H Advisors
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.
- Company typePrivate
- Founded2001
- HeadquartersLondon, United Kingdom
- Headcount1,001–5,000
- GTM typeB2B
- OfferingServices
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.
H Advisors firmographics
Firmographics- 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
H Advisors industry classification
Industry- 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
Where H Advisors is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Offices27 records
Markets served
H Advisors business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure, Others
Revenue model
- 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
H Advisors product offering
Product offeringCore 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
Companies that use H Advisors
Customer profileNamed customers30 records
Segments5 records
Ideal customer profiles4 records
H Advisors technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
H Advisors partnerships and signals
Strategic signalPartnerships
Twelve partnerships are on record, tiered strategic, core and minor.
- Format AgencystrategicHavas 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 GaulystrategicH/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 AffairsstrategicHavas 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.
- HavascoreH/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 ArndtminorDeekeling 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 KlarecominorH/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)minorAPA (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 ConsultingminorAshton 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 WarsawminorH/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.
- 40dBminorH/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)minorRenowned 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 CommunicationminorJavier 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
H Advisors competitors and assessment
Company assessmentMarket position
Strengths4 records
Competitive moat4 records
Key risks5 records
Key highlights7 records
Customer concentration
H Advisors social profiles
Digital presenceH Advisors financial estimates
Financial estimateRevenue estimate
Valuation estimate
H Advisors leadership team
Management profileNumber of profiles
Profiles15 records
H Advisors subsidiaries and ownership
Company hierarchySubsidiaries3 records
H Advisors funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
H Advisors M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about H Advisors
What does H Advisors do?
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.
Is H Advisors a public or private company?
H Advisors is a private company. It is classified as corporate owned and is currently operating.
When was H Advisors founded?
H Advisors was founded in 2001. It employs 1,001 to 5,000 people.
Where is H Advisors based?
H Advisors is headquartered in London, United Kingdom, in the Europe region.
How does H Advisors make money?
One revenue line is on record: strategic Communications Advisory.
Does H Advisors have an API?
No public API is recorded for H Advisors.
What industry is H Advisors in?
H Advisors's product category is Strategic Communications Advisory. Its primary akta.pro industry code is BPAHADAB, Corporate Finance & Capital Advisory. Its NAICS code is 541618 and its SIC code is 8742.