Tender offer rules under the Williams Act and SEC Regulations 14D and 14E require anyone making a public offer to buy shares of a publicly traded company to file detailed disclosures, keep the offer open for at least 20 business days, treat every shareholder equally on price and access, and allow shareholders to withdraw tendered shares at any point before the deadline. The rules exist to give you enough information and enough time to decide whether to sell, and to keep bidders from using pressure tactics or side deals to squeeze out control.
When the Rules Apply
Federal securities law never defines “tender offer” in the statute, so courts use an eight-factor test from the Wellman case to decide whether a transaction qualifies. The factors include widespread solicitation of shareholders, an offer for a substantial percentage of shares, a premium over market price, firm rather than negotiable terms, minimum or maximum share conditions, a limited time window, pressure on shareholders to decide quickly, and public announcements accompanying a rapid buildup of the target’s stock.1U.S. Securities and Exchange Commission. Correspondence – Sonic Automotive, Inc.
Courts weigh these factors rather than counting them. A deal can qualify as a tender offer without every factor present, and no single factor decides the question. Once a transaction crosses that line, the full set of SEC rules applies.
What the Bidder Has to Disclose
Section 14(d) of the Securities Exchange Act requires anyone making a tender offer that would push their ownership above 5% of a class of equity securities to file a disclosure statement with the SEC before sending the offer to shareholders.2Office of the Law Revision Counsel. 15 USC 78n – Proxies The filing is called Schedule TO. The bidder must submit it to the SEC, deliver it to the target company, and send it to any exchange where the stock trades on the day the offer begins.3eCFR. 17 CFR 240.14d-100 – Schedule TO
Schedule TO tells you who the bidder is, including anyone acting as part of a group. It must specify the source and total amount of funds for the purchase, so you can judge whether the bidder can actually close. It also has to explain the purpose of the offer and disclose concrete plans for the target after acquisition, including any changes to management, corporate structure, business operations, or plans for a follow-on merger or going-private transaction.3eCFR. 17 CFR 240.14d-100 – Schedule TO
The offer formally “commences” at 12:01 a.m. on the date the bidder first publishes or sends the means to tender to shareholders. The means to tender includes the transmittal form or instructions on how to get one.4eCFR. 17 CFR 240.14d-2 – Commencement of a Tender Offer
What the Target Company Has to Tell You
Once a tender offer begins, the target company must publish a statement to shareholders within 10 business days disclosing whether the board recommends accepting, recommends rejecting, expresses no opinion, or is unable to take a position. The board has to give its reasons.5eCFR. 17 CFR 240.14e-2 – Position of Subject Company With Respect to a Tender Offer
If the target’s board or management actively solicits shareholders to accept or reject the offer, they must also file a Solicitation/Recommendation Statement on Schedule 14D-9 as soon as practicable on the date that solicitation begins.6eCFR. 17 CFR 240.14d-9 – Recommendation or Solicitation by the Subject Company and Others Schedule 14D-9 is where you find the details that matter most for judging the board’s position: any conflicts of interest directors or officers have regarding the offer, any arrangements between target management and the bidder, and any compensation triggered by a change in control, such as severance packages.
The target must also disclose whether it’s in negotiations over competing transactions like a rival merger. If material facts change after the initial filing, the Schedule 14D-9 has to be promptly amended.7eCFR. 17 CFR 240.14d-101 – Schedule 14D-9
Equal Access and Equal Price
Rule 14d-10 imposes two non-negotiable requirements on every tender offer. The offer must be open to every holder of the class of securities being sought; a bidder cannot cherry-pick participants. And the price paid to any shareholder must be the highest price paid to any other shareholder in the same offer.8eCFR. 17 CFR 240.14d-10 – Equal Treatment of Security Holders
This prevents a bidder from cutting a sweeter deal with insiders or large institutional holders to lock up control while leaving retail shareholders with worse terms. If a bidder raises its offer during the tender period, everyone who already tendered at the lower price gets the higher amount.
The 20-Business-Day Minimum and Your Right to Withdraw
Rule 14e-1 requires every tender offer to remain open for at least 20 business days from the date it is first published or sent to shareholders.9eCFR. 17 CFR 240.14e-1 – Unlawful Tender Offer Practices That window is your time to read the Schedule TO, see what the board recommends on Schedule 14D-9, talk to a financial advisor, and decide.
If the bidder changes the offer price or the percentage of shares sought, the offer must stay open for at least 10 additional business days from the date the change is announced.9eCFR. 17 CFR 240.14e-1 – Unlawful Tender Offer Practices You get time to reassess.
Throughout the entire offer period, you can withdraw shares you’ve already tendered. Change your mind any time before expiration. This is what makes tendering early costless: if a competing bid appears or the board issues a negative recommendation, you pull your shares back and reconsider.
