PRI: Principles for Responsible Investment

What It Is

The Principles for Responsible Investment (PRI) is a United Nations-supported international network of investors working to implement six principles for incorporating environmental, social, and governance factors into investment practice. Launched in 2006 by then-UN Secretary-General Kofi Annan, PRI has grown from 100 founding signatories to 5,261 signatories with US$139.6 trillion in assets under management at the end of March 2025, according to its 2025 Annual Report.

PRI operates on the premise that ESG factors can affect the performance of investment portfolios and that incorporating them into investment analysis and decision-making is consistent with investors' fiduciary duties. The six principles are aspirational — signatories commit to working toward their implementation over time rather than achieving immediate full compliance.

PRI's influence extends beyond its signatory base. Through annual reporting and assessment, collaborative engagement initiatives (like Climate Action 100+), policy advocacy, and research, PRI shapes how the global investment industry approaches sustainability.

Who Uses It

• Asset managers — investment managers make up about three-quarters of signatories (4,018 of 5,261 in March 2025)
• Asset owners — pension funds, sovereign wealth funds, insurance companies, and endowments
• Service providers — investment consultants, research providers, and data firms
• Companies indirectly — PRI-signatory investors use their collective influence to engage companies on ESG performance

Key Requirements

The six Principles commit signatories to:

1. Incorporate ESG issues into investment analysis and decision-making processes — integrating ESG data into valuation models, portfolio construction, and risk assessment
2. Be active owners and incorporate ESG into ownership policies and practices — voting proxies on ESG issues, engaging with companies on ESG performance, filing shareholder resolutions
3. Seek appropriate disclosure on ESG issues by investee entities — requesting climate disclosure aligned with the ISSB's IFRS S2 (which carries forward the TCFD recommendations), supporting CDP, encouraging sustainability reporting
4. Promote acceptance and implementation of the Principles within the investment industry — advocating for ESG integration with peers, service providers, and regulators
5. Work together to enhance effectiveness in implementing the Principles — participating in collaborative engagement initiatives, sharing best practices
6. Report on activities and progress toward implementing the Principles — through PRI's mandatory reporting framework

PRI's Reporting and Assessment framework scores signatories' responses for peer benchmarking. Its 2025 version had 259 indicators across modules covering policy and stewardship, climate change, and asset-class-specific implementation. For 2026, PRI streamlined reporting to about 40 mandatory, scored questions organized around the six Principles and aligned with Pathways, a new framework for signatory progression that it launched in November 2025.

How to Implement

Phase 1: Commitment (1-2 months) Sign the Principles. Designate a responsible investment lead. Assess current ESG integration across investment processes and asset classes.

Phase 2: Policy Development (2-4 months) Develop or update responsible investment policy. Define ESG integration approach by asset class. Establish proxy voting guidelines incorporating ESG factors. Develop engagement policy and priorities.

Phase 3: Integration (3-12 months) Embed ESG data into investment analysis processes. Train portfolio managers and analysts on ESG integration. Select ESG data providers and tools. Develop ESG scoring or assessment methodologies.

Phase 4: Active Ownership (ongoing) Implement proxy voting on ESG resolutions. Engage directly with portfolio companies on material ESG issues. Participate in collaborative engagement initiatives (Climate Action 100+, Nature Action 100).

Phase 5: Reporting (annual) Complete PRI's annual reporting framework. Publish responsible investment report. Disclose proxy voting record.

Relationship to Other Frameworks

TCFD: PRI was instrumental in driving TCFD adoption by investors and in 2020 made TCFD-based climate indicators mandatory to report in its Reporting Framework. The TCFD disbanded in 2023, and its recommendations now live on in the ISSB's IFRS S2, the kind of disclosure Principle 3 asks signatories to seek from investee companies.

CDP: PRI collaborates with CDP and encourages signatories to use CDP data for ESG analysis and to request CDP disclosure from portfolio companies.

SBTi: PRI supports investor engagement with companies on science-based targets. The Net Zero Asset Managers initiative, led by six investor networks including PRI, began a review in January 2025 after some large asset managers left, and relaunched in February 2026 with an updated commitment anchored in the Paris Agreement's goals, signed by more than 250 asset managers.

PSI: PRI covers the investment side of financial institutions while PSI covers underwriting. Many insurers are dual signatories.

SDGs: PRI increasingly frames responsible investment in terms of SDG outcomes and real-world impact, moving beyond risk-return optimization.

Why It Matters

PRI matters because it represents the commitment of US$139.6 trillion in signatory assets (as of March 2025) to ESG integration. This concentration of investor influence shapes corporate behavior — companies seeking capital access, favorable cost of capital, and constructive shareholder relationships must respond to the ESG expectations that PRI signatories collectively express.

PRI's collaborative engagement initiatives demonstrate the power of coordinated investor action. Climate Action 100+, facilitated partly through PRI infrastructure, engages the world's largest corporate emitters on climate strategy and disclosure. Individual investors lack the leverage to change corporate behavior; organized investor coalitions can.

The framework's evolution reflects the broader maturation of responsible investment — from exclusion and negative screening toward integration, active ownership, and increasingly, real-world impact measurement. As regulatory requirements for investor climate disclosure grow (UK SDR, EU SFDR), PRI's reporting framework provides the infrastructure for systematic accountability.