CTM18360 | Shadow ACT: definition of a group: additional tests for parent companies
From HM Revenue & Customs · Company Taxation Manual
SI1999/358 Reg6 (2)(c)
The parent company is to be treated as not being the owner of any share capital, which it owns
directly in a company, if a profit on sale of the shares would be treated as a trading receipt,
indirectly and which is owned directly by a body corporate for which a profit on sale of the shares would be treated as a trading receipt, or
directly or indirectly in a body corporate not resident in the UK.