Company lists · Data refreshed September 2026

Top 25 Esg compliance consulting firms based in the United States

Name: Esg compliance consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 1,646 companies tracked

RevenueBase identified 1,646 esg compliance consulting firms headquartered in the United States as of September 2026 and tracks 15,015 professional contacts across them, including 6,497 with verified work emails. New York is the largest hub.

This list covers esg compliance consulting firms headquartered in the United States, 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 28, 2026.

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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

1,646Companies

15,015Contacts tracked

6,497Verified emails

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The 25 largest esg compliance consulting firms based in the United States

Ranked by team size

Top 25 of 1,646 esg compliance consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to esg compliance consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Apex Companies	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,137 contacts →
	Indirect evidence “Who is Apex?” Source: RevenueBase Database · checked Sep 28, 2026
2	Antea Group USA	Partial evidence	St Paul, MN, United StatesHQ checked Sep 28, 2026	1,001-5,000	658 contacts →
	Partial evidence “Antea Group is an international engineering and environmental consulting firm specializing in full-service solutions in the fields of environment, health and safety, and…” Source: RevenueBase Database · checked Sep 28, 2026
3	Comply	Partial evidence	New York City, NY, United StatesHQ checked Sep 28, 2026	201-500	308 contacts →
	Partial evidence “At Comply, we pride ourselves on being the champion for compliance professionals.” Source: RevenueBase Database · checked Sep 28, 2026
4	Metiri Group	Indirect evidence	Clovis, CA, United StatesHQ checked Sep 28, 2026	n/a	233 contacts →
	Indirect evidence “Appl Inc is an environmental services company based out of 908 N Temperance Ave, Clovis, CA, United States.” Source: RevenueBase Database · checked Sep 28, 2026
5	August Mack Environmental, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 28, 2026	51-200	210 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
6	Keramida INC	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 28, 2026	51-200	152 contacts →
	Partial evidence “Founded in 1988, KERAMIDA is a multidisciplinary Sustainability, EHS & Engineering consulting firm grounded in evidence-based research and development.” Source: RevenueBase Database · checked Sep 28, 2026
7	Optima Partners	Strong evidence	NY, United StatesHQ checked Sep 28, 2026	51-200	145 contacts →
	Strong evidence “Established in 2014, Optima is a leading global regulatory compliance and cybersecurity consulting firm advising financial institutions, including investment managers, hedge…” Source: RevenueBase Database · checked Sep 28, 2026
8	STOK	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	51-200	141 contacts →
	Indirect evidence “Stok leads organizations to decarbonize now.” Source: RevenueBase Database · checked Sep 28, 2026
9	Mostardi Platt	Indirect evidence	Elmhurst, IL, United StatesHQ checked Sep 28, 2026	51-200	140 contacts →
	Indirect evidence “Since the passage of original environmental legislation nearly four decades ago, both private and public industry have turned to Mostardi Platt for guidance in complying with air…” Source: RevenueBase Database · checked Sep 28, 2026
10	Onepointfive Opf.Degree	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	11-50	133 contacts →
	Indirect evidence “At OnePointFive we solve your sustainability focused business challenges by empowering your organization with expert-led solutions, embedded training, and cutting edge tools to…” Source: RevenueBase Database · checked Sep 28, 2026
11	Risk & Regulatory Consulting LLC	Partial evidence	Farmington, CT, United StatesHQ checked Sep 28, 2026	51-200	122 contacts →
	Partial evidence “Risk & Regulatory Consulting, LLC is a leading, national professional services firm dedicated to providing exceptional consulting services to insurance regulators.” Source: RevenueBase Database · checked Sep 28, 2026
12	Esgauge	Indirect evidence	New York, United StatesHQ checked Sep 28, 2026	11-50	120 contacts →
	Indirect evidence “ESGAUGE is the help desk uniquely designed for the professional service firm seeking customized data on U.S.” Source: RevenueBase Database · checked Sep 28, 2026
13	The EI Group, INC	Partial evidence	Morrisville, NC, United StatesHQ checked Sep 28, 2026	51-200	111 contacts →
	Partial evidence “The EI Group, Inc.(EI) is an environmental, health and safety consulting firm headquartered in Research Triangle Park, North Carolina, with branch offices strategically located…” Source: RevenueBase Database · checked Sep 28, 2026
14	Cascadia Consulting Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 28, 2026	51-200	110 contacts →
	Partial evidence “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Source: RevenueBase Database · checked Sep 28, 2026
15	DFP Partners	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	51-200	110 contacts →
	Indirect evidence “For over 40 years, DFP Partners has been a committed ally to Broker-Dealers, Registered Investment Advisers, and other financial services firms looking for accounting and…” Source: RevenueBase Database · checked Sep 28, 2026
