Poison Pill

A corporate poison pill commonly means a shareholder rights plan designed to deter an acquisition without board agreement. Depending on its terms, a defined ownership trigger can let other holders acquire rights or shares that dilute the triggering holder. Effects depend on the actual agreement and applicable law.

A corporate poison pill usually refers to a shareholder rights plan with a defined ownership trigger and consequences for the acquirer. In a common arrangement, other shareholders gain rights that can dilute the triggering holder. The actual plan controls the threshold, exclusions, redemption, and expiration; a generic account cannot establish how a particular plan works.

Separate deterrence from benefit to shareholders. A plan may give a board negotiating time, but it may also obstruct a favorable offer or preserve ineffective management. Staggered boards and severance arrangements are different takeover defenses, not interchangeable forms of the same mechanism. Outside corporate governance, calling every dependency a poison pill obscures important differences in consent and enforceability.

When to use it

When interpreting a shareholder rights plan, assessing takeover defenses, or learning how a specified ownership trigger changes acquisition incentives.

How it can help

Read the plan's trigger, duration, exclusions, and redemption terms. Evaluate negotiating benefits alongside shareholder and governance costs; obtain qualified review for a real transaction.