US 401k Retirement Funds - Dividends Received

Hello, for US retirement funds such as a 401k, should the dividends that have been received and reinvested back into the retirement fund be reported in my UK tax filing. Please note that no distributions from these retirement funds have been made. I know when distributions are made, this will need to be reported.

Hi,
No, it is only when you withdaw a lump sum or commence regular payment would there be a tax liability.
Thank you.