Beta This part of GOV.UK is being rebuilt – find out what beta means

HMRC internal manual

Capital Gains Manual

Definitions: quoted and unquoted shares and securities: Interactive Data (formerly Extel)

If you use Interactive Data to identify quoted shares and securities be careful of three points.

  • Interactive Data includes AIM (Alternative Investment Market) shares. These are easily identified by the initials after the description of the shares. They are not quoted shares, see CG50255.
  • If a valuation is required check that the shares were quoted at the date you want the value. Interactive Data gives details of the share history.
  • Again, if a valuation is required check the status of the shares the taxpayer actually held at the date of valuation.


At 31 March 1982 an individual owned shares in an unquoted company. In 1986 the unquoted company is taken over by a quoted company which issued its own shares in exchange for the unquoted shares. The individual sells the shares in the quoted company. If you look up the quoted company’s shares using Interactive Data, this will give you a 31 March 1982 value for the shares in the quoted company. But the 31 March 1982 valuation you actually need is of the shares in the unquoted company. For further instructions on this point see CG50917.