Build a falsifiable stock thesis

The hardest part of investing is not finding ideas. It is remembering, eighteen months later, what you actually believed when you bought — and being honest about whether it happened. Memory is generous to itself. Writing is not.

A useful stock thesis states what the market may be missing, identifies the operating evidence that should close the gap, and defines what would prove the idea wrong. It is a testable decision record, not a prediction that the price will rise.

What to look at

• Variant view: state what you believe differently from the market.
• Business driver: connect the view to revenue, margins, cash flow, or per-share value.
• Evidence: name the result or catalyst that would support the view.
• Failure condition: write the measurable fact that would invalidate it.

The shape of it

Thesis = Variant view + Business driver + Evidence + Failure condition

An example

Example: recurring-revenue mix lifts operating margin faster than expected over the next four quarters.

Where people go wrong

“The stock looks cheap” is not a thesis unless you explain why earnings or cash-flow expectations are wrong.

A thesis you cannot falsify is not a thesis, it is a hope. The failure condition is the most valuable line in the whole document, and it is the one people most often leave out.