Lookalikes · Data refreshed November 2026

25 Porter O'brien lookalikes

Compiled by the RevenueBase Data Team Data refreshed Nov 4, 2026 2894 matching companies

Looking for Porter O'brien lookalikes, Porter O'brien competitors or Porter O'brien alternatives? The RevenueBase company graph holds 2894 companies that do what Porter O'brien does, matched at 85%+ measured description similarity (RevenueBase, November 2026). The 25 largest are ranked below by team size; across all 2894 matches RevenueBase tracks 24,748 professional contacts, including 9,820 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 Porter O'brien and ranks them by company size. Data current as of November 4, 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 4, 2026 Match quality audited by blind human judging

Reference company

Porter O'brien

“Helping you shape policy, reputation and growth.”

11-50Employees

26Contacts tracked

20Verified emails

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The 25 largest Porter O'brien competitors and alternatives

Ranked by team size

Top 25 of 2894 companies matching Porter O'brien at 85%+ description similarity, ranked by team size. Similarity is each company's measured match to Porter O'brien (100% = identical). Data refreshed Nov 4, 2026.
#	Company	HQ	Employees	Similarity	Verified emails
1	CFC BIG Ideas	AE	n/a	85%	14 contacts →
2	Mercury Public Affairs, LLC	New York, US	51-200	90%	89 contacts →
3	CMM DE LA Calle, Madrazo, Mancera SC	Miguel Hidalgo, MX	n/a	86%	11 contacts →
4	DKC	New York, US	201-500	91%	155 contacts →
5	Berlinrosen, An Orchestra Company	New York, US	201-500	87%	192 contacts →
6	SKDK	Los Angeles, US	51-200	86%	153 contacts →
7	Portland	Paris, FR	201-500	86%	74 contacts →
8	DCI	Washington, US	51-200	88%	76 contacts →
9	Kreab España	Madrid, ES	51-200	87%	57 contacts →
10	Global Strategy Group	Hartford, US	51-200	86%	134 contacts →
11	TACT	Montreal, CA	51-200	89%	104 contacts →
12	Hanover Communications	London, GB	201-500	86%	131 contacts →
13	Finsbury Glover Hering	New York, US	501-1,000	90%	38 contacts →
14	Rational 360	Washington, US	51-200	85%	117 contacts →
15	Hanbury Strategy	Berlin, DE	51-200	86%	101 contacts →
16	Strategycorp	Ottawa, CA	51-200	90%	103 contacts →
17	Mcguirewoods Consulting	Columbia, US	51-200	88%	85 contacts →
18	ACTUM	New York, US	51-200	88%	88 contacts →
19	Public & Government Affairs At Edelman	Washington, US	201-500	86%	63 contacts →
20	Narrative Strategies	West Palm Beach, US	51-200	88%	107 contacts →
21	Aakhya India	New Delhi, IN	51-200	88%	67 contacts →
22	SEC Newgate Australia	Brisbane, AU	51-200	87%	90 contacts →
23	Acumen Public Affairs	Brussels, BE	51-200	88%	87 contacts →
24	LSG	Washington, US	51-200	87%	32 contacts →
25	Comin & Partners	Milano, IT	51-200	86%	71 contacts →

Showing the 25 largest of 2894 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 Porter O'brien, 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 Porter O'brien 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 4, 2026. Lists refresh periodically as the graph is re-checked.

Frequently asked

What are Porter O'brien lookalikes?

Porter O'brien lookalikes are companies that closely resemble what Porter O'brien 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 Porter O'brien shown as a percentage.

What companies are similar to Porter O'brien?

The largest companies similar to Porter O'brien are CFC BIG Ideas, Mercury Public Affairs, LLC, CMM DE LA Calle, Madrazo, Mancera SC and DKC. The table above shows the 25 largest of the 2894 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 Porter O'brien'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 9,820 verified emails and direct dials tracked across all 2894 matched companies.

Who are Porter O'brien's biggest competitors?

The largest Porter O'brien competitors by measured business-description similarity are CFC BIG Ideas, Mercury Public Affairs, LLC, CMM DE LA Calle, Madrazo, Mancera SC and DKC. Every company here does what Porter O'brien does at 85%+ similarity, ranked by team size.

What are the best Porter O'brien alternatives?

The closest Porter O'brien alternatives are the companies whose own business descriptions match Porter O'brien'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 4, 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.