Pre-Buy Thesis Review Checklist

What the pre-buy review is

The pre-buy thesis review is the final gate before committing capital to a new position. It is not a research session. It does not generate new analysis. Its function is to verify that research has already been organized into a testable thesis before the order is placed. The distinction matters: investors who use the review as a substitute for prior thesis construction end up doing their thesis work in the moments before they buy, which is precisely when cognitive bias toward the trade is highest.

The review consists of six gates. Passing all six gates does not guarantee a successful investment; no process can. It guarantees that the investor is entering the position with a complete and falsifiable thesis, a defined exit framework, a position size calibrated to conviction, and an identified reason why the opportunity exists. These elements do not produce returns directly. They create the conditions under which good research produces better decisions over time.

The review should be run in sequence. Gate 1 is a prerequisite for all subsequent gates. Gate 2 verifies falsifiability, which gate 3 depends on for assumption ranking. Gate 4 assumes gate 3 is complete. Gates 5 and 6 can be assessed in either order once gates 1 through 4 are passed. Failing any gate stops the review at that point. The investor completes the failed gate before continuing.

Gate 1: Thesis is complete

The first gate checks whether the five anatomy components of the thesis are all present in the written thesis document. A thesis is not complete if any of these five elements is missing:

• Core claim: A single sentence stating the specific expected outcome and when it is expected to occur.
• Market-gap argument: An explanation of why the security is currently mispriced or why the opportunity exists. This is the edge statement. Without it, the investor has identified something interesting but has not identified a reason to expect above-market returns from acting on that observation.
• Key assumptions: The set of claims that must be true for the thesis to be correct, with each assumption assessed as load-bearing or supporting.
• Break conditions: Specific, observable conditions that would signal the thesis has failed, triggering exit or reassessment.
• Evidence threshold: The standard of evidence required before the investor concludes that a break condition has been triggered. This prevents premature exit on ambiguous data while ensuring that a genuine violation is not rationalized away.

If any of these five components is absent from the written thesis, gate 1 fails. The investor completes the missing element before moving to gate 2. A partial thesis is not a basis for opening a position at any size.

Gate 2: Thesis is falsifiable

Gate 2 verifies that the thesis is falsifiable in practice, not just in principle. A thesis can have a break condition written in it that is effectively unfalsifiable because it is stated too vaguely to be triggered by any specific observable event. Gate 2 checks against this.

Three requirements must all be satisfied to pass gate 2:

1. At least one specific falsifier is named. "The thesis fails if the business does not perform" is not a falsifier. "The thesis fails if gross margins do not recover to above 42% by the end of fiscal Q4" is a falsifier. The difference is observability: the second statement could be checked against an earnings release.
2. Time frame is defined. The expected outcome must be associated with a specific date or date range. Falsifiers must be checkable at a specific time, not whenever enough data has accumulated to form a view.
3. Evidence threshold is specific. The investor should be able to state, before the position is opened, what level of evidence would be sufficient to conclude a break condition has been met. A single quarterly miss may not be sufficient. Three consecutive quarters of margin compression below a stated threshold may be. The threshold should be written before the position, not determined in the moment.

The additional check at gate 2 is whether the falsifier is different from a price decline. Price is a symptom. A thesis that can only fail by losing money does not have a falsifier; it has a stop-loss. Stop-losses and falsifiers serve different functions. A falsifier speaks to the mechanism of the thesis, not to the market's current valuation of it.

Gate 3: Key assumptions identified and ranked

Gate 3 checks the assumption hierarchy. A thesis that has identified assumptions but has not ranked them by importance cannot function as a monitoring framework. The investor needs to know which assumptions are load-bearing and which are supporting, because the response to a failed assumption depends entirely on that classification.

Three conditions must be met to pass gate 3:

1. Load-bearing assumptions are distinguished from supporting ones. Each assumption in the thesis is classified as one or the other, using the damage test: if this assumption is wrong, does the thesis fail completely (load-bearing) or weaken (supporting)?
2. Each load-bearing assumption has a corresponding break condition. Gate 2's falsifiers should map directly to the load-bearing assumptions from gate 3. If a load-bearing assumption has no break condition that would be triggered if it fails, that assumption is not being monitored.
3. The top two assumptions are identified as the primary monitoring targets. These are the two assumptions whose failure would be most damaging and whose status will receive the most attention during the monitoring phase of the investment.

