How to Define Your Own Strike Zone

Defining your strike zone is one of the most valuable things you can do as an investor — and one of the most commonly skipped. It requires a kind of honest self-assessment that's uncomfortable: working out not just what you think you know, but what you genuinely know well enough to act on.

The process has four steps. None of them is complicated. Together, they produce something most investors never have: a written set of criteria that tells you, in advance, what a compelling investment looks like to you.

1. Map Your Circle of Competence

   Start with industries and business models you know from the inside — not ones you follow in the news, but ones you understand structurally. What makes a good competitor vs. a weak one? What does pricing power look like in this industry? What are the realistic failure modes? If you can answer these questions without looking them up, you're in your circle.

2. Define Your Quality Criteria

   Within your circle, what does a great business look like? Most investors have implicit criteria they apply inconsistently. Making them explicit forces the question: is this company actually what I say I look for, or am I making an exception because the story is compelling? Common quality criteria include: durable competitive advantage, high returns on invested capital, owner-operator management, predictable free cash flow, and a business model that doesn't require reinvention every five years.

3. Set Your Price Threshold

   A great business at the wrong price is a poor investment. Your price threshold should express the minimum discount to your estimate of intrinsic value that justifies the risk of being wrong. This varies by business quality — a predictable compounder might warrant a small margin of safety, while a more cyclical business might need a larger one. The key is that you decide this before you're looking at a specific stock, not while you're excited about it.

4. Write It Down and Enforce It

   The final step is what separates investors who have a strike zone from those who think they have one. Write your criteria down in specific, testable terms. "Good management" is not a criterion. "Management with meaningful insider ownership and a track record of capital allocation decisions that match their stated priorities" is a criterion. Then enforce it — if a stock doesn't meet the criteria, it doesn't make the portfolio, regardless of how compelling the story sounds.

What Good Criteria Look Like

The most useful criteria are specific, binary where possible, and based on things you can actually evaluate. Vague criteria are easy to satisfy retroactively — specific ones aren't.

Here's the difference. A vague criterion: "good competitive position." A specific one: "pricing power demonstrated over at least two economic cycles, with gross margins that have been stable or expanding for 10+ years." You can look up the second one. The first one you can rationalise for almost anything.

Similarly, "interesting management" is unmeasurable. "Management has not issued dilutive equity for growth purposes in the last decade and has bought back stock opportunistically" is a clear standard you can verify.

The Circle of Competence Test

Most investors overestimate the size of their circle. They follow an industry, read the 10-Ks, and feel confident. But confidence and competence are not the same thing. The test is whether you can predict how a company will behave in adverse conditions — pricing wars, regulatory changes, technology disruption — not just whether you understand what it does today.

A useful exercise: for each industry you think you understand, write down three things that could permanently impair the competitive position of the best company in that industry. If you can't, you're following the industry, not understanding it.

How Strike Zone Makes This Practical

The hardest part of maintaining a strike zone isn't defining it — it's applying it consistently across thousands of stocks. Most investors with well-defined criteria still end up doing manual research on companies they could have ruled out immediately with a quick filter.

Strike Zone lets you encode your criteria — both the quantitative thresholds and the qualitative questions — and evaluate them systematically across a large universe of stocks. The AI does the reading you'd do yourself, asks the questions you'd ask, and surfaces only the companies that survive your full filter. Your strike zone, applied at scale.