16	Hart & Hickman, PC	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 28, 2026	51-200	103 contacts →
	Partial evidence “Hart & Hickman PC provides environmental consulting services to commercial, industrial, and governmental clients throughout the Southeast US.” Source: RevenueBase Database · checked Sep 28, 2026
17	Citadel EHS	Partial evidence	Glendale, CA, United StatesHQ checked Sep 28, 2026	51-200	102 contacts →
	Partial evidence “Founded in 1993, Citadel EHS provides comprehensive environmental, health, safety, and sustainability consulting solutions to meet the needs of both the public and private sectors.” Source: RevenueBase Database · checked Sep 28, 2026
18	Tricord Consulting	Partial evidence	Frisco, TX, United StatesHQ checked Sep 28, 2026	51-200	102 contacts →
	Partial evidence “TRICORD Consulting, LLC is a leading firm of environmental, health, and safety (EHS) specialists that dedicate our engineering and technical talents to serving others first.” Source: RevenueBase Database · checked Sep 28, 2026
19	Chambers Group, INC	Partial evidence	Costa Mesa, CA, United StatesHQ checked Sep 28, 2026	51-200	98 contacts →
	Partial evidence “Public agencies and businesses have been relying on Chambers Group to keep them in compliance with applicable federal, state, and/or local environmental laws, regulations, and…” Source: RevenueBase Database · checked Sep 28, 2026
20	AKT Peerless	Indirect evidence	Saginaw, MI, United StatesHQ checked Sep 28, 2026	51-200	96 contacts →
	Indirect evidence “We are environmental consultants and redevelopment experts who are proud to help build sustainable communities.” Source: RevenueBase Database · checked Sep 28, 2026
21	Climeco	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	51-200	96 contacts →
	Indirect evidence “ClimeCo is an award-winning leader in decarbonization, empowering global organizations with customized sustainability pathways.” Source: RevenueBase Database · checked Sep 28, 2026
22	Accountability	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	11-50	92 contacts →
	Indirect evidence “AccountAbility is a global advisory and standards firm that serves business, investors, governments, and multi-lateral organizations.” Source: RevenueBase Database · checked Sep 28, 2026
23	Verdani Partners	Partial evidence	Carlsbad, CA, United StatesHQ checked Sep 28, 2026	51-200	89 contacts →
	Partial evidence “Verdani Partners is a full service sustainability consulting firm specialized in corporate sustainability, LEED certification and greening and retrofitting existing buildings.” Source: RevenueBase Database · checked Sep 28, 2026
24	Malk Partners	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	51-200	84 contacts →
	Partial evidence “Malk Partners is the foremost consultancy advising private equity firms to create and protect value through environmental, social, and governance (ESG) management.” Source: RevenueBase Database · checked Sep 28, 2026
25	Group14 Engineering, PBC	Partial evidence	Denver, CO, United StatesHQ checked Sep 28, 2026	11-50	75 contacts →
	Partial evidence “Group14 Engineering is a Denver-based consulting firm committed to inspiring better buildings where people thrive.” Source: RevenueBase Database · checked Sep 28, 2026

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: esg compliance consulting firms. 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 esg compliance consulting firms.
Partial evidence: Its own public description names part of esg compliance consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name esg compliance consulting firms. 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 1,646 esg compliance consulting firms based in the United States

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Esg compliance consulting firms based in the United States at a glance

As of Sep 28, 2026

43.3%Verified-email coverage

9.1Average contacts per company

1-10Median size (employees)

5.5%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

1,155

11-50

393

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,646 companies.

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 esg compliance consulting firms, 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “esg compliance consulting firms”. 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 esg compliance consulting firms), 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 esg compliance consulting firms, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 6,497 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 28, 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.

Esg compliance consulting firms by metro

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 esg compliance consulting firms, 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 esg compliance consulting firms are there based in the United States?

RevenueBase identified 1,646 esg compliance consulting firms headquartered in the United States 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?

Apex Companies, headquartered in Rockville, tops this list with the largest team on record.

Which city has the most esg compliance consulting firms?

New York leads with 91 headquartered companies, followed by Houston (46) and Chicago (37).

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 6,497 verified decision-maker contacts tracked across these 1,646 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 28, 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.