As per Section: 90. Register of significant beneficial owners in a company

Every individual, who acting alone or together, or through one or more persons or trust, including a trust and persons resident outside India, holds beneficial interests, of not less than twenty-five per cent. or such other percentage as may be prescribed, in shares of a company or the right to exercise, or the actual exercising of significant influence or control as defined in clause (27) of section 2, over the company (herein referred to as “significant beneficial owner”), shall make a declaration to the company, specifying the nature of his interest and other particulars, in such manner and within such period of acquisition of the beneficial interest or rights and any change thereof, as may be prescribed:

Concerned: Companies (Significant Beneficial Owners) Amendment Rules

"majority stake" means;- (i) holding more than one-half of the equity share capital in the body corporate; or (ii) holding more than one-half of the voting rights in the body corporate; or (iii) having the right to receive or participate in more than one-half of the distributable dividend or any other distribution by the body corporate;

“significant beneficial owner” in relation to a reporting company means an individual referred to in sub-section (1) of Section 90, who acting alone or together, or through one or more persons or trust, possesses one or more of the following rights or entitlements in such reporting company, namely: (i) holds indirectly, or together with any direct holdings, not less than ten percent, of the shares; (ii) holds indirectly, or together with any direct holdings, not less than ten percent, of the voting rights in the shares; (iii) has right to receive or participate in not less than ten per cent, of the total distributable dividend, or any other distribution, in a financial year through indirect holdings alone, or together with any direct holdings; (iv) has right to exercise, or actually exercises, significant influence or control, in any manner other than through direct-holdings alone:
For the purpose of this clause, an individual shall be considered to hold a right or entitlement indirectly in the reporting company, if he satisfies any of the following criteria, in respect of a member of the reporting company, namely: - (i) where the member of the reporting company is a body corporate (whether incorporated or registered in India or abroad), other than a limited liability partnership, and the individual, (a) holds majority stake in that member; or (b) holds majority stake in the ultimate holding company (whether incorporated or registered in India or abroad) of that member;

BEN-1: Every individual, who subsequently becomes a significant beneficial owner or where his significant beneficial ownership undergoes any change, shall file a declaration in Form No. BEN-1 to the reporting company, within 30 days of acquiring such significant beneficial ownership or any change therein.

BEN-2: Upon receipt of declaration, the reporting company shall file a return in Form No. BEN-2 with the Registrar within a period of thirty days from the date of receipt of such declaration.

How to determine the SBO ?