Company lists · Data refreshed September 2026
Top 25 Transparency and accountability nonprofits worldwide
RevenueBase identified 522 transparency and accountability nonprofits worldwide as of September 2026 and tracks 6,140 professional contacts across them, including 1,494 with verified work emails. The United States is the largest market and Washington the largest hub.
This list covers transparency and accountability nonprofits worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 22, 2026. Country and city lists for transparency and accountability nonprofits follow the table.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest transparency and accountability nonprofits worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 411 contacts → | ||||
Partial evidence “Transparency International is a global movement working in over 100 countries to end the injustice of corruption.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 2 | 401 contacts → | ||||
Partial evidence “We are a nonpartisan, nonprofit organization working to building a better government and a stronger democracy.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 3 | 217 contacts → | ||||
Indirect evidence “Common Cause is a nonpartisan, grassroots organization dedicated to restoring the core values of American democracy, reinventing an open, honest and accountable government that…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 4 | 195 contacts → | ||||
Partial evidence “Public Citizen is a nonprofit consumer advocacy organization that champions the public interest – your interests – in the halls of power.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 5 | 151 contacts → | ||||
Indirect evidence “Praja is a non-partisan organisation enabling accountable governance.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 6 | 149 contacts → | ||||
Indirect evidence “Our vision is a world in which people with power are accountable.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 7 | 127 contacts → | ||||
Partial evidence “The Public and Private Development Centre (PPDC) is a non-governmental organisation and social enterprise driven by the desire to have a more transparent and accountable…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 8 | 119 contacts → | ||||
Indirect evidence “Follow the Money is een journalistieke beweging met een glashelder doel: het blootleggen van financiële misstanden die schade toebrengen aan de samenleving.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 9 | 112 contacts → | ||||
Indirect evidence “We believe that a country’s natural resources belong to its citizens.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 10 | 73 contacts → | ||||
Strong evidence “Judicial Watch, Inc, a conservative, non-partisan educational foundation, promotes transparency, accountability and integrity in government, politics and the law.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 11 | 73 contacts → | ||||
Partial evidence “Transparencia por Colombia es una organización sin ánimo de lucro creada en 1998, cuya misión es "liderar desde la sociedad civil la lucha integral contra la corrupción y por la…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 12 | 70 contacts → | ||||
Strong evidence “Transparency International is a non governmental organization dedicated to increasing government accountability and curbing both international and national corruption.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 13 | 64 contacts → | ||||
Partial evidence “Founded in 1981, the Project On Government Oversight (POGO) is an independent nonprofit that investigates and exposes corruption and other misconduct in order to achieve a more…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 14 | 56 contacts → | ||||
Indirect evidence “We work with everyone to advance human rights in business.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 15 | 55 contacts → | ||||
Indirect evidence “OSB: atuação para formar, manter e fortalecer Observatórios Municipais O Observatório Social do Brasil (OSB), fundado em 2008, coordena o #SistemaOSB com mais de 3500 voluntários…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 16 | 53 contacts → | ||||
Indirect evidence “At CREW, we use aggressive legal actions, in-depth investigations, and innovative policy and reform work to achieve that vision.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 17 | 53 contacts → | ||||
Indirect evidence “Em 2019 o CPTI recebeu certificação internacional Phomenta de acordo com os padrões de transparência e boas práticas sociais.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 18 | 37 contacts → | ||||
Indirect evidence “Open Contracting Partnership aims to open up and transform public procurement to deliver fairer and better results for people, prosperity, and the planet.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 19 | 37 contacts → | ||||
Strong evidence “American Oversight is a nonpartisan, nonprofit watchdog that advances truth, accountability, and democracy by enforcing the public’s right to government records.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 20 | 37 contacts → | ||||
Indirect evidence “The Canadian Taxpayers Federation (CTF) is a federally incorporated, non-profit and non-partisan, advocacy organization dedicated to lower taxes, less waste and accountable…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 21 | 36 contacts → | ||||
Partial evidence “Captai, CataiCenter, Advocacy, transparency, initiative” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 22 | 36 contacts → | ||||
Indirect evidence “The Committee of Seventy has been called a "government watchdog,""the elections people" and a "think tank." We're all three and much more.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 23 | 34 contacts → | ||||
Indirect evidence “The Pearl Initiative is the leading independent, not-for-profit, private sector-led organisation working across the Gulf Region of the Middle East to influence and improve…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 24 | 32 contacts → | ||||
Strong evidence “The International Centre for Investigative Reporting is an independent, nonprofit news agency that seeks to promote transparency and accountability.” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
| 25 | 32 contacts → | ||||
Indirect evidence “The Movement for Quality Government in Israel (MQG) is an independent, non-partisan, grassroots, non-profit organization that has been defending Israeli democracy and promoting…” Source: RevenueBase Database · checked Sep 22, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: transparency and accountability nonprofits. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names transparency and accountability nonprofits.
- Partial evidence
- Its own public description names part of transparency and accountability nonprofits, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name transparency and accountability nonprofits. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 522 transparency and accountability nonprofits worldwide
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Transparency and accountability nonprofits worldwide at a glance
As of Sep 22, 2026Companies by employee count
Email recency is reported on each country list linked below.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among transparency and accountability nonprofits, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- Coverage
- Every country. Country and city lists for transparency and accountability nonprofits are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “transparency and accountability nonprofits”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names transparency and accountability nonprofits), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among transparency and accountability nonprofits, and records with no verified work email.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 1,494 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 22, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Transparency and accountability nonprofits by location
2 lists · largest firstEvery Transparency and accountability nonprofits list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names transparency and accountability nonprofits, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many transparency and accountability nonprofits are there worldwide?
RevenueBase identified 522 transparency and accountability nonprofits worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Transparency International, headquartered in Berlin, tops this list with the largest team on record.
Which country has the most transparency and accountability nonprofits?
The United States leads with 118 companies, followed by India (33). Every transparency and accountability nonprofits list by country and city is linked on this page.
Which city has the most transparency and accountability nonprofits?
Washington leads with 29 headquartered companies, followed by London (11) and Nairobi (9).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,494 verified decision-maker contacts tracked across these 522 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 22, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.