The monarch of New Zealand is the Sovereign Head of the order and those who are appointed as members are "Companions". Companions are classified into Ordinary, Extra, Additional, and Honorary members. Ordinary Companions are those being New Zealand citizens or citizens of Commonwealth realms. Ordinary membership is limited to 50 appointments per annum. Members of the Royal Family can be named "Extra Companions". Those citizens of countries not sharing the monarch of New Zealand as their head of state may be appointed as "Honorary Companions". "Additional Companions" may be appointed in honour of important royal, state or national occasions.