Tillinghast Alpha-by-Subtraction Method
Build an edge by matching your method, competence, and holdings
- Difficulty
- Advanced
- Time to result
- ~months to results
- Steps
- 5
- Confidence
- 96%
The method begins with self-knowledge: identify whether momentum, growth, or valuation is the process you can execute with a genuine edge. Next, restrict decisions to a circle of competence where future economics can be assessed with reasonable confidence. The portfolio is then improved through subtraction rather than indiscriminate idea generation. Investors exclude dishonest managers, poor capital allocators, strategically incoherent companies, chronically unprofitable operations, and businesses unable to withstand adversity. Temporary cyclical losses may be acceptable, but persistent losses and repeated “one-off” expenses are warning signs. The output is a smaller eligible universe whose members are understandable, resilient, and run by credible people. If no defensible edge remains after applying these filters, the method explicitly recommends passive indexing instead.
Origin
Extracted from Masters in Business during Joel Tillinghast's explanation of the recurring practices behind his long-term outperformance at Fidelity.
Core principles
- 01Use only an investment process that fits your abilities.
- 02Admit when indexing is better than active management.
- 03Stay inside industries whose futures you can reasonably assess.
- 04Avoid dishonest or strategically incompetent management.
- 05Exclude structurally unprofitable and fragile businesses.
- 06Create alpha by preventing avoidable losses.
How to run it
- 1
Identify Your Native Process
Decide whether your repeatable edge comes from momentum, growth analysis, valuation, or a deliberate combination. Specify what you do that the market does not already do better.
Pro tip Write the decision rule in one sentence before evaluating securities.
Watch out If you cannot identify an edge, active investing may be the wrong approach.
- 2
Draw the Competence Boundary
List the industries whose economics and five-year outlook you can assess. Exclude fields where technical, regulatory, or commercial outcomes cannot be credibly handicapped.
Pro tip Use specialist colleagues or external expertise without pretending their process is reproducible by you.
Watch out Familiarity with an industry is not the same as forecasting competence.
- 3
Screen Management Quality
Investigate honesty, strategy, and capital allocation. Remove businesses led by promoters, dishonest operators, or executives who repeatedly destroy capital.
Pro tip Compare management statements across several meetings and reporting periods.
Watch out Low valuation does not compensate for fabricated accounts or reckless leadership.
- 4
Separate Temporary from Structural Losses
Determine whether unprofitability reflects a temporary cyclical low or a persistent business-model defect. Exclude companies with long histories of losses and recurring adjustments.
Pro tip Review profitability over a full cycle rather than one quarter.
Watch out Repeatedly relabeled nonrecurring costs are usually recurring economics.
- 5
Test Resilience
Assess barriers to entry, pricing power, balance-sheet strength, demand durability, and downside survivability. Retain only businesses capable of enduring plausible shocks.
Pro tip Ask what could permanently impair the company rather than merely depress one year's earnings.
Watch out A cheap but fragile business can erase years of otherwise successful selections.
In the wild
An investor finds a Russell 2000 company trading below peers but discovers years of losses, recurring adjusted expenses, weak competitive barriers, and no credible route to positive cash flow. Rather than treating the discount as an opportunity, the investor excludes it and directs research toward a profitable competitor with stronger management and resilience.
→ The portfolio avoids a structurally weak company whose apparent cheapness depended on optimistic adjustments.
Tillinghast recognized that he could not reliably handicap the progression from clinical trials to commercialization in biotech. Fidelity had a capable specialist, but he did not confuse recognizing her expertise with possessing the same process himself.
→ He avoided making unsupported forecasts outside his circle of competence.
Common mistakes
Confusing Cheapness with Quality
A low valuation is not sufficient when management is dishonest, profitability is structurally absent, or the business cannot survive adversity.
Borrowing Someone Else's Competence
Seeing that another investor's method works does not mean you can reproduce the analysis or execute it under pressure.
Treating Every Loss as Cyclical
Persistent unprofitability and repeated adjustments often indicate defective economics rather than a temporary downturn.
Is it for you?
Best for
It is best for active investors who can research companies deeply and enforce disciplined exclusions.
Not ideal for
It is not ideal for investors without the time, skill, or informational advantage required for security analysis.
From the transcript
“The first is knowing yourself and knowing what method works for you.”
“You add alpha by avoiding businesses that are run by crooks.”
“And the fourth point was to eliminate the companies that are not resilient”
From the episode
Joel Tillinghast on Fidelity Investments
Joel Tillinghast