Lookalikes · Data refreshed November 2026

25 Efficacy Worldwide lookalikes

Compiled by the RevenueBase Data Team Data refreshed Nov 1, 2026 22317 matching companies

Looking for Efficacy Worldwide lookalikes, Efficacy Worldwide competitors or Efficacy Worldwide alternatives? The RevenueBase company graph holds 22317 companies that do what Efficacy Worldwide does, matched at 85%+ measured description similarity (RevenueBase, November 2026). The 25 largest are ranked below by team size; across all 22317 matches RevenueBase tracks 229,139 professional contacts, including 46,982 with verified work emails.

Similarity is measured on what companies actually do, from their business descriptions rather than industry codes, and is shown per row as a percentage. This page keeps only companies at 85%+ measured similarity to Efficacy Worldwide and ranks them by company size. Data current as of November 1, 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 Similarity shown on every row Refreshed Nov 1, 2026 Match quality audited by blind human judging

Reference company

Efficacy Worldwide

“We are a full-fledged ad agency company with over 100+ years of collective experience among all CXOs here.”

51-200Employees

50Contacts tracked

28Verified emails

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The 25 largest Efficacy Worldwide competitors and alternatives

Ranked by team size

Top 25 of 22317 companies matching Efficacy Worldwide at 85%+ description similarity, ranked by team size. Similarity is each company's measured match to Efficacy Worldwide (100% = identical). Data refreshed Nov 1, 2026.
#	Company	HQ	Employees	Similarity	Verified emails
1	IO	Herentals, BE	1,001-5,000	85%	989 contacts →
2	Digitas North America	Boston, US	1,001-5,000	87%	915 contacts →
3	Publicis	New York, US	1,001-5,000	86%	91 contacts →
4	Horizon Media	New York, US	1,001-5,000	86%	1,559 contacts →
5	Mccann Worldgroup	New York, US	10001+	86%	284 contacts →
6	Marketizon	London, GB	n/a	85%	1 contacts →
7	Informal	n/a	5,001-10,000	86%	1 contacts →
8	Schbang	Lower Parel Mumbai Maharashtra, IN	1,001-5,000	87%	570 contacts →
9	Serviceplan Group	Munich, DE	5,001-10,000	85%	710 contacts →
10	TBC	Baltimore, US	n/a	89%	59 contacts →
11	Hakuhodo INC	Tokyo, JP	1,001-5,000	85%	286 contacts →
12	FCB Global	New York, US	5,001-10,000	86%	35 contacts →
13	Brasil Monks	Sao Paulo, BR	1,001-5,000	90%	433 contacts →
14	IVE Group	Sydney, AU	1,001-5,000	86%	535 contacts →
15	Interactive Avenues	Mumbai, IN	501-1,000	87%	294 contacts →
16	TING	Mumbai, IN	501-1,000	88%	266 contacts →
17	Vertis Communications	Sussex, US	10001+	87%	29 contacts →
18	Linney	Mansfield, GB	1,001-5,000	85%	455 contacts →
19	Betc Havas	Sao Paulo, BR	501-1,000	86%	16 contacts →
20	Anything IS Possible	And Hove, GB	n/a	85%	53 contacts →
21	Precis	Stockholm, SE	201-500	89%	307 contacts →
22	Ogilvy UK	GB	501-1,000	85%	328 contacts →
23	Tombras	Knoxville, US	501-1,000	88%	365 contacts →
24	Hiveminds	Bengaluru, IN	201-500	88%	193 contacts →
25	Martin	Richmond, US	201-500	86%	242 contacts →

Showing the 25 largest of 22317 similar companies

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How similarity works

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.
Matching: Companies are matched on what they actually do, as described in their own business descriptions, never on shared industry codes. The list keeps only matches at 85%+ measured similarity to Efficacy Worldwide, and match quality is audited by blind human judging. Read the full methodology.
Ranking: Team size, largest first, among the matched companies: companies are ordered by the number of professionals RevenueBase tracks at each one. Each row also shows its measured similarity to Efficacy Worldwide as a percentage.
Verification: Contact records re-verify on a rolling cadence rather than being scraped once and left to decay; each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on November 1, 2026. Lists refresh periodically as the graph is re-checked.

Frequently asked

What are Efficacy Worldwide lookalikes?

Efficacy Worldwide lookalikes are companies that closely resemble what Efficacy Worldwide does and sells, based on each company's own business description. The table above ranks the closest matches by company size, with each company's similarity to Efficacy Worldwide shown as a percentage.

What companies are similar to Efficacy Worldwide?

The largest companies similar to Efficacy Worldwide are IO, Digitas North America, Publicis and Horizon Media. The table above shows the 25 largest of the 22317 matched companies, with each row's similarity shown as a percentage.

How is similarity measured?

Similarity scores how closely a company's business, as described in its own words, matches Efficacy Worldwide's, shown as a percentage (100% = an identical description). The list keeps companies at 85% or above and ranks them by team size.

How do I get contacts at these companies?

A free RevenueBase account lets you run this exact search and work the top matches, verified emails and direct dials included. Upgrading unlocks the 46,982 verified emails and direct dials tracked across all 22317 matched companies.

Who are Efficacy Worldwide's biggest competitors?

The largest Efficacy Worldwide competitors by measured business-description similarity are IO, Digitas North America, Publicis and Horizon Media. Every company here does what Efficacy Worldwide does at 85%+ similarity, ranked by team size.

What are the best Efficacy Worldwide alternatives?

The closest Efficacy Worldwide alternatives are the companies whose own business descriptions match Efficacy Worldwide's most closely, shown above with each one's similarity as a percentage and ranked by team size.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 1, 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.