Gate 3 failure is common even among investors who complete gate 2 successfully. It is possible to have a specific falsifier that is not clearly connected to any identified load-bearing assumption. When that happens, the falsifier is operating in isolation from the assumption structure rather than as part of a coherent framework. Gate 3 ensures the connection is explicit.

Gate 4: Position size rationale matches conviction and risk

Gate 4 checks the relationship between the thesis and the proposed position size. A thesis with a high conviction score and a small proposed position, or a thesis with a low conviction score and a large proposed position, both fail gate 4 for different reasons.

Three conditions must be met to pass gate 4:

1. Position size is proportional to thesis conviction score. The conviction score is the investor's assessment of how strong the thesis is, based on gates 1 through 3. A thesis that passed all three gates with clear, specific elements at each stage warrants a larger position than one that barely passed with thin specificity.
2. The maximum loss at current position size is explicitly calculated and accepted. At the proposed position size, what is the largest realistic loss if the thesis is wrong? Is that loss acceptable within the portfolio's overall risk budget? If the investor has not calculated this, gate 4 fails.
3. The risk is consistent with portfolio-level risk limits. No single position should have the potential to produce a loss that exceeds the portfolio's stated single-position risk limit. This check requires knowing both the potential loss on this position and the risk limit that applies to it.

Gate 5: Sell rules written before buying

Gate 5 checks that specific, written sell rules exist before the position is opened. Sell rules are the enforcement mechanism for the thesis's break conditions. A break condition that is not connected to a specific, pre-written action is a break condition that will be rationalized away under pressure.

Three conditions must be met to pass gate 5:

1. At least one break condition is written. This should already be satisfied if gate 2 was passed. Gate 5 checks that the break condition is connected to an explicit action rather than existing only as a monitoring standard.
2. At least one time-horizon review date is scheduled. The thesis time horizon, established as part of the thesis anatomy, should be represented as a calendar entry: a specific date on which the investor will formally review the thesis against its original predictions.
3. The action to take when a break condition triggers is written explicitly. "Exit the position" is acceptable. "Reduce to half position and reassess within 30 days" is acceptable. "Reassess" alone is not acceptable, because it is not an action; it is a deferral. The sell rule should specify what happens, not just that something happens.

Gate 6: Edge identified

Gate 6 checks whether the investor has articulated a specific reason why this is an opportunity rather than simply a good company. The distinction is critical for expected return. A great company at a fair price does not offer an investment edge. An average company at a significant discount to assessed value does. The edge is what the investor believes the market has wrong, underweighted, or not yet recognized.

Three conditions must be met to pass gate 6:

1. A specific reason is articulated for why this is an opportunity. "This is a great business" is not an edge. "The market is pricing this business as a cyclical commodity producer, but the recent contract restructuring has locked in 70% of revenue for 5 years, making it a much more predictable cash flow business than the current multiple reflects" is an edge.
2. The market-gap argument is present and not circular. "This stock is undervalued because the market undervalues it" is circular. The market-gap argument must identify a specific reason for the mispricing: information the market does not have, a time horizon mismatch between the investor and the market, a complexity discount, or a structural reason the security is not in the typical institutional buyer's universe.
3. The edge is not simply "I think this is a good company." Good companies are widely recognized as good companies. If the edge is quality recognition, that quality must already be either unrecognized or mischaracterized by the market, and the investor must be able to say specifically why.

What to do if you fail a gate

Failing a gate means not opening the position until that gate is addressed. This is the point of the checklist. The gates are not procedural formalities to be completed on the way to a decision already made. They are quality control checkpoints, each of which represents a specific type of preparedness that correlates with better decision-making over time.

The most common response to a failed gate is rationalization: the investor decides the gate does not really apply to this particular thesis, or that the missing element is implied rather than stated, or that the specific situation is exceptional. None of these responses constitute passing the gate. The gate either passes or fails on its stated criteria.

When a gate fails, the appropriate response is to complete the missing element and re-run the gate. If the missing element cannot be completed because the information needed to complete it does not yet exist, that is itself important information: the thesis is not ready for capital, regardless of how compelling the opportunity looks.

The discipline of the pre-buy review is not in the gates themselves. It is in the investor's willingness to treat a failed gate as a hard stop rather than an administrative obstacle. Investors who treat the review as a formality will pass all six gates on nearly every trade. Investors who treat the review as a genuine quality control step will occasionally fail a gate and delay or cancel a planned trade. The second group is the one the checklist is designed to help.

Frequently asked questions

References

• Investment Thesis Lab
• Swoopr Research Workbench
• Swoopr Research Methodology