The instrument upon which traded options are listed.
Underwriting
An arrangement under which a company is guaranteed that an issue of shares will raise a given amount of cash, because the underwriters, for a commission, undertake to subscribe for any of the issue not taken up by the public.
Unit
More than one class of securities trading together as one (eg a stock and a warrant).
Unit trust
A fund which raises money from investors and invests it in a range of securities.
Unlisted securities
Securities that are not listed on an exchange.
Unlisted trading privileges
The trading of securities not listed on a US exchange but traded on that exchange at the request of a member of that exchange, and not at the request of the issuing corporation.
Up tick
A transaction executed at a price greater than the previous transaction.
