A foreign acquirer reviewing a Spanish target for the first time often finds that the process looks familiar on the surface. Spanish corporate structures, deal documentation, and signing ceremonies share much with other European markets. In practice, however, a cluster of jurisdiction-specific rules – covering corporate governance, labour obligations, tax, and regulatory screening – creates material risk for buyers who apply a generic checklist without Spanish-specific adaptation.
M&A due diligence in Spain is a structured legal and commercial review conducted before signing a share purchase agreement or asset deal. It covers corporate, financial, tax, employment, regulatory, and real estate matters. A standard process runs between four and eight weeks and concludes with a due diligence report that directly informs the representations and warranties and closing conditions negotiated in the transaction documents.
This guide sets out the step-by-step procedure for conducting legal due diligence on a Spanish target, identifies the documentary checklist that experienced practitioners rely on. Additionally. Flags the errors that cost foreign acquirers time and money at the most sensitive point of a transaction.
The Spanish corporate environment and why it matters for due diligence
Spanish corporate legislation governs the two dominant target structures a foreign acquirer will encounter. The Sociedad Anónima (SA) – a public limited company – and the Sociedad de Responsabilidad Limitada (SL) – a private limited company – operate under distinct rules on share transfers, shareholder rights, and governance formalities. An SL is by far the more common vehicle for mid-market acquisitions. Its shares are not freely transferable: corporate legislation imposes statutory pre-emption rights, and the target's bylaws frequently add further restrictions. Identifying and waiving those restrictions is a mandatory early step.
All Spanish companies are required to register constitutional and structural changes with the Registro Mercantil (commercial register). The register is publicly accessible and provides certified extracts covering incorporation, share capital, directors, and filed accounts. It is a valuable starting point, but practitioners consistently note that it lags behind actual corporate events. Notarised deeds – executed before a Notario (Spanish notary public) – are legally effective from the moment of execution, not from the date of registration. A buyer relying solely on register extracts therefore misses the current state of title.
Spanish commercial legislation also requires that certain resolutions – including approval of large asset sales and changes to corporate purpose – be adopted by shareholder meeting rather than board action alone. Verifying that past corporate acts were validly authorised is fundamental. The Tribunal Supremo (Supreme Court of Spain) has consistently held that transactions adopted in breach of mandatory shareholder approval requirements may be challenged by dissenting shareholders, creating voidability risk that can survive closing.
For acquisitions in regulated sectors – financial services, energy, telecommunications, healthcare, and defence – the due diligence must map sector-specific licences and regulatory consents before the data room phase begins. Many licences are personal to the corporate entity and do not transfer automatically on a change of control. Identifying these early prevents the deal from reaching an advanced stage only to stall on regulatory approval timelines.
For a comprehensive view of the corporate rules that underpin any Spanish acquisition, our analysis of corporate law matters in Spain provides detailed context on governance, shareholder rights, and statutory obligations.
Step-by-step due diligence procedure and documentary checklist
The due diligence process in Spain follows a sequence that experienced practitioners rarely deviate from. Each step builds on the last, and compressing or skipping steps creates gaps that surface as warranty claims or price adjustment disputes after closing.
Step 1 – Scoping and data room setup (weeks 1–2). The acquirer's legal team prepares a due diligence request list. This list is sent to the seller, who populates a virtual data room. The request list for a Spanish target should always include: certified Registro Mercantil extracts, notarised constitutional documents and bylaw amendments, shareholder register. All shareholders' agreements, minutes of board and shareholder meetings for the preceding three to five years. Additionally, any pledges or encumbrances over shares or assets.
Step 2 – Corporate and title review (weeks 2–3). Counsel verifies the chain of title to the shares being acquired. For an SL target, this means tracing each transfer recorded in the share ledger back to the original issuance. Any gap in the chain – or any transfer effected without a notarised deed where required – creates a defect in title. Pre-emption rights must be confirmed as waived or inapplicable. Authorised but unissued capital and any outstanding conversion rights or options must be identified and quantified.
Step 3 – Contracts and material agreements (weeks 2–4). All material commercial contracts are reviewed for change-of-control clauses. Spanish commercial legislation does not impose a general rule invalidating change-of-control provisions, so each contract must be read individually. Supply agreements, distribution arrangements, and key customer contracts frequently contain explicit consent requirements. Triggering these without counterparty consent can result in automatic termination. The acquirer must decide before signing whether to seek pre-closing consents or accept a warranty and indemnity structure instead.
Step 4 – Employment and labour review (weeks 2–4). Spanish employment legislation is among the most protective in Europe. The due diligence must cover: headcount by category, collective bargaining agreements applicable to the workforce, any pending redundancy proceedings, outstanding labour claims, and the terms of any senior management arrangements. Spanish employment legislation imposes information and consultation obligations on the works council before certain transactions proceed. Failure to observe these obligations does not void a deal, but it creates significant post-closing liability.
