Power of Attorney: share sale

Power of attorney for a selling shareholder to appoint the buyer as the seller’s attorney pending registration of the share transfer.

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When do I use this document?

  • as a document to be delivered by a seller at closing of a Share Purchase Agreement
  • when stamp duty is payable on the share transfer
  • to enable the buyer to vote and exercise other share rights pending the registration of the share transfer

What are the key features?

    • suitable for an individual or corporate seller
    • appointment of the buyer as the seller’s attorney
    • grant of authority to the buyer to exercise all rights as the legal owner of the sale shares
    • irrevocable appointment given by way of security

What else do I need to know?

Following the closing of a share sale transaction, the seller will remain the registered owner of the shares which have been sold until the buyer has paid the necessary stamp duty.  This process can take a number of weeks.  The transfer of the sale shares cannot be registered in the register of members of the target company until the stamp duty has been paid.  

The buyer will want to be able to exercise all the rights as the owner of the sale shares notwithstanding that the seller remains the registered legal owner of the sale shares.  To enable the buyer to do this, the buyer will usually require that the seller grants a power of attorney in favour of the buyer which enables the buyer to exercise the legal rights of ownership of the sale shares.

If a share transfer involves consideration exceeding £1,000, stamp duty will be payable to HMRC and HMRC will need to confirm that the stamp duty has been paid.  This stamping process typically takes a few weeks and involves payment of the stamp duty and submission of the stock transfer by email to HMRC for HMRC to confirm the payment.

When do I use this document?

  • for the assignment of IPR by a third party contractor to a company
  • as part of the closing documents in an investment transaction

What are the key features?

  • 8 clauses over 4 pages
  • in the form of a deed between the company and the assigning contractor
  • definitions of Developed IPR and Intellectual Property
  • assignment and further assurance provisions
  • warranties from the assigning contractor as to ownership of the Assigned IPR

What other documents are available?

For a Deed of Assignment of general intellectual property rights by a founder to a company, see

For a Deed of Assignment of registered and unregistered trade marks, see

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Updated by a lawyer on 27/06/2025

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