Tender Offer Premium
A tender offer premium is the percentage by which an acquirer's offer price per share exceeds the target company's unaffected stock price — typically the closing price one month or one trading day before the deal announcement — and represents the financial incentive offered to target shareholders to tender their shares and accept the transaction.
When a company or private equity firm launches a tender offer to acquire all or a majority of a target company's outstanding shares, it must offer a price high enough to persuade existing shareholders to sell. The tender offer premium — sometimes called the acquisition premium or control premium — quantifies the inducement over what the shares were trading at before any deal speculation entered the market.
Historical data from Refinitiv and Bloomberg show that U.S. tender offer premiums have averaged between 30 and 45 percent over the unaffected share price across various market cycles, though individual transactions vary considerably. A deal in a highly competitive bidding situation may carry a premium exceeding 60 percent, while a friendly, pre-negotiated transaction for a fairly valued target might close with a 20 percent premium.
The unaffected price baseline is critical and contested. If rumors of a deal leak before the announcement, the target's stock price will have already risen, making the one-day-prior baseline artificially elevated. Bankers and courts in appraisal litigation therefore commonly use a 30-, 60-, or 90-day volume-weighted average price prior to any observable market speculation as the reference point for measuring the true premium paid.
The premium reflects several economic factors. Control value is the primary driver: acquiring a controlling stake allows the buyer to direct strategy, allocate capital, and realize synergies unavailable to minority shareholders. The premium compensates target shareholders for surrendering that optionality. The expected synergies the acquirer projects — cost savings, revenue enhancements, financial engineering benefits — set a ceiling on how much premium can be paid before the deal becomes dilutive to the acquirer's own shareholders.
Investment banks advising target boards are obligated to render a fairness opinion analyzing whether the offered premium is adequate relative to intrinsic value, comparable transactions, and discounted cash flow analyses. Courts applying Delaware appraisal law have periodically wrestled with whether a deal price plus a market premium represents fair value, with landmark decisions such as Dell and DFC Global holding that competitive market processes are strong evidence of fair value.
For merger arbitrageurs, the spread between the current trading price and the offer price after announcement represents their expected return, which compensates for deal failure risk. A higher announced premium typically compresses the arbitrage spread because a higher offer price leaves less room for the deal to be topped by a competing bidder.