply because the market has become aware of a potential bidder, including through a leak. At that point, the City Code on Takeovers and Mergers switches on in full.

The company becomes an offeree, the Takeover Panel steps in, and a set of disclosure and conduct rules immediately start to apply.^[3] The objective is not to encourage bids or push up price, but to create an orderly environment in which shareholders can assess what is happening. That distinction is important. The Panel regulates process, not outcomes.

The PUSU Deadline — and What It Actually Does

Most of the noise in takeover situations centres on the so-called “PUSU” deadline. Under Rule 2.6 of the Code, once a bidder is publicly identified, the Panel will normally require them to either announce a firm intention to make an offer within 28 days or walk away.^[1]

This is designed to stop bidders from hovering indefinitely and supporting the share price without committing. It introduces a forcing mechanism at the point where the market has enough information to start forming expectations.

The detail that is often missed is that this only applies once a bidder is named. Until that point, discussions can continue without a formal clock. That asymmetry is deliberate. If every early-stage conversation triggered a hard deadline, bidders would be far less willing to engage at all. At the same time, the Panel retains the ability to intervene if it believes undisclosed interest is creating a disorderly market.

The Line That Actually Matters: Rule 2.7

The real dividing line in any takeover situation is not the PUSU deadline but the move to a Rule 2.7 announcement.

A firm intention to make an offer is not a way of testing appetite or signalling interest. It is a binding commitment. Financing must be in place, advisers must stand behind it, and the bidder is effectively locked into proceeding on those terms, subject only to tightly defined conditions.^[2]

This is why bidders are more cautious than the commentary around them often suggests. It is easy to say that someone should “just put an offer on the table”. In practice, that only happens when they are confident they can follow through. If there is doubt around valuation, support, or execution, stepping back is usually the rational outcome.

Why Boards and Bidders Behave the Way They Do

Much of the frustration in these situations comes from a misunderstanding of incentives.

Boards are often criticised for not putting potential offers to shareholders. In reality, until there is a firm offer, there is nothing formal to present. Directors are required to assess credibility, deliverability, and value for shareholders as a whole, not to act as a conduit for speculative approaches.

Bidders, for their part, are weighing a different set of constraints. Once they move to a firm offer, they are committed. That makes the decision to proceed far more consequential than it might appear from the outside. What looks like hesitation is often simply discipline.

Why So Many Situations Don't Result in a Deal

From the outside, takeover processes can look inconsistent. Interest appears, disappears, and sometimes reappears again. Deadlines are set and then fade into irrelevance. Bidders walk away.

In most cases, the explanation is straightforward:

• A valuation gap persists, where the company and bidder cannot agree on a price
• Due diligence done by the bidder raises concerns
• Financing terms become less attractive due to macroeconomic issues

A valuation discrepancy is the most frequent reason and, often even if the board would like to recommend an offer, a major shareholder may not support the sale.

Even when visible bidders fall away, an offer period can continue. That reflects the possibility of other parties still engaging or a broader strategic process remaining active. The absence of a named bidder does not mean the situation is resolved; it simply means nothing has yet progressed to a point of formal commitment.

In Summary

The cleanest way to understand UK takeovers is to separate possibility from commitment.

Possible offers are fluid, informal, and often transient. Firm offers are binding, highly regulated, and comparatively rare. The structure of the Code exists to manage the transition between those two states, and most situations never make it across that line.

Once you view it through that lens, much of what looks like inconsistency starts to make sense. It is not a broken process. It is simply a disciplined one.