Shares are commonly offered as security for a loan. In commercial lending transactions, shares are typically offered as security: • as part of a package of security over the whole of a company's assets (see Practice Note: Key features of debentures) • where the borrower is a special purpose vehicle and the lender wants to have the ability to take control of the borrower and its whole business on enforcement (see Practice Notes: Security in real estate finance transactions, Security in project finance transactions and Taking security in acquisition finance transactions—overview), or • for stamp duty or other tax reasons (see Practice Note: What does stamp duty apply to?) This Practice Note explains the key issues that arise when taking security over shares. In particular, it considers: • the types of shares that may be secured • the relevant types of security used in respect of shares • key terms of the relevant security documents, and • perfection and priority of security over shares This Practice Note focuses primarily on taking security over certificated