skills/full-company-analysis/references/modules/M066-investment-memo-writing.md

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<!-- Module: 066 | Title: Investment Memo Writing -->

## PART XIV - RESEARCH COMMUNICATION AND MASTERY | MODULE 066

# Investment Memo Writing

> Mission. Write concise, decision-useful research that separates facts, assumptions, variant views, valuation, and risks.

## Decision output

Objective: Write concise, decision-useful research that separates facts, assumptions, variant views, valuation, and risks. The completed work product must be reproducible from evidence, show the downstream financial or decision effect when material, state the strongest contrary case, and define a dated update rule.

## Explicit operating procedure

1. Lead with the decision-relevant conclusion, variant perception, valuation range, key evidence, and what changes the view; do not force readers through chronology before the answer.

1. Label material statements as fact/source, management claim, analyst calculation, external estimate, or judgment when ambiguity could mislead.

1. Explain the business and industry in causal terms, then show forecast drivers and why they differ from market-implied expectations.

1. Present valuation with explicit scenarios, EV-to-equity bridge, sensitivities, and terminal/normalization assumptions rather than a target price without mechanics.

1. Give risks equal analytical quality: mechanism, leading indicator, exposure, and thesis-break condition.

1. Maintain a concise decision version and an evidence appendix/model that allows full audit without bloating the main narrative.

## Required evidence and model bridge

- Primary-source set: investment memo, evidence pack, model outputs, monitoring dashboard, review and automation logs. Preserve exact document/version, date, period, and source location for every material factual input used in investment memo writing.

- For each key concept - decision conclusion, business drivers, facts versus estimates, variant view, valuation bridge, risks - state whether it is a reported fact, analyst calculation, management claim, external estimate, or judgment. Quantitative concepts must retain raw components and units; qualitative concepts must retain the specific evidence and counterevidence.

- Map only economically relevant findings into the model or decision record. Process-control modules such as investment memo writing may have no direct valuation line; in that case document the downstream error or governance risk the control prevents.

## Metrics and calculation controls

| Metric / concept | Construction | Required validation |
| --- | --- | --- |
| claim traceability | % of material factual claims that link to a dated source, exact page/section, and model or memo location. | claim traceability: Audit a sample back to dated evidence and decision records; verify the stated threshold/score is reproducible by an independent reviewer and tied to a defined decision consequence. |
| thesis falsifiability | % of major thesis claims paired with a measurable future observation that would materially reduce confidence or invalidate the claim. | thesis falsifiability: Audit a sample back to dated evidence and decision records; verify the stated threshold/score is reproducible by an independent reviewer and tied to a defined decision consequence. |
| decision density | Number of decision-relevant conclusions, quantified implications, or action triggers per page/minute, excluding background description. | decision density: Reperform the count from the defined population, inspect every material exception, and confirm the denominator/universe did not change between periods. |



## Worked application

> Case: replace "huge TAM, best in class" with measurable expectations and evidence.

- Reconstruct the relevant reported fact from primary evidence before interpreting the case. For investment memo writing, show the raw components rather than only the resulting ratio or narrative.

- Build the causal chain through decision conclusion, business drivers, facts versus estimates, variant view, then identify which link is directly observed and which link remains an assumption.

- Calculate claim traceability, thesis falsifiability, decision density from sourced components under the reported/base interpretation and at least one skeptical alternative interpretation.

- Translate the difference between cases into the variable that matters for investment memo writing: evidence quality, revenue, operating profit/NOPAT, free cash flow, invested capital, financing/dilution, risk, or valuation. Mark non-applicable links instead of inventing them.

- Expert consistency test: make the bear case strong enough that a skeptic recognizes it.

- Precommit the specific future filing, KPI, customer/supplier observation, regulator action, or market input that would materially invalidate the investment memo writing conclusion.

## Failure tests

- FAIL if decision conclusion cannot be defined and reproduced from the source pack.

- FAIL if the reader cannot identify the thesis, variant view, key drivers, valuation range, downside, evidence quality, and what changes the view from the first two pages.

- FAIL if the investment memo writing conclusion depends on an unstated assumption, unreconciled definition, or evidence that cannot be traced to its source/version.

- FAIL if evidence materially inconsistent with the investment memo writing conclusion is omitted, reclassified, or dismissed without a documented definition, materiality, causal, timing, and source-quality analysis.

## Completion test

A senior reviewer must be able to reproduce the investment memo writing conclusion, vary the most sensitive assumption independently, trace the change through the model, understand the strongest opposing case, and identify the next evidence that would force an update. If any link is missing, the module remains open.