Anti-Takeover Defenses and Structural Impediments

The defenses come from three different sources: board-level documents (rights plans), corporate charters (staggered boards), and state statutes (control-share, fair-price, business-combination). Each operates on a different trigger and has a different way of being neutralized.

Shareholder Rights Plan (Poison Pill)

A shareholder rights plan, also called a poison pill, is a board-adopted mechanism that distributes rights to existing shareholders. Those rights sit dormant until a triggering event makes them exercisable, at which point they dilute the acquirer.

• Adoption: Board resolution. No shareholder vote required at adoption; modern plans increasingly carry shareholder approval at refresh
• Trigger threshold: typically 10% to 20% beneficial ownership; 10% is the most common modern threshold
• Flip-in provision: on trigger, all non-triggering shareholders may buy additional target shares at a deep discount (often 50% of market price), massively diluting the acquirer's position
• Flip-over provision: on a back-end merger, non-triggering shareholders may buy ACQUIRER shares at a discount, extending the dilution into the acquirer's own equity
• Redemption: the board can redeem the rights for a nominal value (often a fraction of a cent per right), neutralizing the pill at any time before the trigger; this is the negotiating lever between a hostile bidder and the target board
• Sunset: modern plans typically run 1 to 3 years; early plans ran 10 years

Think of it this way: a poison pill is not a sale-blocker. It is a board-control mechanism. The pill forces a hostile bidder to negotiate with the target board because the board holds the redemption switch.

Exam Tip: Gotchas

• The trigger is BENEFICIAL ownership, not record ownership. Options, derivatives, and swap positions that confer economic exposure can count toward the trigger threshold depending on how the plan is drafted.
• The pill itself is defeasible by the board. A standalone pill can be redeemed by the next board, so an activist who replaces the board in one proxy contest can neutralize it.

Staggered (Classified) Board

A staggered board, also called a classified board, divides the directors into 2 or 3 classes. Only one class stands for election each year, so a hostile acquirer cannot replace the entire board in a single proxy contest.

• Three-class structure: most common; each director serves a 3-year term; only one-third of seats up for election in any year
• Permitted by Delaware General Corporation Law: charter-level provision; charter amendment to declassify requires shareholder vote
• Director removal: under default Delaware rule, directors of a classified board can be removed only for cause (absent a contrary charter provision), which is a high bar
• Combined with a poison pill: a hostile acquirer paired with an activist would need TWO consecutive annual proxy contests (effectively two years) to win majority board control and then redeem the pill

Think of it this way: a staggered board is not a sale-blocker. It is a clock. Each proxy cycle that the hostile bidder has to win adds another year to the deal timeline, which typically exhausts the bidder's financing window and patience.

Exam Tip: Gotchas

• The poison pill plus staggered board combo is the strongest STRUCTURAL defense package. A pill alone can be redeemed by the next board, so a hostile bidder paired with an activist could replace the board in one cycle and redeem the pill. Adding a staggered board doubles the cycle to two years, which usually outlasts a hostile bidder's patience or financing window.

Control Share Acquisition Statute

A control share acquisition statute is a state-law mechanism that strips voting rights from shares acquired above specified thresholds unless disinterested shareholders vote to restore them.

• Adopting states: Ohio (the leading model), Indiana, Virginia, and others
• Ohio model thresholds: triggers at one-fifth (20%), one-third, and majority ownership bands
• Effect: the acquirer can buy the shares but cannot vote them above the threshold without a target-board-controlled disinterested-shareholder vote to restore the voting rights
• Constitutional: the United States Supreme Court upheld the Indiana statute against challenges that it was preempted by federal tender-offer law and that it violated the Commerce Clause

Exam Tip: Gotchas

• A control share statute strips VOTING rights, not OWNERSHIP rights. The acquirer still holds the shares economically; the shares just cannot be voted above the threshold until the disinterested-shareholder vote restores them.

Fair-Price Statute

A fair-price statute is a state-law mechanism designed to neutralize coercive two-tier tender offers. A two-tier offer pays a premium for the front-end tendered shares and a lower price for the back-end merger, pressuring shareholders to tender quickly to avoid the lower back-end.

• Requirement: any back-end merger after a partial tender offer must be at a fair price (typically the highest price paid in the front-end offer) OR approved by a supermajority of disinterested shareholders
• Purpose: removes the coercive pressure by guaranteeing back-end shareholders are not paid less than front-end tenderers

Exam Tip: Gotchas

• The fair-price statute does NOT block tender offers. It blocks the LOWER back-end leg. A two-tier offer that pays the same price at front and back clears the statute. A single-tier offer at a uniform price is unaffected.

Business Combination Statute (the Delaware Model)

The Delaware business combination statute prohibits a target Delaware corporation from engaging in any "business combination" with an "interested stockholder" for 3 years after the acquirer crosses 15% ownership, unless one of three exceptions applies.

• 15% trigger: an acquirer becomes an "interested stockholder" when it crosses 15% of the target's voting stock
• 3-year freeze: no merger, asset sale, or other business combination with the interested stockholder is permitted for 3 years
• Default applies to all Delaware corporations: companies may opt out via charter or bylaw amendment, but the default is in

The three exceptions that let a deal proceed without the 3-year freeze:

• Board pre-approval: the target board approved the transaction (or the share acquisition) before the acquirer crossed 15%
• High-threshold acquisition: the acquirer obtained 85% or more of voting stock in the same transaction that crossed 15% (the calculation excludes shares owned by directors, officers, and certain employee-stock-ownership-plan (ESOP) holdings)
• Two-thirds disinterested vote: 66 2/3% of disinterested shareholders vote to approve the business combination at or after the 15% crossing

Think of it this way: the Delaware business combination statute is the back-stop for everything else. Even if the acquirer clears the pill and beats the staggered board, the statute imposes a 3-year freeze on merger consideration unless the acquirer either negotiated board approval beforehand, swept up 85% in the single triggering buy, or won a supermajority of disinterested holders.

Exam Tip: Gotchas

• The 85% calculation EXCLUDES shares owned by directors, officers, and certain ESOPs. A target with a large insider ownership stake is functionally harder to clear via the high-threshold-acquisition exception because the denominator shrinks.
• Default applies; companies opt OUT. The Delaware business combination statute is the baseline rule for Delaware corporations. Charter or bylaw amendments to opt out require shareholder approval and are uncommon.

Defense Comparison Table

Exam Tip: Gotchas

• The state statutes (control-share, fair-price, business-combination) apply only to NON-BOARD-SANCTIONED transactions. A friendly buy-side bid with board approval BEFORE the acquirer crosses the relevant ownership threshold avoids all three statutory traps. Diagnosing the impediment list is how the banker decides whether to approach the target board friendly first or go hostile.