Step 5 – Tax review (weeks 3–5). Spanish tax legislation requires a review of the target's filing history, outstanding assessments, and any ongoing tax inspections. Acquisitions structured as share purchases do not trigger transfer tax on the acquisition of the shares themselves in most cases. However. Real-estate-rich companies attract a specific transfer tax under tax legislation provisions targeting economic equivalence with a direct asset transfer. Identifying whether the target qualifies as real-estate-rich is therefore a threshold question for transaction structuring.
Step 6 – Real estate and IP review (weeks 3–5). Where the target owns real property, title searches at the Registro de la Propiedad (property register) are mandatory. Urban planning compliance, outstanding mortgage charges, and lease agreements must all be checked. Intellectual property rights held by the target are verified against the Spanish Patent and Trademark Office records. Any IP created by employees or contractors is reviewed for valid assignment under Spanish intellectual property legislation.
Step 7 – Litigation and regulatory review (weeks 4–6). Pending and threatened litigation is identified from court records, management representations, and correspondence. Spanish civil procedure rules allow parties to obtain certified court records confirming proceedings in the target's name. Outstanding regulatory sanctions, ongoing administrative proceedings, and any sector-specific enforcement actions must be disclosed and quantified as contingent liabilities.
Step 8 – Due diligence report and SPA negotiation (weeks 6–8). Counsel produces a due diligence report summarising findings by risk category – red, amber, and green. Red items typically become either deal-breakers or specific indemnities in the share purchase agreement (SPA). Amber items inform representations and warranties scope and disclosure schedules. Green items require no further action. The SPA's closing conditions, representations and warranties, and indemnity provisions are then negotiated against this factual backdrop.
To explore how the due diligence findings feed into transaction structuring and deal execution, our dedicated service page on M&A transactions in Spain sets out the full advisory process from term sheet to closing.
To receive an expert assessment of your acquisition target in Spain, contact us at info@ferrazwhitmore.com.
Common errors by foreign acquirers and how to avoid them
Foreign buyers in Spain consistently repeat a set of errors that experienced local counsel recognise immediately. Understanding them in advance reduces cost and deal risk considerably.
Relying on register extracts alone. As noted above, the Registro Mercantil reflects filed documents, not the current legal position. A notarised share transfer executed two weeks before the data room opens may not yet appear on the register. Buyers must request the physical share ledger, all notarised deeds, and confirmation from the Notario who last intervened in a share transfer.
Underestimating the labour contingency. Spanish employment legislation makes it difficult and expensive to reduce headcount post-acquisition. Buyers who discover a bloated cost base or pending labour claims only after closing face a material impact on projected returns. The labour due diligence must produce a fully costed headcount model, not merely a list of employee categories.
Missing real-estate-rich company exposure. A significant share of Spanish mid-market targets hold real property directly or through subsidiaries. Buyers who structure these as share purchases without checking the real-estate-richness threshold under tax legislation may face an unexpected transfer tax assessment after closing. The tax due diligence must include a specific asset composition analysis.
Treating representations and warranties as a substitute for due diligence. Some buyers. Particularly those accustomed to warranty and indemnity insurance in other markets, attempt to reduce the scope of due diligence in reliance on SPA representations and warranties. Spanish courts – including the Tribunal Supremo – have held that a buyer who had the opportunity to discover a defect and chose not to investigate may be held to have assumed that risk. This materially affects the enforceability of warranty claims where the buyer's own due diligence was superficial.
Ignoring foreign investment screening. Non-EU acquirers investing in Spanish companies in strategic sectors must obtain prior authorisation under Spanish investment legislation. The screening regime covers a broad range of sectors. Buyers who sign an SPA before obtaining this clearance risk having the transaction suspended or prohibited. The clearance timeline – typically two to three months – must be built into the deal schedule as a closing condition.
Overlooking data protection compliance. Spanish data protection legislation aligns with EU data protection rules but is enforced by a dedicated national authority with an active inspection and sanction programme. A target with a history of non-compliant data processing practices carries a quantifiable regulatory risk. Due diligence must include a review of the target's data processing activities, privacy notices, processor agreements, and any prior enforcement contact.
A cross-border acquirer familiar with the Portuguese market will find structural similarities – both systems derive from civil law tradition and share certain corporate governance concepts. However, the Spanish employment and tax regimes diverge significantly. Our guide to M&A due diligence in Portugal offers a useful comparative reference for acquirers active in both Iberian markets.
