A vote in favour of more than half of the shares is required (article 199 of the Capital Companies Act). The articles may require a higher majority. For certain changes, unanimity may be needed.
What majority is needed to amend the articles?
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More questions about Modificación de estatutos
Whenever you want to change any clause: corporate purpose, name, registered office, management structure, share transfer rules, financial year, share capital, etc.
Costs depend on the complexity. As a reference: notarial fees (€150-350), Companies Registry inscription (€100-200) and our management fee. Multiple clause changes can be done in a single deed.