This article is educational content explaining how a general market mechanism works. It is not investment advice, and it does not describe any specific current event, company, or security.
Why does one tender offer arrive at a 20 percent premium while another settles for barely 8 percent, even when both target companies look, on paper, fairly similar? The answer is not a formula pulled from a textbook. It is a negotiation, shaped by market data, legal guardrails, and the psychology of shareholders who ultimately have to say yes.
The reference price is the starting point, not the answer
Every tender offer premium begins with a benchmark: the target company’s trading price over some recent window before the offer becomes public or is formally announced. Acquirers and their advisers typically look at several reference points rather than a single day’s closing price, because a single day can be distorted by low volume, a broad market swing, or rumors already leaking into the stock. Common benchmarks include the closing price on the last undisturbed trading day (the last day before any leak or announcement affected the price), and volume-weighted average prices over the trailing 30, 60, or 90 trading days.
Using an average rather than a single price point matters because it smooths out short-term noise and gives both sides a more defensible number if the deal is later challenged in court or scrutinized by a regulator such as the U.S. Securities and Exchange Commission or an equivalent body elsewhere. A bidder who cherry-picks an unusually low single-day price to make its premium look larger than it really is invites exactly that kind of scrutiny, so advisers generally favor a blended, multi-window approach.
What actually moves the premium up or down
Once the reference price is set, the premium itself is a function of several forces working against each other. On one side, the acquirer wants to pay as little as possible above the market price, since every additional percentage point directly increases the cost of the deal and can dilute the return the acquirer expects from combining the businesses. On the other side, the target’s board has a duty to its shareholders to extract a price that reflects the company’s value, including any upside the market may not have fully priced in yet, such as pending contracts, cost synergies the acquirer expects to realize, or a turnaround already underway.
Competitive dynamics also matter enormously. If more than one potential acquirer is known or suspected to be interested, premiums tend to run higher, because the target’s board can credibly threaten to look elsewhere or run a formal auction process. Independent financial advisers on both sides typically produce a fairness opinion, drawing on comparable transactions in the same industry, discounted cash flow analysis, and premiums paid in similar recent deals, to anchor the negotiation in something more defensible than a simple round number. Historical data on comparable transactions in similar industries and of similar sizes provides a rough band, but every deal still gets negotiated within that band based on the specific target’s circumstances, the acquirer’s strategic urgency, and how much cash or stock capacity the acquirer has available.
Why the premium can look different after the fact
A premium that looked generous on the day of announcement can look modest, or even negative, months later if the broader market has since risen and the target’s peers have re-rated upward. This is one reason journalists and analysts are often careful to specify exactly which reference price and which date a quoted premium is measured against. A 25 percent premium over an unaffected 60-day average is a very different statement than 25 percent over a price the stock had already reached the day before the announcement leaked.
Regulatory frameworks in different jurisdictions also shape how premiums are disclosed and sometimes constrain them. Some markets require minimum premium thresholds or mandate that offers match the highest price the acquirer paid for shares in a defined look-back period, which limits how a bidder can structure the reference price to its advantage. Understanding these mechanics helps explain why headline premium figures vary so widely across deals and why the number alone rarely tells the full story of how a price was actually reached.
