Stepwise Conviction Sizing
Earn portfolio weight through repeated evidence, not first impressions
- Difficulty
- Moderate
- Time to result
- ~months to results
- Steps
- 5
- Confidence
- 94%
Stepwise Conviction Sizing treats portfolio weight as the result of accumulated evidence. An interesting company may enter as a tiny position, preserving contact with management and encouraging ongoing observation without pretending that early curiosity equals conviction. The investor first screens the peer group to define what a strong business should look like, then compares candidates against that standard. Position size rises in stages only after repeated management meetings, consistent statements, continued financial performance, and evidence that the company is genuinely superior rather than merely representative of its sector. This creates a progression from awareness to informed confidence and, only in exceptional cases, concentration. The framework also permits several small sector holdings to serve as benchmarks, improving comparative judgment while limiting the cost of early analytical errors.
Origin
Extracted from Masters in Business as Joel Tillinghast explained why his Fidelity fund held hundreds of stocks and how small positions developed into larger holdings.
Core principles
- 01Treat a tiny holding as a live research connection.
- 02Increase weight only when evidence and conviction strengthen.
- 03Assess management consistency across multiple interactions.
- 04Compare candidates against relevant peers.
- 05Concentrate only in demonstrably superior businesses.
How to run it
- 1
Define the Sector Standard
Describe the financial, strategic, and managerial traits a strong company in the sector should possess. Use those traits for a preliminary peer-group sort.
Pro tip Include both operating metrics and risk behavior in the standard.
Watch out Without a benchmark, a merely average company can appear exceptional.
- 2
Establish a Tracking Position
When a company is interesting but conviction is limited, begin with a tiny position rather than a full allocation. Treat it as a live research connection.
Pro tip Size it small enough that being wrong will not materially damage the portfolio.
Watch out A tracking position is not permission to skip preliminary research.
- 3
Test Management Consistency
Meet or study management repeatedly and compare promises, strategy, and explanations over time. Look for consistency without ignoring evidence of inflexibility or promotion.
Pro tip Record claims so later outcomes can be compared with the original language.
Watch out One polished meeting cannot establish integrity or execution skill.
- 4
Confirm Financial Delivery
Monitor whether operating and financial results support the original thesis. Compare performance with peers and the sector benchmark holdings.
Pro tip Use several reporting periods when possible.
Watch out Do not increase weight merely because the share price rises.
- 5
Scale with Earned Conviction
Increase the position in stages as evidence shows superior quality, reliability, and opportunity. Concentrate only when long-range earnings visibility and business quality are exceptional.
Pro tip State what new evidence justifies each increase.
Watch out Concentrating in an inadequately researched company magnifies analytical mistakes.
In the wild
An investor screens a broad group of banks, identifies the strongest candidates, and buys tiny positions in several as sector benchmarks. After multiple management interactions and several consistent reporting periods, one bank demonstrates better underwriting discipline and strategic clarity. The investor increases that position gradually while leaving the others small.
→ Portfolio concentration develops from comparative evidence rather than an initial hunch.
A newly listed company appears promising, but its management has little public track record. Instead of immediately assigning a large weight, the investor begins small, tracks execution, and waits for financial evidence before adding.
→ Uncertainty is preserved in the position size until the thesis is better supported.
Common mistakes
Jumping Straight to Full Size
A large first allocation converts an early hypothesis into major portfolio risk before management and results have been tested.
Adding on Price Alone
A rising share price does not establish that strategy, financial quality, or competitive superiority has improved.
Mistaking Diversification for Research
Holding many companies adds little value when the investor has not defined standards or compared them meaningfully.
Is it for you?
Best for
It is best for research-intensive investors who can monitor many companies and scale positions over time.
Not ideal for
It is not ideal for highly concentrated investors who cannot maintain or learn from small tracking positions.
From the transcript
“And if you don't have huge conviction, you want to have a tiny position.”
“Yeah, and I do that in steps.”
“You want to meet with management a few times, see if they're consistent.”
From the episode
Joel Tillinghast on Fidelity Investments
Joel Tillinghast