HomeLaw & LegalCorporate LawWhat is Poison Pill?
Law & Legal·2 min·Updated Mar 15, 2026

What is Poison Pill?

Poison Pill Strategy

Quick Answer

A poison pill is a strategy used by companies to prevent hostile takeovers. It makes the company less attractive to potential acquirers by allowing existing shareholders to buy more shares at a discounted price if a takeover is attempted.

Overview

A poison pill is a defensive tactic used by companies to protect themselves from unwanted takeover attempts. When a company adopts a poison pill, it typically allows existing shareholders to purchase additional shares at a reduced price if a potential buyer tries to acquire the company without approval. This tactic can dilute the value of shares for the acquirer, making the takeover more expensive and less appealing. The mechanism behind a poison pill often involves issuing new shares or rights to current shareholders, which can significantly increase the total number of shares available. For example, if Company A is threatened by a takeover from Company B, it might issue new shares that existing shareholders can buy at a discount. This not only raises the cost for Company B but also empowers current shareholders, as they can increase their ownership stake in Company A. Poison pills are important in corporate law because they provide a way for companies to maintain control over their ownership and management. They serve as a deterrent against hostile takeovers, allowing companies to negotiate better terms or find alternative solutions. This strategy highlights the balance between shareholder interests and management control, making it a significant topic in discussions about corporate governance.


Frequently Asked Questions

A poison pill protects a company by making it more difficult and expensive for an acquirer to take control. By allowing existing shareholders to buy shares at a discount, the total number of shares increases, which can dilute the acquirer's ownership if they attempt a takeover.
Yes, there are several types of poison pills, including flip-in and flip-over strategies. Flip-in allows existing shareholders to buy more shares at a discount, while flip-over permits them to purchase shares in the acquiring company at a reduced price after a takeover.
Yes, poison pills can be challenged in court, especially if shareholders believe that the board is using them to entrench themselves rather than protect the company. Courts will evaluate whether the poison pill is a reasonable response to a legitimate threat or if it unfairly limits shareholder rights.