Ticker REGN
From 2015-06-09 00:00:00
To 2015-06-09 00:00:00
Security Type Equity
Market USA
Resolution Daily
Status Waiting Review

REGN is missing data for 2015-06-09.  Verified at daily and hourly resolutions.

qb = QuantBook()
e = qb.AddEquity("REGN").Symbol
df = qb.History(e, datetime(2015,6,8), datetime(2015,6,11), Resolution.Hour)
print(df)