Problem shareholder in Spanish startups: prevention and exit routes (exclusion, forced transfer and valuation)

A “problem shareholder” is not simply someone who is unpleasant. In a startup or SME, it is any shareholder whose behaviour (or situation) creates measurable corporate risk: decision gridlock, repeated conflict that blocks rounds or transactions, IP or know how leakage, unfair competition, minority or majority abuse, reputational damage, or even enforcement against their stake (attachments and auctions) that may bring in an unwanted third party.

The practical rule is straightforward: design the exit before the conflict. If the exit route is not properly built into the bylaws and/or an enforceable shareholders’ agreement, you typically end up in a forced negotiation, expensive valuation battles, or litigation.

This article provides a clear map for prevention and for executing an exit in Spain, with a focus on SL (Sociedad Limitada), the standard structure for Spanish startups, and with notes for SA where relevant.

1) The three layers that must match (if you want it to work in real life)

In Spain, a reliable solution is rarely a single “button”. It is a combination of three layers that must fit together.

Bylaws (corporate layer): what you want to be enforceable at corporate level (transfer restrictions, determined exclusion grounds, valuation rules, reserved matters and qualified majorities). The key point is that introducing or amending statutory exclusion grounds typically requires full consensus at the time they are adopted. If you did not do it early, it is often impossible later.

Shareholders’ agreement (contractual layer): what best aligns incentives and prevents gridlock (vesting, good/bad leaver, call/put options, drag/tag, deadlock breakers, penalties, escrow, voting commitments).

Execution layer (operational and procedural): board/shareholder resolutions, evidence, notary, Commercial Registry mechanics, buyout funding, and (since 2025) a new practical constraint: for many civil claims you must prove an attempt to use an appropriate dispute resolution mechanism (MASC) as a procedural requirement, with exceptions.

2) Excluding a shareholder in an SL: what the law allows and what usually breaks

In an SL, exclusion is not “because they are difficult”. Spanish law provides legal grounds and also allows additional statutory grounds, but both require proper drafting and procedure.

2.1 Typical legal grounds in an SL

In simple terms, legal exclusion grounds in an SL include scenarios such as:

wilful breach of accessory obligations (prestaciones accesorias),
breach by a shareholder who is also a director of the non-compete duty towards the company,
a final judgment ordering a shareholder-director to indemnify the company for damages to the corporate interest.

The practical takeaway is that “harmful behaviour” needs to be translated into provable facts that fit legal or properly drafted statutory categories.

2.2 Additional statutory grounds: possible, but they must be “determined”

Bylaws may include additional exclusion grounds, but they must be determined (objective, verifiable events) and their adoption/amendment usually requires full consent at the moment they are added. In startups this means: if an investor is already in and the clause was not included, you often cannot add it later.

Typical examples (only if precisely defined and evidenced):

serious and evidenced breach of IP, confidentiality and return-of-materials obligations,
direct competition without authorisation (with clear perimeter and proof),
“key person equity” linkage only if defined as concrete events and a procedure (in practice, leaver mechanics usually work better contractually, with bylaws as support),
attachment/enforcement events that threaten cap table stability, provided the clause is aligned with the forced transfer regime.

Avoid vague wording such as “disloyalty” or “harmful conduct” without objective anchors.

2.3 Procedure and the 25% practical threshold

Exclusion requires a shareholders’ resolution and careful documentation (minutes, grounds, voting record).

A practical threshold matters a lot in SLs: if the affected shareholder holds 25% or more and does not accept the exclusion, the exclusion will often require a final court decision (subject to specific legal exceptions). This makes “fast exclusion” difficult in common cap tables (3 cofounders at 33%, 2 shareholders at 50/50).

If court action is required and the company does not act within the statutory window (often handled as a one-month internal trigger), the shareholders who voted in favour may be able to step in to prevent the resolution from becoming ineffective due to inaction.

3) In an SA: fewer statutory shortcuts, more bylaw design (with limits)

In a Spanish SA, the architecture often relies more on:

bylaw restrictions on registered shares (with strict limits: you cannot make shares practically non-transferable), and
“fair value” acquisition mechanisms with independent expert valuation in statutory scenarios.

This is less common in early-stage startups than SL, but relevant if the structure evolves or if there are more complex corporate vehicles.

4) Attachments and forced transfers: how to avoid an unwanted third party entering

A shareholder can become “problematic” without any internal wrongdoing: their personal debt can lead to attachment and auction of their stake.

4.1 SL: forced transfer regime and acquisition rights

Spanish law provides an SL regime for enforcement/attachment, including notifications, a window to allow substitution/acquisition by existing shareholders (and, if bylaws allow, by the company), and coordination with the enforcement proceeding to protect creditor rights.

If you want to protect the cap table, bylaws should set out clearly:

how early notification works,
who can buy (shareholders, company),
how price is determined (and when “fair value” considerations matter),
how payment/deposit mechanics work without breaking the enforcement process.

4.2 SA: restrictions and fair value purchase

In an SA, transfer restrictions only work within the statutory framework and typically require a “fair value” purchase mechanism with an independent expert in relevant scenarios, including forced transfers by enforcement.

