Company lists · Data refreshed September 2026

Top 25 Organizational development consulting firms based in New York, United States

Name: Organizational development consulting firms based in New York, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 2,030 companies tracked

RevenueBase identified 2,030 organizational development consulting firms headquartered in New York, United States as of September 2026 and tracks 33,638 professional contacts across them, including 16,053 with verified work emails. New York is the largest hub.

This list covers organizational development consulting firms headquartered in New York, 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

2,030Companies

33,638Contacts tracked

16,053Verified emails

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The 25 largest organizational development consulting firms based in New York, United States

Ranked by team size

Top 25 of 2,030 organizational development consulting firms based in New York, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names organizational development consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	Oliver WymanPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	5,001-10,000	8,230
	“At Oliver Wyman, a Marsh business, we bring deep industry insight, bold innovation, and a collaborative approach that cuts through complexity to help organizations navigate their…” Source: company website · checked Sep 5, 2026
2	StrategyIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	5,082
	“From strategy to execution.” Source: company website · checked Sep 5, 2026
3	AlixpartnersIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	3,583
	“For more than forty years, AlixPartners has helped businesses around the world respond quickly and decisively to their most critical challenges – circumstances as diverse as…” Source: company website · checked Sep 5, 2026
4	SEGALPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,149
	“Segal is a leading employee-owned consulting firm with more than 1,100 professionals across North America, including 150+ credentialed actuaries.” Source: company website · checked Sep 5, 2026
5	The Vertex Companies LLCStrong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	765
	“The Vertex Companies, LLC is a global consulting firm that provides strategic advisory, project management, and dispute resolution services for organizations that face complex…” Source: company website · checked Sep 5, 2026
6	CCS FundraisingPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	728
	“For over 75 years, CCS Fundraising has empowered many of the world’s greatest organizations to advance some of the most important causes in history.” Source: company website · checked Sep 5, 2026
7	Phronesis PartnersPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	337
	“At Phronesis Partners, we turn complexity into clarity for the world's leading organizations.” Source: company website · checked Sep 5, 2026
8	IndustriStrong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	n/a	292
	“Construction Sector/B2B Brand Strategy, Marketing & Business Development INDUSTRI® is a multi-faceted business development consultancy that focuses on key areas of an organization…” Source: company website · checked Sep 5, 2026
9	TCC GroupIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	n/a	232
	“TCC Group collaborates with leaders to solve complex social problems.” Source: company website · checked Sep 5, 2026
10	Bryant Park ConsultingIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	191
	“We champion a culture of innovation to help our clients build the future of business.” Source: company website · checked Sep 5, 2026
11	Essex Lake GroupIndirect evidence	New York, United StatesHQ checked Sep 5, 2026	201-500	183
	“Essex delivers transformative business solutions to major global corporations.” Source: company website · checked Sep 5, 2026
12	IVYIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	n/a	171
	“IVY is a coaching and learning partner for impact-focused CEOs and business leaders.” Source: company website · checked Sep 5, 2026
13	SypartnersPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	170
	“SYPartners is a transformation consultancy that helps leaders improve organizational performance by aligning vision, activating strategy, and building cultures of competitive…” Source: company website · checked Sep 5, 2026
14	CollinsIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	164
	“COLLINS is a transformation consultancy with offices in San Francisco and New York City.” Source: company website · checked Sep 5, 2026
15	Acquis Consulting GroupPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	150
	“Acquis is a different kind of management consulting firm.” Source: company website · checked Sep 5, 2026
16	ITACStrong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	n/a	150
	“ITAC is a leading consulting organization located in New York City.” Source: company website · checked Sep 5, 2026
17	Tefen Management ConsultingStrong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	122
	“Tefen is an international management consulting firm, committed to driving organizations towards achieving performance excellence.” Source: company website · checked Sep 5, 2026
18	August LeadershipIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	116
	“We solve talent leadership challenges.” Source: company website · checked Sep 5, 2026
19	Wert&coIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	n/a	105
	“Wert & Co.” Source: company website · checked Sep 5, 2026
20	VivaldiIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	102
	“Vivaldi is a global business reinvention firm comprised of growth strategists, innovators, visionary technologists, and disruptive creatives.” Source: company website · checked Sep 5, 2026
21	MKDAIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	93
	“MKDA is a corporate planning and interior design firm with vibrant studios in New York, Stamford and Miami.” Source: company website · checked Sep 5, 2026
22	MESAIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	11-50	90
	“A radically efficient approach to work.” Source: company website · checked Sep 5, 2026
23	Next StreetIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	85
	“For more than 20 years, corporations, governments, and philanthropies have hired Next Street to strengthen the small businesses they rely on.” Source: company website · checked Sep 5, 2026
24	Reference PointPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	83
	“Reference Point is a strategy, management, and technology consulting firm focused on delivering impactful solutions for the financial services industry.” Source: company website · checked Sep 5, 2026
25	CCA Inc.Partial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	77
	“CCA helps clients improve organizational and individual performance.” Source: company website · checked Sep 5, 2026

Showing 25 of 2,030 organizational development consulting firms based in New York, United States

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Organizational development consulting firms based in New York, United States at a glance

As of Sep 5, 2026

1-10Median size (employees)

New YorkLargest hub · 2030 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

1,598

11-50

325

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for New York, over 2,030 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 organizational development consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in New York, United States whose own description of what they do matches “organizational development consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among organizational development consulting firms, and records with no verified work email. Companies headquartered outside New York 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 an evidence 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, 16,053 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 5, 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.

Organizational development consulting firms by metro in the United States

Frequently asked

How many organizational development consulting firms are there based in New York, United States?

RevenueBase identified 2,030 organizational development consulting firms headquartered in New York, 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?

Oliver Wyman, headquartered in New York, tops this list with the largest team on record.

Which city has the most organizational development consulting firms?

New York leads with 2030 headquartered companies, followed by Chicago (1259) and Atlanta (1253).

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 16,053 verified decision-maker contacts tracked across these 2,030 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 5, 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 SmartSearch, 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.