What Holiseum does

Holiseum is a privately held cybersecurity services firm headquartered in Paris, France, founded in 2018. The firm provides a focused portfolio of cybersecurity services organized around four practice areas: consulting, auditing, training, and investigating. These offerings position Holiseum as an external security advisor and assurance provider rather than a software product vendor, targeting organizations that require specialized cybersecurity expertise they do not maintain in-house. The firm operates on a for-profit basis and maintains a corporate web presence at holiseum.com.

The service portfolio is delivered through human-led engagements and does not, on the basis of available data, include proprietary technology platforms, managed security services, or software products. There is no documented evidence of a productized technology stack, recurring managed-service offerings, or in-house security operations center infrastructure attributable to Holiseum. The firm's delivery model is consistent with a boutique professional services structure in which engagements are scoped around client-specific advisory, compliance, and investigative work.

Holiseum is a small firm with 11-50 employees, operating as a private company with no public listing. No pricing model, customer composition, revenue mechanics, geographic footprint beyond the Paris headquarters, or funding history is documented in the available data. The data inputs provided in this aggregation primarily concern a different, unrelated cybersecurity services firm (Integrity360) and do not transfer to Holiseum. As a result, the depth of operational and financial detail available for analytical purposes is materially constrained.

Name

Holiseum

Legal name

Integrity360

Website

https://holiseum.com

Company type

Private

Founded year

2005

Operating status

Operating

Headcount range

11–50 employees

Short description

Holiseum is a Paris-based private cybersecurity services firm founded in 2018, offering consulting, auditing, training, and investigation services to organizations requiring external security expertise. The firm employs 11-50 people.

Ownership category

akta.pro rank

Product category

Cybersecurity Services

NAICS

Management, Scientific, and Technical Consulting Services (5416), Computer Systems Design and Related Services (54151)

SIC

Services-Management Consulting Services (8742), Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Governance, Risk & Compliance (GRC) Advisory & Assessments (BPAKAHAH)

Keywords

• Cybersecurity consulting
• Security auditing
• Security training
• Security investigations
• Cyber risk advisory

Headquarters

HQ city

Paris

HQ country

France

HQ region

Europe

Offices11 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Managed Cyber Services: Recurring subscription-based managed security services including 24/7 monitoring, threat detection, incident response, vulnerability management, and compliance services. Delivered through six global SOCs.
2. Professional Services: Consulting and implementation services including technical consulting, architectural design, project management, and resource augmentation. One-time or project-based engagements.
3. Cybersecurity Testing: Penetration testing, cloud security testing, application security testing, red team exercises, and social engineering assessments. Typically project-based engagements.
4. Governance Risk & Compliance: Compliance consulting services including GDPR, NIS2, DORA, ISO 27001, PCI DSS, and NIST framework assessments and implementation support.
5. Incident Response: Emergency incident response, digital forensics, compromise assessments, and incident response retainers for organizations experiencing or preparing for security breaches.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels6 records

Core offering

Holiseum offers a comprehensive range of cybersecurity services, including consulting, auditing, training, and investigating. The firm is a boutique Paris-based provider focused on helping organizations strengthen their security posture through professional advisory and assessment engagements.

Product overview

Integrity360 is a cybersecurity services company operating across Europe and Africa, offering a comprehensive portfolio of managed cyber services, professional services, and specialized compliance solutions. The core offering consists of Managed Cyber Services delivering 24/7 capabilities including Threat Exposure Management (CTEM), Managed Detection & Response (CyberFire MDR, AEGIS MDR, Darktrace dSOC), Managed XDR/EDR/NDR, Vulnerability Management, SSE/SASE, and SIEM. Supporting services include Incident Response (emergency response, digital forensics, compromise assessment), Cybersecurity Testing (penetration testing, red team exercises, cloud/application security testing, social engineering), Governance Risk & Compliance (AI Services, DORA, NIS2, GDPR, ISO 27001, Third Party Risk Management), Payments Compliance (PCI DSS and related standards), Operational Technology Security, and Professional Services (technical consulting, resource augmentation). The company operates six Security Operations Centres in Dublin, Sofia, Stockholm, Rome, Madrid, and Cape Town providing round-the-clock protection.

