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What Is a Hostile Takeover?

Last reviewed: November 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 in one of two ways: a tender offer made directly to shareholders, or a proxy fight to replace the 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.

Real-world example: Air Products v. Airgas

In February 2010, after private approaches were rebuffed, Air Products launched an all-cash tender offer for all of Airgas's shares. Airgas's board judged the price inadequate and kept its poison pill in place. Combined with its staggered board, that meant Air Products could not take control through a single annual meeting. Air Products raised its bid several times, and on December 9, 2010 announced a "best and final" offer of $70 per share.

On February 15, 2011, the Delaware Court of Chancery ruled for Airgas (*Air Products & Chemicals, Inc. v. Airgas, Inc.*, 16 A.3d 48). The court held that a board acting in good faith, with a reasonable basis for believing an offer is inadequate, may keep a pill in place and block the offer under *Unocal*. It also stressed that a board cannot simply "just say no": its defenses must survive close judicial scrutiny. Air Products let its offer expire.

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
Natasha Belon — Denver, business, real estate and corporate law, Lotus Law PLLC
Glenn L. Udell — Chicago, real estate, business litigation and corporate law, Brown, Udell, Pomerantz & Delrahim, Ltd.

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.

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