For twenty years, the investment industry’s most sophisticated funds quietly used a better philosophy and methodology. The rest of the world largely ignored it. That is now over.
In 2025, Total Portfolio Approach crossed what innovation theorists call “the chasm” — the threshold at which an idea stops belonging to the brave few and starts belonging to the mainstream. Understanding why it happened now, and what it demands of asset owners, is one of the more important questions in institutional investment today.
What TPA actually is
Precision matters here, so let me be direct. TPA is an investment philosophy and methodology aligned to goals, that surfaces the best ideas through competition for capital, and builds in dynamism. One sentence.
But what it is not matters just as much. It is not a magic wand that makes unskilled teams skilful. It is not Tactical Asset Allocation, despite the word “dynamism” causing that confusion. And it is not a simple upgrade. The transition from Strategic Asset Allocation, the prevailing approach for decades, is genuinely hard. I have never suggested otherwise.
How we got here
To understand TPA, you have to go back. Harry Markowitz published his mean-variance analysis in 1952 and won the Nobel Prize in 1991. His work was genuinely modern when it emerged, but Modern Portfolio Theory is no longer modern. It is academically elegant, linear, and poorly suited to a world that operates as a complex system.
Markowitz’s framework carried an unintended consequence: what I call “physics envy” into the investment world — a preference for clean, tractable models over ones that reflect behavioural and systemic realities.
Gary Brinson was the other great catalyst, a titan of the industry I worked alongside when SAA became dominant in the 1980s. He crystallised a simple truth: asset allocation is important enough to be done very well. SAA delivered on that. But it also produced its own unintended consequences, principally a fixation on alpha at the expense of more fundamental questions about long-term value creation and resilience.
SAA’s limitations are structural. It relies too heavily on forecasting. It largely treats risk as a linear extension of the past. It doesn’t make much allowance for the journey taken by fund. Progress has been made, but the major limitations remain.
Roger presented TPA at a major conference on public asset management best practices and innovations co-organised by The World Bank Group Treasury with the Financial Analysts Journal / CFA Institute in Washington, D.C.
Watch the 30-minute presentation summary.
The innovators who came first
In the early 2000s, a number of organisations — CPP Investments, Future Fund, New Zealand Super, GIC — began doing something different.
At WTW, we were building the first OCIO mandates using TPA methodology, with the Merchant Navy Officers Pension Fund among the earliest in the UK. These were genuine innovators, doing it differently at a time when the methodology was less codified and the ecosystem less supportive.
Adoption remained slow. For roughly twenty years, TPA was admired by some and largely ignored by everyone else. It had to be stress-tested, codified, and proven at scale before it emerged. That process took time.
The clearest indication that the chasm has now been crossed is the CalPERS adoption.
The signal that changed everything
When Stephen Gilmore, formerly senior at Future Fund and Chief Investment Officer at New Zealand Super, took the reins at what is widely considered the world’s most difficult CIO role, the investment community watched closely.
He proposed a reference portfolio model: TPA’s distinctive way of approaching long-term risk, not as a benchmark but as a proxy for the fund’s underlying risk appetite. He credibly brought his board and stakeholders with him. The transition is set for July 2026.
CalPERS is the largest public pension fund in the United States. When an organisation of that visibility makes this move, it changes the conversation for everyone watching.
TPA is not one size
The methodology spans a spectrum — from a modestly adjusted version of SAA at one end, to the full-blown TPA practised by organisations like CPP Investments at the other.
Many funds operate successfully at intermediate levels, and hybrid approaches are performing well. You do not have to go all the way to capture significant benefits.
We have done substantial work to simplify and codify the adoption toolkit. Four core structural steps can unlock much of TPA’s value without requiring every element at once. But knowing where to enter the spectrum requires an honest cost-benefit analysis in each individual context.
Risk, governance, and the upgrade required
Adopting TPA also means rethinking risk. Traditional frameworks use the past as a proxy for the likely future, seen through the lens of probability.
But many of the most consequential risks facing asset owners today — climate system shocks being the most obvious — have no meaningful historical dataset. They have a future, not a past.
TPA’s more ambitious implementations are using correspondingly more sophisticated risk models: building on existing foundations, not discarding them. Think of it as a software update. New features and capabilities. Known bugs fixed.
Governance requires the same treatment. The decision-making architectures suited to SAA are not always well-suited to TPA’s faster, more dynamic context.
The most advanced TPA adopters are investing in governance evolution alongside their investment model evolution. One without the other tends not to hold.
The bigger picture
Asset owners — pension funds, sovereign wealth funds, endowments — are among the strongest actors influencing world affairs.
That system depends, in turn, on a well-functioning world. The alignment between better investment outcomes and better long-term stewardship of the systems that generate returns is not incidental to TPA. It is structural.
Much of traditional investing is zero-sum. What TPA offers, at its best, is something closer to macro-consistent wealth creation: better beta, you could also call it, better meta.
That is not merely a financial claim. It is a proposition about what the investment industry can do for a greater good.
The chasm has been crossed. The question now is not whether TPA deserves to be taken seriously. It is how seriously, and how soon.
This article derived from the presentation delivered by Roger Urwin, co-founder of Thinking Ahead, at a major conference organised by The World Bank Group Treasury with the Financial Analysts Journal / CFA Institute in Washington, D.C.
