Is B3 open on Monday 4 May 1998?

Yes

Yes. B3 is open on Monday 4 May 1998, trading from 10:00 to 17:00 GMT-3 (São Paulo time).

10:00–17:00 GMT-3

Regular hours

Related markets on 4 May 1998

NYSE	09:30–16:00
Nasdaq	09:30–16:00
TSX	09:30–16:00
CME Equity	17:00^{−1 previous day}–16:00
LSE	Early May Bank Holiday
Xetra	09:00–17:30
Euronext Paris	09:00–17:30
SIX	09:00–17:30
TSE Tokyo	Citizen's Holiday Golden Week
HKEX	Market holiday