An exchange member who executes transactions from the floor of the exchange exclusively for his or her own account. Floor traders used to use the "
open outcry" method in the
pit of a commodity exchange, but now most of them use electronic trading systems. They fulfill an important role in commodity and stock market by risking their own capital to trade futures, options or stocks, thereby providing liquidity and narrowing
bid-ask spreads.
Read more: Floor Trader (FT) Definition | Investopedia
https://www.investopedia.com/terms/f/floortrader.asp
See also:
https://en.wikipedia.org/wiki/Floor_trader
Refer also:
Trading Floor