Except as provided in subsection (a) of this section, or as otherwise required by law, every share of stock hereafter issued by a registered management company (except a common-law trust of the character described in section
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(c) of this title) shall be a voting stock and have equal voting rights with every other outstanding voting stock: Provided, That this subsection shall not apply to shares issued pursuant to the terms of any warrant or subscription right outstanding on March 15, 1940, or any firm contract entered into before March 15, 1940, to purchase such securities from such company nor to shares issued in accordance with any rules, regulations, or orders which the Commission may make permitting such issue.