A thesis built from filings is a hypothesis, not a finding
A public equity fund had built a short thesis on an industrial company, meaning a case for betting that its share price would fall. The thesis came entirely from public filings, the reports a listed company must publish. The fund was deciding whether to take the position and how large to make it. Everything in the thesis was defensible on paper.
Public documents are complete and accurate, and they are written to be read a particular way. A thesis assembled from them can hold together and still rest on an assumption the industry would not recognize. That limit is invisible from inside the model, and nothing in the thesis had been described by anyone who actually worked in the industry.
We asked the question without revealing the answer
We wrote a discussion guide that asked practitioners to describe what they were seeing, and it deliberately did not disclose the thesis. That was the discipline that mattered. An expert who is told what you expect to hear will usually find a way to be helpful, and helpfulness is the opposite of what a test needs.
We ran expert calls with former operators, customers and former competitor leads. Sourcing was chosen on one test: would this person notice the effect the thesis predicted, if it were real? That is a different question from who has the strongest general view of the company. Competitor leads in particular had every reason to notice a rival under the pressure the thesis described. The calls happened ahead of the sizing decision.
The fund left the position off, on evidence
Practitioners described an industry situation materially different from the one the thesis assumed. None of them recognized the dynamic the model predicted. The fund left the position off, and it did so on evidence rather than on nerve.
The cost of the research was a rounding error against a short that would otherwise have been sized on a hypothesis the industry did not share. The analyst also kept the people. Understanding an industry properly has value beyond one thesis, and the next idea in the sector started from real knowledge of how it works.