Subsequent Offering Period
After the initial 20 business days expire, a bidder may open a subsequent offering period of at least three additional business days. It’s available only when the bidder is offering to buy all outstanding shares of the class, has immediately accepted and paid for shares tendered in the initial period, and offers the same price in both periods.10eCFR. 17 CFR 240.14d-11 – Subsequent Offering Period
Important difference: withdrawal rights do not apply during the subsequent offering period. Once you tender in this window, you cannot pull the shares back. The window exists so shareholders who missed the initial deadline can still participate on the same terms, but the loss of withdrawal rights means you should be certain before tendering.
Proration When the Offer Is Oversubscribed
When a bidder offers to buy fewer shares than shareholders tender, the bidder must accept shares pro rata from every shareholder who tendered, in proportion to the number each person offered.11eCFR. 17 CFR 240.14d-8 – Exemption From Statutory Pro Rata Requirements Tender 1,000 shares into an offer that ends up 50% oversubscribed and the bidder buys roughly two-thirds of your shares, returning the rest. This prevents a first-come, first-served race that would punish shareholders who took time to evaluate.
Anti-Fraud Rules and Insider Trading
Regulation 14E applies to all tender offers regardless of size. It prohibits any fraudulent, deceptive, or manipulative conduct connected with a tender offer, with no size floor.
Rule 14e-3 targets trading on inside information about upcoming tender offers. Anyone who possesses material nonpublic information about a tender offer, and knows or should know that the information came from the bidder, the target, or their insiders, is prohibited from trading in the target’s securities once the bidder has taken substantial steps toward commencing the offer.12eCFR. 17 CFR 240.14e-3 – Transactions in Securities on the Basis of Material, Nonpublic Information in the Context of Tender Offers
The rule reaches further than general insider trading law. Typical insider trading doctrine requires proof that the trader breached a fiduciary duty. Rule 14e-3 drops that requirement. Possession of the information plus knowledge of its nonpublic nature is enough.13SEC Historical Society. Fair To All People – The SEC and the Regulation of Insider Trading The rule also prohibits tipping: insiders at either the bidder or the target cannot share confidential tender offer information with anyone who might trade on it.
Rule 14e-4 prohibits tendering shares you don’t actually own or have a guaranteed right to acquire. In a partial tender offer, anyone tendering must hold a net long position at least equal to the number of shares tendered, both at the time of tender and at the end of the proration period.14eCFR. 17 CFR 240.14e-4 – Prohibited Transactions in Connection With Partial Tender Offers Short tendering inflates the count of shares apparently tendered and distorts the proration calculation, diluting the acceptance ratio for shareholders who actually own the stock.
After a tender offer closes, the bidder must promptly either pay the agreed consideration or return the tendered shares. Settlement follows normal financial industry practices, typically a few business days after the offer expires.
Mini-Tender Offers: A Gap to Watch
Section 14(d) only applies to offers that would push ownership above 5%, which means bids for less than 5% of a company’s shares (mini-tender offers) are exempt from the filing, disclosure, and procedural protections of Regulation 14D.15Securities and Exchange Commission. Commission Guidance on Mini-Tender Offers and Limited Partnership Tender Offers
The anti-fraud provisions of Regulation 14E still apply, so the bidder cannot lie about the terms. But you don’t get mandatory disclosures, the 20-business-day minimum, or the all-holders/best-price rule. Mini-tender offers are sometimes structured at below-market prices in the hope that shareholders won’t check. If one lands in your mailbox, compare the offer price to the current market price before responding. The SEC has repeatedly warned investors to be cautious with these offers.
Issuer (Self-Tender) Offers
When a company buys back its own shares through a tender offer, a parallel set of rules applies under Rule 13e-4. The core protections mirror third-party offers: at least 20 business days open, withdrawal rights, open to all holders, same price for everyone.16eCFR. 17 CFR 240.13e-4 – Tender Offers by Issuers
An issuer conducting a self-tender must file a Schedule TO and disclose the purpose of the buyback, the source of funds, and how the transaction will affect the company’s financial condition. One extra restriction applies to issuers: the company and its affiliates cannot buy shares of the same class outside the tender offer until at least 10 business days after the offer terminates.16eCFR. 17 CFR 240.13e-4 – Tender Offers by Issuers
Tax Consequences When You Tender
Tendering shares for cash is a taxable event. Shares held more than one year produce long-term capital gains. For 2026, those rates are 0% on taxable income up to $49,450 for single filers ($98,900 for married filing jointly), 15% above those thresholds, and 20% once taxable income exceeds $545,500 for single filers ($613,700 joint).17Tax Foundation. 2026 Tax Brackets and Federal Income Tax Rates Shares held one year or less produce short-term capital gains, taxed at your ordinary income rate.
The gain is the difference between the tender price and your cost basis. If you acquired shares at different times and prices, each lot has its own basis and holding period. In a partial tender where only some of your shares are accepted, only the accepted shares trigger tax. High-income shareholders should also factor in the 3.8% net investment income tax that applies on top of the capital gains rate.