In a hostile takeover the bidder goes around the company’s board, either by offering to buy shares directly from shareholders, called a tender offer, or by trying to replace the directors in a proxy fight. The board can fight back with defenses such as a poison pill, a staggered board, a friendly rival bidder called a white knight, and golden parachutes for managers. In Delaware, courts judge whether the defense was proportionate. In India, SEBI’s 25% open-offer trigger and limits on issuing shares leave poison pills unavailable.
Why it matters: Who can take control of a company, and how, depends heavily on a country’s rules.
Summary: A hostile bidder goes around the board with a tender offer or a proxy fight, and the board defends with poison pills, staggered boards, white knights and golden parachutes, reviewed in Delaware for proportionality. In India, SEBI‘s 25% open-offer trigger and limits on share issuance leave poison pills unavailable.
- US clocks: Schedule 13D within five business days of crossing 5%, tender offers open at least 20 business days, Section 203’s three-year bar at 15%.
- A flip-in pill at 15% costs a raider about 23% of its stake value, so pills are almost never triggered.
- Airgas (2011) showed that a pill plus a staggered board can hold off a cash bid for well over a year.
- Revlon requires a board that decides to sell control to seek the best available price.
- India: crossing 25% triggers an open offer for 26% more; L&T reached 60.06% of Mindtree in 2019.
When a target’s board rejects an acquirer’s approach, a determined acquirer can go directly to shareholders through a tender offer (offering to buy shares directly from shareholders at a premium to the market price) or a proxy fight (trying to win shareholder votes to replace the target’s board with directors sympathetic to the deal). Target boards have developed a recognizable toolkit of defenses:
| Defense | How It Works |
|---|---|
| Poison Pill | Gives existing shareholders (other than the acquirer) the right to buy heavily discounted new shares if a hostile stake crosses a set threshold, diluting the acquirer’s position |
| Staggered Board | Only a fraction of directors are up for election each year, making a quick full board takeover via proxy fight much slower |
| White Knight | The target seeks a friendlier alternative acquirer willing to outbid the hostile one |
| Golden Parachute | Large contractual payouts triggered for existing executives if control changes, raising the effective cost of the takeover |
A bidder crossing 5% of a public company’s voting shares, intending to influence control, files a Schedule 13D within five business days (cut from ten calendar days in October 2023). A tender offer must stay open at least 20 business days, plus 10 more after any price change (Rule 14e-1). Under Delaware’s Section 203, a buyer crossing 15% without prior board approval cannot merge with the company for three years unless it reaches 85% in that transaction or wins the board plus two-thirds of other holders.
Unocal (1985) requires a real threat and a proportionate defense; Moran v. Household (1985) upheld the poison pill; Revlon (1986) requires a board selling control to seek the best price reasonably available. In Air Products v. Airgas (February 15, 2011), the Court of Chancery let Airgas keep its pill against a $70 cash offer pursued for some 16 months; with a staggered board, removing such a pill takes two annual elections.
A target has 100 million shares at $50 ($5,000 million). Its rights plan “flips in” at 15%: once a holder crosses it, every other holder may buy one new share per share held at $25. A raider buys 15 million shares ($750 million), triggering it.
- Other holders buy 85 million new shares for 85 × $25 = $2,125 million.
- Value per share = (5,000 + 2,125) ÷ (100 + 85) = $38.51.
- Raider: 15 ÷ 185 = 8.1%, worth 15 × 38.51 = $577.7 million: a $172.3 million (23%) loss, gained by the other holders at $13.51 per right.
So pills are almost never triggered; they push bidders toward negotiation or a proxy contest (Part 7.7: Activist Investors and Proxy Fights).
Target board: use the pill to buy time and price, not to say no forever. If an offer is below your documented standalone value range, keep the pill and show shareholders the gap; if it is inside the range, or you have decided to sell, Revlon points to a process for the best price. Bidder: never cross a pill; go around it with a premium that creates shareholder pressure or a proxy contest (two annual meetings with a staggered board).
Assuming a pill is a bluff: the raider above loses 23% at once. In December 2008 Trilogy, a competitor, deliberately bought through Selectica’s 4.99% pill to “force the board to make a decision”; the board issued shares to every other holder, cutting Trilogy’s stake from about 6% to about 3%, and the Delaware Supreme Court upheld it on October 4, 2010 (Versata v. Selectica). Read the rights plan before buying the first share.
What is a poison pill in simple terms?
A poison pill, formally a shareholder rights plan, lets every shareholder except a hostile buyer purchase new shares at a deep discount once the buyer crosses a set stake (15% in the example). Crossing the line is irrational, so the buyer must negotiate with the board or replace it.
