The SH01 form, also known as the "Return of Allotment of Shares", refers to the form that is used to notify Companies House of an allotment of shares by a company. When your company issues new shares, it must complete and file this form with Companies House within one month of the allotment date. The form provides details about the company, the new shares being issued, and the shareholders who will receive them. It is a legal requirement under the Companies Act 2006 for all businesses registered in the UK to file this form with Companies House.