Interactive Brokers (IBKR)

Documented trading access

Overnight hours

8:00 PM–3:50 AM ET

Days available

First session Sunday 8:00 PM ET; last session ends Friday 3:50 AM ET

Sunday night

YES

Premarket

4:00 AM–9:30 AM ET (general U.S. extended-hours access; overnight product ends 3:50 AM)

After hours

4:00 PM–8:00 PM ET (general U.S. extended-hours access)

Eligible securities

More than 10,000 U.S.-listed stocks and ETFs

Order types

Limit and Adaptive order types supported; Overnight or Overnight + Day time-in-force

Fractional shares

Not supported (official IBKR course quiz/documentation)

Venue / ATS

IBKR OVERNIGHT destination; IBKR describes dual market centers in current overnight materials

Platform access

TWS, IBKR Desktop/Client Portal, and mobile are documented