(1) In this Act "controller", in relation to an undertaking ("B"), means a person ("A") who falls within any of the cases in subsection (2).
(2) The cases are where A holds -
(a) 10% or more of the shares in B or in a parent undertaking of B ("P");
(b) 10% or more of the voting power in B or P; or
(c) shares or voting power in B or P as a result of which A is able to exercise significant influence over the management of B.
(3) For the purposes of calculations relating to this section, the holding of shares or voting power by a person ("A1") includes any shares or voting power held by another ("A2") if A1 and A2 are acting in concert.
(4) In this section "shares" -
(a) in relation to an undertaking with a share capital, means allotted shares;
(b) in relation to an undertaking with capital but no share capital, means rights to share in the capital of the undertaking;
(c) in relation to an undertaking without capital, means interests -
(i) conferring any right
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