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The download() returns NaN OHLC (but valid Volume) for the most recent daily bar before the exchange opens #2895
Description
For a Warsaw Stock Exchange (GPW) ticker, yf.download(..., interval="1d") returns the most recent completed trading day with Open/High/Low/Close = NaN while Volume is populated, when the request is made before the local market opens. After the market opens, the same bar is backfilled with correct OHLC values.
Reproducer
Run before the GPW open (~09:00 CEST). Checked at 2026-07-10 08:43 CEST:
>>> import yfinance as yf
>>> yahoo_symbol = 'ATR.WA'
>>> hist = yf.download(yahoo_symbol, period="5d", interval="1d", progress=False, auto_adjust=True)
>>> print(f"Recent quotes: {yahoo_symbol}\n{hist.tail(3).to_string()}")
Recent quotes: ATR.WA
Price Close High Low Open Volume
Ticker ATR.WA ATR.WA ATR.WA ATR.WA ATR.WA
Date
2026-07-07 63.000000 64.000000 61.599998 63.900002 6841
2026-07-08 60.599998 63.599998 58.000000 63.599998 13552
2026-07-09 NaN NaN NaN NaN 6527Note the last bar is dated 2026-07-09 (a fully completed session, the day before the query), not the in-progress current day — so it is not simply a placeholder for "today".
Environment
- yfinance: 1.5.1
- pandas: 3.0.0
- Python: 3.14.0
- Exchange: GPW (Warsaw),
.WAsuffix auto_adjust=True,interval="1d",period="5d"
Additional context
Reproducible across multiple .WA symbols (also observed on AMB.WA) and across consecutive days, always pre-open. Appears to be a data-availability/timing issue where Yahoo has settled the volume for the session but not yet published/backfilled the OHLC prices at the time of the pre-open request.
Activity
ValueRaider commentedon Jul 11, 2026
Did you check what finance.yahoo.com had? Important to identify what is causing problem.
pawelkn commentedon Jul 14, 2026
It looks like Yahoo is missing the most recent day quotes. If so, the issue is not related to yfinance. I'll check other days and other ticker symbols as well, before rejecting the issue.
Checked at 2026-07-14 07:31 CEST:
PKPublicCode commentedon Oct 24, 2026
jFYI. I clearly see that issue highly reproducible 30 mins after US Market extended hours close (UTC 00:30), and not reproducible 90 minutes after (UTC 01:30). So, it looks like for yahoo it takes some time to publish data