H Advisors

What H Advisors does

H/Advisors is a global strategic communications and advisory consultancy operating as a wholly owned subsidiary of Havas Group (controlled by Vivendi). Founded in 2001 as /amo, the firm rebranded to H/Advisors in June 2026 after operating as H/Advisors Abernathy in the US. The firm employs 1,500+ experts across 40+ offices in 20+ countries, with headquarters in London and regional hubs in New York, Brussels, Paris, and Singapore. H/Advisors serves boards, senior executives, investors, governments, and large enterprises across nine practice areas: Corporate Communications, Crisis & Reputation Management, M&A & Shareholder Activism, Investor Relations & Financial Communications, Public Affairs & Policy Advisory, Litigation Advisory, Sustainability & ESG, Transformation & Change, and Data/Digital & Creative Strategy.

The firm generates revenue through professional services fees structured as project-based engagements, monthly retainers, and transaction-linked mandates for M&A and IPO advisory work. Go-to-market is exclusively direct senior-level enterprise field sales, with new client acquisition driven by senior relationship management, thought leadership content (including the 'Leading without a landing' global leadership study and 'Behind The Narrative' podcast), industry conference presence (e.g., SuperReturn Berlin), and referrals from existing board-level relationships. There is no self-serve, product-led, or digital marketplace distribution. H/Advisors ranked #3 globally by deal count in Mergermarket's 2025 M&A PR Advisor League Tables, advising on 308 transactions worth $219B in aggregate deal value, and holds #1 ranking in France, #2 in Europe, #3 in UK by deal value, and #4 in US by deal count.

H/Advisors is not a technology company. It has no proprietary software platform, no published APIs or SDKs, no patents, and no AI/ML research output. Its 'Data, Digital & Creative Strategy' practice leverages third-party AI tools and data analytics for content, social, and reputation work, but technology is a delivery enabler rather than a productized offering. Recent strategic activity has been acquisitive and geographic: the firm acquired Acento Public Affairs in February 2026 and Format Agency in May 2026, launched a Warsaw office in June 2026, expanded its Brussels Public Affairs hub in May 2026, and appointed a permanent US CEO in June 2026.

Name

H Advisors

Legal name

H Advisors Limited

Website

https://h-advisors.global

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

H/Advisors is a global strategic communications and advisory consultancy (subsidiary of Havas Group/Vivendi) serving boards, executives, and governments across M&A, crisis, investor relations, and public affairs. With 1,500+ experts in 40+ offices, it ranks #3 globally in M&A PR advisory.

Ownership category

akta.pro rank

Product category

Strategic Communications Advisory

NAICS

Other Management Consulting Services (541618), Administrative Management and General Management Consulting Services (541611), Portfolio Management and Investment Advice (523940)

SIC

Services-Management Consulting Services (8742), Investment Advice (6282)

akta.pro primary industry

Corporate Finance & Capital Advisory (BPAHADAB)

Keywords

• Strategic communications advisory
• Corporate reputation management
• M&A communications advisory
• Public affairs consulting
• Crisis management services

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices27 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure, Others

Revenue model

1. Strategic Communications Advisory: H/Advisors generates revenue through fees for professional advisory services including corporate communications, crisis and reputation management, investor relations, M&A advisory, public affairs, litigation support, sustainability/ESG, and transformation consulting. Revenue is derived from project fees, retainers, and transaction-based mandates. The firm is part of Havas, one of the world's largest communications groups.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

H/Advisors is a global strategic communications advisory firm that helps organisations address complex challenges and strategic shifts through nine core practice areas: Corporate Communications, Crisis & Reputation Management, Data/Digital & Creative Strategy, Investor Relations & Financial Communications, Litigation Advisory, M&A & Shareholder Activism, Public Affairs & Policy Advisory, Sustainability & ESG, and Transformation & Change. The firm delivers senior-level advisory, deal communications, crisis response, public affairs campaigns, and stakeholder engagement on a project, retainer, or transaction-linked basis.

Product overview

H/Advisors is a global strategic communications advisory network operating as part of Havas. The firm offers a comprehensive suite of advisory services organized into nine core practice areas: Corporate Communications, Crisis & Reputation Management, Data/Digital & Creative Strategy, Investor Relations & Financial Communications, Litigation Advisory, M&A & Shareholder Activism, Public Affairs & Policy Advisory, Sustainability & ESG, and Transformation & Change. Additionally, the firm produces proprietary research including the 'Leading without a landing' global leadership study and 'H/ORIZONTES' report on Spain's public agenda. The network also includes the 'Behind The Narrative' podcast. Through recent acquisitions, H/Advisors has integrated Format Agency (corporate influence communications) and Acento Public Affairs (Spain's leading public affairs consultancy). With 40+ offices across 20+ countries and 1,500+ experts, the firm provides localized strategic counsel backed by global expertise.

