off-floor trading; after-hours trading; premarket trading
Stock market term for trading that occurs outside regular exchange hours or off the trading floor. Covers both premarket and after-hours sessions.
Off-floor trading is conducted outside regular trading hours.
この銘柄は立会外取引で大きく値上がりした。
This stock rose sharply in after-hours trading.
Refers to trading during regular exchange hours, as opposed to 立会外取引 which occurs outside those hours.
Compound of 立会 (たちあい, 'session' or 'presence') + 外 (がい, 'outside') + 取引 (とりひき, 'trading'). Literally 'trading outside the session'.