To be , ∨ go , long of the market , To be on the long side of the market Meaning, Definition & Usage

Definitions
  1. etc. (Stock Exchange), to hold stock for a rise in price, or to have a contract under which one can demand stock on or before a certain day at a stipulated price; opposed to short in such phrases as, to be short of stock, to sell short, etc. Cant See Short.

Webster 1913