Read the share description
Two holdings with the same percentage can involve different rights or restrictions. Identify the classes, documents and relevant agreements before treating them as equivalent. Voting, distributions, transfer conditions and other rights are matters to establish with the appropriate adviser rather than assume from a class label.
Keep the arithmetic separate
Owning 250 of 1,000 issued shares gives a 25% numerical interest in that simple share-count example. It does not establish voting power, distribution entitlement or a particular valuation treatment. Different classes, options and changes in capital can complicate the denominator. The explorer on this site deliberately uses a simplified share-count illustration.
Turn uncertainty into a question list
If you are unsure how the rights work, list the documents and questions for the legal adviser. Then ensure the valuation instructions reflect the position to be assessed. The financial analysis should not silently settle a disputed legal interpretation. Clear instructions are more useful than a percentage presented with false precision.