The stage-zero filter. Before a name enters the watchlist at all, the investor writes one sentence answering: why is this name on the list? Examples: "family member's frequent purchase, want to evaluate the underlying business"; "screened on EV/EBIT below 7x with returns on capital above 15%"; "thematic — water infrastructure tailwind from EPA rule". A name without a stage-zero sentence does not enter the list. Names without stage-zero sentences are the leading source of watchlist hoarding.
| Watchlist hygiene practice | What it produces | Time cost |
|---|---|---|
| Stage-zero sentence per name at entry | Forces the investor to know why each name is on the list | 30 seconds per name |
| Quarterly retirement review | Removes names whose stage-zero reason no longer applies | 1 hour per quarter for a 50-name list |
| Cap on list size (commonly 30-60 for retail) | Forces ranking and prevents passive accumulation | Imposed at retirement review |
| Separate "actively diligencing" sublist of 3-5 names | Concentrates limited attention on the next plausible actions | Promoted from main list at quarterly review |
| Kill log of retired names with reason | Catches the case where you re-add a name you already killed | Two lines per kill |
Worked example — a retail investor's clean 32-name watchlist (after a quarterly retirement that dropped from 78). Stage-zero sentences range from "customer of mine" to "screened on FCF yield above 8%" to "recommended by a trusted friend in the industry". Three names are flagged for the actively-diligencing sublist this quarter. Of the 46 names retired, the kill log notes: 14 "stage-zero reason expired (no longer in industry)", 12 "price ran past plausible entry without me", 8 "newer evidence contradicts the original framing", 7 "I have not been able to articulate a thesis in two quarters of trying", 5 "acquired or delisted". The investor now has time to actually work on the 32 surviving names — which is more than enough at retail-attention budgets.
Signal-to-noise is the dominant constraint, not coverage breadth. A name on a screening output is a signal of low informational value; the screen had no view about whether the multiple is low for a real reason or because the business is failing. Names from primary observation — a customer of a product, a frequent visitor to a chain of stores, an employee or former employee of an industry — carry higher initial signal because they come bundled with context the screen does not have. Weight sourcing channels accordingly.
Sit with the ideas.
A retail investor's watchlist has grown to 180 names over two years of reading and screening. She acts on roughly six positions per year. Which of the following is the strongest sign her sourcing is unhealthy?