A contract for the purchase or sale of a M.B.S. to be delivered at an agreed-upon future date but does not include a specified pool number and number of pools or precise amount to be delivered .
TO BE ANNOUNCED (T.B.A.)
Meaning of TO BE ANNOUNCED (T.B.A.) in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012