What OSK does

OSK is an Irish audit, tax, and business advisory firm headquartered in Dublin (East Point Plaza, Dublin 3) and operating since 1985. The firm serves Irish SMEs, multi-national groups with Irish operations, government bodies, sole traders, and contractors, with stated specialist depth in sporting organisations, property and construction, occupational pension schemes, hospitality, financial services, and contracting. It offers eight branded service lines — Audit, Tax, Business Advisory, Company Secretarial, Contracting, Corporate Finance, International, and Small Business Support — delivered through a partner-led model with a dedicated director assigned per client.

Revenue mechanics are traditional professional-services fees: engagements are quote-based, contracts are typically multi-year, and pricing is not publicly disclosed. Distribution is direct from the Dublin headquarters via phone, email, website contact forms, and professional-network referrals; the firm maintains no resellers, marketplaces, or international offices beyond an affiliation with the CPAAI cross-border taxation network. Go-to-market combines inbound content (blog, ezine, tax summary cards, sector fact sheets) with partner-led sales and referrals, and includes an active graduate recruitment programme supported by ACCA Platinum Approved Employer status and Chartered Accountants Ireland membership. The only formal partnership of strategic significance is the role as Official Audit and Accounting Partner of the Federation of Irish Sport, renewed into 2025.

The underlying technology stack is standard professional-services tooling, with Microsoft Azure referenced for data storage and no proprietary product, API, or data platform disclosed. There are no AI/ML capabilities stated, no integrated software product, and no patents; the firm competes on people, sector expertise, and relationship quality rather than technology differentiation. Ownership is private and internally held by partners and directors, with no parent company, subsidiaries, or external institutional investors identified.

Name

OSK

Legal name

OSK

Website

https://osk.ie

Company type

Private

Founded year

1985

Operating status

Operating

Headcount range

51–100 employees

Short description

OSK is an Irish audit, tax, and business advisory firm based in Dublin, founded in 1985. It serves SMEs, multi-nationals, government bodies, sole traders, and contractors across sport, property, pensions, hospitality, and financial services via partner-led, quote-based engagements.

Ownership category

akta.pro rank

Headquarters

HQ city

Dublin

HQ country

Ireland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Audit Services: Statutory audits, compliance audits, and audit-exempt services for companies of various sizes.
2. Tax Advisory Services: Tax planning, compliance, and advisory including personal tax, corporate tax, international tax, and VAT.
3. Business Advisory: Management accounting, bookkeeping, payroll services, budgeting and forecasting.
4. Corporate Finance: M&A advisory, business valuations, and financial restructuring.
5. Company Secretarial: Compliance and governance services for Irish companies.
6. Contracting Services: Accounting and tax services specifically for contractors and freelancers.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

OSK is an Irish audit and accounting firm providing statutory audit, tax advisory and compliance, business advisory (bookkeeping, payroll, management accounting, budgeting), corporate finance (M&A advisory, valuations, restructuring), company secretarial, specialist contractor accounting, and international tax services. The firm serves SMEs, multi-national groups, government bodies, sole traders, and sector-specific clients across sport, property, pensions, hospitality, and financial services.

Product overview

OSK is a professional accounting and business advisory firm offering a comprehensive suite of services. The core offerings include OSK Audit, OSK Tax, OSK Business Advisory, OSK Company Secretarial, OSK Contracting, OSK Corporate Finance, OSK International, and OSK Small Business Support. OSK Business Advisory encompasses specific sub-services such as Management Accounting Services & Bookkeeping, Payroll Software, and Budgeting & Forecasting. The firm operates as a traditional professional services practice rather than a software product platform.

