The Best Stock Screener for ESG and Impact Investors

An impact stock screener filters stocks by real-world ESG metrics rather than aggregate third-party ratings. It lets investors exclude companies that conflict with their values — fossil fuels, weapons, human rights controversies — and find companies that meet positive impact thresholds like strong climate action scores or verified net-zero commitments. Ziggma's free stock screener combines impact filters with financial quality scores so both dimensions are visible in the same view.

MSCI and Sustainalytics produce aggregate ESG ratings — a single score that blends dozens of factors into one number. The methodology is opaque and two companies can score identically for opposite reasons. Ziggma does not expose third-party ESG ratings. Instead it surfaces the underlying data: Global Warming Potential, carbon intensity across Scopes 1–3, net-zero target dates, CEO-to-median worker pay ratios, and harm-category exclusion flags. ESG and impact investing are not the same thing — Ziggma is built around the latter.

Ziggma partners with ACA Ethos for ESG and impact data. ACA Ethos covers 600+ metrics across climate action, resource use, fair labor, accountability, and controversy monitoring. Key data points include Scope 1, 2, and 3 carbon intensity, Global Warming Potential temperature alignment, net-zero target dates, renewable energy exposure, CEO-to-worker pay ratios, and fines per $M revenue. Data is updated monthly with daily controversy monitoring. Learn how Ziggma's impact data works →

The Ziggma Impact Score is a 0–100 composite rating of a company's overall ESG performance, powered by ACA Ethos data. It aggregates climate action, fair labor, accountable institutions, affordable healthcare, controversy levels, and privacy and data management into a single score. A score above 70 indicates strong positive impact. The Impact Score is one of the filter dimensions in the Ziggma screener and is also visible in the Portfolio Checkup for every holding in your connected accounts.

Yes. Ziggma's screener runs financial and impact filters simultaneously in real time. You can require a minimum Ziggma Score of 70 and a minimum Impact Score of 60 in the same screen, exclude fossil fuel companies, and filter for a net-zero target date — all at once. The Ziggma Stock Score covers valuation, growth, profitability, and financial health. Both financial and impact dimensions update the results instantly as you move the sliders.

The Fossil Fuel Free preset excludes companies with material revenue from oil, gas, and coal extraction or production. It is based on ACA Ethos harm-category data and applies as a single-click exclusion filter. Companies with incidental fossil fuel exposure — such as a conglomerate with a small legacy energy division — may still appear depending on the materiality threshold. For a step-by-step guide to building a portfolio with no fossil fuel exposure, see how to build a fossil-free portfolio.

Global Warming Potential (GWP) is the implied temperature alignment of a company's emissions — expressed in degrees Celsius of projected warming. A GWP of 1.5°C indicates alignment with the Paris Agreement target. A GWP of 3°C or higher signals material climate misalignment. In Ziggma's screener, you can set a maximum GWP threshold to filter out companies above your chosen warming level. GWP is also visible at the portfolio level in Ziggma's climate impact analysis, showing the aggregate temperature trajectory of all your holdings.

Ziggma's Metrics tab includes three complementary filters for net-zero screening: Net-Zero Target Date (a declared commitment), Global Warming Potential (the current emissions trajectory), and Carbon Intensity Change % (whether emissions intensity is improving year-over-year). A company with a 2040 net-zero target, a GWP below 2°C, and declining carbon intensity is a meaningfully stronger signal than a target date alone. See the full guide to screening for net-zero companies →

Most sustainable investing platforms focus on either stock screening or portfolio tracking — not both. Ziggma combines a full impact screener with portfolio-level climate analysis, a Portfolio Checkup, and multi-account aggregation in one tool. The screener covers 6,321 stocks with ACA Ethos impact data. The portfolio side shows Global Warming Potential, Impact Score, and Impact Distribution across every connected account. Compare the best platforms for sustainable investing →

Ziggma's free stock screener includes access to preset impact screens and basic financial filters. Full impact data — including ACA Ethos metrics, GWP sliders, carbon intensity filters, and net-zero target date filters — is available on paid plans. A 7-day free trial gives access to all features with no commitment. See Ziggma's pricing plans →