It is given for nominal value of shares less than Or equal to rs.20000/-... Whether this is independent of total share capital of the company or varies accordingly
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Small Shareholder Director is appointed by small shareholders ( nominal value of shares not more than Rs. 20,000 ) is appointed U/s 151 of the Companies Act 2013.
So the shareholders who in aggregate hold shares of Rs. 20,000 FV / NV of the Share Capital of the Company can appoint SSD.