The Twenty-Year Investment Approach
Evaluate investments across complete cycles instead of reacting to short-term noise.
- Difficulty
- Advanced
- Time to result
- ~ongoing to results
- Steps
- 5
- Confidence
- 97%
The Twenty-Year Investment Approach aligns portfolio decisions with the long duration of pension obligations. Bowen uses twenty years because such a span is likely to include bull and bear markets, recessions, wars, and speculative bubbles. Instead of letting a single favorable or unfavorable period determine judgment, the manager reports rolling twenty-year results, creating multiple overlapping tests of performance. This makes it harder to cherry-pick dates and gives long-lived investment theses time to work. Individual holdings can remain in the portfolio for decades when their fundamentals and thematic rationale persist. The method does not ignore risk; it evaluates skill and durability across the full variety of environments a long-term investor is likely to encounter.
Origin
Extracted from Masters in Business, where Jay Bowen described the horizon used to manage the Tampa firefighters and police pension assets.
Core principles
- 01Match the evaluation horizon to the investor's actual obligations.
- 02Expect every long horizon to contain adverse and favorable regimes.
- 03Judge managers across complete cycles rather than isolated years.
- 04Let sound holdings compound while their long-term thesis remains intact.
- 05Use rolling periods to avoid cherry-picked start and end dates.
How to run it
- 1
Match the horizon to the obligation
Estimate how long the investor must support its beneficiaries or financial goals and select an evaluation horizon consistent with that duration.
Pro tip For a pension, relate the horizon to the typical beneficiary's service and retirement timeline.
Watch out Do not adopt a long horizon to excuse a strategy that no longer has a valid thesis.
- 2
Include complete market regimes
Choose a period long enough to encompass expansions, recessions, bull markets, bear markets, and disruptive events.
Pro tip List the regimes covered by each evaluation window.
Watch out A manager assessed only during a favorable regime has not received a complete test.
- 3
Measure rolling periods
Calculate overlapping long-term returns rather than relying on one inception-to-date number.
Pro tip Add a new rolling period to the review every year.
Watch out A single start date can flatter or punish performance arbitrarily.
- 4
Compare like with like
Evaluate returns against suitable benchmarks and the fund's liability requirements over the same period.
Pro tip Use net returns so fees do not disappear from the comparison.
Watch out A benchmark that does not reflect the portfolio's risk mix can produce misleading conclusions.
- 5
Revalidate holdings without imposing arbitrary deadlines
Keep holdings while their fundamentals and long-term rationale remain sound, even after substantial appreciation.
Pro tip Separate thesis reviews from reactions to daily price movements.
Watch out Long-term ownership must not become an excuse for ignoring deteriorating fundamentals.
In the wild
At each October fiscal-year review, Bowen presented another rolling twenty-year performance period. The accumulated record eventually included twenty-five distinct twenty-year sets, each showing strong relative performance across different combinations of market conditions.
→ Trustees could assess the manager through repeated full-cycle tests rather than one selectively chosen history.
The Tampa portfolio still contained remnants of positions originally purchased in 1974, including companies connected to Coca-Cola and Procter & Gamble. The positions remained because the strategy did not impose automatic sales after a stock doubled or tripled.
→ Durable businesses were allowed to compound across decades.
Common mistakes
Judging a manager by one year
A short period may reflect the current regime more than the manager's ability to navigate varied conditions.
Cherry-picking inception dates
One favorable starting point can exaggerate skill, while rolling periods reveal consistency more honestly.
Treating patience as permanent inaction
A long horizon still requires regular validation of fundamentals, valuation, and the investment thesis.
Is it for you?
Best for
It is best for pensions, endowments, and patient investors with liabilities or goals extending over decades.
Not ideal for
It is not ideal for investors who need near-term liquidity or cannot tolerate interim drawdowns.
From the transcript
“they take a twenty year investment. They really do”
“there hadn't been a twenty year period that has not included a bull market and a bear market, and a recession, and a speculative bubble…”
“We never just sell it just because it's doubled, tripled”
From the episode
Jay Bowen Discusses Pension Fund Management
Jay Bowen