Generally, shareholders (ie members) have a right to transfer or sell their shares to whomever they want. However, certain provisions in a company’s Articles of association may restrict this right where there is:
a provision that the board of directors should have the power to refuse the register of shares, or
a pre-emption clause which obligates a member to first offer to sell their shares to other specified members or directors
In these cases, you should check your articles of association or Ask a lawyer if you require assistance in reviewing your documents.