Castillero Auditores

What Castillero Auditores does

Castillero Auditores S.L.P. is a multidisciplinary audit and advisory firm headquartered in Zaragoza, Spain, operating as a member of PKF Attest (a Top 10 Spanish professional services network founded in 1990 with 950+ professionals across 12 Spanish offices) and Nexia International (a global Top 10 audit and consulting organization present in 100+ countries). The firm delivers statutory and consolidated financial statement audits, tax and legal advisory, operational consulting, corporate finance and M&A support, forensic investigations, insolvency and restructuring administration under Spain's Law 22/2003, mediation, administrative outsourcing, and an internationalization desk for cross-border clients. Its client base is anchored in medium and large Spanish family businesses, with additional focus on corporate groups (including those with cross-border subsidiaries), public sector entities, non-profit organizations, and companies with emerging sustainability reporting obligations under CSRD; geographic reach centers on Aragón with service delivery extending to Madrid, Catalonia, the Basque Country, Andalusia, and Castile-León.

The firm operates on a project-based, quote-driven professional services model with multi-year contractual engagements, particularly for audit and corporate finance mandates. Pricing is not publicly disclosed and is determined by engagement scope and complexity. GTM is direct enterprise relationship-driven: partners and senior staff maintain close contact with clients, and the firm relies heavily on referrals, network channels (PKF Attest, Nexia International), and ongoing multi-year relationships rather than transactional marketing. Marketing channels are modest, including a blog with regulatory updates (CSRD, NIS2, moratoria contable), participation in professional associations (Colegio de Economistas de Aragón, Instituto de Auditores de Cuentas de España), university outreach (Auditor por un Día), and professional conferences. There are no proprietary technology platforms; service delivery rests on partner-led professional judgment. The firm is partner-owned, with no external PE/VC investment disclosed, and operates from a single Zaragoza office relocated in January 2022 to expanded premises.

Name

Castillero Auditores

Legal name

Castillero Auditores S.L.P.

Website

https://castilleroauditores.es

Company type

Private

Founded year

1990

Operating status

Operating

Headcount range

11–50 employees

Short description

Castillero Auditores is a multidisciplinary audit and advisory firm in Zaragoza, Spain, serving medium and large family businesses, corporate groups, and public entities with statutory audit, tax, corporate finance, forensic, and insolvency services through the PKF Attest and Nexia International networks.

Ownership category

akta.pro rank

Headquarters

HQ city

Zaragoza

HQ country

Spain

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Professional Services: Multidisciplinary professional services including auditing and assurance, tax and legal advisory, financial consulting, operational consulting, forensic services, corporate finance, international desk services, mediation, outsourcing, and insolvency proceedings.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels6 records

Core offering

Castillero Auditores is a multidisciplinary audit and advisory firm that delivers financial statement auditing, tax and legal advisory, operational consulting, corporate finance, forensic investigations, insolvency and restructuring, internationalization support, mediation, and administrative outsourcing services. The firm serves primarily medium and large family businesses, corporate groups with domestic and international subsidiaries, public sector entities, and non-profit organizations across Aragón and other Spanish regions.

Product overview

Castillero Auditores S.L.P. is a multidisciplinary professional services firm based in Zaragoza, Spain, offering a comprehensive portfolio of audit and assurance, consulting, and advisory services. The firm's core offering centers on financial statement auditing for companies and public entities, complemented by specialized advisory services including corporate finance, tax and legal advisory, operational consulting, forensic services, insolvency/restructuring, internationalization support, mediation, and administrative outsourcing. The firm operates as part of PKF Attest network (top 10 in Spain) and Nexia International (10th largest global professional services organization), enabling delivery of services across 100+ countries. Services are delivered by multidisciplinary teams of economists, lawyers, and specialists coordinated by experienced directors.

