What is the PRI?
The Principles for Responsible Investment (PRI) turned 20 in May 2026. The anniversary was marked with ceremonies across the world’s largest stock exchanges, including the ringing of the Australian Securities Exchange (ASX) bell in Sydney in front of a packed room of superannuation funds, asset managers and company board directors. It was a fitting moment for an organisation with deep Australian roots as its founder, James Gifford, developed the idea during an internship with the United Nations (UN) in 2006 while completing a PhD at the University of Sydney, and three of the PRI’s leaders to date have been Australian.
Two decades on, the PRI’s signatory base has grown from a handful of founding investors to approximately 5,000 organisations representing US$139.6 trillion in assets under management. This article explains what the PRI is, what its six principles require, and what signatory status means in practice for Australian institutional investors today.
What the PRI Is
The PRI is a UN-supported international network of investors established in 2006. Its purpose is to help investors understand the implications of Environmental, Social and Governance (ESG) issues for investment portfolios, and to support them in incorporating those issues into investment decision-making and ownership practices. It operates under the conviction that ESG factors can affect the performance of investment portfolios, and that investors have a duty to act in the long-term best interests of their beneficiaries.
The PRI is not a regulator. Membership is voluntary, and the principles themselves are aspirational rather than prescriptive. What the PRI provides is a framework, a reporting structure, a global peer network, and, increasingly, a signal to the market about an organisation’s commitment to responsible investment practice.
The PRI is supported by the UN Environment Programme Finance Initiative (UNEP FI) and the UN Global Compact, both of which hold seats on its board. It is governed by its signatory base and funded through membership fees.
The Six Principles
The six Principles for Responsible Investment are:
- We will incorporate ESG issues into investment analysis and decision-making processes.
- We will be active owners and incorporate ESG issues into our ownership policies and practices.
- We will seek appropriate disclosure on ESG issues by the entities in which we invest.
- We will promote acceptance and implementation of the Principles within the investment industry.
- We will work together to enhance our effectiveness in implementing the Principles.
- We will each report on our activities and progress towards implementing the Principles.
The language of these principles (ESG integration, active ownership, stewardship, disclosure) has become embedded in the Australian institutional investment sector over the past decade. For most major superannuation funds and asset managers, these concepts are now fundamental to how they describe their investment approach, regardless of PRI membership.
Signatory Growth
The growth of the PRI’s signatory base over its 20-year history is a core examples of voluntary uptake in financial services. At launch in 2006, the PRI had a small group of founding signatories. It took six years to reach 1,000 signatories. From there, growth accelerated sharply, reaching 3,000 by 2019, 4,000 by 2021, and approaching 5,500 by 2024, with 5,345 signatories recorded at the end of March 2024.
Signatory growth has now levelled off in developed markets, where saturation is approaching. The PRI has noted this explicitly, shifting its focus toward growing the signatory base in emerging markets, where it already has 640 signatories spanning 46 countries across Asia, Sub-Saharan Africa, Latin America, Central and Eastern Europe and the Middle East, representing US$12.4 trillion in assets under management.
The assets under management (AUM) represented by PRI signatories (US$139.6 trillion) can be compared with total global professionally managed AUM, which reached a record high of US$147 trillion as of June 2025, according to industry data. The implication is that PRI signatories collectively represent the substantial majority of the world’s professionally managed assets. Comparisons of this kind require some care, as the definitions of AUM used across different sources are not always equivalent, but the directional point is clear: PRI membership now encompasses the preponderance of the global institutional investment industry.
What PRI Membership Requires
To become a PRI signatory, an organisation must have a responsible investment policy that covers more than 50% of its assets under management, senior-level oversight and accountability for responsible investment implementation, and staff who implement the responsible investment policy in practice.
Signatories are required to report annually on their responsible investment activities through the PRI’s Reporting Framework. The 2026 Reporting Framework represents a significant change from prior years as the number of questions has been reduced from approximately 240 to around 40, reflecting the PRI’s recognition that the previous framework placed a substantial administrative burden on signatories. The streamlining is a deliberate attempt to focus reporting on what matters most, rather than on comprehensiveness for its own sake.
Having recently completed the 2026 PRI survey, the reduction in question volume is noticeable. The survey is considerably quicker to complete. What is also clear is that the remaining questions carry significantly more weighting and are directly trying to get to the heart of each topic. A question on proxy voting, for example, is framed to reveal the actual depth of an investor’s engagement with the practice i.e. not simply whether a policy exists, but how mature and considered the implementation is. That shift in approach is worth noting for signatories who may assume a shorter survey means a less rigorous one.
PRI in the Australian Context
Australia has a particularly strong connection to the PRI, both historically through its founding and practically through the size and maturity of its institutional investment sector. The superannuation system with approximately A$4 trillion in assets, is one of the largest pools of retirement savings in the world relative to the size of the economy, and its trustees have long-dated investment horizons that make ESG integration a natural fit.
PRI signatory status is now a baseline expectation in the Australian institutional investment market. It is regularly requested in investor due diligence questionnaires, and it would be unusual to encounter a major Australian institutional investor that is not a PRI signatory.
At the RIAA annual conference in Melbourne in June 2026, Australian investors reaffirmed their commitment to responsible investment despite the US-led backlash against ESG, with RIAA co-Chief Executive Estelle Parker noting that “across most jurisdictions, ESG investing and sustainable finance are on an upward trajectory.”
Our View
The PRI’s 20th anniversary is meaningful! What began as a voluntary framework developed by a small group of investors in 2006 has become the defining infrastructure of responsible investment globally. The fact that its signatories now represent the substantial majority of professionally managed assets is a reflection of how thoroughly the framework has been adopted globally.
In practice, PRI signatory status has shifted from a differentiator to a baseline expectation. The more meaningful question for institutional investors today is not whether they are a signatory, but how well they are actually implementing the six principles. The PRI’s move to a more focused, higher-weighted reporting framework is a signal that the organisation itself recognises this shift. A shorter survey that asks harder, more substantive questions about proxy voting maturity, ESG integration depth and active ownership practice is a more useful instrument than a long checklist that can be completed at a surface level.
Over the next five years, the PRI’s most important role is likely to be less about growing its signatory base and more about raising the quality of implementation among existing signatories. We also predict that the PRI will try to grow its research arms to provide a responsible investment lens to niche investment sectors or new and emerging investment ideas such as carbon markets, cryptocurrency and systematic investing.
Sources
- Principles for Responsible Investment (PRI), About the PRI, unpri.org
- PRI, 2026 Reporting Framework, unpri.org
- PRI, Signatory General Meeting Minutes, March 2024, public.unpri.org
- PRI, Australia Responsible Investment Ecosystem Ways of Working Agreement, April 2026, unpri.org
- Investment Magazine, PRI Turns 20 as Responsible Investment Enters a Contested Era, May 2026, investmentmagazine.com.au
- Responsible Investment Association Australasia (RIAA), Annual Conference, Melbourne, June 2026
- Thinking Ahead Institute, World’s 500 Largest Asset Managers AUM Report, November 2025, thinkingaheadinstitute.org
- PwC, 2025 Global Asset and Wealth Management Report, pwc.com
- Grokipedia, Global Assets Under Management, citing BCG data, June 2025
- Robeco Australia, Principles for Responsible Investment (PRI), robeco.com/en-au
Anabranch ESG Advisory provides independent advice on ESG strategy, climate disclosure, and sustainability reporting. The information in this article is general in nature and does not constitute legal or financial advice.
