A shareholders’ agreement has become an essential tool for regulating relationships between shareholders, preventing conflicts and protecting investment in companies with multiple participants. When properly structured, it allows the parties to establish clear rules on corporate governance, decision-making, financing and exit mechanisms.
When several people decide to undertake a business project together, the initial focus is often placed on operational matters: incorporating the company, financing, business development or client acquisition. However, many of the most complex corporate crises do not arise from the market, but from the absence of clear rules between the shareholders themselves.
In this context, the shareholders’ agreement has become an essential instrument of corporate governance and economic balance between the participants in a company. Far from being a document reserved only for start-ups or large investment transactions, it is now particularly advisable in any business project with multiple shareholders and a long-term perspective.
Its main value lies in its ability to adapt the company’s internal functioning to the specific reality of the business project and the interests of its shareholders, introducing mechanisms to prevent and resolve conflicts.
While bylaws have a more institutional and public dimension, a shareholders’ agreement offers a flexible and confidential framework that is particularly useful for regulating sensitive matters or internal business dynamics. This is all within the principle of freedom of contract set out in Article 1255 of the Spanish Civil Code, under which the parties may establish the agreements, clauses and conditions they deem appropriate, provided they are not contrary to law, morality or public order.
Traditionally, shareholders’ agreements were perceived as instruments designed for crisis or disagreement scenarios. In practice, however, their main function is precisely the opposite: to prevent the conflict from arising in the first place.
Experience shows that many corporate disputes do not arise from bad faith between shareholders, but from different expectations on essential matters: who makes decisions, how growth is financed, what happens if a shareholder wants to exit, or how the value generated by the company is distributed.
For this reason, a good shareholders’ agreement should not be understood as a sign of mistrust, but as an exercise in foresight and professionalisation of the business project.
One of the areas where shareholders’ agreements are most relevant is the definition of the company’s governance rules.
In companies with several shareholders, especially where there are balanced shareholdings or different investor and management profiles, it is essential to properly define the decision-making mechanisms.
The matters typically regulated include:
These provisions coexist with other obligations applicable to company directors. In certain matters, it is therefore useful to consider the framework of obligations and responsibilities of directors under the LSC.
These mechanisms help generate certainty and stability in the management of the company, reducing the risk of corporate deadlock or unilateral decisions contrary to the common interest.
For example, in a company owned 50/50 by two founding shareholders, it may be advisable to establish that certain decisions — such as the sale of essential assets, the entry of new investors or the approval of debt above a certain amount — require the consent of both shareholders.
Similarly, in companies where managing shareholders coexist with purely financial investors, it is common to grant the latter periodic information rights on cash position, budget compliance or business performance.
A shareholders’ agreement is also particularly useful to balance the position of majority and minority shareholders. A minority shareholder may lack sufficient control from a strictly corporate law perspective, but may obtain certain protections through veto rights, enhanced information rights or protections against specific strategic decisions.
In addition to its corporate governance dimension, a shareholders’ agreement performs an essential economic balancing function between the parties.
Every company involves potentially divergent economic interests: shareholders contributing capital versus managing shareholders, financial investors versus industrial partners, or founders with different levels of involvement in the business.
The agreement makes it possible to organise these relationships and establish clear rules on how the company’s economic value is created, protected and distributed.
In this regard, shareholders’ agreements usually include clauses relating to:
These provisions not only provide legal certainty, but also have a direct impact on the economic viability of the project and on the protection of the shareholders’ investment.
A common example arises in start-ups or growth companies that expect future financing rounds. In these cases, the initial shareholders often agree anti-dilution clauses to prevent their stake from being excessively reduced after the entry of new investors. These provisions often become particularly relevant in small market M&A contexts, where the negotiation of economic protections must be aligned with the structure and scale of the transaction.
Similarly, in family-owned businesses or closed companies, it is common to establish pre-emption rights to prevent the entry of third parties unrelated to the project without the consent of the other shareholders.
Exit clauses are particularly important. In many cases, the real conflict does not arise during the ordinary course of business, but when one shareholder wants to leave the project or when a third party enters the company’s capital. Anticipating these scenarios contractually makes it possible to avoid deadlock situations, prolonged disputes or loss of business value. For further context, see our analysis of tag-along and drag-along rights in transactional practice.
This is the case, for example, when a potential buyer makes an offer to acquire 100% of the company and one minority shareholder opposes the transaction. In the absence of mechanisms such as drag-along clauses, the transaction may fail despite being beneficial to most shareholders and to the company itself.
One of the most common mistakes is to rely on standard templates or to reproduce agreements used in other transactions without considering the specific characteristics of the company.
No two corporate structures are identical. The composition of the share capital, the profile of the shareholders, the degree of professionalisation of the company, financing needs and growth horizon necessarily determine the content of the agreement.
A second-generation family business does not require the same design as a technology start-up seeking investment or a joint venture between two companies to develop a specific project.
While in a family-owned business it may be a priority to limit the transfer of shares and regulate succession protocols, in a start-up it is usually more relevant to regulate future capital increases, founder vesting or tag-along and drag-along rights.
For this reason, an effective shareholders’ agreement must be built from a practical and strategic perspective, aligning the economic reality of the business with an appropriate legal structure.
It is equally important to properly coordinate the shareholders’ agreement with the company’s bylaws and the rest of the corporate documentation.
A deficient articulation between these instruments may generate enforceability problems or difficulties in relation to third parties. The design of the agreement must therefore take into account not only the contractual will of the shareholders, but also the statutory architecture of the company and the limits inherent to the relevant corporate form.
Shareholders’ agreements have now become a key component of corporate governance and a fundamental instrument in any joint business project with a long-term and growth-oriented perspective.
When properly structured and tailored to the relevant business, they not only help prevent conflicts, but also professionalise company management, protect shareholders’ investment and ensure an appropriate economic balance between the parties.
Beyond their legal nature, shareholders’ agreements should be understood as strategic tools that provide stability, order and a clear framework for operation and decision-making.
A shareholders’ agreement is a private agreement between shareholders that regulates key aspects of their relationship within the company, such as decision-making, share transfers, financing, exit mechanisms, veto rights and the management of potential conflicts.
Bylaws are public and, once registered with the Commercial Registry, are effective in relation to the company and third parties. A shareholders’ agreement, on the other hand, is a private contract that binds the parties who sign it and allows them to regulate more confidential or strategic matters.
It is advisable to sign it at the beginning of the project or before the entry of new investors, when there is still alignment between the shareholders. It should also be reviewed in financing rounds, changes in the shareholding structure, succession processes or the entry of industrial or financial partners.
This will depend on each project, but shareholders’ agreements usually include rules on corporate governance, reinforced majorities, information rights, share transfers, drag-along, tag-along, pre-emption rights, financing obligations, anti-dilution mechanisms and exit scenarios.
It does not eliminate the risk of conflict entirely, but it makes it possible to anticipate sensitive scenarios and establish clear rules to manage them. Its main value lies in reducing uncertainty and avoiding deadlock situations.
The duration must be analysed carefully. Case law has addressed situations where apparently indefinite agreements may create issues regarding termination or disengagement. You can read more in our analysis of indefinite shareholders’ agreements.
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