A tender offer is a public bid to buy shares directly from a company’s existing shareholders at a stated price, usually above the current market price, within a fixed deadline. The bidder goes around the target company’s board and lets each shareholder decide individually whether to sell. That structure makes the tender offer the primary tool for hostile takeovers and a common one for friendly acquisitions, stock buybacks, and going-private deals.
The offered price is almost always at a premium. Historically, acquisition premiums have averaged roughly 25 to 40 percent above the pre-announcement market price, though the number depends on the deal. The premium compensates shareholders for parting with stock that might keep climbing, and it creates urgency to decide before the offer expires.
Most offers carry a minimum condition. The bidder will only complete the purchase if enough shares are tendered to reach a specified ownership threshold. If shareholders don’t turn out in sufficient numbers, the bidder walks away and everyone keeps their stock.
How a Tender Offer Works Step by Step
The offer opens with a public announcement and the filing of disclosure documents with the SEC. From that date, federal rules require the offer to stay open for at least 20 business days. Shareholders therefore have about a month to evaluate the terms.
Shareholders who want to participate instruct their broker to tender their shares to a depositary agent the bidder has designated. Tendering doesn’t transfer ownership right away. The shares sit in escrow until the offer closes and the bidder decides whether to go through with the purchase. Once the offer period expires and the minimum condition is met, the bidder accepts the shares and must pay promptly.
If the bidder changes material terms during the offer, such as raising the price or increasing the number of shares sought, the clock resets. The offer must then remain open for at least 10 more business days from the date of the change.
After the initial period ends, the bidder can open a subsequent offering period of at least three business days. Shareholders who missed the first deadline can still tender during this window, and the bidder must accept and pay for those shares immediately at the same price.
Shareholder Protections Built Into the Rules
Federal rules layer several safeguards onto the process. They exist because, without them, bidders could pressure shareholders into snap decisions on major financial choices.
Withdrawal Rights
A shareholder who has already tendered can change their mind and withdraw the shares at any time while the initial offer remains open. The mechanic is straightforward: submit a written notice to the depositary specifying the shares being pulled back. One catch worth knowing. Withdrawal rights do not apply during a subsequent offering period after the initial deadline, so shares tendered during that extension are locked in.
Pro-Rata Purchases
When a bidder seeks only a portion of a company’s stock and more shares are tendered than the bidder wants, the bidder must buy proportionally from every participating shareholder rather than picking and choosing. If a bidder seeks 50 percent of the stock and every outstanding share is tendered, each shareholder will have half of their tendered shares purchased. Large institutional holders can’t get preferential treatment over retail holders.
All-Holders, Best-Price Rule
The offer must be open to every holder of the class of stock being sought, and every tendering shareholder must receive the highest price paid to any other tendering shareholder. If the bidder raises the price partway through, shareholders who tendered earlier at the lower price automatically get the higher amount. Side deals with favored shareholders are off the table.
Prompt Payment
After the offer closes, the bidder must either pay for accepted shares or return them promptly. The rules don’t define exactly how many days “promptly” means, but leaving shareholders in limbo violates federal securities law.
What the Bidder and Target Must Disclose
The disclosure framework traces back to the Williams Act, a 1968 amendment to the Securities Exchange Act of 1934 that added Sections 13(d) and 14(d) through 14(f). Before it, bidders could launch surprise offers with almost no information and leave shareholders to decide blind.
Schedule TO
Any bidder whose tender offer would result in owning more than five percent of a company’s stock must file a Schedule TO with the SEC on the day the offer launches. It discloses the bidder’s identity and background, the source of the funding, the terms of the offer, the purpose of the transaction, and any prior dealings with the target. The filing becomes public immediately.
Schedule 14D-9
The target company must publish its position on the tender offer within 10 business days of commencement. It files that position on Schedule 14D-9, stating whether the board recommends that shareholders accept, reject, or remain neutral, and giving the reasons. This document often includes a fairness opinion from an independent financial advisor.
The Five-Percent Ownership Trigger
Separately from the tender offer rules, anyone who acquires beneficial ownership of more than five percent of a public company’s stock must file a Schedule 13D with the SEC. As of 2024, the filing is due within five business days of crossing the threshold. The Schedule 13D discloses the buyer’s identity, funding sources, and plans for the company, and in practice a 13D often signals that a tender offer or other acquisition attempt may follow.
Friendly Versus Hostile Bids
A tender offer is friendly when the target’s board supports it and recommends shareholders accept. It’s hostile when the bid bypasses or contradicts the board’s wishes and goes directly to shareholders over management’s objections. The mechanics are identical either way. The difference is whether the board is cooperating.
Hostile bids are where defensive tactics come in, and two show up most often.
Poison Pills
A shareholder rights plan, commonly called a poison pill, is the most common defense. The board adopts a plan giving existing shareholders the right to buy additional shares at a steep discount if any single buyer crosses an ownership threshold, usually 10 to 20 percent. The resulting dilution makes the acquisition prohibitively expensive for the hostile bidder. Boards can adopt poison pills without shareholder approval, so they can be deployed quickly. The bidder’s main recourse is a proxy fight to replace the board with directors who will dismantle the pill.
