According to the Estonian Accounting Act amendment the annual report can be signed by one member of the management board only. 

Confirming of the annual report is done by the decision of management as a collective organ, the form of final approval is not provided by the legislator.  
According to the law, at least one management board member has to sign the annual report but it is not prevented that it cannot be signed by several or all members of the management board when company`s articles of association or other documents define so.