Does this trigger capital gains tax?

Hello, If I were to buy 100 shares of a company for £10,000 and the share price doubled after I bought it - so 100 shares are now worth £20,000. Then I were to sell 50 shares of that company for £10,000 and just hold the other 50 shares, does this trigger capital gains tax? I have only gained back my original cash stake in the company and not profited per se on a cash basis, rather the profits are still held in the asset. Or Would the per share price trigger capital gains tax? So by me selling 50% of my shares I would be taxed on £5000 (I'm disregarding the £3000 tax free allowance for the sake of simplicity). Thanks Tom

Hi,

Yes, as you are only selling half of your shares, you can only claim half the purchase price of £5000.

Thank you.