Theme-Fit and Momentum Allocation Rule
Size thematic positions by combining causal fit with market momentum
- Difficulty
- Moderate
- Time to result
- ~weeks to results
- Steps
- 5
- Confidence
- 90%
The rule separates security eligibility from portfolio weight. A company first needs a defensible connection to the portfolio's theme, but thematic purity alone does not determine its allocation. Managers then assess whether market momentum confirms the opportunity and size positions more heavily when both factors align. A company with a moderate thematic connection but strong momentum may receive a larger position than a pure beneficiary whose price action is weak. Conversely, an eligible asset can be reduced or removed when momentum deteriorates, as described for crypto and gold. This creates an active portfolio in which holdings preserve the mandate while weights adapt to current market behavior. The approach also discourages investors from confusing a top-ten position with the strongest possible thematic exposure.
Origin
Michael Gayed used this rule to explain why the Free Market ETF's largest holdings do not always represent its purest deregulation plays. Extracted from Masters in Business.
Core principles
- 01Position size matters more than simple inclusion
- 02Theme relevance establishes eligibility
- 03Momentum determines whether eligible exposure should be heavier
- 04Weak momentum can justify reducing even thematically valid assets
- 05Portfolio weights should adapt rather than remain fixed
How to run it
- 1
Establish thematic eligibility
Confirm that the security has a credible connection to the portfolio theme. Record whether the connection is direct or indirect.
Pro tip Use the same evidence standard for every candidate.
Watch out Do not admit a security solely because it is performing well.
- 2
Score the causal fit
Evaluate how strongly the expected policy change could affect the company's costs, speed, growth, or margins. Distinguish strong beneficiaries from looser supporting exposures.
Pro tip Use a simple documented scale so the team can compare holdings consistently.
Watch out A high fit score does not guarantee favorable timing or returns.
- 3
Assess momentum
Apply a consistent momentum measure to determine whether the market currently confirms the thesis. Compare the result with relevant peers and the broader opportunity set.
Pro tip Use multiple horizons to avoid reacting to a single short-term move.
Watch out Chasing a sudden price spike can turn momentum confirmation into performance chasing.
- 4
Set the weight
Allocate more heavily when thematic fit and momentum are both convincing. Use smaller positions when only one dimension is strong.
Pro tip Define maximum weights and risk limits before evaluating individual names.
Watch out Do not assume the largest holding must have the highest thematic-fit score.
- 5
Monitor and rotate
Review momentum and causal fit regularly. Reduce or exit positions when either the market signal or thematic justification materially weakens.
Pro tip Record which condition triggered each allocation change.
Watch out Frequent changes without consistent rules can become discretionary noise.
In the wild
The fund mandate allowed limited exposure to bitcoin and ethereum as relatively unencumbered free-market assets. Although they fit the theme, the portfolio exited after momentum weakened rather than preserving the positions solely for conceptual consistency.
→ The portfolio retained thematic discipline while avoiding larger declines in weak positions.
A company passes the deregulation screen because permitting changes indirectly improve its operating environment. Its thematic fit is weaker than that of a bank facing direct regulatory relief, but strong and persistent momentum supports a larger tactical allocation within predefined limits.
→ Weight reflects both mandate relevance and current market confirmation rather than thematic purity alone.
Common mistakes
Equal-weighting every beneficiary
Qualifying for a theme does not mean every security carries the same conviction, timing, or risk. Weight should reflect the combined evidence.
Confusing momentum with theme fit
Strong performance cannot substitute for a credible thematic connection. Both tests must remain distinct.
Chasing early performance
Investors may buy after a sharp rise without considering whether momentum is durable or already extended.
Is it for you?
Best for
It is best for active managers who want thematic exposure while responding to changing market confirmation.
Not ideal for
It is not ideal for equal-weight, buy-and-hold, or purely fundamental mandates that prohibit tactical sizing.
From the transcript
“what you own matters a lot less than how much you own of it.”
“It could be just this deregulation fit and this strong momentum we want to be there.”
“It's obviously momentum has been weak, so we've gotten out of it.”
From the episode
At The Money: Deregulation Will Free Your Portfolio