Unocal Standard
The intermediate standard of review courts apply to board-adopted takeover defenses, requiring a reasonable threat assessment and a proportionate response.
When a board adopts a defensive measure in response to a perceived takeover threat, courts apply an intermediate, enhanced standard of review rather than either the deferential business judgment rule or the strict entire fairness standard. The board must first show it had reasonable grounds, after a good-faith and reasonable investigation, to believe a threat to corporate policy and effectiveness existed.
If that threshold is met, the board must then show the defensive response was reasonable in relation to the threat posed — proportionate, and not so preclusive or coercive as to be draconian, and generally falling within a range of reasonable responses rather than the single best conceivable one. This two-part inquiry sits between ordinary deference and full fairness review precisely because a defensive measure raises the concern that a board may be protecting its own position rather than shareholder interests, without the transaction necessarily involving classic self-dealing.
The reasonable-threat and proportionate-response prongs are analytically separable and often turn on different evidence, which is why Juricratic models a Unocal challenge as two linked but distinct dials rather than one composite standard — a case can be strong on threat identification and weak on proportionality, or vice versa, and the simulation should show that asymmetry rather than averaging it away.
How it actually shows up
Boards build a contemporaneous record — board minutes, advisor presentations, the specific threat identified — before and while adopting a defensive measure specifically to satisfy this standard if challenged later. Plaintiffs attacking a takeover defense target either prong: arguing the perceived threat was pretextual or unreasonable, or arguing the response was disproportionate, coercive, or effectively precluded any realistic path for shareholders to accept the bid.
- What is the Unocal standard?
- It is an intermediate, enhanced standard of judicial review for board-adopted takeover defenses, requiring the board to show it reasonably identified a threat and that its defensive response was proportionate to that threat.
- How is the Unocal standard different from the business judgment rule?
- Unlike the deferential business judgment rule, this standard requires the board to affirmatively justify both its threat assessment and the reasonableness of its defensive response, rather than being presumed to have acted properly.
- What makes a takeover defense disproportionate under this standard?
- A response can be found disproportionate if it is coercive toward shareholders or so preclusive that it forecloses any realistic possibility of the takeover succeeding, rather than falling within a range of reasonable responses to the identified threat.
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