Self-assessment checklist and decision framework
Before committing to a full due diligence process on a Spanish target, an acquirer should work through the following framework. The answers determine both the scope of due diligence and the appropriate transaction structure.
Corporate structure questions. Is the target an SA or an SL? Are there existing shareholders' agreements? Have pre-emption rights been triggered or waived in any prior transfer? Are there outstanding options, convertibles, or phantom share arrangements? A "yes" to any of the last three questions expands the corporate due diligence scope materially.
Regulatory threshold questions. Does the target hold sector-specific licences or operate in a regulated industry? Is the acquirer a non-EU entity or controlled by a non-EU entity? Does the target's asset base include critical infrastructure, media, or defence-adjacent activities? A "yes" to any of these requires a parallel regulatory track running alongside the legal due diligence.
Tax structure questions. Does the target hold real property representing a substantial share of its total assets? Are there outstanding tax assessments or open inspection periods? Has the target participated in any intra-group restructuring in the preceding five years? Each "yes" triggers a specific tax due diligence workstream that must be completed before the SPA price mechanics are agreed.
Employment and HR questions. Does the target employ more than a defined threshold of employees covered by a collective bargaining agreement? Are there pending redundancy proceedings, labour tribunal claims, or senior management arrangements with change-of-control triggers? A material "yes" here requires specialist employment counsel and a fully costed post-closing integration plan.
Timeline and cost calibration. A due diligence process in Spain appropriate for a mid-market transaction typically requires between four and eight weeks with a well-resourced data room. Legal fees for the due diligence phase start in the tens of thousands of euros and scale with deal complexity, the number of workstreams, and the quality of the seller's document preparation. Poorly maintained corporate records – a frequent finding in family-owned Spanish businesses – can add two to four weeks to the process and a proportionate increase in cost. Factoring this contingency into the deal timeline from day one prevents unnecessary pressure at closing.
The due diligence findings should produce a direct output for the SPA negotiation: a prioritised list of specific indemnities, escrow provisions, price adjustments, and closing conditions. An acquirer who completes a thorough due diligence process in Spain and then accepts a generic SPA template has extracted only half the value of the exercise. The findings must be contractually anchored.
For a tailored strategy on acquisition due diligence and SPA structuring in Spain, reach out to info@ferrazwhitmore.com.
Frequently asked questions
Q: How long does M&A due diligence typically take in Spain?
A: A standard due diligence process in Spain runs between four and eight weeks, depending on the size of the target and the completeness of the data room. Complex transactions involving regulated sectors or significant real estate holdings may extend to twelve weeks. Incomplete document provision by the seller is the most common cause of delay.
Q: Do foreign acquirers need special regulatory approval to buy a Spanish company?
A: Most acquisitions of Spanish companies by EU-based buyers proceed without specific foreign investment approval. However, investments from non-EU acquirers above defined thresholds in strategic sectors – including defence, critical infrastructure, energy, and media – require prior authorisation from Spanish investment authorities. This screening regime was expanded significantly after 2020 and now applies broadly to non-EU acquirers, so early regulatory mapping is essential.
Q: What is the biggest misconception foreign buyers have about Spanish due diligence?
A: Many foreign buyers assume that a clean Registro Mercantil extract is sufficient evidence of a company's legal standing. In practice, the commercial register reflects only filed documents and often lags weeks or months behind actual corporate events. A thorough review of shareholder agreements, board minutes, and notarised deeds held outside the register is equally important. Engaging a lawyer in Spain with transactional experience is the most reliable way to close this gap.
About Ferraz & Whitmore
Ferraz & Whitmore is an international law firm based in Lisbon, advising business clients across 46 jurisdictions. Our team combines Portuguese civil law expertise with English common law tradition to deliver cross-border legal solutions in M&A due diligence and transaction advisory in Spain and across the Iberian Peninsula. We advise international acquirers, private equity sponsors, and corporate investors on the full transaction cycle – from scoping and due diligence through SPA negotiation and post-closing integration. The firm's M&A practice covers both civil law and common law systems across Europe, the Americas, and Asia, supported by a network of local counsel. Our attorneys have advised on share and asset acquisitions, joint ventures, and cross-border restructurings across multiple European jurisdictions. As an international law firm in Spain and Portugal, Ferraz & Whitmore brings the dual-tradition perspective that Iberian market transactions consistently demand. To discuss how we can support your acquisition process in Spain, contact us at info@ferrazwhitmore.com.
Disclaimer: This publication is provided for informational purposes only and does not constitute legal advice. The information herein should not be relied upon as a substitute for professional legal counsel tailored to your specific circumstances. Ferraz & Whitmore assumes no liability for actions taken or not taken based on the contents of this material. For advice regarding your particular situation, please contact info@ferrazwhitmore.com.