COMPANIES ACT 1963 - SECT 80 Numbering of shares.
80.—(1) Subject to subsections (2) and (3), each share in a company having a share capital shall be distinguished by its appropriate number.
(2) If at any time all the issued shares in a company, or all the issued shares therein of a particular class, are fully paid up and rank pari passu for all purposes, none of those shares need thereafter have a distinguishing number, so long as it remains fully paid up and ranks pari passu for all purposes with all shares of the same class for the time being issued and fully paid up.
(3) Where new shares are issued by a company on the terms that, within a period not exceeding 12 months, they will rank pari passu for all purposes with all the existing shares, or all the existing shares of a particular class, in the company, neither the new shares nor the corresponding existing shares need have distinguishing numbers so long as all of them are fully paid up and rank pari passu but the share certificates of the new shares shall, if not numbered, be appropriately worded or enfaced.
Ireland - Company Formations & Company Documents
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