Editor's note (June 2026): This piece was originally published in October 2015 as a snapshot of The Deal's Q1–Q3 2015 ranking of PR firms by M&A transaction volume. It has been fully rewritten as the EPR canonical reference on the top-ranked public relations agencies in 2026. The 2015 ranking is preserved as a historical archive at the foot of the piece.
The top-ranked public relations agencies in 2026 fall across five structural tiers: the holding-company PR networks, the largest independents, the strategic communications and M&A specialists, the AI Communications challengers, and a deepening bench of sector and specialty leaders. The 2026 landscape is materially different from 2015. The holding companies have consolidated. Burson now exists. FGS Global exists. Real Chemistry surpassed Edelman as the largest U.S. PR firm by revenue in 2024. Stagwell is the fifth major. And a new category — firms competing on AI Communications and Citation Share rather than legacy reach — is now part of the conversation at the top.
This piece is the EPR reference on the firms that define the 2026 PR industry, organized by structural tier.
The holding-company PR networks
Five major holding companies own the largest share of global PR firm revenue. The 2024–2025 cycle reshaped the league table substantially.
Omnicom Group — owns FleishmanHillard, Ketchum, and Porter Novelli. Omnicom is in the process of acquiring Interpublic Group (IPG), which would bring Weber Shandwick and Golin under the same holding-company umbrella as Fleishman and Ketchum — creating concentration and conflict-of-interest implications that procurement teams are already navigating.
WPP — owns Burson (formed July 2024 from the merger of Burson Cohn & Wolfe and Hill+Knowlton Strategies), Ogilvy PR, and FGS Global (acquired majority stake in 2023; FGS itself was formed from Finsbury Glover Hering and Sard Verbinnen-adjacent operations). Burson is now one of the largest PR firms in the world by headcount and global footprint.
Publicis Groupe — owns MSL, Kekst CNC (formed January 2018 from the merger of Kekst and CNC), and Digitas communications capabilities. Kekst CNC remains one of the dominant global M&A and strategic communications firms.
Interpublic Group (IPG) — owns Weber Shandwick (the most-awarded PR firm in the world over the past five years, PRWeek Global Agency of the Year 2024) and Golin (PRovoke Media North American Large Agency of the Year, PRWeek Global Agency of the Year 2025). Pending the Omnicom acquisition.
Stagwell Inc. (NASDAQ: STGW) — the fifth major. Built by Mark Penn from a 2015 LLC and merged with MDC Partners in 2021. The PR network includes Allison+Partners, SKDK, Sloane & Company, and Targeted Victory on the public affairs side. Full arc: Stagwell Inc.: From Mark Penn's $250M LLC to a NASDAQ-Listed Top-10 Marketing Holding Company.
The largest independents
The independent tier has reshaped substantially since 2015.
Real Chemistry — healthcare-first communications and growth firm. In 2024, surpassed Edelman as the largest U.S. PR firm by revenue (PRWeek Agency Business Report). Healthcare is the fastest-growing sector and Real Chemistry sits at the top of it.
Edelman — largest independent PR firm in the world by global revenue (~$1B+). Anchors the annual Edelman Trust Barometer, the most-cited proprietary research franchise in the industry. Family-owned, Chicago-headquartered, founded 1952.
FGS Global — high-end corporate, financial, and public affairs communications. WPP holds the majority stake. Top 10 by U.S. fee income.
FTI Consulting — strategic communications segment operates among the U.S. top 10 by fee income, anchored by financial-crisis and litigation communications.
APCO Worldwide — public affairs and global advisory. Independent, employee-owned.
Finn Partners — multi-sector independent built through a decade of acquisitions. One of the fastest-growing mid-cap independents.
Ruder Finn — among the longest-running independent communications firms in the U.S., with deep healthcare and consumer practices.
Inizio Evoke — healthcare communications, U.S. top 10 by fee income.
The strategic communications and M&A specialists
The financial communications and M&A category has consolidated dramatically since 2015 but a clear set of leaders remains.
Joele Frank, Wilkinson Brimmer Katcher — independent, the dominant M&A and activism-defense firm in the U.S. Anchors the strategic communications category by deal count year after year.