Is a hostile takeover legal?
Yes. A bidder may offer to buy shares directly from holders, subject to disclosure, minimum offer periods and antitrust review, or run a proxy contest. What courts police is the board’s response, which must be proportionate to a real threat.
Why do poison pills not work in India?
Because an Indian board cannot issue cheap shares on its own: a preferential issue needs a shareholders’ special resolution and a price at or above a SEBI floor, and during an open offer the target cannot issue voting securities without shareholder approval (India Lens below).
The trigger. Under SEBI’s Takeover Regulations, 2011 (SAST), an acquirer reaching 25% of a listed company’s voting rights must make an open offer (Regulation 3(1)) for at least another 26% (Regulation 7), so a bidder crossing 25% must be ready to own 25 + 26 = 51%. Above 25%, holders may add only 5% per financial year without a fresh offer, and acquiring control triggers an offer at any stake.
Why pills fail. A preferential share issue needs a shareholders’ special resolution (Companies Act, 2013, s.62(1)(c)) and a price no lower than the higher of the 90- and 10-trading-day average prices (SEBI ICDR, from January 14, 2022). During an offer, SAST Regulation 26 bars the target from issuing voting securities or selling material assets without a special resolution by postal ballot. What remains: a white knight and the promoter‘s stake.
The case. In March 2019 Larsen & Toubro bought V. G. Siddhartha’s 20.32% of Mindtree at ₹980 a share (about ₹3,269 crore), then made an open offer at ₹980, India’s first hostile bid in IT, and held 60.06% by July 2, 2019.
Financing. From July 1, 2026, RBI lets banks fund up to 75% of the acquisition value when an Indian non-financial company (net worth above ₹500 crore) buys control, with consolidated debt to equity capped at 3:1. Read each $ million in Sections 2.4 to 2.7 as ₹ crore and the arithmetic holds; the tax rules do not.
Hostile bidders use tender offers and proxy fights; US boards answer with pills, staggered boards, white knights and parachutes under Delaware’s Unocal and Revlon standards, and a triggered pill costs a raider about 23% of its stake in the example. India’s Takeover Regulations replace that contest with a 25% trigger and a 26% open offer, and its share-issuance rules leave pills unavailable.
Four questions on this chapter. Decide on your answer first, then click “Reveal Answer.”
1. A target has 50 million shares at $40. A raider holding 10% triggers a flip-in pill letting the other holders buy one new share each at $20. Roughly what percentage of its stake value does the raider lose?
- About 47.4%
- About 23.7%
- About 10.0%
- About 50.0%
Reveal Answer
Answer: B. Value per share = (50 × 40 + 45 × 20) ÷ 95 = $30.53, so the raider’s shares lose 1 − 30.53 ÷ 40 ≈ 23.7% while its stake falls to 5.3%.
2. Under SEBI’s 2011 Takeover Regulations, what must an acquirer do when its holding reaches 25% of a listed company?
- Make an open offer for at least 26% more of the shares
- Obtain SEBI approval before buying further shares
- Launch a delisting offer at a board-set price
- Make a mandatory bid for every remaining share
Reveal Answer
Answer: A. Regulation 3(1) triggers an open offer at 25%, and Regulation 7 sets its minimum size at 26%, so a successful bidder reaches at least 51%.
3. Under Delaware’s Section 203, what happens to a buyer that crosses 15% of a company’s stock without prior board approval?
- Its voting rights above 15% are canceled for good
- It must sell back the excess at its purchase price
- It cannot merge with the company for three years
- It must tender for all the shares within 20 days
Reveal Answer
Answer: C. Section 203 blocks business combinations with an interested stockholder for three years unless the board approved in advance, the buyer reached 85% in one step, or the board and two-thirds of other holders approve.
4. A target has both a poison pill and a staggered board. What must a hostile bidder that will not negotiate usually do?
- Buy 15% of the shares to force the pill’s redemption
- File a Schedule 13D to suspend the pill during the bid
- Keep its tender offer open at least 20 business days
- Win proxy contests at two annual meetings
Reveal Answer
Answer: D. Only a third or so of directors stand each year, so replacing a majority that will redeem the pill takes two elections, the combination that sustained Airgas’s defense in 2011.
- 17 CFR 240.14e-1 (tender offer periods) — 20-business-day minimum and 10 days after a price change
- Delaware Code Title 8 §203; Arnold & Porter on Airgas; Foley & Lardner on Versata v. Selectica — 15% interested-stockholder rule; pill cases
- SEC Release 33-11253 (beneficial ownership reporting) — Schedule 13D deadline of five business days
- RBI, March 30, 2026
- SEBI SAST FAQs