Quick facts
- Mechanism: the target makes a counter-bid for the acquirer
- Named after: the arcade game in which the pursued turns and eats its pursuers
- Decisive rule: 8 Del. C. § 160(c), cross-held shares lose their votes
- Practical effect: whoever reaches majority first neutralises the other
- Frequency: rare, and usually a negotiating posture rather than a plan
The Pac-Man defense answers a hostile bid by bidding for the hostile bidder. Both companies end up buying each other's shares at once, and the contest becomes a race rather than a siege.
It is the most theatrical defence in the catalogue and among the least used, for reasons that are partly financial and partly a single provision of Delaware law.
In plain English
Every other defence tries to make the target harder to swallow. This one tries to swallow the attacker.
If it works, the acquirer's own shareholders lose control of their company, and the executives who launched the bid are working for the people they attacked. If it fails, the target has spent an enormous amount of money buying shares in a company that is about to own it.
The rule that actually decides it
The interesting problem is not financial. It is what happens to the shares each side has bought in the other.
Delaware provides that shares of a corporation's capital stock "shall neither be entitled to vote nor be counted for quorum purposes" if those shares belong to the corporation itself, or to another corporation where a majority of the voting shares of that other corporation is held by the first.1
Work through what that means in a mutual bid. Suppose A is buying B, and B is buying A. The moment A secures a majority of B, B's holding in A becomes stock held by a majority-owned subsidiary. Those shares stop voting. B's entire accumulated position in A is instantly neutralised, no matter how much it cost.
The race is therefore winner-take-all, and it is decided by whoever crosses the majority line first. The loser is left holding a large, expensive, voteless block of the winner's stock.
That asymmetry is why the Pac-Man defence is credible mainly as a threat. Actually running it means betting the company on being faster.
Why it is so rarely completed
Cost. Both sides are buying at a premium simultaneously, usually with borrowed money, and the debt survives whichever outcome arrives.
Asymmetry of size. The defence is only available if the target can plausibly finance a bid for a company that was large enough to bid for it.
Regulatory delay. Two overlapping acquisitions in the same industry attract the same antitrust review, twice, and the timetable is not controlled by either party.
Fiduciary exposure. A defensive measure is judged under Unocal, which asks whether the board had reasonable grounds to perceive a threat and whether the response was "reasonable in relation to the threat posed."2 Committing the company's entire balance sheet to acquiring the bidder is a difficult response to describe as proportionate, particularly if the board's alternative was to accept a premium for shareholders.
It may be the wrong question entirely. If the company is going to be sold either way, the directors' role becomes that of "auctioneers charged with getting the best price for the stockholders at a sale of the company."3 A counter-bid does not obviously serve that duty. It replaces a decision about price with a contest about control.
What it is actually for
Read as a negotiating instrument rather than a plan, it makes more sense. A credible counter-bid changes the acquirer's calculation: their own shareholders now face risk, their own board has to respond, and their management is defending rather than attacking.
That is often enough to produce a negotiated outcome, which is usually what the target wanted. The defence succeeds by being announced, not by being completed.
What this means for a founder
There is no private-company version of this, and there is no reason to want one.
The transferable observation is about symmetry of pressure. Most negotiations where you feel cornered are structured so that only one party bears risk. The useful question is not how to escape, but what would make the other side's position uncomfortable too: a competing bidder, a walkable alternative, a deadline that hurts them as much as you.
A counter-bid is that instinct taken to its most expensive conclusion. The instinct is sound. The execution rarely is.
Related reading
- White Knight covers the cheaper way to change the bidder's calculation
- Poison Pill covers the defence that works without spending anything
- Tender Offer covers the mechanism both sides would be using
- Greenmail covers the other defence the market abandoned