Beneficial ownership may be shared among a group of individuals. If a beneficial owner controls a position of more than 5% it must file Schedule 13D under Section 12 of the Securities Exchange Act of 1934.
Section 13(g) is very similar to Section 13(d). However, the requirements of Section 13(g) are less burdensome because Section 13(g) is designed to require reporting by qualified institutional investors and passive investors which do not raise the types of concerns underlying Section 13(d). Under this section, reporting entities must file Schedule 13G, which is very similar to Schedule 13D but requires less information and, in most cases, must only be updated on an annual basis. Schedule 13G must be filed when a qualified institutional investor exceeds 5% of a class of outstanding registered equity securities provided they hold the securities due to their normal course of business and not to affect change or influence control of the issuer. Schedule 13G is actually combined with Schedule 13D.
An investment advisor registered with either a state or the SEC could be considered a qualified institutional investor and more likely subject to Section 13(g) as opposed to Section 13(d). A passive investor would be a person or entity that trades for its own account and does not fall within the definition of qualified institutional investor, e.g. broker/dealer, investment advisor, or insurance company. Schedule 13G must be filed within 45 days of the end of the calendar year in which the qualified institutional investor exceeds the 5% threshold. Going forward, amendments are required on an annual basis. Amendments are also required within 10 days after the end of a month in which beneficial ownership exceeds 10% or more and within 10 days after the end of a month when ownership increases or decreases by at least 5%.