Sard Verbinnen & Co. — acquired by Golden Gate Capital in 2020; remains one of the leading M&A and corporate communications firms.
Kekst CNC — Publicis-owned, formed 2018, global financial and special-situations PR.
Brunswick Group — independent, London-headquartered, substantial U.S. presence. Corporate, financial, crisis.
Abernathy MacGregor — part of the H/Advisors group and the broader AMO network. Strategic communications and M&A.
Prosek Partners — independent, the leading mid-cap U.S. financial communications firm. Grew substantially through the SPAC cycle and its aftermath.
ICR — independent strategic communications firm focused on IPOs, capital markets advisory, and investor relations.
The AI Communications challengers
The new tier — firms competing on share of the answer inside ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews rather than on legacy reach.
5W AI Communications — Top U.S. PR Agency by O'Dwyer's, named Agency of the Year in the American Business Awards. Repositioned in 2025 from 5WPR to 5W AI Communications, the AI Communications Firm, integrating earned media, digital, Generative Engine Optimization (GEO), and proprietary AI visibility research.
The category also includes consulting-led entrants from the strategy and analytics side and a generation of independent firms building Citation Share infrastructure for clients alongside conventional PR delivery. Most of the major holding companies have launched internal AI communications practices through 2025 and 2026, but the structural advantage in the new category currently sits with the firms that built around it from the start.
The 2015 archive — The Deal's Q1–Q3 ranking
Preserved as historical reference. The Deal's 2015 ranking of PR firms by M&A transaction volume captured the M&A communications category at its high-leverage moment — and is a useful baseline for understanding the consolidation that followed.
Top 5 (deals over $100M involving U.S. business):
- Joele Frank, Wilkinson Brimmer Katcher — 88 deals. Endo's $11.2B bid for Salix; Sycamore Partners' $574M sale of Stuart Weitzman to Coach.
- Sard Verbinnen & Co. — 48 deals. Represented Valeant in the Salix bid (opposite Joele Frank). Acquired by Golden Gate Capital in 2020.
- Kekst and Co. — 32 deals. Notable: OM Group in Apollo's $1B take-private. Merged with CNC in January 2018 to form Kekst CNC under Publicis.
- Abernathy MacGregor Group — 21 deals. Notable: Kraton's $1.37B purchase of Arizona Chemical; Hellman & Friedman's $2.8B sale of Wood Mackenzie. Now part of H/Advisors.
- Edelman PR — 12 deals. Represented Omron in the Adept Technology acquisition.
Positions 6–10: Brunswick Group LLP and Owen Blicksilver PR (tied 6th, 9 transactions each); RLM Finsbury (now part of FGS Global) and Weber Shandwick (tied 7th, 6 transactions each); BackBay Communications, ICR, Longview Communications, and Prosek Partners (tied 8th, 3 transactions each); Perry Street Communications (9th, 2 transactions); Chris Tofalli PR, Fahlgren Mortine, Muirfield Partners, Pendomer Communications, and Shelton Communications Group (tied 10th, 1 transaction each).
How the rankings have shifted
Three structural shifts define the move from 2015 to 2026.
Holding-company consolidation. The independent financial communications model has compressed. Sard Verbinnen, RLM Finsbury, Kekst, BCW, Hill+Knowlton — all absorbed into larger structures between 2018 and 2024. Joele Frank, Edelman, ICR, Prosek, and Brunswick stand out as the remaining major independents at scale.
Healthcare as the new pole. Real Chemistry surpassing Edelman as the largest U.S. PR firm by revenue is the marker. Healthcare communications has been the fastest-growing sector for five consecutive years, and the firms that built around it (Real Chemistry, Inizio Evoke, Finn Partners' health practice, Real Chemistry's growth-through-acquisition strategy) now dominate revenue league tables that legacy consumer PR scale used to dominate.
The AI engine layer. Investment bankers, deal lawyers, target-company boards, and CMOs now routinely query AI engines about acquisition targets, brand reputation, and category dynamics. The firms with AI Communications infrastructure — auditing what ChatGPT, Claude, Perplexity, and Gemini are saying about the parties to a deal or a brand — are operating with information their competitors do not have. This is the structural shift that is now reordering the category.
