Most people buy stocks the same way they buy lottery tickets.
They hear a name. A friend mentions it. They see it trending on Twitter. The price looks cheap. Something feels right. They tap buy — and hope for the best.
Then the price drops 20% and they have no idea whether to hold, sell, or buy more. Because they never actually knew why they bought it in the first place.
An investment thesis solves this problem.
In plain English — what is a thesis?
A thesis is simply your written answer to one question:
Not "it looks cheap." Not "everyone is talking about it." A specific, honest argument for why this particular business is mispriced by the market — and why you believe that gap will close.
A real example — Sanlam (SLM on the JSE)
Here's what a bad reason to buy looks like:
Here's what an investment thesis looks like:
Same stock. Completely different level of thinking.
Why does writing it down matter?
First — it forces clarity. You cannot write a vague thesis. The moment you try to put it in writing, you discover whether you actually understand the business or not.
Second — it protects you when the price drops. Every stock drops at some point. Without a thesis, a price drop feels like a crisis. With a thesis, you can ask one question: Has anything changed in the business, or just the price?
Third — it teaches you over time. Every thesis you write becomes a record of your thinking. When a trade goes wrong, you can go back and see exactly where your reasoning failed.
The E&A Compass rule
In Compass, the rule is simple: no thesis, no trade. You cannot log a position without writing your reason. Not because we want to make your life harder — but because the discipline of writing it is exactly where the value is.
A thesis doesn't need to be long. It doesn't need to use fancy financial terms. It just needs to be honest, specific, and yours.