White Knights
A target facing a hostile bid may seek out a friendlier acquirer, known as a white knight. The white knight makes a competing offer on terms the board prefers, often with commitments to retain management or preserve the business strategy. The result can be an auction that drives the price up for shareholders even when the original bidder loses.
Boards have other tools too, including selling off the specific assets the bidder wants, restructuring debt, or issuing new shares to a friendly party. Each carries legal risk, particularly if shareholders later argue the board was protecting its own jobs rather than maximizing value.
What Happens After the Offer Closes
A tender offer rarely ends the story. In most acquisitions, the bidder’s goal is 100 percent ownership, and the tender offer is only the first step.
Two-Step Mergers
The most common structure pairs a tender offer with a follow-up merger. First, the bidder acquires a majority of shares through the tender offer. Second, the bidder merges the target into a subsidiary, automatically converting the remaining shares into the right to receive the same price paid in the tender offer. Shareholders who didn’t tender have their shares cashed out regardless.
Short-Form Mergers
If the bidder reaches 90 percent ownership through the tender offer, most states allow a short-form merger, which completes the back-end merger without a shareholder vote. That is why many bidders set a high minimum condition and open a subsequent offering period: the extra shares can push them across the 90 percent line.
Appraisal Rights
Shareholders who believe the offered price undervalues their stock may have appraisal rights, sometimes called dissenters’ rights. These allow a shareholder to petition a court to determine the fair value of their shares independently. The process varies significantly by state, and shareholders must follow strict procedural requirements to preserve the right. Missing a deadline or voting in favor of the merger can permanently forfeit an appraisal claim. The cases are expensive and slow, but they occasionally produce valuations above the tender offer price.
Issuer Tender Offers and Going-Private Deals
Not every tender offer comes from an outside buyer. In an issuer tender offer, a company offers to repurchase its own shares from existing shareholders. Companies use these to return excess cash, boost earnings per share by reducing the share count, or signal that the stock is undervalued. The same core SEC rules apply, including the 20-business-day minimum and prompt payment.
A tender offer can also serve as the mechanism for taking a public company private. In a going-private transaction, the goal is to acquire every outstanding share and delist the company. These deals trigger additional SEC disclosure requirements under Rule 13e-3, including a “Special Factors” section at the front of the disclosure document that addresses whether the transaction is fair to unaffiliated shareholders and describes appraisal rights. A legend on the cover page must state that the SEC has not approved the transaction or passed on its fairness, and that any claim to the contrary is a criminal offense.
Tax Consequences of Tendering Your Shares
Tendering is a taxable event. The treatment depends on who is buying and how long you held the stock.
When an Outside Buyer Purchases Your Shares
A third-party tender offer is treated as a sale. You recognize a capital gain or loss equal to the difference between the tender price and your cost basis. Shares held more than one year qualify for long-term capital gains treatment. For 2026, federal long-term rates are 0 percent for single filers with taxable income up to $49,450 (or $98,900 for married filing jointly), 15 percent up to $545,500 ($613,700 joint), and 20 percent above those thresholds. Short-term gains on shares held one year or less are taxed at ordinary income rates, which range from 10 to 37 percent in 2026.
When the Company Buys Back Its Own Stock
The tax treatment is more complicated for an issuer tender offer. Under Section 302 of the Internal Revenue Code, the IRS tests whether the redemption qualifies as a sale (capital gain) or should be recharacterized as a dividend. Capital gain treatment applies if the redemption completely terminates your interest, is substantially disproportionate (your ownership percentage drops significantly), or is not essentially equivalent to a dividend. If none of those tests is met, the payment is taxed as a dividend, which can produce a higher bill depending on your situation.
Wash Sale Risk
If you tender shares at a loss and then repurchase substantially identical stock within 30 days before or after the sale, the wash sale rule disallows the loss deduction. The disallowed loss is added to the basis of the replacement shares, deferring the tax benefit rather than eliminating it. The 61-day window around the sale matters most for shareholders who tender into a partial offer and then buy back into the same company.
Mini-Tender Offers Are a Different Animal
A mini-tender offer targets less than five percent of a company’s shares, which puts it outside Regulation 14D. The bidder doesn’t file a Schedule TO, and shareholders don’t get the same information they would in a standard tender offer. Congress limited Section 14(d) to offers above the five-percent threshold, so mini-tenders sit in a regulatory gray zone covered only by the general antifraud provisions of Section 14(e).
The SEC has warned investors that mini-tender offers frequently come at below-market prices, betting that shareholders won’t compare the offer to the current stock price. Shareholders who accept generally cannot withdraw their shares, and the bidder can extend the offer without triggering withdrawal rights. If you receive a mini-tender offer, compare the offered price to the stock’s current market value before responding. Walking away is often the right move.