Differentiator

Problem solved

Functional benefit

Products and services

• Cybersecurity Consulting Advisory service where Holiseum consults with organizations on cybersecurity strategy, controls, and risk posture. Targeted at companies that need external expertise to design or improve their security program.
• Cybersecurity Auditing Independent auditing service to evaluate an organization's security controls against internal policies, industry frameworks, or regulatory requirements. Delivered to clients seeking third-party validation of their security posture.
• Security Training Training service for security awareness and skill development for client staff. Designed to improve organizational security capability by educating employees and technical teams on cybersecurity topics.
• Security Investigations Investigation service for organizations responding to, or seeking to understand, suspected cyber incidents. Supports clients needing post-incident analysis, root-cause determination, or evidence gathering.

Quantifiable outcome

• 87% of intrusions now span multiple attack surfaces

Segments8 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability1 record

Feature6 records

Partnerships

Four partnerships are on record, tiered minor and core.

• RedshiftminorOthers · 1 December 2025South African cybersecurity firm acquired by Integrity360 as part of regional growth strategy to expand presence in South Africa. Redshift becomes part of Integrity360's African operations.
• DarktracecoreTechnology or IntegrationStrategic partnership to deliver Managed Darktrace SOC (dSOC) service, combining Darktrace's AI-powered cybersecurity technology with Integrity360's managed services expertise and global SOC infrastructure.
• Venari SecurityminorStrategic or Co-development PartnerPartnership to help organizations prepare for the quantum era through collaborative security solutions addressing emerging quantum computing threats.
• Advantus360coreOthersLeading Canadian cybersecurity services provider acquired by Integrity360 to establish first hub in North America, expanding geographic footprint across the Atlantic.

Scale indicators3 records

Direct peers

• Advens: French cybersecurity services firm specializing in managed detection and response, GRC, and security consulting. One of Holiseum's closest direct competitors in the French mid-market, with a similar boutique positioning.
• Wavestone: Paris-headquartered consulting firm with a strong cybersecurity and digital trust practice covering GRC, cyber resilience, and security transformation. Comparable in geography and service mix, but at meaningfully larger scale.
• Devoteam (Cyber): European technology consultancy with a dedicated cybersecurity practice offering managed services, GRC, and cloud security across multiple EU countries. Closely comparable to Holiseum in size, geography, and service mix.
• Integrity360: Ireland-headquartered pan-European cybersecurity services firm offering managed cyber services, GRC, incident response, and payments compliance across 6 SOCs. Direct peer to Holiseum in the European cybersecurity services market, but at materially greater scale (11+ offices, multiple acquisitions).

Emerging players

• Stormshield: European cybersecurity vendor (subsidiary of Arkema/Cassidian lineage) offering endpoint, network, and data security products plus related services. Adjacent rather than direct, but a French-rooted comparable cybersecurity player operating in the same buyer base.

Broad incumbents

• Atos Cybersecurity: Major European IT services group offering managed security, GRC, and security operations services. Competes with Holiseum for mid-market and large enterprise cybersecurity consulting engagements in France and across the EU.
• Thales (Cybersecurity): French-headquartered global technology group with a sizable cybersecurity division covering consulting, managed services, encryption, and identity. A natural competitor and potential acquirer of Paris-based cybersecurity boutiques.
• Capgemini (Cybersecurity Services): Global IT services firm with a large cybersecurity practice covering advisory, GRC, identity, and managed security. Competes with Holiseum for large French and European enterprise GRC and security transformation engagements.
• Sopra Steria Cybersecurity: European IT services group with a cybersecurity practice offering managed security, GRC advisory, and identity services. Competes with Holiseum for French and EU public sector and enterprise cybersecurity work.
• Orange Cyberdefense: The cybersecurity arm of Orange, providing managed security services, consulting, threat intelligence, and incident response across Europe and globally. Broad incumbent that competes with boutique French firms like Holiseum on enterprise GRC and managed services RFPs.

Market position

Strengths4 records

Weaknesses4 records

Key risks4 records

Key highlights3 records

Customer concentration

• Xx.com/Holiseum
• YouTubeyoutube.com/@integrity360.
• LinkedInlinkedin.com/company/integrity360
• Facebookfacebook.com/Holiseum

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries2 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 Holiseum