The percentages of voting securities and other securities specified in section 310(b) of the Act shall be calculated in accordance with the following provisions:
(a) A specified percentage of the voting securities of a person means such amount of the outstanding voting securities of such person as entitles the holder or holders thereof to cast such specified percentage of the aggregate votes which the holders of all the outstanding voting securities of such person are entitled to cast in the direction or management of the affairs of such person.
(b) A specified percentage of a class of securities of a person means such percentage of the aggregate amount of securities of the class outstanding.
(c) The term amount, when used in regard to securities, means the principal amount if relating to evidences of indebtedness, the number of shares if relating to capital shares, and the number of units if relating to any other kind of security.
(d) The term outstanding means issued and not held by or for the account of the issuer. The following securities shall not be deemed outstanding within the meaning of this definition:
(1) Securities of an issuer held in a sinking fund relating to securities of the issuer of the same class;
(2) Securities of an issuer held in a sinking fund relating to another class of securities of the issuer, if the obligation evidenced by such other class of securities is not in default as to principal or interest or otherwise;
(3) Securities pledged by the issuer thereof as security for an obligation of the issuer not in default as to principal or interest or otherwise;
(4) Securities held in escrow is placed in escrow by the issuer otherwise;
Provided, however, That any voting securities of an issuer shall be deemed outstanding if any person other than the issuer is entitled to exercise the voting rights thereof.
(e) A security shall be deemed to be of the same class as another security if both securities confer upon the holder or holders thereof substantially the same rights and privileges: Provided, however, That, in the case of secured evidences of indebtedness, all of which are issued under a single indenture, differences in the interest rates or maturity dates of various series thereof shall not be deemed sufficient to constitute such series different classes: And, provided further, That, in the case of unsecured evidences of indebtedness, differences in the interest rates or maturity dates thereof shall not be deemed sufficient to constitute them securities of different classes, whether or not they are issued under a single indenture.