Beginner Guide
Getting Started with ESG Investing
A primer on what ESG scores measure, why they differ across providers, and how institutional investors integrate them into allocation decisions.
12 min readRead
Knowledge Hub
Everything you need to master ESG
Guides, framework explainers, a practitioner glossary, webinar recordings, and full API documentation — all free.
Featured guides
Practical, no-hype analysis written by our research team.
Regulatory
Navigating CSRD: A Practical Handbook
Step-by-step guidance on the Corporate Sustainability Reporting Directive — who is in scope, what ESRS topics must be covered, and how to prepare.
18 min readRead
Framework Comparison
GRI vs SASB vs ISSB: Choosing the Right Standard
A decision framework that helps teams select, combine, or reconcile the three most widely used ESG reporting standards — with a sector-by-sector matrix.
15 min readRead
Due Diligence
Identifying Greenwashing: A Due Diligence Checklist
Twenty questions analysts should ask before accepting an ESG self-disclosure at face value — with real-world examples and red-flag patterns.
10 min readRead
Portfolio
Building a SFDR PAI-Compliant Reporting Process
How to collect, aggregate, and disclose the 18 mandatory Principal Adverse Impact indicators required under SFDR Article 8 and Article 9 funds.
20 min readRead
Data & API
Integrating ESG Data into Quant Models
Practical patterns for ingesting ESG scores alongside financial data — handling missing values, normalising across sectors, and avoiding look-ahead bias.
14 min readRead
Framework library
Quick-reference cards for all 10 frameworks openESG scores against — with links to the official standard and our scoring methodology.
GRI
Global Reporting Initiative
Comprehensive impact disclosures for economy, environment & people
Learn moreSASB
Sustainability Accounting Standards Board
Industry-specific, financially material metrics
Learn moreTCFD
Task Force on Climate-related Financial Disclosures
Governance, strategy & risk for climate risk
Learn moreCSRD
Corporate Sustainability Reporting Directive
EU double-materiality regulation aligned to ESRS
Learn moreISSB
International Sustainability Standards Board
IFRS S1 & S2 baseline for capital markets
Learn moreCDP
Carbon Disclosure Project
Investor-grade climate, forests & water questionnaires
Learn moreUN SDGs
UN Sustainable Development Goals
Mapping corporate programs to global outcome targets
Learn moreSBTi
Science Based Targets initiative
1.5°C-aligned decarbonisation pathway validation
Learn morePRI
Principles for Responsible Investment
ESG integration, stewardship & transparency expectations
Learn moreUN GC
UN Global Compact
Ten principles on human rights, labour & environment
Learn moreESG Glossary
Plain-English definitions for the terms that matter most.
Double Materiality
The principle that companies should assess both how sustainability issues affect the business (financial materiality) and how the business affects society and the environment (impact materiality). Required under CSRD/ESRS.
PAI — Principal Adverse Impacts
Eighteen mandatory ESG indicators that SFDR Article 8 and 9 funds must disclose, covering GHG emissions, biodiversity, water, social, and governance dimensions.
ESG Integration
The systematic and explicit inclusion of ESG factors in investment analysis and portfolio construction, as distinct from exclusion screening or impact investing.
Scope 3 Emissions
Indirect greenhouse gas emissions that occur in a company's value chain — both upstream (suppliers) and downstream (product use, end-of-life). Often the largest share of a company's climate footprint.
Stewardship
The process by which investors exercise their rights as shareholders — voting, engagement, and escalation — to promote long-term sustainable value creation.
SFDR
The EU Sustainable Finance Disclosure Regulation. Requires financial market participants to classify funds as Article 6 (no ESG claim), 8 (promoting ESG characteristics), or 9 (sustainable investment objective).
Greenwashing
The practice of making misleading, unsubstantiated, or exaggerated claims about a company's environmental or social performance, whether intentional or through poor disclosure discipline.
Impact Investing
Investments made with the intention to generate positive, measurable social and environmental impact alongside a financial return, typically requiring evidence of additionality.
Upcoming webinars
Regulatory28 Jan 2026
CSRD Year One: Lessons from Early Reporters
A panel of sustainability officers and analysts review what the first wave of CSRD-compliant reports reveals — and what gaps remain.
Data & API12 Feb 2026
Quant ESG: Building a Factor Model with openESG Data
A live walkthrough of ingesting ESG scores via API, normalising across sectors, and back-testing a simple ESG tilt strategy.
Research5 Mar 2026
Greenwashing Detection in Practice
Our research team walks through five real-world greenwashing cases — how we spotted them, how the market reacted, and what investors missed.
API Documentation
Full OpenAPI 3.0 reference, authentication guide, rate-limit details, example requests in cURL, Python, and JavaScript, and a Postman collection.
# Python example
import openesg
client = openesg.Client(api_key="sk-...")
company = client.companies.get("TSLA")
print(company.composite_score) # 61
print(company.pillars.environmental) # 54
print(company.greenwashing_flags) # 2The ESG Analyst — our weekly briefing
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