(1) A limited company having a share capital may not alter its share capital except in the following ways.
(a) increase its share capital by allotting new shares in accordance with this Part, or
(b) reduce its share capital in accordance with Chapter 10.
(a) sub-divide or consolidate all or any of its share capital in accordance with section 618, or
(b) reconvert stock into shares in accordance with section 620.
(4) The company may redenominate all or any of its shares in accordance with section 622, and may reduce its share capital in accordance with section 626 in connection with such a redenomination.
(5) Nothing in this section affects -
(a) the power of a company to purchase its own shares, or to redeem shares, in accordance with Part 18;
(b) the power of a company to purchase its own shares in pursuance of an order of the court under -
(i) section 98 (application to court to cancel resolution for re-registration as a private company),
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