Differentiator

Problem solved

Functional benefit

Products and services

• Auditoría (Audit and Assurance) Comprehensive audit and assurance services including statutory audits of individual and consolidated annual accounts, balance sheet and other financial statement reviews, financial and legality audits for local public sector entities, due diligence, assurance engagements on contractual clauses and financial commitments, annual accounts compilation, and internal accounting control system assessments. Designed for companies, corporate groups, and public sector entities requiring independent verification, enhanced transparency, and stakeholder confidence.
• Consultoría operativa (Operational Consulting) Operational consulting services covering strategic design and implementation, business plan development, treasury budgeting, and cost structure optimization. Targeted at companies seeking to improve operational performance and internal decision-making processes.
• Servicios en el área concursal (Insolvency and Restructuring) Comprehensive advisory services for companies in restructuring or crisis situations, including acting as bankruptcy administrators under Law 22/2003, pre-bankruptcy refinancing agreements, and sale of productive units. Aimed at distressed companies and their stakeholders. The firm has participated as bankruptcy administrators since 2004.
• Finanzas corporativas (Corporate Finance) Corporate finance services including financing advisory, transaction services for M&A processes, and business or unit valuation for disinvestment or expansion strategies. Targeted at companies and investors undertaking financing, M&A, or restructuring transactions.
• Fiscal y legal (Tax and Legal Advisory) Tax and legal advisory services covering tax planning, business taxation, and company formation. Designed for businesses requiring tax optimization and legal structuring support.
• Forensic Independent expert perit services including financial fraud investigations, contract compliance verification, expert reports for judicial proceedings, and collaboration with lawyers in financially complex litigation. Targeted at legal proceedings and corporate fraud investigations.
• International desk Internationalization support services including assistance for foreign companies establishing in Spain and Spanish companies expanding internationally through the Nexia International network (100+ countries). Designed for cross-border companies and inward investors.
• Servicios de mediación (Mediation) Mediation services providing voluntary dispute resolution through neutral professional mediators seeking mutually satisfactory agreements. Targeted at parties in commercial or civil disputes.
• Outsourcing Administrative process outsourcing including accounting services and preparation of financial reports for management and/or parent companies. Designed for companies seeking to delegate back-office finance functions.

Quantifiable outcome

• Maintained activity of three companies through sale of productive units in 2022, preserving 40 jobs
• +1 more outcomes

Named customers7 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Two partnerships are on record, tiered core.

• PKF AttestcoreOthersCastillero Auditores has integrated into PKF Attest, a multidisciplinary professional services firm providing audit, financial consulting, and restructuring/insolvency services. PKF Attest comprises over 950 professionals in 12 offices across Spain (Alicante, Barcelona, Bilbao, Granada, Madrid, Pamplona, San Sebastián, Seville, Valencia, Vitoria, Valladolid, and Zaragoza), ranking in the top 10 of professional services firms in Spain. This integration allows Castillero Auditores to offer services with greater scope and specialization while maintaining their local essence.
• Nexia InternationalcoreOthersCastillero Auditores is a member of Nexia International, the 10th largest worldwide auditing and consulting organization and 7th in Europe, with over 2,700 partners and 15,700 professionals. This membership enables the firm to provide services in over 100 countries worldwide, supporting Spanish companies with international operations and serving foreign subsidiaries established in Spain.

Scale indicators8 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• KPMG Spain: Big 4 audit and advisory firm in Spain serving large corporates, listed companies, and public sector. Competes with Castillero for larger mandates and international group audits, but at substantially greater scale.

Direct peers

• Baker Tilly Spain: International accounting and advisory network with Spanish presence focused on mid-market and family business clients, providing comparable audit, tax, and corporate finance services.
• Grant Thornton Spain: International audit and advisory network with Spanish member firm serving mid-market companies, including family businesses and groups with international operations, similar to Castillero's profile.
• BDO Spain: Top-tier Spanish audit, tax and advisory firm with mid- and large-cap family business focus. Comparable to Castillero in serving Spanish corporate groups with consolidation and cross-border needs.
• PKF Attest: Castillero's parent network in Spain (12 offices, 950+ professionals, Top 10 in Spain). Castillero is an integrated member of this multidisciplinary audit, consulting and insolvency network, making PKF Attest the closest structural peer.
• RSM Spain: Mid-tier global audit and consulting network with Spanish operations serving mid-market and family-owned clients; comparable scale, service mix, and network-driven international coverage.
• Moore Spain (Moore Ibérica de Auditoría): Spanish member of Moore Global, an international audit and advisory network serving SMEs and family businesses with multidisciplinary services, comparable positioning to Castillero within the PKF/Nexia ecosystem.
• Crowe Spain (Crowe Advisory): Spanish audit and advisory firm within the Crowe Global network, serving mid-market and family businesses with audit, tax and consulting offerings; comparable network-affiliated positioning.
• Auren Spain: Spanish multidisciplinary audit, legal and advisory firm providing comparable services to mid-market companies including family businesses; structurally similar to Castillero in service breadth and target client.
• Mazars Spain: Mid-tier international audit and advisory network with established presence in Spain, comparable in multidisciplinary service mix and family/sME client base to Castillero.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/castillero-auditores-slp

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 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 Castillero Auditores