4.3 “Alternative systems” and registry doctrine

Registry practice has accepted certain preventive mechanisms (for example, acquisition rights triggered at early stages of enforcement), provided the clause respects mandatory enforcement rules and third-party rights (the attaching creditor and the buyer at auction). If a clause attempts to remove the creditor’s rights without safeguards, it is likely to be challenged or refused.

5) Contract exits: what tends to work best in startups (because it avoids court-driven exclusion)

For startups, the most effective route is often a well-designed contractual exit. It reduces uncertainty and avoids relying on a court process for exclusion.

A robust setup typically combines:

Vesting with a cliff (if equity is linked to ongoing contribution),
Good leaver / bad leaver with an obligation to transfer,
Call option (company or shareholders buy the bad leaver) and/or put option (the shareholder can force a buyout in defined situations to avoid gridlock),
Deadlock breaker (buy-sell, internal auction, “final offer”, or a structured escalation),
Drag/tag to avoid hostage situations in a sale,
Real enforcement tools (reasonable penalties, documentation escrow, powers to execute transfer if signing is blocked).

As a practical rule, what must be enforceable at corporate level often needs bylaw support (transfer restrictions, forced transfer obligations, valuation framework). Everything else can live contractually.

6) Valuation and payment: where most disputes start

Valuation is the main litigation trigger. Prevention should focus on (1) who values, (2) method, and (3) how payment is funded without harming the business.

6.1 Default rule: independent expert appointed by the Commercial Registry

If there is no agreement on valuation or procedure, Spanish corporate law provides for valuation by an independent expert appointed by the Commercial Registry.

Common practical timing in the statutory framework:

the expert report is issued within two months from appointment,
the buyout/reimbursement is paid within two months after receipt of the report (with deposit mechanisms if timing is exceeded).

The expert’s fees are typically borne by the company, with allocation nuances in exclusion.

6.2 “Fair value” and discounts: where the hard fight happens

In forced internal exits (separation/exclusion), Spanish Supreme Court case law has rejected approaches that punish the departing shareholder simply for being a minority (minority discounts) in contexts where the law aims at real value in an internal compelled transaction.

This does not eliminate methodology debates (DCF, multiples, adjusted NAV), but it makes “punitive discounts” a risky strategy that tends to fuel litigation.

6.3 Statutory formulas: certainty vs under-valuation (especially in startups)

Bylaws can define valuation formulas (for example, last approved balance sheet value) if adopted properly. The advantage is certainty and speed. The risk in startups is clear: if the real value is in intangibles (software, data, brand, pipeline), book value can severely understate reality. In those cases, consider:

hybrid formulas (method plus defined adjustments),
an expert with agreed methodology,
and, when cash is tight, cap/floor with structured payments.

7) Since 2025: MASC before filing a claim (how it changes strategy)

LO 1/2025 introduces, as a general rule, a procedural requirement to attempt an appropriate dispute resolution mechanism (MASC) before filing many civil claims (with exceptions and nuances). For corporate disputes that end up in civil/mercantile courts, this reinforces a strategy that was already good practice: structured negotiation, mediation, or a documented pre-litigation step before court.

8) Prevention checklist (minimum before it hurts)

If you are building the structure (or preparing for a round), this minimum set avoids most problems:

Bylaws: transfer restrictions, enforcement/attachment treatment, key qualified majorities, determined exclusion grounds (if you want them), and a valuation framework or procedure.
Shareholders’ agreement: vesting, leavers, options, deadlock, drag/tag, enforcement.
IP and confidentiality: clear assignment to the company, access control, repositories, operational offboarding.
Payment model: how you fund a buyout without draining the business.

FAQ

Can you expel a shareholder in an SL just because they are “conflictive”?

Not automatically. You need a solid legal basis: a legal ground or a properly drafted determined statutory ground adopted correctly. Otherwise, exclusion becomes fragile and likely ends in litigation.

Why does the 25% threshold matter?

In an SL, if the affected shareholder holds 25% or more and does not accept the exclusion, it often requires a court decision (subject to specific legal exceptions). This makes exclusion a difficult “fast exit” in common cap tables.

What is usually better for startups: exclusion or contract mechanisms?

Contract mechanisms (vesting, leavers, options, deadlock rules) are often more efficient because they reduce uncertainty and avoid relying on court-driven exclusion.

What happens if a shareholder’s stake is attached by creditors?

SL law provides a specific enforcement/attachment regime with notifications and acquisition/substitution possibilities for shareholders (and, if allowed, the company), coordinated with the enforcement process. If you care about this risk, your bylaws must address it precisely.

How is a departing shareholder valued if there is no agreement?

The default route is an independent expert appointed by the Commercial Registry. In the statutory framework, the report is typically issued within two months and payment follows within two months after receipt, subject to deposit rules.

Can you apply a minority discount to the departing shareholder?

In forced internal exits, applying minority discounts as a punishment is legally sensitive. Supreme Court case law has rejected penalising the departing shareholder merely for being a minority. Focus valuation disputes on methodology and assumptions instead.

Is it mandatory to attempt MASC before suing?

Since 2025, as a general rule, many civil claims require an attempt at MASC before filing (with exceptions). In corporate disputes, it should be treated as part of the playbook.