retirement by rotation

As per Section 152(6) of the companies act 2013, directors liable to be retire by rotation applicable only to public companies

2/3rd of the directors liable to be retire by rotation and out of 2/3, 1/3 of the Director retire by rotation every year. 

Directors whose tennure will be longest will retire first. These provisions are not applicable to independent and non executive directors and directors appointed by small shareholder.

Check the provision under articles weather there is provision for additional directors for retirement by rotation. But as per section 152(6) of the companies act save as expressely provided the directors who shall be rotated at every agm shall be the directors who are appointed in AGM and additional directors are not included till they are regularized in AGM