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The 5-20 Rule

Your natural acquirer is usually 5 to 20 times your size: big enough to afford and absorb you, small enough that buying you still matters.

The Rule​

The 5-20 Rule is John Warrillow's shortcut for finding the buyers most likely to pay a premium for your company. Rather than chasing every conceivable acquirer, Warrillow argues you should concentrate on companies roughly five to twenty times your size. He states the heuristic plainly:

"The most likely buyer for your company is often 5 to 20 times the size of your business today."

Warrillow, The Art of Selling Your Business, ch. 8

The rule is a screening tool. It does not tell you who will buy, only where to spend your limited courtship energy when you build your target list.

Why the Band Has Two Edges​

The lower edge protects against buyers who cannot stomach the deal. A company only a little larger than yours may lack the cash, the financing, or the management depth to absorb you without choking. Acquiring you would be a bet-the-company move, which makes the buyer slow, anxious, and prone to lowball offers.

The upper edge protects against buyers to whom you are a rounding error. As Warrillow frames it, a company more than twenty times your size is large enough that buying you barely registers on its results. A giant has little reason to pay a premium or move quickly for an acquisition that will not move its own numbers. You become a low priority, easy to ignore and easy to renegotiate.

Inside the band, the math works for both sides. The buyer is large enough to afford and integrate you, yet small enough that owning you produces a visible lift. That combination is what makes a 5-20x acquirer willing to pay more than a financial buyer running a spreadsheet.

Using It to Build the List​

The rule earns its keep in the list-building stage of Warrillow's "Building Your Negotiating Leverage" section. Once you size the band, you can winnow a sprawling universe of names down to a workable shortlist of plausible strategic acquirers, then research each one's investment thesis for owning you.

This connects directly to the strategic premium: the buyers inside the 5-20x band are typically strategic acquirers whose existing assets become more valuable by owning yours. Warrillow ties the rule back to premium capture, noting that the goal is to quantify the buyer's gains and negotiate a slice of them, "especially against a 5-20x larger acquirer." A buyer in that range is large enough to harvest real synergies but still motivated to close, which is what gives you the leverage to claim part of the upside.

Limits of the Heuristic​

The 5-20 Rule is a starting filter, not a law. Warrillow presents it as a rule of thumb for narrowing a target list, and it should be combined with the rest of his leverage toolkit: positioning for acquirers, assembling a list broad enough to generate multiple offers, and understanding the different motivations of strategic versus financial buyers. Size tells you who can afford and absorb you. Fit, synergy, and competitive tension still decide who actually pays the most.

Further Reading​

Sources: Warrillow, The Art of Selling Your Business ch.8 (and ch.16 on strategic premium capture).