In what circumstances may a company accept shares surrendered a member?

In what circumstances may a company accept shares surrendered a member?

ANSWER
As a general rule, surrender of shares is not authorised law. This is a situation wherea member gives up his shares to the company. It is generally not provided for the articles. However, a company may accept such shares in two circumstances:
• To avoid the formalities of forfeiture
• Fully paid up shares may be accepted in return for shares of the same nominal value.