Differentiator

Problem solved

Functional benefit

Products and services

• Corporate Communications
• Crisis & Reputation Management Rapid crisis response, cybersecurity preparedness, and reputation protection strategies that mitigate risk and ensure resilience for organisations facing high-stakes reputational threats.
• Data, Digital & Creative Strategy Social, digital, and AI-driven strategies that leverage data insights to enhance reputation and brand storytelling for organisations.
• Investor Relations & Financial Communications Market-moving financial narratives, investor engagement, and governance strategies that build confidence and enhance corporate value for IPOs, M&A, and ongoing IR.
• Litigation Advisory Supporting organisations on legal matters, regulatory investigations, and crisis litigation to safeguard reputation throughout contentious proceedings.
• M&A & Shareholder Activism Strategic communications for M&A, activist engagement, and regulatory positioning ensuring deal announcements, integrations, and activism defense drive stakeholder confidence.
• Public Affairs & Policy Advisory Global regulatory expertise, legislative engagement, and political risk assessment to shape policy and drive advocacy for governments, institutions, and corporations.
• Sustainability & ESG Strategic sustainability messaging, ESG reporting, and stakeholder engagement that align with regulatory expectations and corporate responsibility goals.
• Transformation & Change Leadership positioning, employee engagement, and internal communications and change strategies that drive alignment and cultural integration during organisational transformation.

Quantifiable outcome

• H/Advisors ranked #3 globally by deal count in Mergermarket's 2025 PR Advisor League Tables, advising on over 300 M&A transactions, a near 10% increase from 2024.
• +3 more outcomes

Named customers30 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Twelve partnerships are on record, tiered strategic, core and minor.

• Format AgencystrategicStrategic or Co-development Partner · 19 May 2026Havas Paris led the acquisition of Format, a next-generation corporate influence communications company founded in 2021 by Thomas Khaski. Format operates in media relations, social media, content creators, and content production. Format's teams join H/Advisors, gaining access to international clients through H/Advisors' network in 20+ countries. Format retains its name, organizational structure, and autonomous operations under Khaski's leadership.
• H/Advisors GaulystrategicStrategic or Co-development Partner · 5 May 2026H/Advisors Gauly's Brussels public affairs operations were unified with H/Advisors Acento and the existing Brussels office to create a market-leading, multi-disciplinary EU Public Affairs hub. Led by Maria Lledo (Executive Chairwoman) and Vanessa Haumberger (Chief Strategy Officer).
• Acento Public AffairsstrategicStrategic or Co-development Partner · 2 February 2026Havas acquired a majority stake in Acento Public Affairs, Spain's leading public affairs consultancy founded in 2019, with offices in Madrid, Barcelona, and Brussels. Acento was immediately integrated into H/Advisors and rebranded under the H/Advisors name while retaining its co-CEO leadership structure. The acquisition positions H/Advisors as the clear leader in strategic advisory communications across Iberia.
• HavascoreOthersH/Advisors is fully owned by Havas, one of the world's largest communications groups. As part of Havas, H/Advisors combines deep local expertise with global reach, accessing strategic counsel, creative thinking, and best-in-class execution across markets. This partnership enables H/Advisors to offer clients access to Havas' creative, media, and digital capabilities alongside its strategic advisory services.
• Deekeling ArndtminorOthersDeekeling Arndt is a strategic communications consultancy operating within the H/Advisors network, particularly in Germany (Düsseldorf, Berlin). Led by Olaf Arndt (CEO & Senior Partner) and Bernd Buschhausen (Managing Director). The firm advises DAX 40 companies, large medium-sized companies, family businesses, and associations.
• H/Advisors KlarecominorOthersH/Advisors Klareco is the Asia-Pacific arm of the H/Advisors network, led by Shih-Huei Ang (CEO) in Singapore. Specializes in government relations, public affairs, corporate reputation, crisis management, and financial communications.
• APA (Australian Public Affairs)minorOthersAPA (Australian Public Affairs) became part of H/Advisors in 2023. Founded by Tracey Cain, APA specializes in reputation and crisis management, particularly in private education, legal disputes, litigation, health, and aged care.
• Ashton ConsultingminorOthersAshton Consulting is a Tokyo-based firm within the H/Advisors network, led by Dan Underwood, CEO. Specializes in activist investor advisory and M&A communications in Japan and Asia-Pacific.
• Havas Village WarsawminorOthersH/Advisors Poland is based within Havas Village Warsaw, leveraging integration with Havas' creative, media, and digital capabilities. The Warsaw office combines strategic advisory with full-scale communications execution.
• 40dBminorStrategic or Co-development PartnerH/Advisors collaborated with 40dB, a research organization, to produce the H/ORIZONTES report on Spain's public agenda (April 2026). The report was based on a survey of 2,000 people examining concerns, beliefs, and behaviors shaping Spain's public agenda.
• Ian King (Host)minorOthersRenowned UK business journalist Ian King co-hosts the 'Behind The Narrative' podcast alongside H/Advisors Partner Katharine Spence. The podcast features prominent business leaders and people of influence.
• Blanquerna Center for Global CommunicationminorStrategic or Co-development PartnerJavier Curtichs is Co-founder and active partner in the Blanquerna Center for Global Communication in Barcelona, a joint venture with Emerson College in Boston. Focuses on communication management research and education.

Scale indicators11 records

Recent moves9 records

Expansion highlights6 records

Market position

Strengths4 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/h-advisors

Revenue estimate

Valuation estimate

Number of profiles

Profiles15 records

Subsidiaries3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about H Advisors