Differentiator

Problem solved

Functional benefit

Brands

• OSK Audit: Audit services
• OSK Business Advisory
• OSK Company Secretarial
• OSK Contracting
• OSK Corporate Finance
• OSK International
• OSK Small Business Support
• OSK Tax

Products and services

• OSK Audit Statutory audit, compliance audit, and audit-exempt services for Irish SMEs, multi-national groups, government bodies, and sole traders.
• OSK Tax Tax advisory, planning, and compliance services including tax return preparation, tax deadlines management, and BIK table calculations for Irish businesses and individuals.
• OSK Business Advisory Business advisory services encompassing management accounting, bookkeeping, payroll software, budgeting, and forecasting for Irish SMEs.
• OSK Company Secretarial Company secretarial services ensuring compliance with statutory requirements and corporate governance for Irish companies.
• OSK Contracting Accounting and tax services specifically designed for contractors and freelancers, including payroll management, compliance, and contractor-specific tax planning.
• OSK Corporate Finance Corporate finance advisory services including financial planning, business valuation, M&A advisory, and transaction support for Irish businesses.
• OSK International International business advisory services including guidance on setting up businesses in Ireland and cross-border taxation for multi-national groups and foreign businesses entering Ireland.
• OSK Small Business Support Comprehensive accounting and advisory support tailored for small and medium-sized enterprises, including estate planning and trust tax issues.

Named customers6 records

Segments10 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Three partnerships are on record, tiered core and minor.

• Federation of Irish Sport (FIS)coreStrategic or Co-development Partner · 15 January 2025OSK is the official Audit and Accounting partner of the Federation of Irish Sport and preferred supplier of these services to the Federation's members. This partnership provides member organisations with access to tailored audit and accountancy services, ensuring operations align with best practices and regulatory standards. OSK has a long history of supporting clients in the Sport sector in Ireland.
• CPAAI (CPAAI Cross Border Taxation Service)minorStrategic or Co-development Partner · 1 August 2018OSK announced launch of CPAAI Cross Border Taxation Service, expanding international tax capabilities through the CPAAI global network of accounting firms.
• ACCA (Association of Chartered Certified Accountants)coreStrategic or Co-development PartnerACCA Platinum Approved Employer Status for trainee development - the highest standard awarded to training practices. Both ACA and ACCA Approved Employer Monitoring have conducted review visits.

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Mazars Ireland: Irish mid-tier audit, tax and advisory firm with full-service coverage of audit, tax, accounting and corporate finance for Irish SMEs, corporates and multinational subsidiaries – a near-direct peer to OSK in services and segment focus.
• Crowe Ireland: Irish arm of the Crowe Global network providing audit, tax, advisory and risk services to SMEs and mid-market companies in Ireland; directly overlaps OSK's audit, tax and corporate finance offering and target client base.
• RSM Ireland: Irish member of the RSM global network providing audit, tax and consulting to mid-market companies in Ireland; competes with OSK for SME and mid-market audit, tax and cross-border advisory engagements.
• Grant Thornton Ireland: Irish member of a global mid-tier accounting network offering audit, tax, advisory and corporate finance to SMEs and mid-market clients; directly comparable in service breadth and target segments to OSK.
• BDO Ireland: Irish mid-tier audit, tax and advisory firm serving SMEs, multinationals and public-sector clients across similar service lines to OSK; competes head-to-head in the Irish mid-market and is of broadly comparable scale to OSK's Top-20 positioning.
• Baker Tilly Ireland: Irish mid-tier accounting firm offering audit, tax, advisory and corporate finance to Irish SMEs, owner-managed businesses and not-for-profits; comparable size and service mix to OSK with similar domestic focus.
• PKF Ireland: Irish mid-tier accounting firm delivering audit, tax, advisory and corporate finance to owner-managed businesses, SMEs and family enterprises; a comparable Irish mid-market peer with a similar service-line footprint to OSK.

Broad incumbents

• Deloitte Ireland: Big-4 audit, tax, consulting and advisory firm in Ireland serving large multinationals, government bodies and large Irish corporates; an incumbent competitor at the upper end of OSK's multinational and government client segments.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/oskaccountants
• Facebookfacebook.com/OSKAccountants

Revenue estimate

Valuation estimate

Number of profiles

Profiles17 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 OSK