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What Is a Hostile Takeover?
Last reviewed: October 2026 · Jurisdiction: United States (federal securities law; Delaware corporate law)
A hostile takeover is an attempt to buy control of a company over the objection of its board of directors. The bidder goes around the board, usually through a tender offer made directly to shareholders or a proxy fight to replace directors. It is mostly a public-company event, governed by federal securities law and the target's state corporate law.
| Key facts (U.S. federal law + Delaware, as of October 2026) | Rule | Source |
|---|---|---|
| Crossing 5% of a public company's voting stock | File a Schedule 13D within 5 business days | 17 CFR 240.13d-1 |
| How long a tender offer must stay open | At least 20 business days | 17 CFR 240.14e-1 |
| Target board's response to a tender offer | Must state its position within 10 business days | 17 CFR 240.14e-2 |
| Antitrust waiting period (HSR) | Generally 30 days; 15 days for a cash tender offer | 15 U.S.C. § 18a(b) |
| Delaware business-combination statute | A 15%+ "interested stockholder" can't do a business combination for 3 years unless an exception applies | 8 Del. C. § 203 |
| How Delaware courts review defenses | Reasonable threat + proportionate response (*Unocal*, 1985); best price once a sale is inevitable (*Revlon*, 1986) | *Unocal Corp. v. Mesa Petroleum*, 493 A.2d 946 (Del. 1985); *Revlon v. MacAndrews & Forbes*, 506 A.2d 173 (Del. 1986) |
How a hostile takeover works
- Tender offer. The bidder offers to buy shares straight from shareholders, usually at a premium to the market price and on the condition that a minimum number of shares is tendered. Federal tender offer rules set the minimum offer period and require the target's board to tell shareholders where it stands.
- Proxy fight. The bidder asks shareholders to vote in its own director candidates, who would then approve the deal or remove defenses. In contested director elections, both sides must now use a universal proxy card listing every nominee.
- Toehold. The bidder buys shares on the open market first. Once it passes 5%, it must disclose its stake and its plans in a Schedule 13D.
- Bear hug. The bidder sends the board a public offer letter to pressure it into negotiating. It becomes hostile if the bidder then goes to shareholders over the board's objection.
Friendly merger vs. hostile takeover
| Friendly merger | Hostile takeover | |
|---|---|---|
| Who negotiates | The two boards | The bidder and the shareholders, around the target's board |
| Typical tools | Merger agreement, shareholder vote | Tender offer, proxy fight, open-market buying |
| Due diligence | Full access to non-public information | Mostly public filings |
| Target board's stance | Recommends the deal | Opposes it and may use defenses |
Common takeover defenses
| Defense | How it works |
|---|---|
| Shareholder rights plan ("poison pill") | If anyone crosses a set ownership threshold without board approval, every other shareholder can buy shares at a discount, which dilutes the bidder. Delaware upheld the device in *Moran v. Household International*, 500 A.2d 1346 (Del. 1985). |
| Staggered (classified) board | Only part of the board is up for election each year, so a bidder can't replace a majority in one meeting. |
| State anti-takeover statutes | In Delaware, § 203 delays a business combination with a 15% holder for three years unless the board approved it in advance or another exception applies. |
| White knight | The board finds a friendlier buyer. |
| "Just say no" | The board refuses to negotiate and keeps its defenses in place. In *Air Products v. Airgas*, 16 A.3d 48 (Del. Ch. 2011), the court let a board keep a pill in place against an all-cash offer it judged inadequate. |
How courts judge a board's response
Under Delaware law, a board that adopts defenses against a takeover threat has to show it had reasonable grounds to see a threat and that its response was reasonable in relation to it (*Unocal*). Once a sale or breakup of the company is inevitable, the directors' duty shifts to getting the best value reasonably available for shareholders (*Revlon*). Other states use their own standards and statutes, so the target's state of incorporation matters.
Can a private company face a hostile takeover?
Rarely. Private-company shares don't trade publicly, and most shareholder or operating agreements restrict transfers, so a bidder can't go around the board the same way. The fights that do happen in private companies are usually disputes among owners. See What is a shareholders agreement?
Talk to a corporate or business law attorney
- Find a Corporate Law Attorney · Find a Business Law Attorney
- Gabriel S. Saade — Miami, corporate and business law, DarrowEverett LLP
- Rocco Cozza — Pittsburgh, corporate law, Cozza Law Group PLLC
Related reading: What is corporate governance? · What is a shareholder derivative lawsuit? · What is a letter of intent? · What is antitrust law?
This article is general information, not legal advice, and doesn't create an attorney-client relationship. Takeover rules depend on federal securities law and the target's state of incorporation. Talk to a licensed attorney about your situation.
Sources
Frequently Asked Questions
What is a poison pill defense?
A shareholder rights plan. If a bidder crosses a set ownership threshold without board approval, the other shareholders can buy more shares at a discount, which dilutes the bidder and makes the takeover far more expensive. Boards typically redeem the pill for a deal they approve.
What is a staggered board?
A board where only a fraction of directors, often a third, is elected each year. A bidder running a proxy fight can't replace a majority at a single annual meeting.
What is the "just say no" defense?
A board's refusal to negotiate with a hostile bidder while keeping its defenses in place. In Air Products v. Airgas (Del. Ch. 2011), a Delaware court allowed a board to keep its poison pill against an all-cash offer the board believed undervalued the company.
What is a white knight?
A friendlier buyer the target's board brings in as an alternative to the hostile bidder.
What duties do directors owe in a hostile takeover?
In Delaware, directors who adopt defenses must show they reasonably saw a threat and responded proportionately (Unocal). If a sale of the company becomes inevitable, they must seek the best value reasonably available for shareholders (Revlon). Other states apply their own rules.
How long does a tender offer have to stay open?
Under SEC Rule 14e-1, at least 20 business days, and longer if key terms such as the price change. The target's board has 10 business days to tell shareholders its position.
Can a private company be taken over against the board's will?
Rarely. Its shares don't trade publicly and transfers are usually restricted by a shareholders or operating agreement, so most control fights in private companies are disputes among the owners.
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